【摘要】 采用浸渍-共沉淀法制备了Ni/CuO-ZrO2-CeO2-Al2O3催化剂,其中Ni负载量为10%(质量分数)。采用XRD、H2-TPR等方法表征了催化剂的结构及还原性能,并在固定床微反装置中考察了载体制备的沉淀过程中pH值的改变对Ni/CuO-ZrO2-CeO2-Al2O3催化剂在甲烷自热重整制氢反应中催化性能的影响。研究发现,在反应温度为650℃～850℃范围内,pH值为9制备的Ni/CuO-ZrO2-CeO2-Al2O3催化剂的甲烷转化率最高。由TPR与XRD结果可知,在制备条件中pH值为9的催化剂载体中ZrO2进入CeO2的晶格中,形成更多的CeO2-ZrO2固溶体,使得NiO与载体之间的相互作用增强,从而提高了甲烷的转化率。更多还原

【Abstract】 Ni-Cu/ZrO2-CeO2-Al2O3 catalysts were prepared by co-precipitation method using Na2CO3 as the precipitant(pH value=7,9,11 or 13).Ni loading(mass fraction) of the catalysts was 10%.The structure and reduction performance of the catalysts were characterized by XRD and H2-TPR,and the effect of pH value on the catalytic performance of Ni catalysts for the autothermal reforming of methane to hydrogen was investigated.The results showed Ni/CuO-ZrO2-CeO2-Al2O3 catalyst prepared with pH value=9 had the highest activity in reaction temperature 650 ℃~ 850 ℃.The results of TPR and XRD indicated that when the pH values was 9,the formation of ZrO2-CeO2 solid solution was improved,which could improved the interaction of NiO and supports.更多还原