Rhodium metal catalysts dispersed on polyphosphine supports were employed in the hydrogenation of ethylene. The reaction was studied in a flow reactor at 395 K and 1 atm. Turnover numbers ranged between 5.8 × 10-3 and 145 × 10-3 (molecules/sec surface atom) depending on phosphorus content. Reaction orders for olefin and hydrogen were about 0.0 and 1.0, respectively. Correlations between specific activity N and phosphorus content for various samples are reported and suggest the existence of a strong phosphorus rhodium interaction which controls the catalytic activity. This was confirmed by chemisorption measurements and activation energy data. Typical activation energy values were 5 kcal/mol for phosphinated samples and 12 kcal/mol for nonphosphinated ones.
Highly dispersed rhodium/polyphosphine metal catalysts: Catalytic activity for ethylene hydrogenation / Pinna, F; Gonizzi, M; Strukul, G; Cocco, G; Enzo, Stefano. - In: JOURNAL OF CATALYSIS. - ISSN 0021-9517. - 82:1(1983), pp. 00219517.171-00219517.176.
Highly dispersed rhodium/polyphosphine metal catalysts: Catalytic activity for ethylene hydrogenation
ENZO, Stefano
1983-01-01
Abstract
Rhodium metal catalysts dispersed on polyphosphine supports were employed in the hydrogenation of ethylene. The reaction was studied in a flow reactor at 395 K and 1 atm. Turnover numbers ranged between 5.8 × 10-3 and 145 × 10-3 (molecules/sec surface atom) depending on phosphorus content. Reaction orders for olefin and hydrogen were about 0.0 and 1.0, respectively. Correlations between specific activity N and phosphorus content for various samples are reported and suggest the existence of a strong phosphorus rhodium interaction which controls the catalytic activity. This was confirmed by chemisorption measurements and activation energy data. Typical activation energy values were 5 kcal/mol for phosphinated samples and 12 kcal/mol for nonphosphinated ones.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.