期刊
APPLIED CATALYSIS A-GENERAL
卷 549, 期 -, 页码 289-301出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcata.2017.10.010
关键词
Mn-Ni-Ti solid solution; Selective catalytic reudction; NOx; Competive adsorption; Langmuir-Hinshelwood mechanism
资金
- National Natural Science Foundation of China [21590813]
- National Nature Science Foundation of China [21590813, 21507029, 21501138, 21577012]
- Nature Science Foundation of Hebei Province [B2016502063]
- National Ministry of Science and Technology [2016YFC0204204]
- Open Foundation of Key Laboratory of Industrial Ecology and Environmental Engineering [KLIEEE-15-02]
- China Ministry of Education
- Fundamental Research Funds for the Central Universities [2016MS109]
- Australian Research Council [DP150103026]
We present a tube-shaped Mn-Ni-Ti solid solution for the selective catalytic reduction of NOx with NH3 (NH3-SCR) through a facile self-templated urea-homogeneous precipitation method, which leads to the fine dispersion of the MnOx and NiOx active species in the TiO2 lattice. The ratio of Mn/Ni/Ti is an important factor to affect the crystallinity of Mn-Ni-Ti solid sulotion, and the catalyst with a Mn/Ni/Ti ratio of 2/3/5 (Mn2-Ni3) exhibits the significant structure distortion. The abundant surface defects induce more generation of Mn4+ species, surface adsorbed oxygen and Lewis acid sites, and acclerate the adsorption and activation of NO molecules. The appropriate Mn/Ni ratio inhibits the competitive adsorption of NH3 with NO, and facilitates the Langmuir-Hinshelwood (L-H) mechanism to form N-2, which acts as a much more rapid pathway in comparison to the parallel one following Eley-Rideal (E-R) mechanism. The readily occurence of L-H mechanism significantly improves the SCR performance of catalyst.
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