中文摘要：

采用浸渍法制备了双组分Co-Zn／H-beta催化剂，考察了其在富氧（4%）和高空速（20000h-1）条件下丙烷选择性催化还原NQ的性能。结果表明，双组分Co-Zn／H-beta催化剂催化活性高于单组分Co／H-beta和Zn/H—beta的催化活性。在20000h^-1的高空速条件下，Co-Zn／H-beta催化剂在723K时NOx转化率达到最高值95％。Co-Zn／H-beta催化剂中Zn的作用是抑制丙烷的燃烧反应，Co的作用是促进NO的氧化反应。高空速范围内（10000-100000h^-1），空速对Co-Zn／H-beta催化剂活性的影响不大，在Co-Zn／H-beta催化剂上丙烷能有效地消除NOx。

英文摘要：

In order to improve the catalytic activity of Co-based catalysts for the selective catalytic reduction （SCR） of NOx by C3H8 at high gas hourly space velocity （GHSV）, the Co/H-beta catalyst was modified by Zn, and the bimetal Co-Zn / H-beta catalyst was prepared by impregnation method; its property of SCR for NOx reduction by C3H8 in the presence of excess oxygen and at high GHSV range of 10000-100000 h^-1 was investigated. The results show that the catalytic activity of the prepared bimetal Co-Zn / H-beta catalyst is higher than that of single metal Co / H-beta and Zn / H-beta catalysts, and the maximum NOx conversion ratio of about 95% over the Co-Zn / H-beta catalyst can be reach at 723 K and 20000 h^-1. It was considered that there exists cooperative effect between the Zn and Co in Co-Zn / H-beta catalyst; the oxidation of C3H8 is inhibited effectively by Zn addition, and the NO oxidation to NO2 is enhanced by Co. The prepared Co-Zn / H-beta catalyst shows high activity at high GHSV, and its catalytic NOx conversion ratio almost does not change when the GHSV is in the range of 10000-100000 h^-1.