Acetylene hydrogenation on sol-derived Pd/SiO2

被引：29

作者：

Sárkány, A

Beck, A

Horváth, A

Révay, Z

Guczi, L

机构：

[1] Hungarian Acad Sci, Chem Res Ctr, Inst Isotope & Surface Chem, Dept Surface Chem & Catalysis, H-1525 Budapest, Hungary

[2] Hungarian Acad Sci, Chem Res Ctr, Inst Isotope & Surface Chem, Dept Phys Nucl, H-1525 Budapest, Hungary

来源：

APPLIED CATALYSIS A-GENERAL | 2003年 / 253卷 / 01期

基金：

匈牙利科学研究基金会;

关键词：

Pd sol; PDDA polycation; acetylene hydrogenation; competition;

D O I：

10.1016/S0926-860X(03)00506-4

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Pd/SiO2 (1.08 wt.%) catalyst has been synthesised via sot-derived route using poly(diallyldimethylammonium chloride) (PDDA) polycation as ionic stabiliser. The immobilised sot (monomer/Pd2+ = 1.25) fixed at pH = 8.5 onto Aerosil 200 contains Pd particles of 3.1 nm number-mean diameter. The catalyst prepared was subjected to various treatments and the obtained samples were characterised by transmission electron microscopy (TEM), CO and O-2 chemisorption, and temperature programmed oxidation (TPO) and temperature programmed desorption (TPD). The immobilised sot showed good thermal stability but oxidation of PDDA to get "polymer free" sample causes sintering of Pd particles. Initial activities and product selectivities for hydrogenation of acetylene in propene were recorded. The immobilised sample even in "as prepared state" possesses hydrogenation activity. Treatments at different temperatures in H-2 or Ar enhance the catalytic activity suggesting an increase in space around the metal particle. The PDDA modified sample exhibits better competition selectivity than the "polymer free" sample pointing to surface structure variations caused by geometric/steric effects. (C) 2003 Elsevier B.V. All rights reserved.

引用

页码：283 / 292

页数：10

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