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- W46034508 abstract "This research uses transient isotope tracing, at steady-state reaction conditions, in combination with surface analysis techniques (secondary ion mass spectrometry (SIMS) and x-ray photoelectron spectroscopy (XPS). Carbon dioxide gasification of carbon blacks and coal char will be used initially, since this appears to be rate-determining during steam gasification; steam gasification will be used in later experiments. In a typical isotope tracing experiment, /sup 12/CO/sub 2/ flow over a carbon-catalyst mixture will be quickly replaced by /sup 13/CO/sub 2/ at the same pressure and flow rate. The changes in the concentrations of /sup 12/CO and /sup 13/CO products, and in the /sup 12/CO/sub 2/ and /sup 13/CO/sub 2/ concentrations, as a function of time, will be measured with a computer-controlled mass spectrometer. The use of isotope transients allows the concentration of active catalytic sites to be measured directly at reaction conditions and it allows the rate constant to be measured. Isotope tracing will be carried out as a function of reaction temperature, catalyst loading, catalyst type and carbon conversion. Surface analysis techniques will be used to determine the active forms of the catalysts. Model studies of catalyst-carbon interactions will also be carried out with SIMS in order to determine the formmore » of surface species. The combination of isotope tracing and surface analysis will elucidate the details of the reaction mechanism. This insight into the mechanism of coal gasification will help in improving process kinetics for gasification. 1 fig.« less" @default.
- W46034508 created "2016-06-24" @default.
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- W46034508 date "1987-04-23" @default.
- W46034508 modified "2023-09-27" @default.
- W46034508 title "Catalytic coal gasification: Identification of active sites, January 15, 1987-April 14, 1987" @default.
- W46034508 hasPublicationYear "1987" @default.
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