首页> 中文期刊> 《物理化学学报》 >Pd促进ZnO/Al2O3催化乙醇水蒸气重整制氢

Pd促进ZnO/Al2O3催化乙醇水蒸气重整制氢

         

摘要

Pd promoted ZnO/AI2O3 catalysts were prepared by impregnation method. The hydrogen production performance upon the steam reforming of ethanol (SRE) over the prepared catalysts was evaluated with n(H2O):n(C2H5OH) of 3:1 at 450 °C and atmospheric pressure. The results show that H2 and CH3CHO were the main products during the SRE reaction over the prepared catalysts. Different from the ZnO/AI2O3 catalysts, the Pd promoted ZnO/AI2O3 catalysts favored C - C scission during the SRE and thus a higher C2H5OH conversion of 65% and a H2 selectivity of 55% were obtained over the prepared Pd promoted catalysts. BET, transmission electron microscopy (TEM), and thermogravimetry-differential scanning calorimetry-mass spectrometry (TG-DSC-MS) coupling techniques were used to analyze the coking behavior on the catalyst surface. We found that Pd promotion does not prevent the formation of coke on the ZnO/AI2O3 catalysts.%采用浸渍法制备了Pd促进ZnO/Al2O3催化剂,考察了该催化剂作用时,在水醇摩尔比为3,常压和450℃工作条件下乙醇水蒸气重整(SRE)制氢反应性能.研究结果表明,在该催化剂体系作用下的SRE反应过程中,H2、CH3CHO为主要产物,与ZnO/Al2O3催化剂不同,Pd能促使CH3CHO发生C-C键断裂反应,显著提高C2H5OH转化率及H2选择性,分别达65%、55%.还利用BET比表面积、透射电子显微镜(TEM)、热重-差示扫描量热-质谱(TG-DSC-MS)等表征手段考察了催化剂失活以及表面积炭情况,发现Pd的加入对催化剂总积炭量并无明显影响.

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