Selective Hydrogenation of Ethyne in Ethene-Rich Streams on Palladium Catalysts. Part 1. Effect of Changes to the Catalyst During Reaction

• Published in: Catalysis reviews. Science and engineering Vol. 48; no. 2; pp. 91 - 144
• Main Authors: Borodziński, Andrzej, Bond, Geoffrey C.
• Format: Journal Article
• Language: English
• Published: Colchester Taylor & Francis Group 01.07.2006; Taylor & Francis
• Subjects: Carbonaceous deposits; Catalysis; Catalysts; Chemistry; Deposition; Effect of PdC; Effect of β-PdH phase; Ethane; Ethene; Ethyne hydrogenation; Exact sciences and technology; General and physical chemistry; Hydrogenation; Palladium; Palladium catalysts; phase; Phases; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Palladium catalysts; Ethylene; Catalytic reactor; Transition metal; Palladium; Carbonaceous deposits; Review; Hydrogenation; Supported catalyst; Heterogeneous catalysis; Alumina; Platinoid; Ethyne hydrogenation; Catalyst; Effect of PdCx phase; Effect of β-PdH phase
• ISSN: 0161-4940; 1520-5703
• DOI: 10.1080/01614940500364909

The effect of various changes to the palladium catalyst during its stabilization in the course of the selective hydrogenation of ethyne-ethene mixtures (formation of hydride and carbide phases and of carbonaceous deposits) was reviewed. The deposits in the form of a carbonaceous overlayer on the palladium surface create sites at which selective ethyne hydrogenation to ethene can occur. The carbonaceous deposit on the support increases the selectivity to ethane formation by increasing the rate of ethene hydrogenation on support sites (spillover of hydrogen from metal to the support surface) and by decreasing the effective diffusivity of ethyne in the pores.