Catalytic Coal Gasification

Huang, Xingliang; Zhang, Fan; Fan, Maohong; Wang, Yangang

doi:10.1016/b978-0-444-59567-6.00007-8

Cited by 14 publications

(8 citation statements)

References 75 publications

(70 reference statements)

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“…The catalytic activation of carbonaceous precursors by metals involves reactions similar to those that occur in the catalytic gasification of coal or other carbon-based materials. 13,14 Transition metals, such as Ni, Fe, and Cr, are usually applied in coal and carbon gasification processes. 15,16 However, the aim of catalytic activation is to stop the reaction once a high surface area or pore volume is obtained, without gasifying all of the carbon.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, the functional groups can act as nucleation centers for metallic crystallites, leading to high metal dispersions. , These properties suggest the possibility of metal impregnation of activated petcoke to yield highly dispersed metals on the carbon that can then be used in catalytic gasification to generate mesoporous carbons. The catalytic activation of carbonaceous precursors by metals involves reactions similar to those that occur in the catalytic gasification of coal or other carbon-based materials. , Transition metals, such as Ni, Fe, and Cr, are usually applied in coal and carbon gasification processes. , However, the aim of catalytic activation is to stop the reaction once a high surface area or pore volume is obtained, without gasifying all of the carbon. As noted by Wu et al, Ni and Cr, initially present in petcoke, can act as catalysts to facilitate activation and pore development.…”

Section: Introductionmentioning

confidence: 99%

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Esterification over Acid-Treated Mesoporous Carbon Derived from Petroleum Coke

et al. 2019

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Multistep activation of a Canadian oilsands petroleum coke that yields an acidified mesoporous carbon catalyst is reported. Microporous-activated carbon (APC; ∼2000 m 2 /g), obtained by thermochemical activation of petroleum coke using KOH, was impregnated with ammonium heptamolybdate and activated by carbothermal hydrogen reduction (CHR). The resulting Mo 2 C, supported on high-mesopore volume ( V meso ∼0.4 cm 3 /g) carbon, yields the desired mesoporous carbon catalyst ( V meso ∼0.7 cm 3 /g) following acid washing. The effect of CHR temperature and the benefit of Mo 2 C loading on mesopore development is reported, and pore development models are discussed. The mesoporous carbons are active for the esterification of acetic acid and 1-butanol at 77 °C, and the butanol conversion correlates with the catalyst acidity, as measured by NH 3 -TPD.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Esterification over Acid-Treated Mesoporous Carbon Derived from Petroleum Coke

et al. 2019

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“…Because of that numerous works aimed at improving gasification process are conducted. The use a variety of gasifying agents, operating conditions, types of fuel as well as catalysts are analyzed [2][3][4][5][6][7]. This research is particularly important in the case of fluidized bed reactors operating at low temperatures, where the high reactivity of the fuel is essential to ensure the efficient course of the process.…”

Section: Introductionmentioning

confidence: 99%

The influence of catalytic additives on kinetics of coal gasification process

2017

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Abstract. Catalytic coal gasification is a process that has the potential to become one of the efficient industrial technology of energy production. For this reason, the subject of this study was to analyze the kinetics of catalytic gasification of 'Janina' coal with steam. Isothermal measurements were performed at 800 °C, 900 °C, 950 °C and 1000 °C at a pressure of 1 MPa using cations of sodium, potassium and calcium as catalysts. During examination the thermovolumetric method was used. This method allows to determine the formation rates of a gaseous product such as carbon monoxide, hydrogen, methane and carbon dioxide as well as their contribution to the resulting gas. Moreover, the influence of catalysts on the kinetics of CO and H2 formation at various temperatures was determined and the kinetics parameters were calculated with the use of isoconversional model, Random Pore Model and Grain Model. The obtained results confirmed the positive effect of catalysts on the coal gasification process. The catalytic measurements were characterized by higher reaction rate and shorter duration of the process, and the calculated values of the kinetic parameters were lower than for the gasification process without the addition of catalysts.

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“…However, the second function of alkali salt catalysts, enhancing gasification efficiency, seems to show the effectiveness from various aspects. 19 The present conclusions about the catalytic mechanism are mostly corresponding to the conventional gasification research studies as the alkali salts show the same 20 reviewed and classified the catalytic mechanisms as the oxygen transfer mechanism, electrochemical mechanism, free radical mechanism, and other intermediates' mechanism. The alkaline condition caused by the alkaline salts is believed to be important for high carbon conversion, 3,10 but Li et al 21 found that the reaction catalyzed by neutral KCl and KNO 3 had higher conversion than that catalyzed by alkaline K 2 CO 3 and KAC in char steam gasification, suggesting that alkaline metals themselves also accelerate gasification.…”

Section: Introductionmentioning

confidence: 57%

Effects of Alkaline Metals on the Reactivity of the Carbon Structure after Partial Supercritical Water Gasification of Coal

Wang

Zhang

et al. 2020

Energy Fuels

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Conversion of coal, biomass, and organic waste to combustible gases H 2 and CH 4 in supercritical water (SCW) is an economically and environmentally favored technology. Homogeneous alkaline catalysts are commonly added to achieve high conversion efficiency, as alkalis are believed to accelerate the gasification of aromatic structures, which is the bottleneck of the whole gasification process. Nevertheless, the mechanism of how alkali metals influence the reaction of aromatic structures is still not acknowledged clearly. In this work, different pretreatments of the high-alkali metal content Zhundong coal are taken as the object to study the effect of naturally present and artificial additive alkali metals on the microcrystalline carbon structure and their reactivity with H 2 O during the supercritical water gasification (SCWG) process. XRD analysis was applied to reveal that alkali metals inhibit the growth of graphite-like structures during SCWG. Subsequently, the separated smaller sized aromatic structures are indicated by calculating the Fukui function values of peripheral carbon atoms to exhibit higher reactivity with H 2 O and the free radicals in SCW. Finally, the existence of alkali metals is proven to promote the strong chemisorption of H 2 O on carbon structures, which is the premise of carbon abstraction of the aromatics, via thermogravimetric analysis. The influence of different reactors and SCW is also involved in the discussion. This work is prospective for optimal utilization of the homogeneous catalysts and developing innovative catalysts.

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Catalytic Coal Gasification

Cited by 14 publications

References 75 publications

Esterification over Acid-Treated Mesoporous Carbon Derived from Petroleum Coke

Esterification over Acid-Treated Mesoporous Carbon Derived from Petroleum Coke

The influence of catalytic additives on kinetics of coal gasification process

Effects of Alkaline Metals on the Reactivity of the Carbon Structure after Partial Supercritical Water Gasification of Coal

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