Zhang Changbin, He Hong, Shuai Shijin, Wang Jianxin
State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, China.
Environ Pollut. 2007 May;147(2):415-21. doi: 10.1016/j.envpol.2006.05.030. Epub 2006 Jul 7.
The selective catalytic reduction (SCR) of NOx by C(2)H(5)OH was studied in excess oxygen over Ag/Al(2)O(3) catalysts with different Ag loadings at lab conditions. The 4% Ag/Al(2)O(3) has the highest activity for the C(2)H(5)OH-SCR of NOx with a drawback of simultaneously producing CO and unburned THC in effluent gases. An oxidation catalyst 10% Cu/Al(2)O(3) was directly placed after the Ag/Al(2)O(3) to remove CO and unburned THC. Washcoated honeycomb catalysts were prepared based on the 4% Ag/Al(2)O(3) and 10% Cu/Al(2)O(3) powders and tested for the C(2)H(5)OH-SCR of NOx on a diesel engine at the practical operating conditions. Compared with the Ag/Al(2)O(3) powder, the Ag/Al(2)O(3) washcoated honeycomb catalyst (SCR catalyst) has a similar activity for NOx reduction by C(2)H(5)OH and the drawback of increasing the CO and unburned THC emissions. Using the SCR+Oxi composite catalyst with the optimization of C(2)H(5)OH addition, the diesel engine completely meets EURO III emission standards.
在实验室条件下，研究了在过量氧气存在下，不同银负载量的Ag/Al₂O₃催化剂上乙醇（C₂H₅OH）对氮氧化物（NOx）的选择性催化还原（SCR）。4% Ag/Al₂O₃对乙醇-SCR脱硝反应具有最高活性，但其缺点是尾气中会同时产生一氧化碳（CO）和未燃烧的总碳氢化合物（THC）。在Ag/Al₂O₃之后直接放置一种氧化催化剂10% Cu/Al₂O₃以去除CO和未燃烧的THC。基于4% Ag/Al₂O₃和10% Cu/Al₂O₃粉末制备了涂覆有催化涂层的蜂窝状催化剂，并在实际运行条件下对其在柴油发动机上进行乙醇-SCR脱硝测试。与Ag/Al₂O₃粉末相比，涂覆有催化涂层的Ag/Al₂O₃蜂窝状催化剂（SCR催化剂）对乙醇还原NOx具有相似的活性，且存在增加CO和未燃烧THC排放的缺点。通过优化乙醇添加量使用SCR+Oxi复合催化剂，柴油发动机完全符合欧Ⅲ排放标准。
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