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Enhanced olefin isomerization over CoMo/ZSM-23-γ-Al2O3 composite catalyst in hydrotreating of FCC naphtha
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DOI：10.1007/s10934-025-01877-9.png)
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Abstract
En 中文
ZSM-23 and gamma-Al2O3 were first synthesized individually and subsequently combined to prepare a composite support by physical mixing in a 10:90 weight% ratio. A CoMo/composite catalyst was then produced via incipient wetness impregnation. The catalytic performance was evaluated in the hydrotreating of a model FCC naphtha feed containing thiophene (1000 ppm S), 1-hexene (20 vol%), and n-heptane (80 vol%). Hydrotreating experiments were conducted at T = 220-280 degrees C, P = 2 MPa, H-2/feed ratio of 120 NL/L, and LHSV values of 5 and 10 h- 1. The supports and catalysts were characterized by X-ray diffraction, nitrogen adsorption-desorption, scanning electron microscopy, Fourier transform infrared spectroscopy, atomic absorption spectroscopy, NH3-temperature-programmed desorption, and thermal gravimetric analysis. The incorporation of unidirectional pore structure ZSM-23 zeolite into gamma-Al2O3 significantly modified the catalyst's acidity, resulting in enhanced olefin isomerization and improved octane number retention. Under optimal isomerization conditions (240 degrees C, LHSV of 10 h(-)(1)), the composite CoMo/AZ23 catalyst achieved an isomerization percentage of 66.8%, compared to 53.3% for the conventional CoMo/gamma-Al2O3. Consequently, under these conditions, the composite catalyst preserved fuel quality with a slight octane number increase (+ 0.1), effectively preventing the significant 2.5-unit loss associated with the conventional catalyst. This breakthrough directly enables the development of industrial hydrotreating catalysts capable of producing higher-value fuels.
Keywords:
ZSM-23
Gamma alumina
Co-Mo catalyst
Hydrotreating
FCC naphtha
Journal
IF:
3.2
Papers:
154
Citations:
5.0K
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