Kinetics of K-catalysed steam and CO2 gasification in the presence of product gases

Schumacher, Walter; Mühlen, H.-J.; Heek, K.H. van; Jüntgen, H.

doi:10.1016/0016-2361(86)90104-3

Cited by 27 publications

(27 citation statements)

References 2 publications

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“…In contrast, the activation energy was relatively constant for the mixtures with a catalyst to carbon ratio of 0.01, with the activation energy decreasing from 210 kJ/mol at 10% conversion to 180 kJ/mol at 90% conversion. Increased activation energy with increasing catalyst amounts has been reported in the literature [71,74]. As described in a previous publication from our group [71], the change in activation energy may be attributed to a change in the rate-determining step.…”

Section: Gasification Inhibitionsupporting

confidence: 69%

Effect of calcium and barium on potassium-catalyzed gasification of ash-free carbon black

Arnold

Hill

2019

Fuel

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Gasification of carbon black, an ash-free carbon feed, was performed with K2CO3 and either CaCO3 or BaCO3 as catalysts to examine their interaction. Mixtures were prepared by low-energy ball-milling, and then gasified with CO2 at 750-850 °C in a thermogravimetric analyzer. At temperatures below 800 °C, the presence of calcium had little impact on the potassium-catalyzed gasification of carbon black. At higher temperatures, calcium promoted the activity of potassium up to ~50 % conversion through the formation of a eutectic phase that increased the diffusivity of the potassium. At higher conversions, the tendency of CaCO3 to sinter and limit diffusion of CO2 to the carbon inhibited the reaction. BaCO3 also formed a eutectic phase with K2CO3 confirming that the phase change was beneficial. In contrast to CaCO3, however, BaCO3 does not sinter at 850 °C, such that gasification was promoted to complete conversion.

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Section: Gasification Inhibitionsupporting

confidence: 69%

Effect of calcium and barium on potassium-catalyzed gasification of ash-free carbon black

Arnold

Hill

2019

Fuel

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“…The positive effect of the steam pressure on the gasification of char obtained from coal, biomass, or other carbonaceous materials has also been observed by other authors (Pilcher et al, 1955;Rensfelt et al, 1978;Richard et al, 1985;Schumacher et al, 1986;van Tuyl and Thomson, 1986). The effect of pressure is most noticeable at low steam partial pressure.…”

mentioning

confidence: 52%

Pyrolysis/gasification of wood in a pressurized fluidized bed reactor

Chen¹,

Sjöström²,

Björnbom³

1992

Ind. Eng. Chem. Res.

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The paper deals with pyrolysis and steam gasification of wood in a pressurized fluidized bed reactor. The objective is to study the effect of the treatment conditions on the yield and the reactivity of char. The work shows that in the studied range of the experimental conditions the yield of char is influenced by neither the treatment temperature nor the pressure (650-710 "C and 0.34-1.0 ma). The principal interest is focused on the reactivity of the char in the reaction with steam. It is shown that prolonged exposure of char to high temperature has a negative effect on ita reactivity in steam gasification. Char produced by pyrolysis of wood in nitrogen is much less reactive in the following gasification reaction with steam compared to the char produced in simultaneous pyrolysis/gasification of wood in the presence of steam.

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“…So far, a number of intensive works have been carried out to investigate the catalytic mechanism of coal/char gasification [15][16][17][18][19][20][21][22][23]. However, few studies have mentioned the catalytic effects on reactivity of biomass-derived char and on gaseous products.…”

Section: Introductionmentioning

confidence: 98%

Catalytic effects of potassium on lignin steam gasification with γ-Al2O3 as a bed material

Kuchonthara

Vitidsant

Tsutsumi

2008

Korean J. Chem. Eng.

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The effects of potassium on the reactivity of biomass-char steam gasification with the presence of a porous material were investigated by using a thermogravimetric reactor with high-heating rates. Lignin was employed as a char-rich biomass model compound. The potassium carbonate (K 2 CO 3 ) was added to lignin and a mixture of lignin and γ-Al 2 O 3 porous particles by means of aqueous impregnation. The effects of K 2 CO 3 and γ-Al 2 O 3 addition on pyrolysis of lignin and steam gasification of lignin-derived char were evaluated in terms of lignin conversion and the gaseous products. Results showed that K 2 CO 3 slightly increased the steam gasification rate of lignin-derived char, but it did not influence the conversion in both the pyrolysis and steam gasification steps. In addition, tar was reduced by adding K 2 CO 3 because of the increment of carbon conversion to gas product. The presence of γ-Al 2 O 3 was found to induce the lower reactivity of resulting char after pyrolysis, reducing the gasification rate and conversion. A significant improvement in gasification conversion was observed with the presence of both K 2 CO 3 and γ-Al 2 O 3 . Especially, almost complete gasification was achieved at a reaction temperature of 1,073 K.

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Kinetics of K-catalysed steam and CO2 gasification in the presence of product gases

Cited by 27 publications

References 2 publications

Effect of calcium and barium on potassium-catalyzed gasification of ash-free carbon black

Effect of calcium and barium on potassium-catalyzed gasification of ash-free carbon black

Pyrolysis/gasification of wood in a pressurized fluidized bed reactor

Catalytic effects of potassium on lignin steam gasification with γ-Al2O3 as a bed material

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