Steam Gasification of Coals with Calcium Hydroxide

Ohtsuka, Yasuo; Asami, Kōji

doi:10.1021/ef00054a016

Cited by 60 publications

(27 citation statements)

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“…DEM, showed a 65°C increase in temperature. The removal of alkaline earth metal species has caused this variation, as these metals are known to reduce the gasification temperature by up to 150°C [41]. For DEM, both T MAX and T E also shifted towards the higher end.…”

Section: Resultsmentioning

confidence: 99%

Intrinsic kinetics of CO2 gasification of a Victorian coal char

Kabir

Tahmasebi

Bhattacharya

et al. 2015

J Therm Anal Calorim

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CO 2 gasification of Victorian (Morwell) brown coal char was studied using a thermogravimetric analyser (TG). Gasification kinetics of demineralised, Ca-loaded, and Fe-loaded Morwell char were also studied. The grain model and random pore model were used to fit the gasification data. The random pore model fitted the experimental data better than the grain model. The activation energy was 189.05 kJ mol -1 for the CO 2 gasification of Morwell coal char. With 2 % Ca loading, the activation energy increased to 204.53 kJ mol -1 due to lowering of the surface area. However, an order of magnitude increase in the pre-exponential factor indicated an increase in active reaction sites for the 2 % Ca-loaded sample, resulting in a net increase in gasification rate. 5 % Ca loading and 2 % Fe loading proved to be less effective in increasing the gasification rate. Analysis of the TG outlet gas also proved the effectiveness of 2 % Ca loading as a gasification catalyst.

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Section: Resultsmentioning

confidence: 99%

Intrinsic kinetics of CO2 gasification of a Victorian coal char

Kabir

Tahmasebi

Bhattacharya

et al. 2015

J Therm Anal Calorim

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show abstract

“…Karimi [43] investigated the distribution of K, Na, Ca and Mg by scanning electron microscopy coupled with energy dispersive X-ray spectroscopy (SEM/EDX) and found that Ca and Mg were present in the coke particles only as relatively large distinct crystals either with little contact with the coke or trapped inside it, while the K and Na were spread relatively uniformly over the coke particles. Additionally, high-sulphur coals would result in the deactivation of the calcium catalyst, as the sulphur that evolved during pyrolysis or gasification would react with the calcium [41]. Additionally, high-sulphur coals would result in the deactivation of the calcium catalyst, as the sulphur that evolved during pyrolysis or gasification would react with the calcium [41].…”

Section: Figurementioning

confidence: 99%

Catalytic Coal Gasification

Huang

Zhang

Fan

et al. 2015

Sustainable Catalytic Processes

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“…These catalysts have been reported to be very active in tar removal [28][29][30], as the conversion of condensable hydrocarbons leads to an increase in gas yield [31]. Examples of inorganic ions that have been added to biomass are Na + , Li + , K + and Ca 2+ [31][32][33].…”

Section: Introductionmentioning

confidence: 99%