Glycerol Hydrogenolysis to Produce 1,2-Propanediol in Absence of Molecular Hydrogen Using a Pd Promoted Cu/MgO/Al<sub>2</sub>O<sub>3</sub> Catalyst

The catalytic process of glycerol hydrogenolysis to produce 1,2-propandiol (1,2-PD) in the absence of external hydrogen addition has been investigated. The methanol present in the crude glycerol from a biodiesel production process is used to provide in situ hydrogen produced via methanol steam refor...

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Autores principales:	Yuanqing Liu, Michael Wu, Garry L. Rempel, Flora T.T. Ng
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	glycerol hydrogenolysis in situ hydrogen methanol steam reforming acetol hydrogenation Pd promoter factorial design Chemical technology TP1-1185 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/82a2be18b8474dcc9670fd3227311e64
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spelling	oai:doaj.org-article:82a2be18b8474dcc9670fd3227311e642021-11-25T17:05:36ZGlycerol Hydrogenolysis to Produce 1,2-Propanediol in Absence of Molecular Hydrogen Using a Pd Promoted Cu/MgO/Al<sub>2</sub>O<sub>3</sub> Catalyst10.3390/catal111112992073-4344https://doaj.org/article/82a2be18b8474dcc9670fd3227311e642021-10-01T00:00:00Zhttps://www.mdpi.com/2073-4344/11/11/1299https://doaj.org/toc/2073-4344The catalytic process of glycerol hydrogenolysis to produce 1,2-propandiol (1,2-PD) in the absence of external hydrogen addition has been investigated. The methanol present in the crude glycerol from a biodiesel production process is used to provide in situ hydrogen produced via methanol steam reforming for the glycerol hydrogenolysis process. This process can reduce the additional cost for the transportation and storage of molecular hydrogen and also reduce the safety risks related to using high hydrogen pressure. It was found that the introduction of Pd onto a Cu/MgO/Al<sub>2</sub>O<sub>3</sub> catalyst significantly improved the glycerol conversion and 1,2-PD selectivity. The pseudo-first-order kinetic results suggested that the promoting effect of Pd is primarily attributed to the enhanced activity for the hydrogenation of acetol, which is the intermediate formed via glycerol dehydration. A 2<sup>7−3</sup> fractional factorial design experiment was carried out to investigate the impacts of seven single factors and their binary effects on two responses, namely 1,2-PD selectivity and glycerol conversion. The results showed that the glycerol feed concentration has the most significant effect on the 1,2-PD selectivity, such that the 1,2-PD selectivity is lower if a more concentrated glycerol is used as the feedstock; stirring speed, inert gas pressure and water to methanol molar ratio have insignificant effects on the reaction system. The addition of Pd, higher temperature and higher catalyst loading are the essential factors in order to obtain a high selectivity of 1,2-PD and a high glycerol conversion.Yuanqing LiuMichael WuGarry L. RempelFlora T.T. NgMDPI AGarticleglycerol hydrogenolysisin situ hydrogenmethanol steam reformingacetol hydrogenationPd promoterfactorial designChemical technologyTP1-1185ChemistryQD1-999ENCatalysts, Vol 11, Iss 1299, p 1299 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	glycerol hydrogenolysis in situ hydrogen methanol steam reforming acetol hydrogenation Pd promoter factorial design Chemical technology TP1-1185 Chemistry QD1-999
spellingShingle	glycerol hydrogenolysis in situ hydrogen methanol steam reforming acetol hydrogenation Pd promoter factorial design Chemical technology TP1-1185 Chemistry QD1-999 Yuanqing Liu Michael Wu Garry L. Rempel Flora T.T. Ng Glycerol Hydrogenolysis to Produce 1,2-Propanediol in Absence of Molecular Hydrogen Using a Pd Promoted Cu/MgO/Al<sub>2</sub>O<sub>3</sub> Catalyst
description	The catalytic process of glycerol hydrogenolysis to produce 1,2-propandiol (1,2-PD) in the absence of external hydrogen addition has been investigated. The methanol present in the crude glycerol from a biodiesel production process is used to provide in situ hydrogen produced via methanol steam reforming for the glycerol hydrogenolysis process. This process can reduce the additional cost for the transportation and storage of molecular hydrogen and also reduce the safety risks related to using high hydrogen pressure. It was found that the introduction of Pd onto a Cu/MgO/Al<sub>2</sub>O<sub>3</sub> catalyst significantly improved the glycerol conversion and 1,2-PD selectivity. The pseudo-first-order kinetic results suggested that the promoting effect of Pd is primarily attributed to the enhanced activity for the hydrogenation of acetol, which is the intermediate formed via glycerol dehydration. A 2<sup>7−3</sup> fractional factorial design experiment was carried out to investigate the impacts of seven single factors and their binary effects on two responses, namely 1,2-PD selectivity and glycerol conversion. The results showed that the glycerol feed concentration has the most significant effect on the 1,2-PD selectivity, such that the 1,2-PD selectivity is lower if a more concentrated glycerol is used as the feedstock; stirring speed, inert gas pressure and water to methanol molar ratio have insignificant effects on the reaction system. The addition of Pd, higher temperature and higher catalyst loading are the essential factors in order to obtain a high selectivity of 1,2-PD and a high glycerol conversion.
format	article
author	Yuanqing Liu Michael Wu Garry L. Rempel Flora T.T. Ng
author_facet	Yuanqing Liu Michael Wu Garry L. Rempel Flora T.T. Ng
author_sort	Yuanqing Liu
title	Glycerol Hydrogenolysis to Produce 1,2-Propanediol in Absence of Molecular Hydrogen Using a Pd Promoted Cu/MgO/Al<sub>2</sub>O<sub>3</sub> Catalyst
title_short	Glycerol Hydrogenolysis to Produce 1,2-Propanediol in Absence of Molecular Hydrogen Using a Pd Promoted Cu/MgO/Al<sub>2</sub>O<sub>3</sub> Catalyst
title_full	Glycerol Hydrogenolysis to Produce 1,2-Propanediol in Absence of Molecular Hydrogen Using a Pd Promoted Cu/MgO/Al<sub>2</sub>O<sub>3</sub> Catalyst
title_fullStr	Glycerol Hydrogenolysis to Produce 1,2-Propanediol in Absence of Molecular Hydrogen Using a Pd Promoted Cu/MgO/Al<sub>2</sub>O<sub>3</sub> Catalyst
title_full_unstemmed	Glycerol Hydrogenolysis to Produce 1,2-Propanediol in Absence of Molecular Hydrogen Using a Pd Promoted Cu/MgO/Al<sub>2</sub>O<sub>3</sub> Catalyst
title_sort	glycerol hydrogenolysis to produce 1,2-propanediol in absence of molecular hydrogen using a pd promoted cu/mgo/al<sub>2</sub>o<sub>3</sub> catalyst
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/82a2be18b8474dcc9670fd3227311e64
work_keys_str_mv	AT yuanqingliu glycerolhydrogenolysistoproduce12propanediolinabsenceofmolecularhydrogenusingapdpromotedcumgoalsub2subosub3subcatalyst AT michaelwu glycerolhydrogenolysistoproduce12propanediolinabsenceofmolecularhydrogenusingapdpromotedcumgoalsub2subosub3subcatalyst AT garrylrempel glycerolhydrogenolysistoproduce12propanediolinabsenceofmolecularhydrogenusingapdpromotedcumgoalsub2subosub3subcatalyst AT florattng glycerolhydrogenolysistoproduce12propanediolinabsenceofmolecularhydrogenusingapdpromotedcumgoalsub2subosub3subcatalyst
_version_	1718412723880984576

Glycerol Hydrogenolysis to Produce 1,2-Propanediol in Absence of Molecular Hydrogen Using a Pd Promoted Cu/MgO/Al<sub>2</sub>O<sub>3</sub> Catalyst

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