Some features of acetylene and 1,3-butadiene hydrogenation on Ag/SiO2 and Ag/TiO2 catalysts

Hydrogenation of ethylene, propene (Pr), 1-butene (1B), acetylene and 1,3-butadiene (BD) was investigated over 1.74 wt.% Ag/SiO(2) and 0.67 wt.% Ag/TiO(2) catalysts in temperature range between 333 and 423 K. The catalysts were prepared by wetting SiO(2) with aqueous solution of AgNO(3) and by adsorption of silver ions on TiO(2). After O(2) and H(2) treatments the catalysts hydrogenated ethene from about 313-323 K in a pulse microreactor system. Hydrogenation of acetylene, propene, 1,3-butadiene and 1-butene was tested in a recirculation batch reactor at 323-383 K. Acetylene hydrogenation gave mainly ethene accompanied with only limited formation of oligomers (C4+). Hydrogenation of 1,3-butadiene yielded mostly 1-butene and the cis/trans ratio in the 2-butenes was observed between 2 and 5 on Ag/SiO(2). In competitive hydrogenation of butadiene and propene mixtures 1,3-butadiene could not entirely suppress hydrogenation of propene. (C) 2002 Elsevier Science B.V. All rights reserved.