Diffuse reflectance FT-IR study of the deactivation and reactivation of potassium carbonate-supported sodium catalysts for propene dimerisation

Journal Article · Wed Jul 01 04:00:00 UTC 1992 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1016/0021-9517(92)90107-S· OSTI ID:6999041

Harrison, P G; Goodyear, D ^[1]

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1. Univ. of Nottingham, University Park (United Kingdom)

Diffuse reflectance FT-IR has been used to investigate the chemical processes involved in the deactivation of Na/K{sub 2}CO{sub 3} propane dimerisation catalysts and their reactivation by treatment with hydrogen (hydriding). The data show that deactivation of the catalyst is due to the buildup of an involatile unsaturated hydrocarbon material on the surface of the Na/K{sub 2}CO{sub 3} catalyst. The deactivating hydrocarbon material is removed from the deactivated catalyst by hydriding at elevated temperatures, the rate of removal increasing with temperature. Hydriding initially produces a partially deuterated propene, which is converted to a partially deuterated propane with time. The origin of the deactivating hydrocarbon material is probably by polymerization of the equilibrium mixture of methyl acetylene and allene, which are formed by secondary processes during the dimerization of propene. Breakdown of the polymer backbone appears to be the process by which propene is formed during hydriding.

• OSTI ID: 6999041
• Journal Information: Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 136:1; ISSN 0021-9517; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400 -- Petroleum-- Processing
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKALI METAL COMPOUNDS
ALKALI METALS
ALKANES
ALKENES
CARBON COMPOUNDS
CARBONATES
CATALYSTS
CATALYTIC EFFECTS
CHEMICAL REACTIONS
DEACTIVATION
DEPOSITION
DEUTERIUM COMPOUNDS
DIMERIZATION
ELECTROMAGNETIC RADIATION
ELEMENTS
FOURIER TRANSFORMATION
HYDRIDATION
HYDROCARBONS
HYDROGEN COMPOUNDS
HYDROGENATION
INFRARED RADIATION
INTEGRAL TRANSFORMATIONS
METALS
OPTICAL PROPERTIES
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POLYMERIZATION
POTASSIUM CARBONATES
POTASSIUM COMPOUNDS
PROPANE
PROPYLENE
RADIATIONS
REACTION INTERMEDIATES
REFLECTIVITY
REGENERATION
SODIUM
SPECTROSCOPY
SURFACE PROPERTIES
SYNTHESIS
TRANSFORMATIONS