EXAFS Characterization of Sulfur-tolerant Pd-Pt/USY Catalystfor Deep Hydrodearomatization of Diesel

Chem. J. Chinese Universities ›› 2002, Vol. 23 ›› Issue (4): 712.

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EXAFS Characterization of Sulfur-tolerant Pd-Pt/USY Catalystfor Deep Hydrodearomatization of Diesel

YANG Jun^1,2, ZHANG Xi-Wen², HAN Chong-Ren², LU Guan-Zhong¹

1. Research Institute of Industrial Catalysis, East China university of Science and Technology, Shanghai 200237, China;
2. Fushun Research Institute of Petroleum and Petrochemicals Engineering, Petroleum and Petrochemical Engineering Croup, Fushun 113001, China

Received:2001-03-21 Online:2002-04-24 Published:2002-04-24

Abstract

Abstract: The metal dispersion and sulfur tolerancc of Pd-Pt/USYcatalysts with different n(Pd)/n(Pt) ratios was investigated by using an extended X-ray absorption fine structure(EXAFS) method.The resultsindicate that the presence of Pd in Pd-Pt/USY catalyst can restrain Pt particles from agglomerating, so thePt dispersion of catalyst calcined in air increases as the increasing of n(Pd)/n(Pt) ratio.There are morePd/Pt alloy metal particles in sulfided Pd-Pt/USY catalyst with n(Pd)/n(Pt) = 4/1, which has a benefitto the improvement of sulfur-tolerant performance ot the catalyst.The sulfur-tolerant performance of Pd-Pt/USYcatalyst is improved obviously in the presence of Pt.On the other hand, the higher dispersion ofPt on oxidic catalyst is a main reason for thc forming of more Pd-Pt alloy metal particles on the sulfidedcatalyst.

Key words: EXAFS, Pd-Pt/USY, Diesel, Deep hydrodearomatization, Sulfur tolerance

CLC Number:

O643

TrendMD:

YANG Jun, ZHANG Xi-Wen, HAN Chong-Ren, LU Guan-Zhong. EXAFS Characterization of Sulfur-tolerant Pd-Pt/USY Catalystfor Deep Hydrodearomatization of Diesel[J]. Chem. J. Chinese Universities, 2002, 23(4): 712.

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EXAFS Characterization of Sulfur-tolerant Pd-Pt/USY Catalystfor Deep Hydrodearomatization of Diesel

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