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NOx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。
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.
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2009年第2期236-239,共4页
Journal of Chemical Engineering of Chinese Universities
基金
国家自然科学基金项目(20476095)
