载体焙烧温度对催化剂加氢脱残炭活性的影响

考察了载体焙烧温度对催化剂物性结构及加氢降残炭活性的影响。采用BET，H2-TPR，HRTEM等手段对载体和催化剂进行了表征。结果表明，随着载体焙烧温度的增加，载体的比表面积逐渐减小，平均孔径增大，表面羟基数量减少。将通过不同焙烧温度得到的氧化铝载体制成催化剂后，发现随着载体焙烧温度的增加，载体表面羟基数量减少，金属与载体间的相互作用逐渐减弱，从而使硫化后的催化剂活性相结构发生改变，即随着焙烧温度的升高，活性相逐渐变“大”，积聚程度逐渐增加。使用高压釜进行催化剂的实际油品降残炭与脱硫性能评价，发现600 ℃焙烧的载体所制成的催化剂降残炭活性最高。

EFFECT OF CALCINATION TEMPERATURE OF SUPPORT ON PERFORMANCE OF CARBON RESIDUE REDUCTION OF HYDROGENATION CATALYST

The effect of calcination temperature of support on physical structure and the performance of catalysts was studied. The support and catalysts were characterized by BET, TPR and TEM techniques. The carbon residue reduction (HDCCR) activity of hydrogenation catalyst was conducted using an autoclave. It is shown that with increasing calcination temperature, specific surface area of the support decreases, mean pore size enlarges, the number of –OH group on the support surface decreases，which weakens the interaction between metal and support. It is found that the calcination makes the structure of MoS2 slab change. With increasing calcination temperature, the slab size becomes larger, leading to a lower dispersion. The HDCCR activity of the catalyst reaches the best when the support is calcined at 600℃.