CAJ | 학술논문

采用分步浸渍法制备了不同ZrO2载量的Ni/ZrO2-Al2O3催化剂，利用N2物理吸附、X射线衍射（XRD）、H2程序升温还原（H2-TPR）、H2程序升温脱附（H2-TPD）、程序升温氧化（TPO）等手段对催化剂的结构进行表征，并考察了其在低H2/CO比（H2/CO约为1）下CO甲烷化的催化性能。结果表明，ZrO2助剂可削弱NiO与载体Al2O3间的相互作用，抑制镍铝尖晶石的生成。适量ZrO2的引入有助于提高活性组分Ni的还原度和分散度，对催化剂的甲烷化性能有促进作用。通过分析反应后催化剂上的积炭性质，发现ZrO2的加入能有效地抑制低活性碳物种的生成，提高催化剂的抗积炭能力，从而改善催化剂的稳定性。
채용분보침지법제비료불동ZrO2재량적Ni/ZrO2-Al2O3최화제，이용N2물리흡부、X사선연사（XRD）、H2정서승온환원（H2-TPR）、H2정서승온탈부（H2-TPD）、정서승온양화（TPO）등수단대최화제적결구진행표정，병고찰료기재저H2/CO비（H2/CO약위1）하CO갑완화적최화성능。결과표명，ZrO2조제가삭약NiO여재체Al2O3간적상호작용，억제얼려첨정석적생성。괄량ZrO2적인입유조우제고활성조분Ni적환원도화분산도，대최화제적갑완화성능유촉진작용。통과분석반응후최화제상적적탄성질，발현ZrO2적가입능유효지억제저활성탄물충적생성，제고최화제적항적탄능력，종이개선최화제적은정성。
Ni/ZrO2-Al2O3 catalysts were prepared by multi-step wet impregnation method and characterized by N2 physisorption,X-ray diffraction (XRD),temperature-programmed reduction (TPR),temperature-programmed desorption (TPD) and temperature-programmed oxidation (TPO) techniques. The influence of zirconia loading on the reactivity of alumina supported nickel catalysts for CO methanation with low H2/CO ratio has been investigated. The results revealed that the addition of an intermediate content of ZrO2 improved the reducibility and dispersion of Ni species by weakening the interaction between nickel and support , which is responsible for the enhanced catalytic performances. Furthermore,it was shown that the addition of ZrO2 in Ni/Al2O3 catalysts effectively inhibited the formation of low active C species,resulting in a better coking resistance and higher catalytic stability.