CAJ | 학술논문

以偏铝酸钠和硝酸镍为原料，采用均匀沉淀法制备出Ni质量分数为40％的Ni‐Al2 O3催化剂，考察了不同焙烧温度（350，450，550，650，750℃）下制备的催化剂在C O甲烷化反应中的催化活性，使用T G‐D T G、N2吸附、XRD、H2‐T PR和 H2化学吸附分析了催化剂的织构、晶相和活性金属的化学形态。结果表明，随着焙烧温度的上升，Ni与Al2 O3载体之间的相互作用逐渐变强，形成大量的NiAl2O4，在450℃焙烧的催化剂活性最佳，在压力1.0 MPa、空速20000 mL／（g?h）和温度220℃的反应条件下，C O转化率达到99％以上；随着焙烧温度的增加，催化剂活性与镍的活性比表面积变化趋势一致，先增加、后降低，表明催化剂镍的活性比表面积影响其活性。
이편려산납화초산얼위원료，채용균균침정법제비출Ni질량분수위40％적Ni‐Al2 O3최화제，고찰료불동배소온도（350，450，550，650，750℃）하제비적최화제재C O갑완화반응중적최화활성，사용T G‐D T G、N2흡부、XRD、H2‐T PR화 H2화학흡부분석료최화제적직구、정상화활성금속적화학형태。결과표명，수착배소온도적상승，Ni여Al2 O3재체지간적상호작용축점변강，형성대량적NiAl2O4，재450℃배소적최화제활성최가，재압력1.0 MPa、공속20000 mL／（g?h）화온도220℃적반응조건하，C O전화솔체도99％이상；수착배소온도적증가，최화제활성여얼적활성비표면적변화추세일치，선증가、후강저，표명최화제얼적활성비표면적영향기활성。
A series of Ni‐Al2 O3 catalysts were prepared using sodium aluminate and nickel ni‐trate as raw materials through a homogeneous precipitation method .The effects of the calcination temperature (350 ,450 ,550 ,650 ,750 ℃) on the catalytic performance of CO methanation were investigated ,and the texture ,crystalline phase and chemical form of active metals were charac‐terized with the assistance of TG‐DTG ,BET ,XRD ,H2‐TPR and H2 chemical adsorption tech‐niques .The results show that with the increase of calcination temperature ,the interaction be‐tween Ni and Al2 O3 is enhanced gradually so that large amount of NiAl2 O4 is formed .By compar‐ison ,the 40NiAl‐450 catalyst shows the optimal catalytic activity of above 99% CO conversion in the following operating conditions :t=220 ℃ ,p=1.0 MPa ,and GHSV is 20 000 mL?g -1 ?h-1 . With the increase of calcination temperature ,the specific surface area decreases ,but the catalytic activity and nickel metal active specific surface area increase first and then decrease ,showing that the effect of nickel metal active specific surface area on the catalytic activity .