Catalytic performance of NiMo/Al2O3-USY in the hydrocracking of low-temperature coal tar

被引：0
作者：
Yang J.-K. [1 ]
Zuo T.-J. [1 ]
Lu Y.-Y. [1 ]
Zeng W.-S. [1 ]
Lu J.-Y. [1 ]
机构：
[1] Key Laboratory of Oil & Gas Fine Chemicals, Ministry of Education, Xinjiang University, Urumqi
来源：
Ranliao Huaxue Xuebao/Journal of Fuel Chemistry and Technology | 2019年 / 47卷 / 09期
基金：
中国国家自然科学基金;
关键词：
Hydrocracking; Low-temperature coal tar; Modified USY; NiMo/Al[!sub]2[!/sub]O[!sub]3[!/sub]-USY; Sulfur content;
D O I：
10.1016/s1872-5813(19)30043-x
中图分类号：
学科分类号：
摘要：
A series of NiMo/Al2O3-USY catalysts with different MoO3 contents were prepared through incipient wetness method and further modified with NH4F. The NiMo/Al2O3-USY catalysts were characterized by XRD, XPS, HR-TEM, NH3-TPD, H2-TPR and N2 adsorption and their catalytic performance in the hydrocracking of low-temperature coal tar (LTCT) was investigated in a 200 mL fixed-bed reactor. The results indicate that the appropriate MoO3 content is 15% (mass ratio); higher MoO3 content may lead to the agglomeration of active metals on the support, although it has little influence on the sulfidation degree of Mo species and the conversion of coal tar upon hydrocracking. In addition, the amount of strong acid sites and pore diameter decrease gradually with a further increase in the MoO3 content, which is disadvantageous for deep hydrocracking. The modification of USY zeolite with NH4F solution can enlarge the average pore diameter of resultant NiMo/Al2O3-USY catalysts and then improve the residue conversion of coal tar. However, the amount of strong acid sites decreases obviously when the concentration of NH4F solution exceeds 0.6 mol/L, which may lead to an increase of the sulfur content in the hydrocracking product. Over the NiMo/Al2O3-USY catalyst modified with 0.6 mol/L NH4F solution, the residue conversion of coal tar reaches 87.65%; the sulfur contents in the gasoline fraction (<180℃) and diesel fraction (180-320℃) are 5.96 and 34.98 mg/kg, respectively. © 2019, Science Press. All right reserved.
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页码：1053 / 1066
页数：13
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