原位溶胶-凝胶法制备深度加氢脱芳催化剂NiO-MoO3/SiO2-Al2O3-TiO2

 利用原位溶胶-凝胶技术制备不同SiO₂含量及Ni/Mo摩尔比的负载型NiO-MoO₃/SiO₂-Al₂O₃-TiO₂深度加氢脱芳烃催化剂。采用ICP、N₂吸附-脱附等温线及XRD方法，表征催化剂的物化性质、结构特征；采用TPD、TPR手段，考察催化剂的酸强度以及活性组分Ni与载体的相互作用；在固定床加压连续微反装置上，以航空煤油为原料，进行深度加氢脱芳催化反应，考察催化剂的活性和稳定性。结果表明，原位溶胶-凝胶法制备的Ni基负载型催化剂的操作工艺简单，且不改变原载体的表面结构特征，通过表面涂硅处理及改变SiO₂含量，达到调节催化剂酸强度的目的；MoO₃的加入能够增加Ni原子的活性位，减弱其与载体的相互作用。催化剂的总金属含量较高(30%)时，显示出良好的加氢脱芳烃性能及稳定性。航空煤油深度加氢脱芳烃产品油中总芳烃的质量分数小于0.002%。

PREPARATION OF DEEP HYDRODEAROMATICS CATALYST NiO-MoO3/SiO2-Al2O3-TiO2 BY IN-SITU SOL-GEL METHOD

The NiO-MoO3/SiO2-Al2O3-TiO2 catalysts with different SiO2 contents and molar ratios of Ni/Mo were prepared by in-situ sol-gel method. The physi-chemical and textural properties of the catalysts were characterized by ICP, N2 adsorption and XRD. Measurements of butyamine-temperature-programmed desorption (C4H9NH2-TPD) and temperature-programmed reduction (TPR) were performed to monitor acid strength on the catalysts and the interaction of Ni species with supports, respectively. In the continuous fixed bed reactor, the deep hydrodearomatics of jet fuel over above-mentioned catalysts were carried out to evaluate the activity and stability of the catalysts. The results showed that the manufacture procedure of catalyst with in-situ sol-gel method was simple and convenient. In this way, the inherent characteristics of support was unchanged, and with varying the amount of SiO2 to treat the support surface, the acid strength of catalyst was adjusted. MoO3 was introduced into the catalyst to increase activity sites of Ni species and to weaken the interaction between Ni and support. The activity and stability of catalysts were favorable, when total metal content was as many as 30%. The total mass fraction of aromatics in oil product obtained from deep hydrodearomatics of jet fuel over NiO-MoO3/SiO2-Al2O3-TiO2 catalyst was less than 0.002%.