4.8 Article

Quasi metal organic framework with highly concentrated Cr2O3 molecular clusters as the efficient catalyst for dehydrofluorination of 1,1,1,3,3-pentafluoropropane

Journal

APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 257, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.apcatb.2019.117939

Keywords

Metal organic framework; Cr(2)O3; Molecular cluster; Dehydrofluorination; 1,1,1,3,3-pentafluoropropane

Funding

  1. Zhejiang Provincial Natural Science Foundation of China [LY19B060009]

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Metal-organic frameworks (MOFs) are promising platforms for the application of catalysis with hierarchical porous structures and high surface areas. However, the stability is one of the key challenges for the reactions at elevated temperatures. In the present work, we demonstrate the preparation of Quasi MIL-101 structures with high concentration of Cr2O3 molecular clusters (21.7 wt% 54.2 wt%) via calcination in N-2 atmosphere at temperatures between 350 degrees C and 500 degrees C. Cr2O3 clusters show high activity and stability for the dehydrofluorination of 1,1,1,3,3-pentafluoropropane (HFC-245fa) to 1,3,3,3-tetrafluoropropene (HFO-1234ze). Dehydrofluorination of HFC-245fa is an efficient route for the synthesis of HFO-1234ze. With calcination temperature of 450 degrees C, the reaction rate of Cr2O3 molecular clusters is almost 4 times higher than that of commercial Cr2O3 and no significant deactivation was observed. Therefore, this study provides a competitive strategy for the preparation of molecular clusters catalysts with high thermal stability.

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