TY - JOUR
T1 - Crystal Facets Make a Profound Difference in Polyoxometalate-Containing Metal-Organic Frameworks as Catalysts for Biodiesel Production
AU - Liu, Yiwei
AU - Liu, Shumei
AU - He, Danfeng
AU - Li, Ning
AU - Ji, Yujuan
AU - Zheng, Zhiping
AU - Luo, Fang
AU - Liu, Shuxia
AU - Shi, Zhan
AU - Hu, Changwen
N1 - Publisher Copyright:
© 2015 American Chemical Society.
PY - 2015/10/7
Y1 - 2015/10/7
N2 - An inherent challenge in using metal-organic frameworks (MOFs) for catalysis is how to access the catalytic sites generally confined inside the porous structure, in particular for substrates larger than the pores. We present here a promising solution to bypass this roadblock by modulating the facets of a crystalline MOF NENU-3a to enhance the facet exposure of the catalytic sites and the adsorption of substrates. Specifically, by transforming it with encapsulated catalysis-responsible polyoxometalate from octahedron characterized entirely by {111} facets to cube with only {100} facets, much enhanced catalytic activities were observed, especially for sterically demanding substrates that are otherwise hard to diffuse into the pores. Crystallographic analysis and adsorption/desorption experiments collectively established the critical effects of morphological control on the enhanced catalysis. The cubic crystals were then applied for biodiesel production, reaching more than 90% conversion of fatty acids (C12-C22) in comparison to <22% using octahedral crystals.
AB - An inherent challenge in using metal-organic frameworks (MOFs) for catalysis is how to access the catalytic sites generally confined inside the porous structure, in particular for substrates larger than the pores. We present here a promising solution to bypass this roadblock by modulating the facets of a crystalline MOF NENU-3a to enhance the facet exposure of the catalytic sites and the adsorption of substrates. Specifically, by transforming it with encapsulated catalysis-responsible polyoxometalate from octahedron characterized entirely by {111} facets to cube with only {100} facets, much enhanced catalytic activities were observed, especially for sterically demanding substrates that are otherwise hard to diffuse into the pores. Crystallographic analysis and adsorption/desorption experiments collectively established the critical effects of morphological control on the enhanced catalysis. The cubic crystals were then applied for biodiesel production, reaching more than 90% conversion of fatty acids (C12-C22) in comparison to <22% using octahedral crystals.
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U2 - 10.1021/jacs.5b08273
DO - 10.1021/jacs.5b08273
M3 - Article
C2 - 26387862
AN - SCOPUS:84943579397
VL - 137
SP - 12697
EP - 12703
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
SN - 0002-7863
IS - 39
ER -