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Abdullah A, Abdullah AZ, Ahmed M, Okoye PU, Shahadat M. A review on bi/multifunctional catalytic oxydehydration of bioglycerol to acrylic acid: Catalyst type, kinetics, and reaction mechanism. CAN J CHEM ENG 2021. [DOI: 10.1002/cjce.24295] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Anas Abdullah
- School of Chemical Engineering Universiti Sains Malaysia Nibong Tebal Malaysia
| | | | - Mukhtar Ahmed
- School of Chemical Engineering Universiti Sains Malaysia Nibong Tebal Malaysia
| | - Patrick U. Okoye
- Laboratorio de Bioenergía Instituto de Energías Renovables (IER‐UNAM) Temixco Mexico
| | - Mohammad Shahadat
- School of Chemical Engineering Universiti Sains Malaysia Nibong Tebal Malaysia
- Department of Biochemical Engineering and Biotechnology Indian Institute of Technology IIT Delhi India
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Lacerda LCT, Pires MS, Oliveira ISS, Silva TC, de Castro AA, Corrêa S, Vaiss VS, Ramalho TC. Bulk and surface theoretical investigation of Nb-doped δ-FeOOH as a promising bifunctional catalyst. J Mol Model 2021; 27:249. [PMID: 34387739 DOI: 10.1007/s00894-021-04864-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2021] [Accepted: 07/29/2021] [Indexed: 11/30/2022]
Abstract
The development of bifunctional catalysts is of great interest in fine chemistry, since they are capable of promoting multicatalytic reactions involved in several important industrial processes. Iron oxyhydroxides have been identified as low-cost bifunctional catalysts. However, their applications are limited due to their weak acid character. Thus, elaborated modifications of these systems can significantly contribute to increasing their activities and selectivity. This work consists in the study, through DFT calculations, of the properties of the bulk and the surface of feroxyhyte (δ-FeOOH) doped with niobium, as a potential bifunctional catalyst. We identified the formation of stronger van der Waals interactions among the doped δ-FeOOH layers, which can increase the thermal stability of the catalyst. In addition, evidence has been found that the insertion of Nb increases Brönsted acidity and gives rise to new Lewis acid sites on the catalyst surface.
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Affiliation(s)
- Lívia C T Lacerda
- Federal Institute of the North of Minas Gerais, Pirapora Unit. Av. Humberto Mallard, 1355, Pirapora, MG, , 39270-000, Brazil.,Department of Chemistry, Federal University of Lavras, P.O. Box 3037, Lavras, MG, 37200-000, Brazil
| | - Maíra S Pires
- Department of Chemistry, Federal University of Lavras, P.O. Box 3037, Lavras, MG, 37200-000, Brazil.,Federal Center of Technological Education of Minas Gerais, Varginha Unit, Av Imigrantes, Varginha, MG, Brazil
| | - Igor S S Oliveira
- Department of Chemistry, Faculty of Science, University of Hradec Kralove, Hradec Kralove, Czech Republic
| | - Telles C Silva
- Department of Chemistry, Federal University of Lavras, P.O. Box 3037, Lavras, MG, 37200-000, Brazil
| | | | - Silviana Corrêa
- Department of Chemistry, Federal University of Lavras, P.O. Box 3037, Lavras, MG, 37200-000, Brazil
| | - Viviane S Vaiss
- Department of Chemistry, Federal University of Lavras, P.O. Box 3037, Lavras, MG, 37200-000, Brazil
| | - Teodorico C Ramalho
- Department of Chemistry, Federal University of Lavras, P.O. Box 3037, Lavras, MG, 37200-000, Brazil. .,Department of Chemistry, Faculty of Science, University of Hradec Kralove, Hradec Kralove, Czech Republic.
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Kalinkin MO, Yanchenko MY, Buldakova LY, Dmitriev AV, Zhuravlev NA, Kellerman DG. Photocatalytic activity of LiMgPO4 in the hydroquinone decomposition and related surface phenomena. REACTION KINETICS MECHANISMS AND CATALYSIS 2020. [DOI: 10.1007/s11144-020-01754-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Valorization of Glycerol through the Enzymatic Synthesis of Acylglycerides with High Nutritional Value. Catalysts 2020. [DOI: 10.3390/catal10010116] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
The production of specific acylglycerides from the selective esterification of glycerol is an attractive alternative for the valorization of this by-product of the biodiesel industry. In this way, products with high added value are generated, increasing the profitability of the overall process and reducing an associated environmental threat. In this work, nutritional and medically interesting glycerides were obtained by enzymatic esterification through a two-stage process. In the first stage, 1,3-dicaprin was obtained by the regioselective esterification of glycerol and capric acid mediated by the commercial biocatalyst Lipozyme RM IM. Under optimal reaction conditions, 73% conversion of fatty acids and 76% selectivity to 1,3-dicaprin was achieved. A new model to explain the participation of lipase in the acyl migration reaction is presented. It evaluates the conditions in the microenvironment of the active site of the enzyme during the formation of the tetrahedral intermediate. In the second stage, the esterification of the sn-2 position of 1,3-dicaprin with palmitic acid was performed using the lipase from Burkholderia cepacia immobilized on chitosan as the biocatalyst. A biocatalyst containing 3 wt % of lipase showed good activity to esterify the sn-2 position of 1,3-dicaprin. A mixture of acylglycerides consisting mainly of capric acid esterified at sn-1 and sn-3, and of palmitic acid at the sn-2 position was obtained as the reaction product. The influence of the biocatalyst mass, the reaction temperature, and the molar ratio of substrates were evaluated for this reaction using a factorial design. Simple models were used to adjust the consumption of reagents and the generation of different products. The reaction product contained between 76% and 90% of acylglycerides with high nutritional value, depending on the reaction conditions.
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Silva TC, de Almeida KJ, dos Santos Pires M, de Castro AA, Gonçalves MA, da Cunha EFF, Ramalho TC. Theoretical structural and electronic analyses with emphasis on the reactivity of iron oxide prototypes in methane C–H bond activation. REACTION KINETICS MECHANISMS AND CATALYSIS 2016. [DOI: 10.1007/s11144-016-1103-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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