By J.J. Spivey, G.W. Roberts, B.H. Davis
This lawsuits comprises the papers awarded on the ninth overseas Symposium on Catalyst Deactivation, held in Lexington, KY, united states, on 7-10 October 2001.
Read or Download Catalyst Deactivation 2001, Volume 139: Proceedings of the 9th International Symposium, Lexington, KY, USA, October 2001 PDF
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Extra resources for Catalyst Deactivation 2001, Volume 139: Proceedings of the 9th International Symposium, Lexington, KY, USA, October 2001
Sample text
The reduction of catalysts can lead to the chemisorption of 12DCP on metallic species, which enhances the adsorption capacity. Coke formation affects both adsorption and catalytic properties. With coke deposition, the pore volume and surface area can be reduced to great extent, resulting in a lower adsorption 28 capacity and in catalyst deactivation. In addition, coke formation decreases the selectivity to propene. The yielded HC1 might induce the re-dispersion of metallic species at the beginning of the reaction.
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It has been suggested that the production of ethylene occurs by hydrogen transfer between a monolayer of acetylene, strongly adsorbed on the metal surface, and acetylene interacting with this monolayer [7,8]. This strongly adsorbed monolayer can suffer polymerization to give a layer of hydrogenated coke. A probable mechanism is given in Scheme 2. Therefore, according to the suggested mechanisms, the presence of three atom arrangements to selectively hydrogenate acetylene into ethylene is not desirable.