Kinetic study on catalytic gasification of a modified sludge fuel

Zhu, Xueyan; Song, Bang-Ho; Kim, Dookie; Kang, Sungku; Lee, Seungjae; Jeon, Seokku; Choi, Young-Tai; Byoun, Yoonseop; Moon, Woonsig; Lee, Joonghee; Kim, Hong-Gun; Lee, Hongki; Shim, Joongpyo

doi:10.1016/j.partic.2008.04.003

Cited by 12 publications

(1 citation statement)

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“…According to our previous study on the kinetics of the carbonation reaction with CaO‐based sorbents, a temperature of 675 °C was found to be optimal and was therefore added to the experimental temperatures. Since K 2 CO 3 decomposes at 890 °C, we chose 750 °C as the maximum gasification temperature. It is worth mentioning that potassium oxide (K 2 O) also acts as a promoter for the adsorption of CO 2 by CaO …”

Section: Resultsmentioning

confidence: 99%

Potassium‐catalyzed steam gasification of ash‐free lignite coal with CO₂ capture

et al. 2017

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The purpose of this research was to study steam gasification of ash-free coal integrated with CO 2 capture in the presence of a K 2 O catalyst for enhancement of the key water-gas shift reaction and promotion of hydrogen production. To achieve this goal, gasification experiments on ash-free coal (AFC) were carried out at varying temperatures (600, 650, 675, 700, and 750 8C) with a sorbent-to-carbon (CaO/C) ratio of 2 and a catalyst (K 2 O) loading of 0.2 g/g (20 weight percent (wt%)) in a fixed-bed reactor equipped with a gas chromatography analyzer. The sorbent-to-carbon (CaO/C) ratio of 2 is based on dry and ash-free basis. The CaO/C ratio and K 2 O wt% were chosen to maximize hydrogen production based on our previously determined optimal values. The AFC was originally extracted from raw lignite coal using organic solvents, which allowed the sorptionenhanced gasification to be conducted with minimal ash-catalyst interactions. The effect of temperature on the yield and the initial reaction rate were investigated. The optimal reaction temperature of 675 8C was determined. Carbon balance and final carbon conversions were calculated based on the residue analysis. Activation energy was also calculated using intrinsic kinetics of the reaction. In this study, using AFC offered the potential advantage of operating the gasification process with catalyst recycle.

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Section: Resultsmentioning

confidence: 99%