Variation of rate during potassium-catalysed CO2 gasification of coal char

Hamilton, Robert T.; Sams, D. A.; Shadman, Farhang

doi:10.1016/0016-2361(84)90326-0

Cited by 38 publications

(36 citation statements)

References 5 publications

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“…According to mathematical analysis of RPM by Bhatia and Perlmutter [30], the position of the maximum rate should be restricted to the range 0≤X≤0.393. However, previous studies [34][35][36] have revealed that the peak rate can be shifted towards higher conversions due to the accumulation of metal catalyst on the char surface. The ash of the YB and SH chars are both rich in catalytic metals.…”

Section: Pore Structure Model Analysismentioning

confidence: 96%

Kinetic analysis of NO-Char reaction

Sun

Zhang

et al. 2009

Korean J. Chem. Eng.

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Two Chinese coals were used to prepare chars in a flat flame flow reactor which can simulate the temperature and gas composition of a real pulverized coal combustion environment. Acid treatment on the YB and SH chars was applied to obtain demineralized chars. Kinetic characterization of NO-char reaction was performed by isothermal thermogravimetry in the temperature range of 973-1,573 K. Presence of catalytic metal matter can increase the reactivity of chars with NO, which indicates that the catalytic effects of inherent mineral matter play a significant role in the NO-char reaction. The discrete random pore model was applied to describe the NO-char reactions and obtain the intrinsic kinetics. The model can predict the data for all the chars at various temperatures well, but underestimate the reaction rates at high carbon conversions for the raw YB and SH chars, which can be attributed to the accumulation of metal catalyst on char surface.

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Section: Pore Structure Model Analysismentioning

confidence: 96%

Kinetic analysis of NO-Char reaction

Sun

Zhang

et al. 2009

Korean J. Chem. Eng.

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“…Although the deviation from gasification behavior occurred in a high conversion region, Standish et al pointed out that it might emerge from a sudden disintegration of porous structure during gasification [28]. Hamilton et al proposed the reason for the reaction rate being at a maximum at around conversion of 0.7 was surface saturation of biomass char by the alkali catalyst [29]. This suggestion, however, is not consistent with other literature [30] on saturation effects in alkali-catalyzed gasification of biomass chars.…”

Section: Introductionmentioning

confidence: 98%

Effect of mineral matters in biomass on the gasification rate of their chars

Suzuki

Nakajima

Ikenaga

et al. 2011

Biomass Conv. Bioref.

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In order to develop the effective utilization of biomass, the gasification behavior (changes in gasification rates against conversion) of various chars prepared from biomass at 1,000°C was studied. The gasification rate of char with CO 2 measured at 900°C by a thermogravimetric balance was affected by the content of indigenous mineral matter such as calcium and potassium. The gasification behavior of chars were classified into following three groups: (1) the gasification rate reached a maximum in the higher conversion region, (2) the gasification rate profile showed two peaks around char conversion of 0.2 and 0.6 or higher, (3) the gasification rate profile fitted the random pore model. An increase in the gasification rate in a higher char conversion region was attributed to the promotion effect of the potassium catalyst. The number of active centers in the char was obtained by the O 2 uptake at 200°C using pulse technique. The number of active sites was increased by potassium and calcium in biomass and the amount of O 2 uptake well correlated the char gasification rate.

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“…Ni-based catalysts [29][30][31], used in catalytic coal gasification, ceria-zirconia catalysts do not catalyze the methanation reaction when mixed with carbon [12,30,32,33] and thus syngas yields remain high.…”

Section: Discussionmentioning

confidence: 99%

“…Nickel on alumina based catalysts have been used in the industry for naphtha and natural gas reforming for many years and it was therefore also logical to test them for biomass gasification applications. Caballero et al [25] and Simell et al [29] have been able to effectively eliminate the tars in the biomass derived gas and realizing a significant decrease of methane using crushed and/or as-received commercial catalyst or dedicated monolith beds. For complete tar and methane elimination, only downstream secondary reactors after the gasifier have been successful in creating a clean gas.…”

Section: Biomass Catalytic Gasification/steam Reformingmentioning

confidence: 99%

“…Two commercial naphtha/C 2 -C 3 steam reforming catalysts (UCI G90C and the ICI 46-series) showed very promising results in their ability to convert the aqueous soluble phase of pyrolysis oil with only minor coking at high steam over carbon ratios (20)(21)(22)(23)(24)(25)(26)(27)(28)(29)(30) [33]. However, an increase of methane concentration during a test could be observed.…”

Section: Catalytic Gasification/steam Reforming Of Pyrolysis Oil (Framentioning

confidence: 99%

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Steam reforming and gasification of pyrolysis oil : reactor and process development for syngas production from biomass

Rossum¹

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Variation of rate during potassium-catalysed CO2 gasification of coal char

Cited by 38 publications

References 5 publications

Kinetic analysis of NO-Char reaction

Kinetic analysis of NO-Char reaction

Effect of mineral matters in biomass on the gasification rate of their chars

Steam reforming and gasification of pyrolysis oil : reactor and process development for syngas production from biomass

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