CeO_2改性Cu/Zn-Al水滑石衍生催化剂对甲醇水蒸气重整制氢性能的影响

采用原位合成法在γ-Al2O3表面合成了锌铝水滑石,再采用顺次浸渍法制备了Ce/Cu/Zn-Al催化材料;将其应用于甲醇水蒸气重整制氢,探讨了Ce含量对Cu/Zn-Al催化剂催化性能的影响.催化剂表征结果表明,CeO_2的引入改善了活性组分铜的分散度、铜的比表面积以及催化剂的氧化还原性质,进而提高了催化剂的催化活性和产氢率.当Ce含量为4%时,催化剂活性最佳,在250℃时,甲醇转化率达到100%,CO摩尔分数为0.39%,与Cu/Zn-Al催化剂相比,甲醇转化率提高了近40%.

Effect of CeO2 on Cu/Zn-Al Catalysts Derived from Hydrotalcite Precursor for Methanol Steam Reforming

ZnAl-LDHs was synthesized onγ-Al2 O3 by in situ synthesis method. Moreover, the Ce/Cu/Zn-Al catalysts were prepared by ordinal wet impregnation method and applied to methanol steam reforming. The effect of cerium content on Cu/Zn-Al catalysts was discussed for methanol steam reforming. The catalysts were studied by XRD, SEM, H2-TPR, N2 adsorption techniques and chemisorption N2O. The results showed that the addition of CeO2 improved the copper dispersion, copper surface area and catalyst reducibility. The catalytic activity and hydrogen production rate was also promoted thereby. When the Ce content was 4％, the catalyst exhibited the best catalytic activity, that was, the methanol conversion was 100％ and the molar fraction of CO was 039％ at 250 ℃ in hydrogen production by methanol steam reforming. Compared to the Cu/ZnAl catalyst, the methanol conversion increased by almost 40％.