轻油预转化催化剂的还原性和表面性能考察

Investigation on Reducibility and Surface Characteristics of the Naphtha Prereforming Catalyst

本文利用ＴＰＲ、Ｈ＿２脉冲吸附和ＴＰＤ的方法，对轻油预转化催化剂ＣＮ－１４和Ｇ１－８０进行了还原性考察和表面性能研究。ＴＰＲ实验结果表明，２种催化剂的微分还原曲线均存在３个大小不同的还原峰，它们分别对应于３种不同状态的ＮｉＯ，３种ＮｉＯ的相对含量有较大差异，改变制备方法或预处理条件，可使不同状态ＮｉＯ含量得到改变。吸附－ＴＰＤ实验表明，Ｇｌ－８０催化剂经运转后，Ｎｉ表面积减少约３４％；经运转后的ＣＮ－１４催化剂，其Ｎｉ表面积不仅未减少，反而增大了１１％左右，其活性稳定性最好。实验还表明，在４５０℃下，催化剂上起催化作用的主要是低温活性中心。

his paper investigates the reducivility and surface characteristics of the naphtlia prereforming catalyst CN-14 andG 180 with fnethfor of TPR, H_2 Pulse Abeorb and TPD.The result of TPR indicates that for both two kinds of catalysts,there are three different sized reduction poks on the differential reduction line,each corresponding to three differentkinds of NiO.the content of each NiO is much more different,and their contents can be changed through different prepa-ring method and pretreating conditions. The Atherb and TPD test indicates that the Ni surface area of G1-80 loses about34 % after oporation,but CN-14,on the other hand ,taises abeut 11% ,thus its active stability is the bet.The tests alsoindicates that at the temperature lower than 450℃,the catalytic active on the catalyst is mainly the low temperature ac-tive center.