by Nicolas A. Ishiki  , Maria L. Della-Costa  , Beatriz Keller  , Kleper O. Rocha  , Francielle Bortoloti  and Antonio C. D. Ângelo

Received: 04 September 2023;  Published: 16 November 2023;  doi: 10.21926/cr.2304027

This paper investigates how the aggregation of bimetallic nanoparticles (NPs) influences the electronic condition of the surface adsorption site and, hence, the performance of materials during the electrooxidation of fuels in an alkaline medium. First, we synthesized Pt-Ni NPs in three configurations: ordered intermetallic, ordinary alloy, and core-shell. The NPs contained Pt and Ni close to a 1:1 Pt/Ni atomic ratio. They had similar particle sizes, which allowed us to evaluate their performance without the influen [...]

by Daria Armani  and Antonella Petri

Received: 16 June 2023;  Published: 08 November 2023;  doi: 10.21926/cr.2304026

This paper will present some sectors in which enzymes can replace traditional catalysts in poly(butylene-succinate) industry, emphasizing the green chemistry aspects associated with these newer strategies.

by Bhabani Shankar Mohanta  , Rita Das  and Nigamananda Das

Received: 21 December 2022;  Published: 13 October 2023;  doi: 10.21926/cr.2304025

Tungstophosphate (PW12O403-) intercalated ZnAl-Layered double hydroxide (ZnAl-PW12) was successfully synthesized through the rehydration of calcined LDH. Chemical analyses and characterizations by powder XRD, FT-IR, and Diffuse reflectance UV-Vis spectra confirmed the intercalation of PW12O403- ions equivalent to ~80% of the residual positive charge in the brucite layer. The efficiency of ZnAl-PW12 for decolourisation of four structurally different cationic/anionic dyes through simultaneous adsorption and photocata [...]

by Abanti Nag

Received: 27 July 2023;  Published: 11 October 2023;  doi: 10.21926/cr.2304024

In the era of renewable and sustainable energy, perovskite materials remain pioneers as energy harvesting materials, be it thermoelectric waste heat harvesting or photovoltaic solar cell application. Oxide perovskite material is an emerging thermoelectric material in solving energy shortage issues through waste heat recovery. The chemical and structural stabilities, oxidation resistance, and cost-effective and straightforward manufacturing process are a few advantages of the oxide-based thermoelectric materials. Th [...]

by Michel Z. Fidelis  , Elaine Trojan de Paula  , Eduardo Abreu  , Maria E.K. Fuziki  , Onelia A. A. dos Santos  , Rodrigo Brackmann  and Giane G. Lenzi

Received: 18 September 2023;  Published: 22 September 2023;  doi: 10.21926/cr.2303023

Due to its similar characteristics to titanium, niobium has become an attractive alternative in photocatalytic processes. Research indicates that titania has an optimal percentage of phases resulting in a commercial catalyst, P25, that contains more than 70% anatase with a minor amount of rutile and a small amount of amorphous phase. On the other hand, for Nb2O5, percentage optimization was little explored in the literature, which consists of studying the phases obtained via heat treatment individually and in diffe [...]

by Carsten Unglaub  and Andreas Jess

Received: 27 June 2023;  Published: 12 September 2023;  doi: 10.21926/cr.2303022

Accumulation of wax inside the catalyst pores during transient cobalt-catalyzed Fischer-Tropsch synthesis (FTS) leads to unfavorable product distribution and low activity by imposing internal mass transfer limitations. The condensation of paraffin severely changes the apparent product stream that actually leaves the reactor before the catalyst pores are filled completely and the steady state is reached. Thus, the product distribution of the transient FTS is less complex than expected in comparison to the steady-sta [...]

by Galina Huseynova  , Nushaba Aliyeva  and Gular Gаsimоvа

Received: 20 April 2023;  Published: 10 August 2023;  doi: 10.21926/cr.2303021

In the oil distillate fraction alkylation process, a modified Zr zeolite ZSM-5 was obtained and studied. The modification was executed using a method that impregnated ZSM-5 with a 5% solution of ZrOCl2∙6H2O. X-ray diffraction studies were conducted on zeolite ZSM-5, zirconyl chloride modifier ZrOCl2∙6H2O, and modified zeolite ZSM-5-ZrO2, which was calcined at temperatures of 200, 400, and 550°C. The results revealed that the phase composition of modified ZSM-5-ZrO2 zeolite samples varied depending on the calcinatio [...]

by Preetam Datta  and Subhasis Roy

Received: 15 April 2023;  Published: 05 July 2023;  doi: 10.21926/cr.2303020

With increasing population levels and rapidly growing industries worldwide, the purification of water contaminated with different impurities is one of the biggest challenges we face in recent times. Photocatalysis holds great potential as an efficient mineralization process to remove the foreign matter present in wastewater. Rapid advancement in innovative materials development has made photocatalysis the frontrunner among different water treatment methods. Our main priority lies in different strategic approaches t [...]

by Mona Liza Santana  , Aline Santos e Santos  , Gildomar L.V. Júnior  and Sandra Aparecida de Assis

Received: 24 December 2022;  Published: 12 June 2023;  doi: 10.21926/cr.2302019

Microorganisms that are capable of degrading lignocellulolytic materials can produce extracellular cellulase complexes. Microorganisms are an excellent alternative for the production of cellulolytic complex, since these sources have a high power of multiplication. In this work, we researched the production by the fungus Moniliophthora perniciosa. The production and pH and temperature optimum optimization were studied by Response surface methodology and carboxymethylcellulase (CMCase) characterization. Thermal stabi [...]

by Christopher K. Russell  , Arunima Saxena  and Jeffrey T. Miller

Received: 28 March 2023;  Published: 06 June 2023;  doi: 10.21926/cr.2302018

Previous studies on the conversion of olefins to aromatics with bifunctional Ga- or Zn-ZSM-5 catalysts have concluded that benzene, toluene, and xylenes (BTX) yields are significantly higher than for ZSM-5 alone. These results were attributed to the higher aromatic dehydrogenation rate of Ga or Zn. In this study, a highly active, bifunctional PtZn/SiO2 (1.3 wt% Pt, 2.6 wt% Zn) with H-ZSM-5 (Si/Al = 40) catalyst is investigated for propene aromatization at 723 K and 823 K. At low to moderate propene conversions, in [...]