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A General Synthesis Strategy for Highly Dispersed Amorphous MoO 3 over Supported Catalysts
Author(s) -
Dai Zhichao,
Xu Shengqiang,
Guo Lijuan,
Huang Qingming,
Hu Hui,
Chen Xiaohui
Publication year - 2016
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201600243
Subject(s) - coprecipitation , x ray photoelectron spectroscopy , catalysis , amorphous solid , materials science , transmission electron microscopy , desorption , analytical chemistry (journal) , adsorption , chemical engineering , inorganic chemistry , crystallography , chemistry , nanotechnology , organic chemistry , engineering
Abstract Amorphous MoO 3 was evenly deposited on a Bi 2 SiO 5 /SiO 2 support by a strategy of heterogenous coprecipitation using Ti as structural promoter. The structure and properties of MoO 3 ‐Bi 2 SiO 5 /SiO 2 have been characterized by a series of techniques, including N 2 adsorption/desorption analysis, X‐ray diffraction (XRD), transmission electron microscopy (TEM), X‐ray photoelectron spectroscopy (XPS) and ultraviolet‐visible light (UV‐vis) diffuse reflectance spectra (DRS).The addition of n‐butyl alcohol into synthesis medium resulted in the most dispersive amorphous MoO 3 , with an average particle size of 4 nm. Selective oxidation of propylene was chosen as a probe reaction to test the performance of catalysts. Kinetic study revealed that the method of heterogeneous coprecipitation enhanced catalytic performance via increasing the number of active sites, rather than changing the nature of it. This is well compatible with characterization results.