Pt/MoC_(x)的制备及其低温催化甲醇水蒸气重整制氢反应研究  

Preparation of Pt/MoC_(x) and its low-temperature catalytic steam reforming of methanol to hydrogen production

作　　者：张振峰 田心瑶 孙海[1] ZHANG Zhen-feng;TIAN Xin-yao;SUN Hai(Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院大连化学物理研究所,辽宁大连116023 [2]中国科学院大学,北京100049

出　　处：《应用化工》2023年第9期2556-2560,2565,共6页Applied Chemical Industry

基　　金：中国科学院战略性先导科技专项(A类)(XDA21090300)。

摘　　要：甲醇水蒸气重整反应(MSR)是一种颇具应用前景的移动制氢技术,降低其反应温度可以节约大量能量。采用固定床催化反应实验,结合XRD、TPR、BET、SEM、TEM、XPS等表征,考察了Pt载量对MoC_(x)相态变化及其催化低温MSR性能的影响。结果表明,Pt的引入降低了渗碳过程中三氧化钼的起始还原温度,促进了α-MoC_(1-x)的形成,且负载Pt后的MoC_(x)比表面积更大。随着Pt/MoC_(x)中Pt载量的增加,甲醇的转化率逐渐提高,当催化剂组成为1.6Pt/MoC_(x)时,反应性能最佳:反应温度为160℃、n(水)∶n(甲醇)=3、气体空速为4 000 mL/(g·h)时,甲醇的转化率为92.1%,H2选择性为96.8%,尾气中湿基CO含量为0.28%,优于相同测试条件下使用商品CuZnAlO_(x)催化剂时甲醇的转化率(25.6%)。Steam reforming of methanol(MSR)is a mobile hydrogen production technology with great application prospect.Reducing the reaction temperature can save a lot of energy.The effects of Pt loading on the phase change of MoC_(x) and its catalytic performance for low-temperature MSR were investigated by fixed-bed catalytic reaction experiment,XRD,TPR,BET,SEM,TEM and XPS.The results show that the introduction of Pt reduces the initial reduction temperature of molybdenum trioxide during carburzing,promotes the formation ofα-MoC 1-x,and the specific surface area of the sample loaded with Pt is larger.With the increase of Pt loading in Pt/MoC_(x),the conversion rate of methanol gradually increased.When the catalyst composition was 1.6Pt/MoC_(x),the reaction performance was the best:when the reaction temperature was 160℃,n(water)∶n(methanol)=3,and the gas space velocity is 4000 mL/(g·h),the conversion rate of methanol was 92.1%,the CO_(2) selectivity is 96.8%,and the CO content in the tail gas is 0.28%,which is superior to the methanol conversion(25.6%)of the commercial CuZnAlO_(x) catalyst under the same test conditions.

关 键 词：碳化钼 低温甲醇水蒸气重整 制氢催化剂 燃料电池 

分 类 号：TQ426[化学工程] O643[理学—物理化学]