摘要
利用原位红外光谱技术分别对CO在钯金属催化剂及其载体上的吸附性能进行了研究。发现CO在催化剂载体上也存在表面吸附态 ,吸附峰随温度的升高而变化 ,其中HCOO-吸附态比较稳定。CO在催化剂活性中心上存在两种吸附态 :桥式吸附态和线式吸附态 ,桥式吸附态比线式吸附态稳定 ,且CO吸附量随温度的升高而增大。由于载体的部分表面被Pd所覆盖 ,导致了CO在催化剂载体部分的吸附量减少。实验还测定了氢气对CO在催化剂上吸附性能的影响 ,发现氢气会影响CO在催化剂活性中心及载体上的吸附。
Adsorption of CO on bare support alumina and supported Pd catalyst has been studied by infrared spectroscopy respectively. The results showed that there are two kinds of adsorbed CO forms on the supported Pd catalyst: the linear complex and the bridge complex. The latter is more stable than the former state. Adsorbed CO on support alumina of Pd/Al 2O 3 catalyst was found to be weakened compared with the adsorbed CO on the bare alumina support because some part of the support was covered by Pd. The IR spectra of CO adsorption after introducing hydrogen were measured. It was found that hydrogen affect not only the adsorption behavior of CO on the active site, but the adsorption behavior of CO on the support.
出处
《天然气化工—C1化学与化工》
CAS
CSCD
北大核心
2002年第6期25-28,共4页
Natural Gas Chemical Industry
基金
国家"九五"科技攻关项目
项目编号 :96 - 5 39- 0 1
