摘要
研究了CuO-ZnO-ZrO_2催化剂在CO_2加H_2合成甲醇反应中的催化活性。运用TPR、XRD、BET、XPS、IR等测试技术对ZrO_2的作用、催化剂的性能及反应的中间物种进行了深入探讨。ZrO_2的加入有助于提高活性组分的分散度和增加催化剂表面积。加入适量ZrO_2可大大提高催化剂活性和甲醇选择性。ZrO_2含量和焙烧温度直接影响着CuO分布和催化剂活性。研究发现,Cu^0与ZnO共同构成反应的活性中心,且反应过程中,催化剂表面有M—OH等中间物种的生成,认为是合成甲醇反应的中间物种。作者还对反应机理进行了进一步探讨。
The activities of CuO-ZnO-ZrO_2 catalysts for methanol synthesis from carbon dioxide with hydrogen have been studied. TPR,XRD,BET,XPS and IR were used to examine the effect of ZrO_2, properties of catalysts and the reaction intermediates on the surface of catalysts. The adding of ZrO_2 was helpful for increasing the dispersion degree of active component and the surface area of catalyst. A suitable amount of ZrO_2 would enhance the catalytic activity and methanol selectivity highly. The content of ZrO_2 and the calcination temperature for catalyst might directly affect the dispersion of CuO and activities of catalysts. It was found that Cu^0 with ZnO formed the reaction active sites together. The M-OH and (?) reaction intermediates on the surface of catalyst were observed and they were thought as major intermediates of methanol synthesis from carbon dioxide and hydrogen. The reaction mechanism was further discussed too.
出处
《天然气化工—C1化学与化工》
CAS
CSCD
北大核心
1993年第4期3-8,共6页
Natural Gas Chemical Industry
关键词
氧化锆
甲醇
合成
催化剂
活性
lower pressure
metanol synthesis
catalyst property
zirconium oxide
carbon dioxide
hydrogen
active site