泡沫金属微反应器内二甲醚水蒸汽重整制氢的研究

HYDROGEN PRODUCTION FROM STEAM REFORMING OF DIMETHYL ETHER IN METAL FOAM MICROREACTOR

在自制的泡沫金属微结构反应器中,以多孔泡沫镍为载体,负载Cu6Zn3Al0.5Ce0.5/HZSM-5双功能催化剂,用于二甲醚水蒸汽重整制氢的研究。考察负载方法、水醚比、空速、反应温度以及催化剂焙烧温度等条件对二甲醚水蒸汽重整反应的影响。通过X射线衍射(XRD)、程序升温还原(H2-TPR)等手段对催化剂负载方法与催化性能的关系进行探索。结果表明:直接将催化剂Cu6Zn3Al0.5Ce0.5/HZSM-5涂覆在泡沫镍上的催化效果最好,催化剂的最适宜煅烧温度为450℃。在275℃,空速5180 m L/(g·h),水醚比为5的反应条件下,二甲醚转化率和氢收率分别可达99%和95%,反应进行40 h催化剂活性没有明显降低,二甲醚的转化率保持在97%以上。

Cu6Zn3Al0.5Ce0.5/HZSM-5 dual-function catalyst was coated on nickel metal foam. The effect of coating method, velocity of feedstock and calcination temperature on steam reforming of dimethyl ether （DME SR） was investigated in the micro structure metal foam reactor. The preparation method and catalytic activity of the Cu6Zn3Al0.5Ce0.5/HZSM-5 catalyst were explored by means of Xray diffraction （XRD） and temperature-programmed reduction （TPR）. The results indicate that conversion of dimethyl ether and hydrogen yield reach 99% and 95% under the conditions of reaction temperature of 275℃, the space velocity of 5180 mL/（g, h） , H20/DME=5 and the calcination temperature of 450℃, respectively. During 40 h durability testing, DME conversion maintained 〉97% over the Cu6Zn3Al0.5Ce0.5/HZSM-5 catalyst, which has no obvious deactivation.