Catalytic effects of inherent alkali and alkaline earth metallic species on steam gasification of biomass

Jiang, Long; Su, Sheng; Wang, Lele; Su, Sheng; Sun, Lushi; Xu, Boyang; He, Limo; Xiang, Jun

doi:10.1016/j.ijhydene.2015.08.111

Cited by 170 publications

(56 citation statements)

References 40 publications

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“…Table 3 illustrated that the alkali and alkaline earth metals (AAEMs) (e.g., K, Na, Ca, Mg) in hydrochar was also higher than that of sewage sludge. According to Jiang et al [44], during steam gasification of biomass, the heterogeneous char-steam reaction and the homogeneous hydrocarbons reforming and water-gas shift reactions were promoted by the presence of AAEMs, resulting in an enhanced H 2 yield. Therefore, the enhanced syngas quality may be attributed to the high amount of AAEMs in hydrochar, which are known to act as catalysts during gasification.…”

Section: Gas Compositionmentioning

confidence: 99%

Hydrogen-rich gas production by steam gasification of hydrochar derived from sewage sludge

Gai

Guo

et al. 2016

International Journal of Hydrogen Energy

146

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Steam Alkali catalyst Hydrogen Hydrothermal carbonization a b s t r a c tHydrothermal carbonization is an effective pretreatment for further thermal conversion of high moisture biomass without a high cost of a dehydration process. The current paper concerns the properties of hydrochar derived from hydrothermal carbonization of sewage sludge, and the feasibility of steam gasification of hydrochar for hydrogen-rich gas production was investigated. Sewage sludge derived hydrochar was characterized using scanning electron microscopy, Fourier transform infrared spectroscopy, and inductively coupled plasma atomic emission spectroscopy to evaluate its feasibility for gasification application. The effect of reaction temperature, steam to biomass mass ratio, and addition of alkali catalysts on steam gasification characteristics of raw sewage sludge and corresponding hydrochar were evaluated, in terms of major composition of the produced gas, gas yield, gasification efficiency and energy density. The results showed that sewage sludge derived hydrochar was rich in hydrophilic functional groups and increased Fe, Ni, alkali and alkaline earth metals (i.e. K, Na, Ca, Mg), resulting in a higher hydrogen yield and energy efficiency than direct steam gasification of sewage sludge under identical conditions. In addition, hydrogen-rich gas production was also favored with the presence of alkali catalysts, especially for the hydrochar. The present study demonstrates that hydrothermal carbonization provides an effective pretreatment of sewage sludge for production of hydrogen-rich gas via steam gasification.

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Section: Gas Compositionmentioning

confidence: 99%

Hydrogen-rich gas production by steam gasification of hydrochar derived from sewage sludge

Gai

Guo

et al. 2016

International Journal of Hydrogen Energy

146

View full text Add to dashboard Cite

show abstract

“…The high contents of AAEMs in biochar are also known to act as catalysts during the gasification process. Jiang et al [42] reported that the presence of AAEMs promoted the heterogeneous char-steam reaction, hydrocarbons reforming and water-gas shift reactions during the steam gasification of biomass, and thus lead to an enhanced hydrogen concentration. However, a high content of Si and Al will inhibit the gasification process.…”

Section: Gasification Characteristicsmentioning

confidence: 99%

Gasification characteristics of hydrochar and pyrochar derived from sewage sludge

Gai

Chen

et al. 2016

Energy

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“…The Na, K, Mg and Ca are usually exchanged in carboxylate groups [7], which can affect the Ni loading and dispersity. Lignite has a certain catalytic activity in gasification reactions since the existence of high content of minerals [8][9][10]. The catalytic activity of minerals is dependent on their chemical form exists in the coal matrix, as well as the concentration and dispersion.…”

Section: Introductionmentioning

confidence: 99%

Preparation of high-dispersion Ni/C catalyst using modified lignite as carbon precursor for catalytic reforming of biomass volatiles

Ren

Cao

Zhao

et al. 2017

Fuel

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Catalytic effects of inherent alkali and alkaline earth metallic species on steam gasification of biomass

Cited by 170 publications

References 40 publications

Hydrogen-rich gas production by steam gasification of hydrochar derived from sewage sludge

Hydrogen-rich gas production by steam gasification of hydrochar derived from sewage sludge

Gasification characteristics of hydrochar and pyrochar derived from sewage sludge

Preparation of high-dispersion Ni/C catalyst using modified lignite as carbon precursor for catalytic reforming of biomass volatiles

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