萘在贵金属Pd、Pt 及Pd-Pt 催化剂上的加氢活性及耐硫性能

doi:10.3866/PKU.WHXB20101006

Abstract

Abstract:

Monometallic Pd and Pt as well as bimetallic Pd:Pt catalysts (Pd₁Pt₁, Pd₁Pt₄, and Pd₄Pt₁) with Pd/Pt molar ratios of 1:1, 1:4, and 4:1 supported on SiO₂-Al₂O₃ were prepared by incipient-wetness impregnation and characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), CO chemisorption, and X-ray photoelectron spectroscopy (XPS). Their catalytic activities toward naphthalene hydrogenation and the sulfur tolerance of these catalysts were investigated. We found that naphthalene conversion, selectivity toward decalin, and the trans-/cis-decalin yieldratio on Pd₄Pt₁were 98.2%,93.6%,and 7.8,respectively,which are higher than those on Pd(97.5%,59.1%, 4.3) and Pt (96.8%, 39.9%, 2.9). The rate of naphthalene hydrogenation on the three catalysts increased according to: v_Pd₄Pt₁>v_Pd>v_Pt. In the presence of dibenzothiophene (DBT), the naphthalene conversion and selectivity toward decalin for Pd₄Pt₁ were still the highest. The trans-/cis-decalin ratio was not affected on the Pt catalyst, but it did decrease slightly on Pd₄Pt₁ and it decreased observably on the Pd catalyst. The Pd₄Pt₁ catalyst also presented the highest naphthalene conversion and selectivity toward decalin among the three bimetallic catalysts studied in the presence and absence of DBT.

Key words: Noble metal, Naphthalene, Hydrogenation, Sulfur tolerance, trans-/cis-decalin yield ratio

ZHANG Xiao-Fei, SHAO Zheng-Feng, MAO Guo-Qiang, HE De-Min,ZHANG Qiu-Min, LIANG Chang-Hai. Naphthalene Hydrogenation Activity over Pd, Pt and Pd-Pt Catalysts and Their Sulfur Tolerance[J]. Acta Phys. -Chim. Sin. 2010, 26(10), 2691-2698. doi: 10.3866/PKU.WHXB20101006

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Naphthalene Hydrogenation Activity over Pd, Pt and Pd-Pt Catalysts and Their Sulfur Tolerance

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