CAJ | 학술논문

利用两种比表面积、孔容与平均孔径相近，孔径分布明显不同的γ-Al2O3载体浸渍得到了两种不同的Ni/Al2O3甲烷化催化剂，并进行XRD、SEM和H2-TPR表征。通过活性评价实验发现，孔径分布更分散的A载体制备得到的催化剂具有更好的活性。通过N2吸附发现，A载体中孔径为10nm以上的孔道较多。 XRD与SEM表征发现，这种结构更有利于活性组分进入到载体的孔道内，使活性组分更好地分散形成粒径较小的NiO晶粒，有效减少了活性组分在载体表面的团聚。 H2-TPR的实验结果表明，利用A载体制备得到的Ni/Al2O3催化剂中，固定态的γ-NiO要明显多于B催化剂，这种形态的NiO还原后形成的Ni0更难烧结与流失，能有效提高催化剂的高温活性与稳定性。
이용량충비표면적、공용여평균공경상근，공경분포명현불동적γ-Al2O3재체침지득도료량충불동적Ni/Al2O3갑완화최화제，병진행XRD、SEM화H2-TPR표정。통과활성평개실험발현，공경분포경분산적A재체제비득도적최화제구유경호적활성。통과N2흡부발현，A재체중공경위10nm이상적공도교다。 XRD여SEM표정발현，저충결구경유리우활성조분진입도재체적공도내，사활성조분경호지분산형성립경교소적NiO정립，유효감소료활성조분재재체표면적단취。 H2-TPR적실험결과표명，이용A재체제비득도적Ni/Al2O3최화제중，고정태적γ-NiO요명현다우B최화제，저충형태적NiO환원후형성적Ni0경난소결여류실，능유효제고최화제적고온활성여은정성。
Two different γ-Al2O3 supports with similar specific surface area, pore volume and pore diameter but different pore size distribution were used to prepare two Ni/Al2O3 methanation catalysts by impregnation method, and the catalysts were characterized by XRD, SEM and H2-TPR. The results of catalytic performance evaluation showed that catalyst Ni/Al2O3-A prepared by using the support with more dispersive distribution of pore size performed better activity. It was found by N2 adsorption characterization that there was a quantity of pore with diameter greater than 10nm in support A, and results of XRD and SEM indicated which made the active component more easy into the the pore channels of support, favoring the dispersion of active component to form finer NiO crystallines and inhibit the aggregation of NiO. Results of H2-TPR showed that there was more “fixed”γ-NiO in catalyst Ni/Al2O3-A, and the reduction product of the “fixed” γ-NiO was more difficult to sinter and detach from the support, which was beneficial for the activity and stability of catalyst.