Journal
ACS CATALYSIS
Volume 4, Issue 6, Pages 1753-1763Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cs401185c
Keywords
DeNO(x) catalysts; SCR; hierarchically; nanocage; MOFs
Categories
Funding
- National Natural Science Foundation of China [51108258]
- Doctoral Fund of Ministry of Education of China [20123108120018]
- Science and Technology Commission of Shanghai Municipality [13NM1401200, 11NM0502200]
- Dongguan Municipal Research Program for Colleges and Institutes [201210825000535]
- Shanghai First-Class Discipline Construction in Colleges and Universities
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Herein, we have rationally designed and originally developed a high-performance deNO(x) catalyst based on hollow porous MnxCo3-xO4 nanocages with a spinel structure thermally derived from nanocube-like metal organic frameworks (Mn-3[Co(CN)(6)](2)center dot nH(2)O), which are synthesized via a self-assemble method. The as-prepared catalysts have been characterized systematically to elucidate their morphological structure and surface properties. As compared with conventional MnxCo3-xO4 nanoparticles, MnxCo3-xO4 nanocages possess a much better catalytic activity at low-temperature regions, higher N-2 selectivity, more extensive operating-temperature window, higher stability, and SO2 tolerance. The feature of hollow and porous structures provides a larger surface area and more active sites to adsorb and activate reaction gases, resulting in the high catalytic activity. Moreover, the uniform distribution and strong interaction of manganese and cobalt oxide species not only enhance the catalytic cycle but also inhibit the formation of manganese sulfate, resulting in high catalytic cycle stability and good SO2 tolerance. In light of the various characterization results, the excellent deNO(x) performance of MnxCo3-xO4 nanocages can be attributed to the hollow and porous structures, the uniform distribution of active sites, as well as the strong interaction of manganese and cobalt oxide species. The excellent catalytic performance suggests that MnxCo3-xO4 nanocages are promising candidates for low-temperature deNO(x) catalysts. More importantly, the present study indicates that the hollow porous architectures and well-dispersed active components can effectively enhance the performance of catalysts.
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