4.7 Article

Amorphous manganese oxide as highly active catalyst for soot oxidation

期刊

ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
卷 27, 期 12, 页码 13488-13500

出版社

SPRINGER HEIDELBERG
DOI: 10.1007/s11356-020-07909-y

关键词

Amorphous and crystal MnOx; Soot oxidation; Mesoporous; Catalytic activity

资金

  1. National Natural Science Foundation of China [21777055]
  2. Key Technology Research and Development Program of Shandong Province [2019GSF109116, 2018GGX102032]
  3. Natural Science Foundation of Shandong Province [ZR2018LB026, ZR2017BB004]
  4. Major Science and Technology Innovation Projects of Shandong Province [2017CXGC1004]

向作者/读者索取更多资源

A series of highly active amorphous manganese oxide catalysts for soot combustion were synthesized using colloidal solution combustion synthesis (CSCS) method. The surface morphological and structural properties were systematically tested via various techniques: X-ray diffraction, N-2 adsorption-desorption, temperature-programmed reduction, scanning electron microscopy, and X-ray photoelectron spectroscopy. Manganese precursors and calcination temperatures affect the crystal structure, redox properties, and surface properties of MnOx. With the calcination temperature increasing from 550 to 850 degrees C, the crystalline structure of manganese oxides changed from amorphous phase to crystal phase. In general, the amorphous MnOx with a hierarchical porous structure showed better catalytic activity for soot oxidation than the crystal ones (T-10 as indicator), which can be ascribed to the improved low-temperature reducibility, more surface active oxygen species, and abundant surface Mn4+ ions. The presence of NO in O-2 also promoted soot oxidation which follows the NO2-assisted mechanism. Our work may provide a rational comparison between high-efficient amorphous and crystal MnOx catalysts for soot oxidation.

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