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Insight into the efficient oxidation of methyl-ethyl-ketone over hierarchically micro-mesostructured Pt/K-(Al)SiO 2 nanorod catalysts: Structure-activity relationships and mechanism

Jiang, Zeyu, He, Chi, Dummer, Nicholas Frank, Shi, Jianwen, Tian, Mingjiao, Ma, Chunyan, Hao, Zhengping, Taylor, Stuart Hamilton, Ma, Mudi and Shen, Zhenxing 2018. Insight into the efficient oxidation of methyl-ethyl-ketone over hierarchically micro-mesostructured Pt/K-(Al)SiO 2 nanorod catalysts: Structure-activity relationships and mechanism. Applied Catalysis B: Environmental 226 , pp. 220-233. 10.1016/j.apcatb.2017.12.007

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Abstract

Hierarchically micro-mesostructured Pt/K-Al-SiO2 catalysts with regular nanorod (Pt/KA-NRS) and spherical nanoflower-like (Pt/KA-SNFS) morphologies were prepared. The existence of Al atoms generates Brønsted acid sites and reduces silanol groups over the supports, promoting the dispersion of Pt nanoparticles and stability of catalysts. Potassium atoms balance the negative charge of supports and enhance O2 mobility. The Pt/KA-NRS catalysts exhibit unexceptionable low temperature activity, CO2 selectivity, and stability for MEK oxidation. Amongst, 0.27 wt.% Pt/KA-NRS completely converts MEK at just 170 °C (activation energy as low as 37.22 kJ·mol−1), more than 100 °C lower than other typical Pt/Pd supported catalysts reported in the literature. Diacetyl and 2,3-butandiol are the main intermediates during MEK activation, which convert into H2O and CO2 through aldehydes and acids. The excellent catalytic activity of Pt/KA-NRS is ascribed to their regular morphology, high Pt0 content and dispersion, excellent MEK adsorption capacity and superior O2/CO2 desorption capability under low temperature.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Cardiff Catalysis Institute (CCI)
Chemistry
Publisher: Elsevier
ISSN: 0926-3373
Date of First Compliant Deposit: 29 March 2018
Date of Acceptance: 4 December 2017
Last Modified: 29 Jun 2019 17:48
URI: http://orca.cf.ac.uk/id/eprint/110331

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