Citation: LI Tao, CHE Xiao-li, YUN Yi-feng, TAO Zhi-chao, ZHAO Chun-li, YANG Yong, LI Yong-wang. Study of the relationship between the acidity of amorphous silica-alumina supports and diesel selectivity in Fischer-Tropsch wax hydrocracking[J]. Journal of Fuel Chemistry and Technology, ;2017, 45(5): 589-595. shu

Study of the relationship between the acidity of amorphous silica-alumina supports and diesel selectivity in Fischer-Tropsch wax hydrocracking

LI Tao ^1,2,3 ,
CHE Xiao-li ⁴ ,
YUN Yi-feng ^3,5 ,
TAO Zhi-chao ^3,5 ,
ZHAO Chun-li ^1,2,3 ,
YANG Yong ^1,3,5,*,, ,
LI Yong-wang ^1,3,5

1.
State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China
3.
National Engineering Laboratory for Indirect Coal Liquefaction, Beijing 101407, China
4.
Shangdong Gongquan Chemical CO. LTD., Zibo 255400, China
5.
Synfuels China Technology CO. LTD., Beijing 101407, China

Corresponding author: YANG Yong, yyong@sxicc.ac.cn
Received Date: 13 February 2017
Revised Date: 25 March 2017

Fund Project: the Strategic Priority Research Program of the Chinese Academy of Sciences XDA07060200

Figures(7)

Three amorphous silica-alumina supports with similar textural properties and different amounts of acidity were successfully synthesized through ammonium exchange processing and their structures, acidity properties and the coordination of Si and Al in the as-synthesized supports were characterized using XRD, N₂ adsorption-desorption, NH₃-TPD, Py-FTIR and NMR. Amorphous silica-alumina was impregnated into a solution of H₁₂N₄PtCl₂·XH₂O to obtain hydrocracking catalysts. The relationship between acidic properties of supports and catalytic performance was studied by hydrocracking of Fischer-Tropsch (F-T) wax to diesel in a continuous-flow type fixed-bed reactor as a model reaction. The results illustrated that the diesel selectivity was mainly related to Brønsted acid properties of the supports while Lewis acid showed little correlation. The amount of strong Brønsted acid was reversely related to the selectivity of diesel:the smaller the amount, the higher the selectivity. The as-synthesized Pt/B-1 catalyst showed high selectivity of 87.12% to diesel at the conversion of F-T wax of about 62.52%, under the reaction conditions of 370℃, 7.0 MPa, LHSV of 1.0 h^-1 and a hydrogen-to-wax ratio of 1 000:1. Pt/B-1 had better catalytic performance than Pt/ASA prepared by commercial amorphous silica-alumina (ASA).
- hydrocracking,
- amorphous silica-alumina,
- Fischer-Tropsch wax,
- diesel,
- selectivity
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