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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。该文考察了K/Pt摩尔比对PtCoK/Al2O3催化剂涂层的影响。研究发现,适量K的添加能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的体积分数从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 h后,PtCoK/Al2O3催化剂涂层上CO转化率几乎未降低,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。
The selective oxidation of CO in hydrogen-rich gas is an effective way to remove a small amount of CO in the reformed gas. The effect of K / Pt molar ratio on the PtCoK / Al2O3 catalyst coating was investigated. It was found that the addition of appropriate amount of K can significantly improve the CO removal ability of the catalyst coating. The optimal K / Pt molar ratio is 1 ~ 1.5, beyond which the CO removal capacity is reduced. Increasing the volume fraction of O2 in the inlet atmosphere from 1% to 1.5% increases the CO conversion, but the corresponding CO2 selectivity decreases. Hydrogen-rich gas containing both H2O and CO2 has little effect on the activity of the catalyst coating. After continuous reaction for 100 h, the CO conversion on the PtCoK / Al2O3 catalyst coating was almost unchanged, and the catalyst coating was very stable, indicating that the catalyst coating has a strong industrial application prospect.