Cu-Zn催化剂的CO水汽变换反应特性  

CO water-gas-shift reaction character over Cu-Zn catalyst

作　　者：米万良[1] 孙丹杰[1] 龚娟[1] 苏庆泉[1] 贾冬梅[2] 

机构地区：[1]北京科技大学机械工程学院,北京100083 [2]中国化工信息中心,北京100029

出　　处：《北京科技大学学报》2010年第2期224-229,共6页Journal of University of Science and Technology Beijing

基　　金：国家自然科学基金资助项目(No.20776016)

摘　　要：通过考察不同条件下烧结对Cu-Zn和Fe-Cr催化剂变换反应性能的影响,并结合催化剂的化学吸附表征手段,探讨了用Cu-Zn系催化剂替代Fe-Cr系催化剂作为高变催化剂的可行性.活性评价结果表明,从初期活性来看,Cu-Zn系催化剂不仅在低变温度,而且在高变温度下也优于Fe-Cr系催化剂;从催化剂的烧结特性来看,Cu-Zn系催化剂虽然在450℃的高温烧结条件下于初期阶段烧结明显,但500h之后逐渐趋于稳定,稳定后的活性仍优于Fe-Cr系催化剂.活性评价结果与CO化学吸附量测试结果相吻合.据此提出了不使用Fe-Cr系催化剂,在高、低温变换过程均使用Cu-Zn系催化剂的CO变换工艺,可将入口体积分数10%的CO去除到1%以下.The effect of sintering on the performance of two kinds of catalysts was analyzed under various conditions,and chemisorption characterization of catalysts was carried out to investigate the feasibility of substituting Cu-Zn catalyst for Fe-Cr catalyst in high temperature CO water-gas shift process （HTS）.Results of activity evaluation experiments show that as a fresh catalyst,Cu-Zn catalyst has a higher activity than Fe-Cr catalyst,not only in the temperature range of low temperature shift （LTS）,but also in the temperature range of HTS.On the other hand,sintering of Cu-Zn catalyst is obvious in the beginning stage at a relative high temperature of 450℃,but gets steady after 500 h,and in the steady stage the activity of Cu-Zn catalyst is still higher than that of Fe-Cr catalyst.The results of activity evaluation accord with those of CO chemical sorption.A CO water-gas shift process with substituting Cu-Zn catalyst for Fe-Cr catalyst was suggested in both HTS and LTS processes,in which the CO content could be removed to below 1% from the inlet content of 10%.

关 键 词：燃料电池 Cu-Zn系催化剂 Fe-Cr系催化剂 烧结 

分 类 号：TQ116.25[化学工程—无机化工]