Interactions of reactants in hydration of acetylene on Cd-zeolite catalysts

IR measurements were carried out with Cd-MFI and Cd-clinoptilolite at 25 degrees C. Samples of different water content were contacted with acetylene at different pressures. Adsorbed acetaldehyde was formed from acetylene and water both adsorbed on similar Cd(2+)Z(2)(-) sites. The reaction between the two adsorbed reactants reveals the validity of Langmuir-Hinshelwood kinetics. Decrease of water content or increase of acetylene pressure facilitated the formation of carbonaceous deposits especially in the case of Cd-MFI. Deposits formed from acetylene displace adsorbed acetylene and acetaldehyde.