Effect of dispersion and distribution of tungsten on W/HZSM-5 for selective catalytic reduction of NO by acetylene |
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Authors: | Ran Bi Xinping Wang Zhiguang Liu Jing Chen |
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Institution: | State Key Laboratory, of Fine Chemicals, Dalian University of Technology, Dalian 116024, Liaoning, China |
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Abstract: | Catalytic performance of W/HZSM-5 in selective catalytic reduction of NO by acetylene was investigated in a reaction system with 1600 ppm of NO, 800 ppm of C2H2, and 9.95% of O2 in He. It was found that promotional effect of tungsten on the reaction is strongly affected by catalyst preparation conditions and Si/AI ratio of the parent zeolite. A better dispersion of tungsten on HZSM-5 and relatively more monomeric tungsten species were found on 8%W/HZSM-5 prepared by impregnation of the zeolite with lower SiO2/Al2O3 ratio (25) in ammonic ammonium tungstate solution and calcination of the resulting material at higher temperature (550 ℃). The highest NO conversion to N2 of 86.3% in the reaction system was obtained at 350 ℃ over the catalyst thus prepared. The mechanism of monomeric tungsten species improving the C2H2-SCR can be attributed to accelerating the formation of active nitrate species. |
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Keywords: | nitric oxide selective catalytic reduction tungsten HZSM-5 |
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