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用共沉淀法制备了 n( Au) / n( Zn O) =1 .3 / 1 0 0的催化剂 .考察了焙烧温度对 Au/ Zn O催化剂的化学组成及 CO氧化性能的影响 .结果表明 ,焙烧温度对催化剂的化学组成、活性和稳定性均有较大影响 ,其中2 4 0℃焙烧制得的 Au/ Zn O催化剂稳定性最好 ,在 2 5℃和进料中含有水分的条件下 ,可连续反应 60 0 h使CO完全转化 .XRD,FTIR,TG-DTA,TEM及 UV-Vis结果表明 ,金粒子高度分散在氧化锌或碳酸锌上 ,平均直径 2～ 5nm.催化剂的稳定性同锌物种有关 ,氧化锌较碳酸锌表现出较好的稳定性 ,且氧化锌粒子越小 ,比表面积越大 ,催化剂的稳定性越高 .
The effect of calcination temperature on the chemical composition and CO oxidation performance of Au / Zn O catalysts was investigated by coprecipitation method. The calcination temperature has a great influence on the chemical composition, activity and stability of the catalyst. The Au / Zn O catalyst prepared by calcination at 240 ℃ has the best stability. Under the conditions of 25 ℃ and moisture in the feed , Which can be completely transformed by 60 0 h continuous reaction.The results of XRD, FTIR, TG-DTA, TEM and UV-Vis show that the gold particles are highly dispersed on zinc oxide or zinc carbonate with an average diameter of 2 ~ 5 nm. The stability of the catalyst With the zinc species, zinc oxide than zinc carbonate showed good stability, and the smaller the zinc oxide particles, the greater the specific surface area, the higher the stability of the catalyst.