甲醇水蒸汽转化制氢Cu_1Zn_1Al_(3.2)催化剂研究

Cu_1Zn_1Al_(3.2) Catalyst for Hydrogen Production by Steam Reforming of Methanol

采用浸渍法制备了一系列CuxZnyAlz催化剂,考察了催化剂焙烧温度和组成对甲醇水蒸汽转化制氢反应性能的影响,用TG-DTA、XRD和SEM等方法对催化剂性能进行了表征。结果表明:400℃焙烧、Cu/Zn/Al配比(摩尔)为1:1:3.2时,制备的Cu1Zn1Al3.2催化剂具有良好催化性能;Cu1Zn1Al3.2催化剂较为适宜的反应工艺条件为:反应温度240～250℃,水/醇比1.1～1.3,液体质量空速1～2h-1;甲醇转化率达到100%,二氧化碳选择性大于97%。本研究制备的Cu1Zn1Al3.2催化剂中CuO含量仅为24.53%(质量),约为通常共沉淀法制备的Cu/Zn/Al催化剂的CuO含量的50%,但Cu1Zn1Al3.2催化剂对甲醇水蒸汽转化制氢反应性能与共沉淀法相当。为甲醇水蒸汽转化制氢技术用于燃料电池用氢和中小规模制氢过程提供依据。

A series of CuxZnyAlz, catalysts were prepared by impregnation method for hydrogen production by steam reforming of methanol. TG-DTA, XRD and SEM techniques were used to characterize the prepared catalysts. The effects of calcination temperature and catalysts compositions on the performance of catalysts were studied. Experimental results show that, when the calcination temperature is 400℃ and the molar ratio of Cu/Zn/Al is 1：1：3.2, the prepared catalysts possess good catalytic performance. The suitable reaction conditions for the Cu1Zn1Al2.3 catalyst prepared were found as follows： reaction temperature of 240-250℃, molar ratio of water/methanol of 1.1-1.3 and the methanol-water space velocity of 1-2 h^-1, and under these suitable conditions, the methanol conversion can achieve to 100% ,the CO2 selectivity is above 97%. While the hydrogen production performances of the catalysts are comparable, the CuO content in the Cu1Zn1Al2.3 catalyst prepared is only 24.53%（mass）, which is about half of that in the catalyst prepared by co-precipitation method. The experimental results of the technology for hydrogen production by steam reforming of methanol are helpful for using the technology in mobile fuel cell and other medium or small hydrogen needed enterprises.