载体水热处理时间对催化剂性质及加氢降残炭活性的影响

EFFECT OF HYDROTHERMAL TREATMENT TIME OF SUPPORT ON HDCCR PERFORMANCE OF CATALYST

考察了载体水热处理时间对催化剂物性结构及加氢降残炭活性的影响。采用低温N2吸附-脱附、H2-程序升温还原、拉曼光谱、热重、高分辨透射电子显微镜等手段对载体和催化剂进行了表征。结果表明,不同时间水热处理得到的载体制成催化剂后,随着载体水热处理时间的延长,由于载体表面—OH数量增加,金属与载体间的相互作用逐渐增强,从而使硫化后的催化剂活性相结构发生变化,活性相逐渐变"小"。在高压釜中进行了催化剂的实际油品降残炭与脱硫性能评价,发现随着载体水热处理时间的延长,催化剂的降残炭和脱硫活性逐渐降低。

The effect of hydrothermal treatment time of support on physical structure and HDCCR activity of catalysts was studied. The catalysts were characterized by BET, TPR, Raman spectrum, TG, HRTEM. It is shown that with the increasing of hydrothermal treatment time of the support, the number of --OH groups on the support surface increases. The catalysts made from hydrothermal trea ted supports have higher specific surface area and lower mean pore size. Those changes indicate that the interaction between metal and support increases with increasing of hydrothermal treatment time, resulting in changes in the structure of active phase of catalysts. The active phase size becomes smaller and the degree of aggregation decreases. The performances of catalysts were evaluated in an autoclave and the results show that the HDCCR and HDS activity of the catalyst are both decreased as the hydro- thermal treatment time is prolonged.