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The role of Mg(OH)2 in the so-called 'base-free' oxidation of glycerol with AuPd catalysts

Fu, Jile, He, Qian, Miedziak, Peter J., Brett, Gemma Louise, Huang, Xiaoyang, Pattisson, Samuel, Douthwaite, Mark and Hutchings, Graham John 2017. The role of Mg(OH)2 in the so-called 'base-free' oxidation of glycerol with AuPd catalysts. Chemistry - A European Journal 24 (10) , pp. 2396-2402. 10.1002/chem.201704151

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Abstract

Mg(OH)2 and Mg(OH)2 containing materials can provide excellent performance as supports for AuPd nanoparticles for oxidation of glycerol in the absence of base, which is considered to be a result of additional basic sites on the support's surface. However, its influence on the reaction solution is not generally discussed. In this paper, we examine, in detail, the relationship between the basic Mg(OH)2 support and AuPd nanoparticles using four types of catalyst, where the physical interaction between Mg(OH)2 and AuPd was adjusted. It was found that the activity of the AuPd nanoparticles increased with the amount of Mg(OH)2 added under base-free conditions, regardless of its interaction with the noble metals. In order to investigate how Mg(OH)2 affected glycerol oxidation, detailed information about the performance of AuPd/Mg(OH)2, physically mixed (AuPd/C+Mg(OH)2) and (AuPd/C+NaHCO3) was obtained and compared. Furthermore, NaOH and Mg(OH)2 were added during the reaction using AuPd/C. All these results indicate that the distinctive and outstanding performance of Mg(OH)2 supported catalysts in base-free condition is in fact directly related to its ability to affect the pH during the reaction and as such, assists with the initial activation of the primary alcohol which is considered to be the rate determining step in the reactionperformance of Mg(OH)2 supported catalysts in base-free condition could be correlated to its ability to affect the pH during the reaction.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Cardiff Catalysis Institute (CCI)
Publisher: Wiley
ISSN: 0947-6539
Funders: EPSRC
Date of First Compliant Deposit: 3 January 2018
Date of Acceptance: 20 December 2017
Last Modified: 28 Jul 2019 21:31
URI: http://orca-mwe.cf.ac.uk/id/eprint/107862

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