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Open Access Review

Recent Advances in the Application of Perovskite Catalysts in the Dry Reforming of Methane

Shangkun Deng 1, Yini Lei 1, Yiyu Deng 1, Yilan Lai 1, Xingyuan Gao 1,2,*

  1. Department of Chemistry and Material Science, Guangdong University of Education, Guangzhou 510303, China

  2. Engineering Technology Development Center of Advanced Materials and Energy Saving and Emission Reduction in Guangdong Colleges and Universities, Guangzhou 510303, China

Correspondence: Xingyuan Gao

Academic Editor: Wei Wang, Simone Mascotto and Bin Lin

Special Issue: Design and Development of Perovskite Materials for Energy Conversion Devices

Received: January 29, 2022 | Accepted: April 20, 2022 | Published: April 26, 2022

Catalysis Research 2022, Volume 2, Issue 2, doi:10.21926/cr.2202012

Recommended citation: Deng S, Lei Y, Deng Y, Lai Y, Gao X. Recent Advances in the Application of Perovskite Catalysts in the Dry Reforming of Methane. Catalysis Research 2022;2(2):15; doi:10.21926/cr.2202012.

© 2022 by the authors. This is an open access article distributed under the conditions of the Creative Commons by Attribution License, which permits unrestricted use, distribution, and reproduction in any medium or format, provided the original work is correctly cited.


The use of the dry reforming of methane (DRM) to convert the two principal greenhouse gases, methane and carbon dioxide, to syngas (a mixture of H2 and CO) has attracted increasing attention in recent years. However, the DRM reaction suffers from the twin disadvantages of carbon deposition and sintering, so a highly efficient and robust catalyst with superior anti-deactivation properties is required. One way to meet this need is to incorporate active metals into crystalline oxides, such as perovskite. In this paper, recent advances in the application of perovskite catalysts in DRM are summarized, with particular attention paid to enhancing interfacial interaction, oxygen vacancies, and surface basicity. The structure-performance relationship is also discussed in depth.


Dry reforming of methane; alloy; support; interface; oxygen vacancy; basicity

1. Introduction

Emissions of greenhouse gases arising from the rising use of fossil fuels have caused, and continue to cause, serious damage to natural ecosystems, such as rising sea levels, drought, and increasingly-frequent storms [1,2,3,4,5,6,7,8,9,10,11,12,13]. In the search for an alternative clean energy source, hydrogen has emerged as the most promising candidate due to its only by-product being H2O, its carbon-free nature, and high energy density. At the same time, in the search for ways to recycle greenhouse gases, the dry reforming of methane (DRM) has attracted a great deal of attention as, through its use, -after a downstream reaction (e.g., water-gas shift reaction) or membrane separation, pure hydrogen can be generated [14,15,16,17,18,19,20,21,22,23,24,25][26,27,28,29,30,31,32,33,34]. In addition, the syngas produced during DRM (consisting of H2 and the other DRM reaction product CO) can be used to synthesize other value-added chemicals through methanol production and the Fischer-Tropsch process [35,36,37,38,39,40,41,42,43].

However, due to the endothermic nature and high carbon content of dry reforming, metal sintering at a high temperature and coke formation deteriorate the performance of current DRM catalysts [44,45,46,47,48,49,50,51,52,53,54,55,56]. To combat these issues, high thermal stability and relatively low-cost perovskite-type oxides have been utilized as catalyst precursors or supports to enhance metal-support interaction (MSI) and tune the surface properties [57,58,59,60]. In addition, the perovskite structure can be partially replaced by other cations, generating a change in oxidation state and improving the redox properties [61]. Yadav et al. [62] synthesized LaNi0.75Ce0.05Zr0.20O3/8MgO-SiO2 to improve DRM conversion efficiency, reduce carbon deposition and improve catalyst stability through enhanced MSI and strong basicity. In contrast, Alenazey et al. [63] prepared a CeCoxNi1−xO3+δ perovskite catalyst by the sol-gel method that showed excellent catalytic performance for DRM due to the atomic-level mixing of metal ions and strong redox properties.

In this paper, we review recent developments in the use of perovskite structures in the preparation of catalysts for DRM and the study of the structure-performance relationship based on interface engineering, oxygen defects, and surface basicity.

2. Reaction Mechanism

The four key steps in the DRM reaction can be listed as:

Adsorption of CH4 and CO2.
Activation of the reactants.
Surface reactions to produce intermediates and products.
Desorption of products (e.g., CO, H2, H2O). 

Eqn. 1 shows the main DRM reaction. This reaction is usually accompanied by a reversed water-gas shift reaction (Eqn. 2), realizing an H2/CO ratio of less than 1 [64]. In contrast, carbon monoxide will undergo a disproportionation reaction (Boudouard reaction (Eqn. 3)) to produce carbon. The decomposition of methane also occurs (Eqn. 4), leading to carbon formation that clogs the active sites of the catalyst, inhibiting catalyst activity [16]. However, in the presence of rapid adsorption and activation of CO2, carbon species might instead be gasified through the reverse Boudouard reaction to form CO. In the presence of perovskite, oxygen mobility and surface oxygen concentration will be enhanced along with the migration of lattice oxygen, and an increase in oxygen defects and lattice distortion, thereby promoting the conversion of the carbon and CHx species into gaseous products (Eqns. 5-9). The adsorption and activation of CO2 is also promoted at the oxygen defects, releasing oxygen radicals to oxidize the carbon deposits and produce CO (Eqn. 10). However, excessive amounts of oxygen vacancies may consume H2 and generate H2O as a side product, which lowers the H2 selectivity of the DRM reaction (Eqns. 11 and 12).

\[ \text{CO}_2 \ + \ \text{CH}_4 \ \rightarrow \ \text{2H}_2 \ + \ \text{2CO} \tag{1} \]

\[ \text{CO}_2 \ + \ \text{H}_2 \ \rightarrow \ \text{H}_2 \text{O} \ + \ \text{CO} \tag{2} \]

\[ \text{2CO} \ \rightarrow \ \text{CO}_2 \ + \ \text{C} \tag{3} \]

\[ \text{CH}_4 \ \rightarrow \ \text{C} \ + \ \text{2H}_2 \tag{4} \]

\[ \text{CH}_4 \ + \ \text{2}^* \ \rightarrow \ \text{CH}_3 \text{ }^* \ + \ \text{H}^* \tag{5} \]

\[ \text{CH}_3\text{ }^* \ + \ ^* \ \rightarrow \ \text{CH} _2 \text{ }^* \ + \ \text{H}^* \tag{6} \]

\[ \text{CH}_2\text{ }^* \ + \ ^* \ \rightarrow \ \text{CH} \text{ }^* \ + \ \text{H}^* \tag{7} \]

\[ \text{CH}\text{ }^* \ + \ ^* \ \rightarrow \ \text{C} \text{ }^* \ + \ \text{H}^* \tag{8} \]

\[ \text{C}^* \ + \ \text{O}_x \ \rightarrow \ \text{CO} \ + \ \text{O}_{x-1} \ + \ \\^* \tag{9} \]

\[ \text{CO}_2 \ + \ \text{O}_{x-1} \ \rightarrow \ \text{O}_x \ + \ \text{CO} \tag{10} \]

\[ \text{4H}^* \ \rightarrow \ \text{2H}_2 \ + \ \text{4}^* \tag{11} \]

\[ \text{H}_2 \ + \ \text{O}_x \ \rightarrow \ \text{O}_{x-1} \ + \ \text{H}_2\text{O} \tag{12} \]

3. Interface Engineering

Due to carbon deposition and metal sintering, metal catalysts tend to be unstable in high-temperature reactions. Enhancing the interface interaction through, for example, the formation of alloys, or the adjustment of the MSI, is a promising strategy for improving catalytic activity [65].

3.1 Alloys

Studies have shown that, when using perovskite oxides as a precursor, Ru or Fe partially replace the A&B position of the ABO3 structure to form alloy particles. For example, when LnFeNi(Ru)O3 perovskite was adopted as a catalyst precursor for DRM, the formation of Ni-Fe-Ru alloy was found to inhibit the agglomeration of Ni clusters and prevented coking, greatly improving the catalytic activity and stability [66]. While Joo et al. introduced Fe into the layered perovskite structure PrBaMn1.7Co0.1Ni0.2O5+δ, resulting in many Co-Ni-Fe ternary alloy nanoparticles forming by topological exsolution. As shown in Figures 1(a) and 1(b), under the catalysis of ternary alloys, the consumption rates of CO2 and CH4 were increased by around 108.7% and 84.8%, respectively, at 900 °C. While Figure 1(c) shows that PrBaMnCoNi-15-Fe maintained excellent activity and stability even after a 350-h operation at 750 °C. According to a density functional theory (DFT) calculation, the enhanced performance of the ternary alloy sample could be attributed to the d-band center upshift and the weakened bond strengths of CH4 and CO2 [67].

Click to view original image

Figure 1 Catalytic properties of PrBaMnCoNi-15-Fe for the consumption of (a) CO2 and (b) CH4. (c) Stability test for the PrBaMnCoNi-15-Fe at 750 °C. Reproduced with permission: © 2021, Elsevier. [67].

In addition to the formation of ternary alloys, binary alloys derived from the perovskites have also been shown to benefit DRM activity. Touahra et al. [68] prepared LaCuCoO3 perovskite catalysts using a citric acid-gel method and showed that after Cu partially replaced Co, the formation of a Cu-Co alloy effectively inhibited the formation of carbon, the agglomeration of active phases, and the reoxidation of CO. As well as Cu-Co alloys, Fe-Ni alloys produced from perovskites have been widely studied for DRM reactions due to their high efficiency and low cost. Shah et al. [69] manipulated the properties of -Fe-Ni alloy nanoparticles by changing the La/Fe ratio in Ni-doped LaFeO3 and found that, with an optimal La/Fe ratio of 1:0.9, a larger surface area and enhanced basicity were achieved, promoting CH4 and CO2 adsorption and activation, while the redox properties of the Fe ions facilitated coke removal. A relatively stable conversion over 24 h operation was achieved with only 2.1 wt% carbon content. The degree of Fe-Ni synergy is determined by the Ni amount in the perovskite precursors. When (La0.75Sr0.25)(Cr0.5Fe0.35Ni0.15)O3 was used in the preparation of Fe-Ni alloys, the oxygen defects were found to be more abundant with the increasing Ni loading, which possibly resulted from the intensified reduction of Fe3+/Fe4+. Owing to the surface Fe-Ni alloy nanoparticles, a high methane conversion of 72% was obtained in this study, outperforming the pristine perovskite catalyst by 20 times [70]. To facilitate alloy formation, highly reducible support is favored - for example, compared with the less reducible strontium titanium ferrite (STF), which only produced a small degree of nickel--iron alloying, lanthanum strontium ferrite (LSF) was found to be more reducible, and the alloying degree was correspondingly higher [71].

3.2 Metal-support Interaction

A strong MSI can also stabilize the active phase of a catalyst, greatly improving catalytic activity. Figueredo et al. [72] adopted nickel as the active metal and LaAlO3 as the support for DRM and compared the performance of their catalysts with that of commercial α-Al2O3. Their results showed that the perovskite support enhanced the catalytic stability at both a high and low gas hourly space velocity (GHSV) (Figures 2(a) and 2(b)). Through the strengthened interaction between the Ni and LaAlO3, the improved activity could be attributed to the generation of voids or channels between the NiO particles or supports, resulting in increased pore volume and average pore size. In addition, due to the presence of NiO, carbon nanotubes were formed on the surface of the catalyst, which enhanced metal dispersion and exposure to the reactants, thus, maintaining the catalytic stability (Figure 2(c)). Bimetallic catalysts supported on perovskite structures have also been developed. To improve the stability and activity of the catalyst, Kim et al. [73] introduced Co and Mn into a LaNiO3 perovskite. They showed that the addition of Mn strengthened the Ni-La2O3 interaction without blocking the Ni sites. While the immediate removal of cokes by the Mn species favored CO formation between the O on the support and C on the metal surface.

Click to view original image

Figure 2 Stability tests in the DRM reaction in terms of the (a) H2 and (b) CO yields with different GHSV. (c) Schematic illustration of the growth of carbon nanotubes on the surface of Ni/LaAlO3. Reproduced with permission: © 2018, Elsevier. [72].

To improve dispersion, perovskite catalysts can also be supported on oxides. For example, mesoporous SiO2 has been used as the support for LaNiO3, and the dispersal of the perovskite through the SiO2 pores did not destroy the mesoporous structure. Moreover, the migration of nickel clusters on the supported perovskite was restricted due to the strong anchoring effect, which greatly improved the long-term catalytic stability [58,74]. Al2O3 and CeSiO2 have also been used as supports for perovskite catalysts [75]. In-situ XPS experiments under DRM reaction conditions showed that CO2 oxidized the metallic nickel particles in an Al2O3-supported catalyst. While the use of a CeSiO2 support limited the oxidation of the metal active phase. Raman spectroscopy and thermogravimetric analysis also showed that the LaNiO3 supported on CeSiO2 better suppressed carbon deposition than both Al2O3-supported LaNiO3 and pristine LaNiO3 (Figure 3). This was attributed mainly to the high oxygen storage capacity of CeSiO2, which reacted to the presence of carbon and kept the catalyst surface free of carbon-containing residues.

Click to view original image

Figure 3 (a) Raman spectrum of the three catalysts after reaction (I) LaNiO3 (II) LaNiO3/Al2O3, and (III) LaNiO3/CeSiO2. (b) TPO profiles of the catalysts after a DRM reaction at 1073 K. Reproduced with permission: © 2018, Elsevier. [75].

4. Oxygen Vacancy

Oxygen vacancies promote CO2 adsorption, accelerate the migration of oxygen atoms and enhance the anti-coking property of the host catalyst [76]. In recent studies, transition metals, rare earth metals, and alkaline earth metals have been doped into the A and B sites of perovskite catalysts to tune the concentration of oxygen vacancies [72,77]. When alkaline earth metals were doped to the perovskite for DRM reaction, surface oxygen vacancies were seen to be produced due to the resulting valence state imbalance, facilitating CO2 adsorption and dissociation into oxygen radicals, which gasifies the carbon species generated from the decomposition of CH4 [78]. When La2Zr1.44Ni0.56O7-d was partially replaced by Sr and Ca in the A site, the higher concentration of oxygen vacancy was seen to restrict the growth of Ni particles, while the mechanism of carbon reverse growth was used to explain the anti-coking ability. However, it was suggested that the shielding effect of ZrO2 might lower the surface oxygen vacancy amount [79]. As well as alkali earth metals, the rare earth metal Ce was found to be able to partially replace at the A site of the LaNi0.5Fe0.5O3 perovskite. The redox cycle of Ce3+ and Ce4+ rendered CeO2 a good oxygen storage material, promoting both coke removal and high conversions in the DRM reaction [80]. In addition, transition metals have been added into perovskites to generate oxygen vacancies. Different from alkaline earth metals-doped perovskites, where lattice oxygen migration is only promoted when the perovskite structure is maintained, perovskite structures containing transition metals still possess oxygen defects and oxygen storage capacity even after the decomposition of perovskites into pure metals and single metal oxides under the reductive and reaction conditions, facilitating CO2 activation and carbon elimination. Shahnazi et al. synthesized LaNiMnO3 (LNM) perovskite by ultrasonic spray pyrolysis, in which the substitution of Mn on the perovskite increased the specific surface area, pore size, and pore volume, leading to higher oxygen mobility, which reduced carbon deposition and transformed the carbon structure from a whisker to the amorphous type. As shown in Figure 4(a), the partial substitution of Ni by Mn enhanced the monoatomic oxygen vacancy (O) on the surface, which is reflected by the much higher peak intensity at 300-500 °C. As a result, the carbon deposition was greatly inhibited, as shown by the Raman spectroscopic results (Figure 4(b)). As it can be seen, the peak corresponding to ordered carbon sheets at 1583 cm-1 was absent with the addition of Mn; moreover, the amorphous carbon phase (the peak at around 1300 cm-1) was considerably reduced due to the oxygen vacancies and mobility promoted by the redox cycle of Mn4+/Mn3+ [81].

Click to view original image

Figure 4 (a) O2-TPD of fresh LNM, and (b) Raman spectra of the spent LNM catalysts after a 10 h DRM reaction at 750 °C. Reproduced with permission: © 2017, Elsevier. [81].

Another transition metal, Fe, has also proven effective in adjusting the number of oxygen defects in perovskite structures. Das et al. [64] developed La0.9Sr0.1NiO3 perovskites with a partial replacement of Ni by Fe. Owing to the redox cycle between the Fe3+/Fe4+ ions and NiFe alloys, the reversible formation and decomposition of the perovskite structure were realized, accompanied by the capture and release of oxygen, enabling a coke-resistant and stable DRM process. Similar to the case with the non-noble transition metals, Sr0.92Y0.08Ti0.98Ru0.02O3+/−δ (SYTRu) was synthesized when the noble metal Ru was doped in the SYT perovskite lattice. The shift of the oxygen p-band to the Fermi level indicated a weaker Ru-O bond than the O-Ti bond, generating lower formation energy of oxygen vacancies and a higher concentration of surface oxygen, which presented a high activity in the DRM reaction [82].

5. Surface Basicity

In a perovskite catalyst, optimized basicity strengthens CO2 adsorption [83,84]. Ruan et al. [85] doped Si into a LaAl0.25Ni0.75O3 perovskite to modify the structure and improve the surface basicity, facilitating CO2 adsorption and activation, which improved the conversion efficiency and carbon elimination. As well as the use of Si, Sr and Ni have also been added into the LaCrO3 perovskite structure. The basicity was enhanced due to the presence of Sr, promoting the adsorption and dissociation of CO2 at the basic sites during the DRM reaction [86]. Figure 5 shows the CO2-TPD profiles of R-80, R-71, R-62 and R-53 catalysts (La0.8Cr0.85Ni0.15O3, La0.7Sr0.1Cr0.85Ni0.15O3, La0.6Sr0.2Cr0.85Ni0.15O3 and La0.5Sr0.3Cr0.85Ni0.15O3, respectively). Two desorption peaks can be observed near 300 and 650 °C, corresponding to CO2 desorption from the weak and strong basic sites of the catalyst. Since the amount of CO2 desorbed was directly related to the basicity, the higher peak intensities of CO2 desorption for R-53 indicated the promotional effect of the presence of Sr on the surface alkalinity. Sr and Ca have also been added into the LaNi0.5Fe0.5O3 perovskite structure. Both modified perovskite catalysts exhibited a considerably larger CO2 desorption peak than the pristine one, suggesting much stronger basicity. Due to the stronger alkalinity of Sr compared to Ca, the desorption temperature of the Sr-doped sample shifted to a higher region than the Ca-doped one, which enabled a higher conversion for the Ca-doped catalyst below 800 °C (e.g., 58.7% vs 51.5% CH4 conversions at 750 °C).

The promotional effect of adding alkali earth metals on coke removal is the result of the basic oxide reacting with CO2 to form carbonates or oxocarbonates, which oxidized the carbon to form a metal oxide and CO [84]. Thus, the existence of Sm2O3 in the SmCoO3 perovskite catalyst was the origin of the improved basicity, promoting CO2 adsorption and subsequent dissociation into oxygen radicals, which easily gasified the deposited carbon to produce CO [87]. However, in certain scenarios, the basicity may not be the dominant factor in the degree of carbon deposition. In the study of the use of La0.46Sr0.34Ti0.9Ni0.1O3 in the DRM reaction, the sample was reduced at lower temperatures (700 °C) and possessed a larger number of basic sites based on the higher peak intensity of CO2 desorption. However, surprisingly, the coke formation on the catalyst was serious following the reaction [88].

Click to view original image

Figure 5 CO2-TPD profiles of the reduced catalysts. Reproduced with permission: © 2020, Elsevier. [86].

6. Conclusion and Prospect

In this review, the recent progress in the application of perovskite catalysts in the DRM reaction is summarized, including the fields of interface engineering and enhancing oxygen vacancies and surface basicity. The interfacial force consists of metal-metal interactions in the alloys and the metal-support interaction, both of which can improve the active phase dispersion. While the oxygen vacancies on the catalyst also affect the catalytic activity by accelerating the migration of oxygen atoms and improving the anti-coking ability. And the surface basicity of the catalyst is strongly related to CO2 adsorption and activation, which enhances the conversion rate and coke removal in the DRM reaction.

Despite the progress made, there is still scope for improvement. For example, the loading of active sites derived from perovskite precursors is higher than for other precursors, which may intensify metal agglomeration and increase the cost. Advanced methods such as the impregnation of perovskite precursors onto mesoporous materials are promising solutions. Existing preparation methods for perovskites also need to be modified to satisfy industrial demand and other large-scale applications. Ball-milling is a possible solution; however, the particle size and morphology that results from the use of this approach might be a concern for the conversion efficiency in the DRM reaction.

There is also scope for the application of machine learning to the systematic search for the ideal candidate for certain reactions, as the compositional elements and the corresponding ratios can be readily incorporated into suitable models, increasing the efficiency and enabling large-scale searches. Nanocomposites combining the perovskites and other compounds (like oxides, spinels, and natural minerals) are also an attractive solution, offering several synergies. But the interface strength between each component would need to be strong. Finally, integrated reaction systems containing a catalyst (not necessarily perovskite) coated onto a gas-permeating membrane structure made of defective perovskites could enhance the conversion efficiency by driving the surface/interface mass transfer and overcoming thermodynamic limitations.


The authors gratefully thank the financial support from Guangzhou Basic and Applied Basic Research Project in China: 202102020134; Youth Innovation Talents Project of Guangdong Universities (natural science): 2019KQNCX098.

Author Contributions

S.K. Deng: Conceptualization, Data curation, Investigation, Writing - original draft, Writing - review & editing; Y.N. Lei: Conceptualization, Data curation, Investigation, Writing - original draft, Writing - review & editing; Y.Y. Deng: Data curation, Writing - original draft; Y.L. Lai: Data curation; X.Y. Gao: Funding acquisition, Resources, Project administration, Supervision, Validation.

Competing Interests

The authors have declared that no competing interests exist.


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