CAJ | 학술논문

用XPS和TPR谱学表征方法，研究钾助剂对负载型Co-Mo-K-O/γ-Al2O3水煤气耐硫变换催化剂的作用.XPS表征显示，硫化态催化剂随着钾添加量的增加，低价态钼和S2-增加，（S-S）2-受抑制，(Mo4++Mo5+)/Mo6+质量比为0.8～1和较多的S2-物种有利于提高催化剂的低温活性.TPR表征结果示出，硫化态及工作态催化剂皆出现α、β2个吸氢峰，可分别归属Mo6+→Mo5+和Mo5+→Mon+（n=4,3,2)的还原过程；工作态催化剂α峰峰温较硫化态低，β峰为宽峰带低价钼混合峰；吸氢峰的大小与催化剂低温活性密切相关.
용XPS화TPR보학표정방법，연구갑조제대부재형Co-Mo-K-O/γ-Al2O3수매기내류변환최화제적작용.XPS표정현시，류화태최화제수착갑첨가량적증가，저개태목화S2-증가，（S-S）2-수억제，(Mo4++Mo5+)/Mo6+질량비위0.8～1화교다적S2-물충유리우제고최화제적저온활성.TPR표정결과시출，류화태급공작태최화제개출현α、β2개흡경봉，가분별귀속Mo6+→Mo5+화Mo5+→Mon+（n=4,3,2)적환원과정；공작태최화제α봉봉온교류화태저，β봉위관봉대저개목혼합봉；흡경봉적대소여최화제저온활성밀절상관.
The XPS, TPR techniques were used to study the promotion effectof K2CO3 to the supported catalyst Co-Mo-K-O/γ-Al2O3 for water gas shift. The XPS results show that the amount of low valence molybdenum and S2- increases with increase of the content of K in sulfured catalyst, and (S-S)2- is suppressed. It is found that keeping the ratio (Mo4++Mo5+)/Mo6+ at 0.8～1 level and remaining more S2- species on the catalyst are in favor of the improvement of the catalytic activity at low temperature. Two hydrogen-adsorped peaks of TPR, namely α and β peaks, which can be ascribed to Mo6+→Mo5+ and Mo5+→Mon+(n=4,3,2) reduction processes respectively, appear both at sulfured state and functioning state. The experiment results indicate that there is a close relation between the altitude of the peaks and the activity of the catalyst at low temperature.