EXAFS Study of Ni/W/Zeolite/Al2O3 Hydrocracking Catalyst Sulfurized with Different Modified Zeolites

Chem. J. Chinese Universities ›› 2000, Vol. 21 ›› Issue (10): 1459.

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EXAFS Study of Ni/W/Zeolite/Al₂O3 Hydrocracking Catalyst Sulfurized with Different Modified Zeolites

ZHANG Jian¹, LU Hai-Long¹, SUN Jian-Wei¹, YAO Jian-Dong¹, LI Quan-Zhi¹, GUAN Ming-Hua², WANG Ji-Feng², DING Lian-Hui², YIN Ze-Qu², HU Tian-Dou³, XIE Ya-Ning³

1. Fudan University, Departmentof Chemistry, Shanghai 200437, China;
2. Fushun Petroleum Research Institute, Fushun 113001, China;
3. Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100039, China

Received:1999-08-02 Online:2000-10-24 Published:2000-10-24

Abstract

Abstract: Four hydrocracking catalysts supported on different kinds of modified Y zeolites were studied by utilizing EXAFS(Extend X-ray Absorption Fine Structure).The results show that the Ni and W in the catalysts have not been thoroughly sulfided. Apart from the sulfided state，the tungsten in the sulfided catalysts exists in a state of oxosulfided tungsten while some nickels exist in their oxide state. In addition，it also shows that there are NiWS species in the sulfided catalysts and the amount of which shows a good cor-relation with the Bronsted acid sites of the mixture supports of zeolites and γ-Al₂O₃.It means that the Ni-WS species maybe exist mainly in the cavities of the zeolites and the tungsten in micropore zeolites is more difficult to be sulfided than that on the surface of amorphous Al₂O₃.

Key words: Hydrocracking catalyst, Zeolites, EXAFS, NiWS phase

CLC Number:

O614.3

TrendMD:

ZHANG Jian, LU Hai-Long, SUN Jian-Wei, YAO Jian-Dong, LI Quan-Zhi, GUAN Ming-Hua, WANG Ji-Feng, DING Lian-Hui, YIN Ze-Qu, HU Tian-Dou, XIE Ya-Ning. EXAFS Study of Ni/W/Zeolite/Al₂O3 Hydrocracking Catalyst Sulfurized with Different Modified Zeolites[J]. Chem. J. Chinese Universities, 2000, 21(10): 1459.

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EXAFS Study of Ni/W/Zeolite/Al₂O3 Hydrocracking Catalyst Sulfurized with Different Modified Zeolites

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