摘要
利用程序升温氧化(TPO)、程序升温还原(TPR)、NH_3-TPD,结合正丁烷脱氢反应,考察了添加碱金属元素锂以及不同的稀土元素 Y、La、Pr、Nd、Sm、Yb 后,对 Pt/Al_2O_3、Pt-Sn/Al_2O_3高分散负载型催化剂抗积炭性能的影响,发现锂可以明显地调变载体表面的强酸中心,减少载体表面积炭。同时,通过与金属铂的相互作用,也减少了金属表面的积炭。而这几种稀土元素在本实验条件下对催化剂的抗积炭性能影响不大。
The effects of the alkali metal Li and the rare earth elements Y,La,Pr,Nd,Sm,Yb on inhibition of carbon deposition on Pt/Al_2O_3 and Pt-Sn/Al_2O_3 catalysts-have been studied by means of TPO,TPR,NH_3-TPD and n-butane dehydrogena-tion measurements.It has been found that Li can inhibit the formation of carbondeposits on both the metal surface and the support surface of the catalysts.As aresult,Li enhances the activity and the stability of the catalysts,However,the rare,earth elements exert only slight effects upon carbon deposition on the catalysts.
出处
《石油化工》
CAS
CSCD
北大核心
1990年第2期77-82,共6页
Petrochemical Technology
