摘要
采用共沉淀耦合机械混合法制备了CuO-ZnO-Al2O3/HZSM-5双功能催化剂用于二甲醚水蒸气重整制氢的研究,结合BET、H2-TPR、XRD、SEM等表征手段,在泡沫金属微反应器内考察助剂Cr、Zr、Ce、Co对双功能催化剂催化性能的影响。研究结果表明,加入Cr助剂后,可以有效降低催化剂的平均孔径和还原温度,并抑制催化剂制备过程中氢氧化锌晶相的形成,催化剂的低温催化性能明显提高,二甲醚的转化率和氢收率在较低温度下即可分别达到99%和95%,表现出了良好的低温反应活性。考察了反应温度、空速和水醚比等条件对二甲醚水蒸气重整催化剂催化活性的影响,在250℃、空速3 884 mL/(g·h)、水醚比为5的条件下,CuO-ZnO-Al2O3-Cr2O3/HZSM-5催化二甲醚水蒸气重整反应进行50 h,二甲醚的转化率维持在97%以上,催化剂的活性没有明显下降。
The CuO-ZnO-A1203/HZSM-5 catalyst prepared by co-precipitation and mechanical mixing with HZSM-5 was used for hydrogen production from steam reforming of dimethyl ether. The effects of Cr, Zr, Co and Ce promoters on catalyst performance were investigated by means of X-ray diffraction （XRD）, temperature programmed reduction （H2-TPR）, SEM and BET. The results showed that addition of promoter Cr can reduce the average pore diameter and reduction temperature of catalyst effectively, and inhibited the form of Zn （OH） 2 in the catalyst preparation process. The conversion of dimethyl ether and hydrogen yield reaches 99% and 95% respectively at low reaction temperature. The effects of reaction termperature, space velocity and steam-to-DME ratio were investigated. At the conditions of 250℃, the space velocity of 3 884 mL/（ g. h）, H2O/DME = 5, over 97% of DME conversion was obtained over the CuO-ZnO-A12O3-CrzO3/HZSM-5 catalyst and the catalytic activity has no obvious deactivation during 50 h durability test.
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
2013年第10期1210-1216,共7页
Journal of Fuel Chemistry and Technology
基金
国家自然科学基金(21276254)
