期刊
CHEMICAL ENGINEERING JOURNAL
卷 389, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.123461
关键词
Deactivation; Dual bed catalyst; Hydrocracking; Light cycle oil; High-octane gasoline
资金
- Natural Science Foundation of China [21978325, 21606254]
- National Key Technologies Research and Development Program of China [2017YFB0306503]
- Fundamental Research Funds for the Central Universities [18CX02130A, 18CX02014A]
- Open Project of State Key Laboratory of Chemical Engineering [SKL-ChE-18C04]
- Liaoning Revitalization Talents Program [XLYC1807245]
- Doctoral Initiation Fund for Liaoning [2019-BS054]
Processing of light cycle oil (LCO) by hydrotreating and subsequent hydrocracking process harbors tremendous significance due to more stringent environmental regulations and growing demand for high-octane gasoline. However, the commercial single bed hydrocracking catalysts normally over-saturate multi-ring aromatics in LCO, leading to increased H-2/energy consumption and reduced octane number. Herein, novel dual bed catalyst strategy is first proposed to enhance the hydrocracking performance, which contains fresh and used Ni-Mo/HY-Al2O3 catalysts as upstream and downstream bed catalyst, respectively. In order to select suitable downstream catalyst, the used industrial Ni-Mo/HY-Al2O3 catalysts in reactor after running for almost 1 year were divided into almost 20 layers through sampling along the axial positions, and then systematically analyzed by multi-techniques, including XPS, HRTEM, Py-IR, TPD, TGA and XRD. It is found that the first 20% of all catalyst layers suffer from serious deactivation due to coke formation, leading to the loss of Ni-Mo-S phase and acidic sites. Employing this first 20% of used catalysts as downstream catalyst, the weaker hydrogenation performance could avoid excessive hydrogenation and maintain mono-aromatics content. As expected, the designed dual bed catalyst leads to superior octane number, higher liquid yield of C-5(+) and lower H-2 consumption than the commercial single bed catalyst. This strategy not only offers a scenario to boost the hydrocracking performance, but also sheds new light on the efficient utilization of used catalyst.
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