Catalytic Activity of High-Surface-Area Amorphous MgO Obtained from Upsalite

The first aim of the research was to synthesize a pure Upsalite, which is an amorphous form of MgCO<sub>3</sub>, by modifying a procedure described in the literature, so that it would be the precursor of a high-surface, amorphous magnesium oxide. The results indicate that within the stud...

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Autores principales:	Marek Gliński, Ewa M. Iwanek (nee Wilczkowska), Urszula Ulkowska, Agnieszka Czajka, Zbigniew Kaszkur
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	high surface magnesium oxide transfer hydrogenation α,β-unsaturated carbonyl compounds Upsalite Chemical technology TP1-1185 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/27a51ae4929844a9b2f56394011f2e46
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spelling	oai:doaj.org-article:27a51ae4929844a9b2f56394011f2e462021-11-25T17:06:03ZCatalytic Activity of High-Surface-Area Amorphous MgO Obtained from Upsalite10.3390/catal111113382073-4344https://doaj.org/article/27a51ae4929844a9b2f56394011f2e462021-11-01T00:00:00Zhttps://www.mdpi.com/2073-4344/11/11/1338https://doaj.org/toc/2073-4344The first aim of the research was to synthesize a pure Upsalite, which is an amorphous form of MgCO<sub>3</sub>, by modifying a procedure described in the literature, so that it would be the precursor of a high-surface, amorphous magnesium oxide. The results indicate that within the studied reaction conditions, the type of alcohol used as the reactant has the most pronounced effect on the yield of reaction. From the two alcohols that led to the highest yield of Upsalite, methanol gave a substantially larger surface area (794 vs. 191 m<sup>2</sup> g<sup>−1</sup>). The optimized synthesis conditions of Upsalite were used to obtain MgO via thermolysis, whose activity in the transfer hydrogenation reaction (THR) from ethanol, 2-propanol and 2-pentanol to various carbonyl compounds was determined. The optimal conditions for the thermolysis were as follows: vacuum, T = 673 K as the final temperature, and a heating rate of 2 deg min<sup>−1</sup>. The high-surface, amorphous magnesia (S<sub>BET</sub> = 488 m<sup>2</sup> g<sup>−1</sup>) was found to be a very selective catalyst to 4-<i>t</i>-butylcyclohexanone in THR, which led to a diastereoselectivity of over 94% to the <i>E</i>-isomer of 4-<i>t</i>-butylcyclohexanol for more than 3 h, with conversions of up to 97% with either 2-propanol or 2-pentanol as the hydrogen donor. In the case of acrolein and 2-<i>n</i>-propylacrolein being used as the hydrogen acceptors, the unsaturated alcohol (UOL) was the main product of the reaction, with higher UOL yields noted for ethanol than 2-propanol.Marek GlińskiEwa M. Iwanek (nee Wilczkowska)Urszula UlkowskaAgnieszka CzajkaZbigniew KaszkurMDPI AGarticlehigh surface magnesium oxidetransfer hydrogenationα,β-unsaturated carbonyl compoundsUpsaliteChemical technologyTP1-1185ChemistryQD1-999ENCatalysts, Vol 11, Iss 1338, p 1338 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	high surface magnesium oxide transfer hydrogenation α,β-unsaturated carbonyl compounds Upsalite Chemical technology TP1-1185 Chemistry QD1-999
spellingShingle	high surface magnesium oxide transfer hydrogenation α,β-unsaturated carbonyl compounds Upsalite Chemical technology TP1-1185 Chemistry QD1-999 Marek Gliński Ewa M. Iwanek (nee Wilczkowska) Urszula Ulkowska Agnieszka Czajka Zbigniew Kaszkur Catalytic Activity of High-Surface-Area Amorphous MgO Obtained from Upsalite
description	The first aim of the research was to synthesize a pure Upsalite, which is an amorphous form of MgCO<sub>3</sub>, by modifying a procedure described in the literature, so that it would be the precursor of a high-surface, amorphous magnesium oxide. The results indicate that within the studied reaction conditions, the type of alcohol used as the reactant has the most pronounced effect on the yield of reaction. From the two alcohols that led to the highest yield of Upsalite, methanol gave a substantially larger surface area (794 vs. 191 m<sup>2</sup> g<sup>−1</sup>). The optimized synthesis conditions of Upsalite were used to obtain MgO via thermolysis, whose activity in the transfer hydrogenation reaction (THR) from ethanol, 2-propanol and 2-pentanol to various carbonyl compounds was determined. The optimal conditions for the thermolysis were as follows: vacuum, T = 673 K as the final temperature, and a heating rate of 2 deg min<sup>−1</sup>. The high-surface, amorphous magnesia (S<sub>BET</sub> = 488 m<sup>2</sup> g<sup>−1</sup>) was found to be a very selective catalyst to 4-<i>t</i>-butylcyclohexanone in THR, which led to a diastereoselectivity of over 94% to the <i>E</i>-isomer of 4-<i>t</i>-butylcyclohexanol for more than 3 h, with conversions of up to 97% with either 2-propanol or 2-pentanol as the hydrogen donor. In the case of acrolein and 2-<i>n</i>-propylacrolein being used as the hydrogen acceptors, the unsaturated alcohol (UOL) was the main product of the reaction, with higher UOL yields noted for ethanol than 2-propanol.
format	article
author	Marek Gliński Ewa M. Iwanek (nee Wilczkowska) Urszula Ulkowska Agnieszka Czajka Zbigniew Kaszkur
author_facet	Marek Gliński Ewa M. Iwanek (nee Wilczkowska) Urszula Ulkowska Agnieszka Czajka Zbigniew Kaszkur
author_sort	Marek Gliński
title	Catalytic Activity of High-Surface-Area Amorphous MgO Obtained from Upsalite
title_short	Catalytic Activity of High-Surface-Area Amorphous MgO Obtained from Upsalite
title_full	Catalytic Activity of High-Surface-Area Amorphous MgO Obtained from Upsalite
title_fullStr	Catalytic Activity of High-Surface-Area Amorphous MgO Obtained from Upsalite
title_full_unstemmed	Catalytic Activity of High-Surface-Area Amorphous MgO Obtained from Upsalite
title_sort	catalytic activity of high-surface-area amorphous mgo obtained from upsalite
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/27a51ae4929844a9b2f56394011f2e46
work_keys_str_mv	AT marekglinski catalyticactivityofhighsurfaceareaamorphousmgoobtainedfromupsalite AT ewamiwanekneewilczkowska catalyticactivityofhighsurfaceareaamorphousmgoobtainedfromupsalite AT urszulaulkowska catalyticactivityofhighsurfaceareaamorphousmgoobtainedfromupsalite AT agnieszkaczajka catalyticactivityofhighsurfaceareaamorphousmgoobtainedfromupsalite AT zbigniewkaszkur catalyticactivityofhighsurfaceareaamorphousmgoobtainedfromupsalite
_version_	1718412702322262016

Catalytic Activity of High-Surface-Area Amorphous MgO Obtained from Upsalite

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