The tuning of pore structures and acidity for Zn/Al layered double hydroxides: The application on selective hydrodesulfurization for FCC gasoline

能源化学(英文) ›› 2015, Vol. 21 ›› Issue (4): 432-440.

The tuning of pore structures and acidity for Zn/Al layered double hydroxides: The application on selective hydrodesulfurization for FCC gasoline

Tinghai Wang^a,b,c, Jingfeng Li^c, Yi Su^c, Chenchen Wang^c, Yuan Gao^a,b,c, Lingjun Chou^a, Wenjun Yao^c

a State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, Gansu, China;
b University of Chinese Academy of Sciences, Beijing 100049, China;
c Lanzhou Petrochemical Research Center, Petrochina, Lanzhou 730000, Gansu, China

收稿日期:2015-03-13 修回日期:2015-06-30 发布日期:2015-08-21
通讯作者: Lingjun Chou
基金资助:
Financial supports from NSFC (21273105), MSTC (2013AA031703), NSFJC (BK20140596) and the fundamental research funds for central universities are acknowledged.

The tuning of pore structures and acidity for Zn/Al layered double hydroxides: The application on selective hydrodesulfurization for FCC gasoline

Tinghai Wang^a,b,c, Jingfeng Li^c, Yi Su^c, Chenchen Wang^c, Yuan Gao^a,b,c, Lingjun Chou^a, Wenjun Yao^c

a State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, Gansu, China;
b University of Chinese Academy of Sciences, Beijing 100049, China;
c Lanzhou Petrochemical Research Center, Petrochina, Lanzhou 730000, Gansu, China

Received:2015-03-13 Revised:2015-06-30 Published:2015-08-21
Contact: Lingjun Chou
Supported by:
Financial supports from NSFC (21273105), MSTC (2013AA031703), NSFJC (BK20140596) and the fundamental research funds for central universities are acknowledged.

摘要/Abstract

摘要： Co-Mo catalysts applied on the hydrodesulfurization (HDS) for FCC gasoline were prepared with Zn-Al layered double hydroxides (LDHs) to improve their performances, and the effects of pore structures and acidity on HDS performances were studied in detail. A series of Zn-Al/LDHs samples with different pore structures and acidities are synthesized on the bases of co-precipitation of OH^-, CO^2-, Al³⁺, and Zn²⁺. The neutralization pH is a main factor to affect the pore structures and acidity of Zn-Al/LDHs, and a series of Zn-Al/LDHs with different pore structures and acidities are obtained. Based on the representative samples with different specific surface areas (S_BET) and acidities, three CoMo/LDHs catalysts were prepared, and their HDS performances were compared with traditional CoMo/Al₂O₃ catalysts. The results indicated that catalysts prepared with high S_BET possessed high HDS activity, and Brönsted acid sites could reduce the thiol content in the product to some extent. All the three catalysts prepared with LDHs displayed little lower HDS activity but higher selectivity than CoMo/Al₂O₃, and could restrain the reactions of re-combination between olefin and H₂S which could be due to the existence of Brönsted acid sites.

关键词: Layered double hydroxides, Acidity, Pore structures, FCC gasoline, Hydrodesulfurization

Abstract: Co-Mo catalysts applied on the hydrodesulfurization (HDS) for FCC gasoline were prepared with Zn-Al layered double hydroxides (LDHs) to improve their performances, and the effects of pore structures and acidity on HDS performances were studied in detail. A series of Zn-Al/LDHs samples with different pore structures and acidities are synthesized on the bases of co-precipitation of OH^-, CO^2-, Al³⁺, and Zn²⁺. The neutralization pH is a main factor to affect the pore structures and acidity of Zn-Al/LDHs, and a series of Zn-Al/LDHs with different pore structures and acidities are obtained. Based on the representative samples with different specific surface areas (S_BET) and acidities, three CoMo/LDHs catalysts were prepared, and their HDS performances were compared with traditional CoMo/Al₂O₃ catalysts. The results indicated that catalysts prepared with high S_BET possessed high HDS activity, and Brönsted acid sites could reduce the thiol content in the product to some extent. All the three catalysts prepared with LDHs displayed little lower HDS activity but higher selectivity than CoMo/Al₂O₃, and could restrain the reactions of re-combination between olefin and H₂S which could be due to the existence of Brönsted acid sites.

Key words: Layered double hydroxides, Acidity, Pore structures, FCC gasoline, Hydrodesulfurization

Tinghai Wang, Jingfeng Li, Yi Su, Chenchen Wang, Yuan Gao, Lingjun Chou, Wenjun Yao. The tuning of pore structures and acidity for Zn/Al layered double hydroxides: The application on selective hydrodesulfurization for FCC gasoline[J]. 能源化学(英文), 2015, 21(4): 432-440.

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The tuning of pore structures and acidity for Zn/Al layered double hydroxides: The application on selective hydrodesulfurization for FCC gasoline

The tuning of pore structures and acidity for Zn/Al layered double hydroxides: The application on selective hydrodesulfurization for FCC gasoline

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