Potassium-catalyzed steam gasification of petroleum coke for H2 production: Reactivity, selectivity and gas release

Wu, Youqing; Wang, Jianjian; Wu, Shao-Yi; Huang, Sheng; Gao, Jin‐Sheng

doi:10.1016/j.fuproc.2010.11.007

Cited by 109 publications

(57 citation statements)

References 40 publications

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“…So it could be assumed that the increased K content in the spent char600 might be due to the formation of the phenolate group (K−O−C) that bonded between the released K from rice straw and carbon matrix of coal char [25][26][27] . The phenolate group has been reported to be a catalytic species for carbon-steam reaction [27][28][29][30] . At the same time, the volatilization of AAEM over the coal char surfaces was promoted by the H-radicals which released from the thermal cracking of rice straw derived volatiles, following the reaction:…”

Section: Effect Of Coal Char On Rice Straw Pyrolysismentioning

confidence: 99%

“…Hosakai et al 35 reported that the catalytic activity of coal char could be maintained when the rate of coke gasification was higher than the rate of coke formation. The rate of coke steam gasification could be enhanced by the existence of AAEM remaining on char surfaces, in particular K 30,37 and Ca 20 . As mentioned above, the formation of phenolated group (K−O−C) between the volatile K from rice straw and coal char surfaces could be preferably formed over the char600 surfaces rather than char800 surfaces.…”

Section: Effect Of Coal Char On Rice Straw Steam Gasificationmentioning

confidence: 99%

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Biomass derived tar decomposition over coal char bed

Krerkkaiwan¹,

Tsutsumi²,

Kuchonthara³

2013

ScienceAsia

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The effect of coal char on the decomposition of rice straw derived tar was investigated in a two-stage fixed bed reactor. The reactor was divided into a pyrolysis zone (upper part) and a volatile-char contacting zone (lower part). Rice straw was pyrolysed at different temperatures in the upper part. Coal char, prepared by the pyrolysis of Indonesian coal at either 600°C (char600) or 800°C (char800), was located in the lower part. Volatiles from the rice straw (upper part) were produced and then came in contact with the coal char at the lower part under the N 2 (pyrolysis) or steam/N 2 (steam reforming) gas flow. Under pyrolysis, both char600 and char800 exhibited a catalytic effect on the thermal tar decomposition. The coal chars also played a significant catalytic activity on the decomposition of the heavy aromatic hydrocarbons that were generated at a high pyrolysis temperature. In the presence of steam, char600 also exhibited a catalytic role in tar steam reforming, while char800 did not reveal any such significant catalytic activity because of the predominant coke/carbon formation.

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Section: Effect Of Coal Char On Rice Straw Pyrolysismentioning

confidence: 99%

Section: Effect Of Coal Char On Rice Straw Steam Gasificationmentioning

confidence: 99%

Biomass derived tar decomposition over coal char bed

Krerkkaiwan¹,

Tsutsumi²,

Kuchonthara³

2013

ScienceAsia

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“…The use of the catalyst K2CO3 not only intensifies the kinetics of reactions R3, R6, and R7 (all of which are gaseous phase reactions), but it also greatly elevates the gasification selectivity toward CO2, especially at a starting temperature range of 700-750 o C (Wang et al, 2009;Wu et al, 2011). It should be noted that high gasification selectivity toward CO2 fosters a high H2 production The kinetics of the Boudouard reaction may be improved in steam gasification of coal if its ash composition is high (Villacampa et al, 2011) or when gasification is performed at a temperature greater than 700 o C (Matsumoto et al, 2009).…”

Section: Resultsmentioning

confidence: 99%

“…A syngas sample was taken from the sampling port every 10 minutes using a gas tight syringe for analysis and the gas chromatography-thermal conductivity detector (GC-TCD) technique to acquire data regarding the composition of H2, CO, CO2, and CH4. Based on GC-TCD data, the mole ratio of H2/CO, syngas yield, and carbon conversion were calculated using a method proposed by Wu et al (2011). Table 2 shows H2/CO ratios, carbon conversions, and syngas yields for each condition of steam gasification.…”

Section: Methodsmentioning

confidence: 99%

Catalytic Effect of K2CO3 in Steam Gasification of Lignite Char on Mole Ratio of H2/CO in Syngas

Tristantini¹,

Supramono²,

Suwignjo³

2015

IJTech

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To fulfill the requirement for synthetic fuel (synfuel) production in theFischer-Tropsch process, in which syngas fed to the process has a H2/CO mole ratio approaching 2, gasification of lignite coal is needed. In this research, char particles were prepared by pyrolysis of lignite coal at controlled heating rates to obtain the highest possible surface area for gasification. In the gasification process, char with a surface area of 172.5 m 2 /g was used, along with the catalyst K2CO3 in a fixed bed reactor. In this research, there were variations in the steam/char mass ratio Results of this research showed that the highest H2/CO mole ratio of 2.07 corresponding to the mole ratio of gas yield/carbon of 1.13 was achieved at the gasification temperature of 675 o C using the catalyst K2CO3; the steam/char mass ratio was 2.0. However, at the same gasification conditions-but without a catalyst-the H2/CO mole ratio and corresponding mole ratio of gas yield/carbon were 3.02 and 0.42, respectively. A finding of this research was that the addition of the catalyst K2CO3 to gasification of lignite char adversely reduced the mole ratio of H2/CO compared to gasification without catalysis. It is suspected that the high composition of mineral ash in coal ash reacted with the K2CO3 catalyst, thus causing the Boudouard reaction to compete considerably with the water-gas reaction. The increases in gasification temperature and the steam/carbon ratio lowered the mole ratio of H2/CO in syngas.

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“…It is also a base material of many chemical syntheses, in which many substances, both organic and inorganic may be produced [18]. Global hydrogen production comes mainly from fossil fuels processing without CCS (Carbon Capture and Storage) technologies: 48% from natural gas, 30% from the refinery off-gases, 18% from coal and the rest comes from electrolisys and biomass [19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Carbon dioxide emission in hydrogen production technology from coke oven gas with life cycle approach

2016

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Abstract. The analysis of Carbon Footprint (CF) for technology of hydrogen production from cleaned coke oven gas was performed. On the basis of real data and simulation calculations of the production process of hydrogen from coke gas, emission indicators of carbon dioxide (CF) were calculated. These indicators are associated with net production of electricity and thermal energy and direct emission of carbon dioxide throughout a whole product life cycle. Product life cycle includes: coal extraction and its transportation to a coking plant, the process of coking coal, purification and reforming of coke oven gas, carbon capture and storage. The values were related to 1 Mg of coking blend and to 1 Mg of the hydrogen produced. The calculation is based on the configuration of hydrogen production from coke oven gas for coking technology available on a commercial scale that uses a technology of coke dry quenching (CDQ). The calculations were made using ChemCAD v.6.0.2 simulator for a steady state of technological process. The analysis of carbon footprint was conducted in accordance with the Life Cycle Assessment (LCA).

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Potassium-catalyzed steam gasification of petroleum coke for H2 production: Reactivity, selectivity and gas release

Cited by 109 publications

References 40 publications

Biomass derived tar decomposition over coal char bed

Biomass derived tar decomposition over coal char bed

Catalytic Effect of K2CO3 in Steam Gasification of Lignite Char on Mole Ratio of H2/CO in Syngas

Carbon dioxide emission in hydrogen production technology from coke oven gas with life cycle approach

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