Title: Heteropolyacid encapsulated in Cu-3(BTC)(2) nanocrystals: An effective esterification catalyst
Authors: Wee, Lik Hong ×
Janssens, Nikki
Bajpe, Sneha
Kirschhock, Christine
Martens, Johan #
Issue Date: Aug-2011
Publisher: Elsevier Science Publishers
Series Title: Catalysis Today vol:171 issue:1 pages:275-280
Abstract: An original synthesis approach to prepare Cu-3(BTC)(2) (BTC = benzene tricarboxylic acid) encapsulated Keggin phosphotungstic acid (HPW) [HPW/Cu-3(BTC)(2)] involving mixing of reagents at room temperature, quenching in liquid nitrogen and freeze drying has resulted in the formation of nanocrystals. The catalytic properties of the as-synthesized nanocrystalline materials were assessed using a model esterification reaction of acetic acid with 1-propanol. HPW/Cu-3(BTC)(2) catalyst is partially dissolved in presence of acetic acid. In the esterification reaction the molar ratio of acetic acid to 1-propanol is critical. At high molar ratio of acetic acid to 1-propanol (1:2) leaching of Cu2+ and HPW was observed. However, at low molar ratio of acetic acid to 1-propanol (1:40) leaching of Cu2+ and HPW could be prevented and the catalyst was stable. Nanosized HPW/Cu-3(BTC)(2) showed higher catalytic activity compared to micron-size Cu-3(BTC)(2) (HKUST-1), ultrastable Y zeolite and micron-sized HPW/Cu-3(BTC)(2) catalysts. The stability of the nanosized MOF catalyst in acidic reaction medium after esterification reaction was investigated by powder X-ray diffraction (PXRD), scanning electron microscope (SEM) and N-2 adsorption. (C) 2011 Elsevier B.V. All rights reserved.
ISSN: 0920-5861
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Centre for Surface Chemistry and Catalysis
× corresponding author
# (joint) last author

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