Kinetics and FTIR studies of hydrocarbon synthesis on Pd/ZSM5 catalysts. Final report

Technical Report · Wed Oct 15 04:00:00 EDT 1986

OSTI ID:7043461

Thomson, R; Wolf, E E

Hydrocarbon synthesis during CO hydrogenation over Pd/M-ZSM5 (M=H,Na,La) and Pd/SiO/sub 2/ has been investigated. Overall activity depended on the cation-exchanged form of the support and decreased in the order Pd/La-ZSM5 = Pd/Na-ZSM5 > Pd/H-ZSM5 > Pd/SiO/sub 2/. The zeolite-supported catalysts showed high selectivity towards saturated C/sub 2/-C/sub 6/ hydrocarbons, whereas Pd/SiO/sub 2/ favored methanol production. Increasing temperature and H/sub 2//CO feed ratio led to higher reaction rates, lower yields of C/sub 2/-C/sub 6/ products, and increased lighter hydrocarbons. A mechanical mixture of Pd/SiO/sub 2/ and Na-ZSM5 showed similar product distribution as Pd/Na-ZSM5. Infrared spectra of the catalysts under reaction conditions indicate the presence of adsorbed oxygenates on the zeolite. Changes in the IR bands during the initial stages of the reaction suggest that surface species on the zeolite are not methanol synthesis intermediates. The effects of various temperatures and H/sub 2//CO ratios on the spectra are small. The kinetic and infrared results indicate that C/sub 2/+ hydrocarbons synthesis over Pd/ZSM5 follows a bifunctional reaction pathway, involving methanol synthesis over Pd and conversion of methanol to hydrocarbons on the zeolite support. 33 refs., 15 figs., 3 tabs.

• Research Organization: Notre Dame Univ., IN (USA). Dept. of Chemical Engineering
• DOE Contract Number: FG22-84PC70788
• OSTI ID: 7043461
• Report Number(s): DOE/PC/70788-T5; ON: DE87001708
• Country of Publication: United States
• Language: English

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ALCOHOLS
BINDING ENERGY
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISORPTION
COHERENT SCATTERING
DATA
DIFFRACTION
ELEMENTS
ENERGY
ETHERS
EXPERIMENTAL DATA
HIGH TEMPERATURE
HYDROCARBONS
HYDROGENATION
HYDROXY COMPOUNDS
INFORMATION
INFRARED SPECTRA
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MATERIALS
MEDIUM PRESSURE
METALS
METHANOL
METHYL ETHER
MINERALS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PALLADIUM
PLATINUM METALS
RESEARCH PROGRAMS
SCATTERING
SEPARATION PROCESSES
SILICA
SILICON COMPOUNDS
SILICON OXIDES
SORPTION
SORPTIVE PROPERTIES
SPECIFICITY
SPECTRA
SURFACE PROPERTIES
SYNTHESIS
TEMPERATURE EFFECTS
TRANSITION ELEMENTS
X-RAY DIFFRACTION
YIELDS
ZEOLITES