引用本文:
林仁存, 杨意泉, 袁友珠, 魏光, 王琪, 樊金红, 戴深峻. 钾促进钴钼耐硫CO变换催化剂的XPS和TPR表征[J]. 应用化学,
2001, 18(1): 25-28.
Citation: LIN Ren-Cun, YANG Yi-Quan, YUAN You-Zhu, WEI Guang, WANG Qi, FAN Jin-Hong, DAI Shen-Jun. The XPS and TPR Characterization of Sulfur-resisted Catalysts for Water Gas Shift Promoted by K2CO3[J]. Chinese Journal of Applied Chemistry, 2001, 18(1): 25-28.
Citation: LIN Ren-Cun, YANG Yi-Quan, YUAN You-Zhu, WEI Guang, WANG Qi, FAN Jin-Hong, DAI Shen-Jun. The XPS and TPR Characterization of Sulfur-resisted Catalysts for Water Gas Shift Promoted by K2CO3[J]. Chinese Journal of Applied Chemistry, 2001, 18(1): 25-28.
钾促进钴钼耐硫CO变换催化剂的XPS和TPR表征
摘要:
用XPS和TPR谱学表征方法,研究钾助剂对负载型Co-Mo-K-O/V-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T、U2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T峰峰温较硫化态低,U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.
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关键词:
- Co-Mo/Al2O3催化剂
- / 钾助剂
- / 水煤气变换
English
The XPS and TPR Characterization of Sulfur-resisted Catalysts for Water Gas Shift Promoted by K2CO3
Abstract:
The XPS, TPR techniques were used to study the promotion effect of K2CO3 to the supported catalyst Co-Mo-K-O/V-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 T and U 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.
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Key words:
- Co Mo/Al2O3 catalyst
- / K2CO3 promoter
- / water gas shift
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