Mesoporous chromia with ordered three-dimensional structures for the complete oxidation of toluene and ethyl acetate

Environmental Science & Technology
Yunsheng XiaChak Tong Au

Abstract

Mesoporous chromia with ordered three-dimensional (3D) hexagonal polycrystalline structures were fabricated at 130, 180, 240, 280, and 350 degrees C in an autoclave through a novel solvent-free route using KIT-6 as the hard template. The as-obtained materials were characterized (by means of X-ray diffraction, transmission electron microscopy, N(2) adsorption-desorption, temperature-programmed reduction, and X-ray photoelectron spectroscopy techniques) and tested as a catalyst for the complete oxidation of toluene and ethyl acetate. We found that with a high surface area of 106 m(2)/g and being multivalent (Cr(3+), Cr(5+), and Cr(6+)), the chromia (meso-Cr-240) fabricated at 240 degrees C is the best among the five in catalytic performance. According to the results of the temperature-programmed reduction and X-ray photoelectron spectroscopy investigations, it is apparent that the coexistence of multiple chromium species promotes the low-temperature reducibility of chromia. The excellent performance of meso-Cr-240 is because of good 3D mesoporosity and low-temperature reducibility as well as the high surface area of the chromia. The combustion follows a first-order reaction with respect to toluene or ethyl acetate in the presence...Continue Reading

Citations

Jul 22, 2020·Chemical Society Reviews·Liping Zhang, Mietek Jaroniec
Aug 15, 2013·Chemical Society Reviews·Dong Gu, Ferdi Schüth
Mar 4, 2019·Environmental Science and Pollution Research International·Mudi WuWenguo Xiang
Jul 25, 2018·Environmental Science & Technology·Zong HuWangcheng Zhan
May 10, 2017·ACS Applied Materials & Interfaces·Chang DingWangchang Geng

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