Understanding of the Key Factors Determining the Activity and Selectivity of CuZn Catalysts in Hydrogenolysis of Alkyl Esters to Alcohols

CuZn catalysts are perspective catalysts for esters hydrogenolysis, but more knowledge is needed to optimize their catalytic performance. In this work, we consider the impact of CuZn catalysts composition on their structure, activity, selectivity, and stability in esters hydrogenolysis. Four catalys...

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Autores principales:	Oleg Kikhtyanin, Jaroslav Aubrecht, Violetta Pospelova, David Kubička
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	ester hydrogenolysis CuZn catalyst transesterification methyl hexanoate hexyl hexanoate Chemical technology TP1-1185 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/08fca5aa25e4404fac3c7e023c1ff9fc
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spelling	oai:doaj.org-article:08fca5aa25e4404fac3c7e023c1ff9fc2021-11-25T17:07:07ZUnderstanding of the Key Factors Determining the Activity and Selectivity of CuZn Catalysts in Hydrogenolysis of Alkyl Esters to Alcohols10.3390/catal111114172073-4344https://doaj.org/article/08fca5aa25e4404fac3c7e023c1ff9fc2021-11-01T00:00:00Zhttps://www.mdpi.com/2073-4344/11/11/1417https://doaj.org/toc/2073-4344CuZn catalysts are perspective catalysts for esters hydrogenolysis, but more knowledge is needed to optimize their catalytic performance. In this work, we consider the impact of CuZn catalysts composition on their structure, activity, selectivity, and stability in esters hydrogenolysis. Four catalysts with various Cu/Zn ratio were synthesized by a co-precipitation and characterized in as-prepared, calcined, reduced, and spent state by XRF, XRD, N<sub>2</sub> physisorption, CO<sub>2</sub>-TPD, NH<sub>3</sub>-TPD, and N<sub>2</sub>O chemisorption. XRD data revealed the effect of the composition on the size of Cu and ZnO particles. The catalytic performance was investigated using an autoclave. All catalysts exhibited high methyl hexanoate conversion about 48–60% after 3 h but their activity and selectivity were found to be dependent on Cu/Zn ratio. The conversion of methyl hexanoate and hexyl hexanoate was compared to explain the observed product selectivity. Moreover, the catalysts stability was investigated in three consecutive reaction cycles and correlated with changes in the size of constituent particles. Moreover, when different esters were tested, a slight decrease in conversion and increase in alcohol selectivity with a growth in molecule size was observed. Obtained results allow making a conclusion about the optimal composition that provides the good performance of CuZn catalysts in ester hydrogenolysis.Oleg KikhtyaninJaroslav AubrechtVioletta PospelovaDavid KubičkaMDPI AGarticleester hydrogenolysisCuZn catalysttransesterificationmethyl hexanoatehexyl hexanoateChemical technologyTP1-1185ChemistryQD1-999ENCatalysts, Vol 11, Iss 1417, p 1417 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	ester hydrogenolysis CuZn catalyst transesterification methyl hexanoate hexyl hexanoate Chemical technology TP1-1185 Chemistry QD1-999
spellingShingle	ester hydrogenolysis CuZn catalyst transesterification methyl hexanoate hexyl hexanoate Chemical technology TP1-1185 Chemistry QD1-999 Oleg Kikhtyanin Jaroslav Aubrecht Violetta Pospelova David Kubička Understanding of the Key Factors Determining the Activity and Selectivity of CuZn Catalysts in Hydrogenolysis of Alkyl Esters to Alcohols
description	CuZn catalysts are perspective catalysts for esters hydrogenolysis, but more knowledge is needed to optimize their catalytic performance. In this work, we consider the impact of CuZn catalysts composition on their structure, activity, selectivity, and stability in esters hydrogenolysis. Four catalysts with various Cu/Zn ratio were synthesized by a co-precipitation and characterized in as-prepared, calcined, reduced, and spent state by XRF, XRD, N<sub>2</sub> physisorption, CO<sub>2</sub>-TPD, NH<sub>3</sub>-TPD, and N<sub>2</sub>O chemisorption. XRD data revealed the effect of the composition on the size of Cu and ZnO particles. The catalytic performance was investigated using an autoclave. All catalysts exhibited high methyl hexanoate conversion about 48–60% after 3 h but their activity and selectivity were found to be dependent on Cu/Zn ratio. The conversion of methyl hexanoate and hexyl hexanoate was compared to explain the observed product selectivity. Moreover, the catalysts stability was investigated in three consecutive reaction cycles and correlated with changes in the size of constituent particles. Moreover, when different esters were tested, a slight decrease in conversion and increase in alcohol selectivity with a growth in molecule size was observed. Obtained results allow making a conclusion about the optimal composition that provides the good performance of CuZn catalysts in ester hydrogenolysis.
format	article
author	Oleg Kikhtyanin Jaroslav Aubrecht Violetta Pospelova David Kubička
author_facet	Oleg Kikhtyanin Jaroslav Aubrecht Violetta Pospelova David Kubička
author_sort	Oleg Kikhtyanin
title	Understanding of the Key Factors Determining the Activity and Selectivity of CuZn Catalysts in Hydrogenolysis of Alkyl Esters to Alcohols
title_short	Understanding of the Key Factors Determining the Activity and Selectivity of CuZn Catalysts in Hydrogenolysis of Alkyl Esters to Alcohols
title_full	Understanding of the Key Factors Determining the Activity and Selectivity of CuZn Catalysts in Hydrogenolysis of Alkyl Esters to Alcohols
title_fullStr	Understanding of the Key Factors Determining the Activity and Selectivity of CuZn Catalysts in Hydrogenolysis of Alkyl Esters to Alcohols
title_full_unstemmed	Understanding of the Key Factors Determining the Activity and Selectivity of CuZn Catalysts in Hydrogenolysis of Alkyl Esters to Alcohols
title_sort	understanding of the key factors determining the activity and selectivity of cuzn catalysts in hydrogenolysis of alkyl esters to alcohols
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/08fca5aa25e4404fac3c7e023c1ff9fc
work_keys_str_mv	AT olegkikhtyanin understandingofthekeyfactorsdeterminingtheactivityandselectivityofcuzncatalystsinhydrogenolysisofalkylesterstoalcohols AT jaroslavaubrecht understandingofthekeyfactorsdeterminingtheactivityandselectivityofcuzncatalystsinhydrogenolysisofalkylesterstoalcohols AT violettapospelova understandingofthekeyfactorsdeterminingtheactivityandselectivityofcuzncatalystsinhydrogenolysisofalkylesterstoalcohols AT davidkubicka understandingofthekeyfactorsdeterminingtheactivityandselectivityofcuzncatalystsinhydrogenolysisofalkylesterstoalcohols
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Understanding of the Key Factors Determining the Activity and Selectivity of CuZn Catalysts in Hydrogenolysis of Alkyl Esters to Alcohols

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