Acidity regulation of Fe-based catalysts and its effect on the selectivity of HDS reaction pathways

LI Guosheng; LI Kunhong; LI Xiaohan; YIN Xinrui; SHAO Jiaxin; GUO Rong; REN Shenyong; GUO Qiaoxia; SHEN Baojian

doi:10.1016/S1872-5813(23)60389-5

Volume 52 Issue 2

Feb. 2024

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Article Navigation > Journal of Fuel Chemistry and Technology > 2024 > 52(2): 234-248

LI Guosheng, LI Kunhong, LI Xiaohan, YIN Xinrui, SHAO Jiaxin, GUO Rong, REN Shenyong, GUO Qiaoxia, SHEN Baojian. Acidity regulation of Fe-based catalysts and its effect on the selectivity of HDS reaction pathways[J]. Journal of Fuel Chemistry and Technology, 2024, 52(2): 234-248. doi: 10.1016/S1872-5813(23)60389-5

Citation:

LI Guosheng, LI Kunhong, LI Xiaohan, YIN Xinrui, SHAO Jiaxin, GUO Rong, REN Shenyong, GUO Qiaoxia, SHEN Baojian. Acidity regulation of Fe-based catalysts and its effect on the selectivity of HDS reaction pathways[J]. Journal of Fuel Chemistry and Technology, 2024, 52(2): 234-248. doi: 10.1016/S1872-5813(23)60389-5

Citation:

LI Guosheng, LI Kunhong, LI Xiaohan, YIN Xinrui, SHAO Jiaxin, GUO Rong, REN Shenyong, GUO Qiaoxia, SHEN Baojian. Acidity regulation of Fe-based catalysts and its effect on the selectivity of HDS reaction pathways[J]. Journal of Fuel Chemistry and Technology, 2024, 52(2): 234-248. doi: 10.1016/S1872-5813(23)60389-5

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Acidity regulation of Fe-based catalysts and its effect on the selectivity of HDS reaction pathways

doi: 10.1016/S1872-5813(23)60389-5

LI Guosheng^1
,,
LI Kunhong^1
,,
LI Xiaohan^1
,,
YIN Xinrui^1
,,
SHAO Jiaxin^1
,,
GUO Rong^1
,,
REN Shenyong^1
,,
GUO Qiaoxia^2
,,
SHEN Baojian^{1
,
,}

1.
State Key Laboratory of Heavy Oil Processing, the Key Laboratory of Catalysis of CNPC, College of Chemical Engineering and Environment, China University of Petroleum, Beijing 102249, China
2.
College of Science, China University of Petroleum, Beijing 102249, China

Funds: The project was supported by the Foundation for Innovative Research Groups of the National Natural Science Foundation of China (22021004) and National Natural Science Foundation of China (21776304).

Received Date: 2023-09-05
Accepted Date: 2023-10-10
Rev Recd Date: 2023-10-09

Available Online: 2023-10-31

Publish Date: 2024-02-02

Abstract

Abstract

An Fe-based hydrodesulfurization (HDS) catalyst modified by Y zeolite was developed using Fe as the main active metal and Zn as a promoter. The change of morphology, pore structure, dispersity, reducibility, electronic defect structure and acidity of the Fe-based catalysts before and after modification were investigated using low-temperature nitrogen physical adsorption, X-ray diffraction (XRD), H₂-temperature programmed reduction (H₂-TPR), NH₃-temperature programmed desorption (NH₃-TPD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and pyridine infrared spectroscopy (Py-IR). Meanwhile, the HDS performance of the Fe-based catalyst was evaluated using a fixed-bed reactor. The results showed that the introduction of Y zeolite provided the Brønsted (B) acid sites, which increased the sulfur removal rates of Fe based catalysts by 10.7% −34.1%. Meanwhile, the B acid sites improved the selectivity of the direct desulfurization (DDS) reaction pathway. In addition, the B acid sites not only promoted the increase of DDS selectivity but also inhibited further deep hydrogenation of tetrahydrodibenzothiophene (THDBT) and hexahydrodibenzothiophene (HHDBT) in the hydrogenation (HYD) reaction pathway, thereby ensuring an increase in desulfurization efficiency while reducing hydrogen consumption. The fundamental reason was that the introduction of Y zeolite enhanced the acidity of the modified catalyst, especially the interaction between B acid sites and active metal promoted electron transfer, which adjusted the Fe species electronic defect structure, resulting in the improvement of HDS performance.
- Fe-based catalyst,
- Y zeolite,
- acidity,
- electronic defect structure,
- HDS,
- dibenzothiophene

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References(55)

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