by Despina Vamvuka  and Christia Loulashi

Received: 24 May 2022;  Published: 29 September 2022;  doi: 10.21926/cr.2203031

The present study investigated the co-gasification of two different lignites blended with the forest residue collected from the land restoration activity sites of open-pit mines located in the region of the Ptolemais basin in North Greece performed under the carbon dioxide stream. All samples were devolatilized in a fixed bed unit prior to the gasification evaluations. The gasification evaluations were performed using a thermal analysis system (TG/DTG) operated at temperatures of up to 1000 °C. [...]

by Pari Muradova

Received: 24 June 2022;  Published: 26 September 2022;  doi: 10.21926/cr.2203030

by Kuldeep Saini  , Vinay Mohan Pathak  , Arpit Tyagi  and Rani Gupta

Received: 11 June 2022;  Published: 22 September 2022;  doi: 10.21926/cr.2203029

Cyclodextrin glycosyltransferase (CGTase) is a multifunctional enzyme that hydrolyzes the α-glycosidic bond between two sugar molecules and synthesizes cyclodextrins (CDs) and other transglycosylation products. It is a ubiquitously present extracellular enzyme that offers the CGTase-producing organism the sole right onto starch substrates over other microbes. The present review provides a brief account of diversity among CGTase-producing microbes, CGTase production in differ [...]

by Le Thanh Mai Pham  , Kai Deng  , Trent R. Northen  , Steven W. Singer  , Paul D. Adams  , Blake A. Simmons  and Kenneth L. Sale

Received: 26 July 2022;  Published: 20 September 2022;  doi: 10.21926/cr.2203028

Lignin is the most abundant renewable source of aromatics on earth, and conversion of it to chemicals and fuels is needed to build an economically viable renewable biofuels industry. Biological routes to converting lignin to fuels and chemicals involve depolymerizing lignin using lignin-degrading enzymes that catalyze the breaking of ether and carbon-carbon bonds in the phenolic and non-phenolic subunits of lignin. Laccases are a crucial class of lignin-degrading enzymes and are copper-containin [...]

by Mikhail Kipnis  , Elvira Volnina  , Igor Belostotsky  , Roman Galkin  , Natalya Zhilyaeva  , Ivan Levin  , Sergey Kottsov  and Alexander Ezhov

Received: 09 September 2021;  Published: 19 September 2022;  doi: 10.21926/cr.2203027

by Gabriel Santos Viana  , Jorge Álef Estevam Lau Bomfim  , Gabriel Pereira da Silva  , José Faustino Souza de Carvalho Filho  , Miriam Sanae Tokumoto  , Fernando Cesário Rangel  and Rosenira Serpa da Cruz

Received: 30 June 2022;  Published: 13 September 2022;  doi: 10.21926/cr.2203026

Technological development made in the field of biomass application allows synthesizing several high-value products, such as furfuraldehyde. Furfural, produced through sequential hydrolysis and dehydration reactions from biomass, is considered a platform molecule and a precursor of several other chemicals and biofuels that are generated following reactions such as hydrogenation, hydrodeoxygenation, and decarboxylation. This review aims to reveal the environmental-friendly mechanisms followed for [...]

by Jiaqiang Wang  , Jiao He  , Liang Jiang  , Lulu Xie  , Juanxue Kang  and Wei Wang

Received: 16 July 2022;  Published: 09 September 2022;  doi: 10.21926/cr.2203025

by Dafné Silva  , Laís Nerys  , Carlos Silva  , Elizabeth Borba  , Tonny Leite  , Teresinha Silva  and Amanda Sena

Received: 27 May 2022;  Published: 25 August 2022;  doi: 10.21926/cr.2203024

by Virginia M.R. Menezes  , Gustavo M. Paula  , Liliane A. Lima  , Meiry G.F. Rodrigues  and Fabiano A.N. Fernandes

Received: 05 May 2022;  Published: 16 August 2022;  doi: 10.21926/cr.2203023

In this study, we investigated the oligomerization mechanism of the Fischer-Tropsch synthesis catalyzed by a cobalt-based catalyst supported by SBA-15. The Co/SBA-15 catalyst contained 20% w/w of cobalt. It was prepared by the wet impregnation method and characterized by X-ray diffraction (XRD), N₂ adsorption-desorption, temperature-programmed reduction (TPR), and scanning electron microscopy coupled to X-ray energy dispersion spectroscopy (SEM-EDS). The FT synthesis was c [...]

by Olushola S. Ayanda  , Cecilia C. Oforkansi  , Omolola H. Aremu  , Oluwakemi E. Ogunjemiluyi  , Ololade L. Olowoyeye  and Cecilia O. Akintayo

Received: 26 June 2022;  Published: 25 July 2022;  doi: 10.21926/cr.2203022

In this study, we investigated the degradation of amido black dye in an aqueous solution using ultra-violet (UV) light catalyzed by iron oxide nanoparticles (nano-Fe). The nano-Fe was synthesized by sodium borohydride reduction of ferric chloride solution and was characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and X-ray fluorescence spectrophotometry (XRF). The SEM of the nano-Fe showed regular spherical particles, the XRD examination showed a weak and broad peak at [...]

by Anilkumar Mettu  , Ninad Loke  , Vilas Patil  , Rahul Panday  and Sreenivasarao Gajula

Received: 10 January 2022;  Published: 19 July 2022;  doi: 10.21926/cr.2203021

In this study, we present selective hydrocracking of poly (di and tri) aromatic compounds to monoaromatics, such as benzene, toluene, and xylenes (BTX), over a mixture of Pt/Al₂O₃ and Y zeolites. The polyaromatic compounds feed is a combined simulated model feed, which is similar to light cycle oil (LCO) in composition. The feed is processed in a fixed bed reactor over a catalyst mixture: in the first step, selective hydrogenation of di and tri-aroma [...]

by Luiz Felipe da M. Rocha  , Leonardo C. Ferreira  , Maria de Fatima V. Marques  , Rodrigo S. Bitzer  and Marco Antônio Chaer Nascimento

Received: 18 May 2022;  Published: 06 July 2022;  doi: 10.21926/cr.2203020

We synthesized and spectroscopically characterized a new heterotrimetallic {Ti₂Ni} ethylene (co)polymerization precatalyst containing one (α-diimine)NiBr₂ and two (phenoxy-imine)TiCl₄ scaffolds. Its calculated structure was investigated at the DFT B3LYP/LACVP** level. Our calculations showed that the titanium(IV) centers were in a slightly distorted trigonal bipyramidal environment, and the average Ti···Ni distance was 8.76 Å. [...]

by Galina Huseynova  , Gulbeniz Мuхtаrоvа  , Nushaba Aliyeva  , Gular Gаsimоvа  and Sanubar Rаshidоvа

Received: 05 May 2022;  Published: 05 July 2022;  doi: 10.21926/cr.2203019

This article provides an overview of zeolite-containing catalysts used in the alkylation of benzene and toluene with olefins, isobutane with butenes and butane-butene fractions, gasoline and oil fractions with olefins, propane-propylene, and butane-butylene fractions of catalytic cracking. Zeolites have various types of structures, including BEA, MFI, MWW, FAU, etc., which differ in pore size and the number and location of the channels. High-silica zeolites have a large pore volume, high acidity [...]

by Jiarui Fang  , Ziheng Li  , Xiruo Bai  , Yichu Zhang  , Jiahui Liu  , Dan Wang  and Ye Yao

Received: 10 May 2022;  Published: 04 July 2022;  doi: 10.21926/cr.2203018

TiO₂ (001) crystal plane exhibits molecular adsorption and photocatalytic activity. The loading capacity of reactive oxygen species present on crystal planes helps in the significant improvement of catalytic activity. The methods of synthesis and conditions of existence significantly affect the molecular adsorption properties of crystal planes, which in turn affects the ability of the system to load reactive oxygen species. Herein, we report the simulation of the molecular [...]