Structure sensitivity of acetylene-ethylene hydrogenation over Pd catalysts

Journal Article · Tue Apr 01 00:00:00 EST 1986 · J. Catal.; (United States)

DOI:https://doi.org/10.1016/0021-9517(86)90343-X· OSTI ID:5327204

Sarkany, A; Weiss, A H; Guczi, L

Pd-Based catalysts are used for the selective hydrogenation of alkynes and alkadienes to the corresponding alkenes on a large scale. Addition of Pb and Zn (Lindlar type catalysts) to Pd, and alloying of Pd with Ag, Cu, Pb improve the selectivity of alkyne hydrogenation. The presence of organic bases organic sulfides, or CO in the reaction mixture is known to inhibit hydrogenation of the alkene formed. Although structure sensitivity in alkene hydrogenation has been systematically investigated, only a few studies have been devoted to the effect of metal dispersion on the selectively of hydrogenation of an alkyne-alkene mixture. The work described in this article aimed to investigate the effect of Pd dispersion on the competitive hydrogenation of a mixture containing 0.3% C/sub 2/H/sub 2/, 0.5% H/sub 2/ balanced by C/sub 2/H/sub 4/ over Pd/alumina as catalyst. In particular, attempts have been made to clarify the extent of ethane formation produced directly from acetylene (intrinsic selectivity of the ethane formation) and that from ethylene in the presence of acetylene with the use of (/sup 14/C)C/sub 2/H/sub 2/. Isotopic labeling techniques have unambiguously demonstrated that ethane is generally formed from both acetylene and ethylene. 30 references.

• Research Organization: Institute of Isotopes, Budapest (Hungary)
• OSTI ID: 5327204
• Journal Information: J. Catal.; (United States), Vol. 98:2
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
ACETYLENE
HYDROGENATION
ETHANE
SYNTHESIS
ETHYLENE
PALLADIUM
CATALYTIC EFFECTS
DISTRIBUTION
ALUMINIUM OXIDES
CATALYST SUPPORTS
CHEMICAL PREPARATION
CHEMICAL REACTION KINETICS
ALKANES
ALKENES
ALKYNES
ALUMINIUM COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
ELEMENTS
HYDROCARBONS
KINETICS
METALS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PLATINUM METALS
REACTION KINETICS
TRANSITION ELEMENTS
020400* - Petroleum- Processing