PtCoK/Al2O3催化剂涂层选择性氧化脱除富氢气氛中的CO

Catalytic performance of PtCoK/Al2O3 catalyst coatings for preferential CO oxidation

摘要:

富氢气体中选择性氧化脱除CO是去除重整气中少量CO的有效方法。对K/Pt摩尔配比对PtCoK/Al2O3催化剂涂层的影响进行了研究。发现，适量K的添加能够显著提高催化剂涂层的CO去除能力，最优K/Pt摩尔比是1～1.5，超过这个配比，CO脱除能力降低。将进口气氛中O2的浓度从1%提高到1.5%，可提高CO转化率，但是对应的CO2选择性有所下降。富氢气中同时含有H2O和CO2对催化剂涂层活性影响微弱。连续反应100小时后，PtCoK/Al2O3催化剂涂层上CO转化率几乎没有下降，催化剂涂层非常稳定，表明该催化剂涂层具有较强的工业化应用前景。

Abstract:

Preferential oxidation of CO is an efficient method to remove the small amount of CO from reformed gas. The catalytic performances of different K/Pt molar ratio catalyst coatings in the preferential oxidation of CO in hydrogen rich stream were studied. The results showed that the optimal K/Pt molar ratio is about 1~1.5. When the K amount exceeded this value, the CO conversion decreased significantly. The increase in inlet O2 concentration from 1% to 1.5% can increase the CO conversion and decrease the CO2 selectivity. In addition, the effects of H2O and CO2 were also investigated. The best catalyst coating exhibited a good H2O and CO2 resistance under the best catalytic reaction temperature. The good stability during a continuous test of 100 h indicates high potential of this catalyst coating in commercial preferential oxidation of CO.