Catalytic gasification of lignin with Ni/Al2O3–SiO2 in sub/supercritical water

Guan, Qingqing; Mao, T.L.; Zhang, Qiulin; Miao, Rongrong; Ning, Ping; Gu, Junjie; Tian, Senlin; Chen, Qiuling; Chai, Xin‐Sheng

doi:10.1016/j.supflu.2014.10.015

Cited by 50 publications

(24 citation statements)

References 20 publications

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“…Guan et al studied the influence of temperature and reaction time and found that increasing the temperature from 450°C to 550°C increased the selectivity to hydrogen from 27% to 36% while the selectivity for carbon dioxide decreased from 60% to 50%. All gas yields were found to increase with time, however, the largest rates of increase occurred during the first 20 min.…”

Section: Methodsmentioning

confidence: 99%

“…The main products of hydrothermal gasification of alkaline lignin are hydrogen, methane and carbon dioxide. Carbon monoxide and ethane are also produced, but to a lesser extent . Yields for carbon dioxide are the highest ranging from 48.4% to 49.5% in the work of Guan et al and Azadi et al respectively.…”

Section: Methodsmentioning

confidence: 99%

“…Carbon monoxide and ethane are also produced, but to a lesser extent . Yields for carbon dioxide are the highest ranging from 48.4% to 49.5% in the work of Guan et al and Azadi et al respectively. The yields reported for methane and hydrogen are much lower and range between 2–5.6% and 1.8–6.8% respectively …”

Section: Methodsmentioning

confidence: 99%

“…Nickel catalysts are especially relevant for gasification of lignin and have been found to contribute to an improved selectivity for hydrogen. However, the overall efficiency of lignin gasification is still low, producing mainly carbon dioxide while requiring high working temperatures (380–550°C) . Therefore, the economic potential for hydrothermal gasification of lignin is still limited.…”

Section: Methodsmentioning

confidence: 99%

See 3 more Smart Citations

Hydrotreating and hydrothermal treatment of alkaline lignin as technological valorization options for future biorefinery concepts: a review

Rutten

Ramírez

Posada

2016

J of Chemical Tech & Biotech

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Lignin has the potential to be a sustainable resource for producing biobased chemicals (e.g. phenols, aromatic hydrocarbons, vanillin) for multiple applications. However, given its heterogeneous and rigid structure, its efficient conversion to value‐added products remains one of the most important limiting factors for the successful viability of the biobased economy. Hydrotreating and hydrothermal treatment (including liquefaction, gasification and wet oxidation) are promising technologies that can convert lignin into biobased products. This review article provides a literature overview of how key process parameters of hydrotreating and hydrothermal treatment (operating conditions, catalysts, solvents, type of starting lignin) may influence the conversion of alkaline lignin into valuable chemical products. It was observed that low selectivity to products (and subsequent required separation and purification) and char formation are the main hurdles for effective conversion of alkaline lignin. However, experimental work in alternative catalytic systems, solvents and hydrogen sources has shown that promising opportunities exist to overcome these drawbacks. Certain catalysts (e.g. Ru/Al2O3) have been found to improve selectivity and the use of alcohol solvents (especially methanol or ethanol) as a hydrogen source has been found to improve product yields and reduce char formation at lower working temperatures and pressures. © 2016 Society of Chemical Industry

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Hydrotreating and hydrothermal treatment of alkaline lignin as technological valorization options for future biorefinery concepts: a review

Rutten

Ramírez

Posada

2016

J of Chemical Tech & Biotech

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“…Ding et al [228] reported that the Ni/CeO 2 /Al 2 O 3 catalyst was proved to increase a 30.7 % hygrogen yield compared to the non-catalytic run in the gasification of cellulose. The Ni/Al 2 O 3 -SiO 2 catalyst has been used in the catalytic gasification of lignin, and high catalytic activity in generating H 2 and CH 4 gas was exhibited in the sub/supercritical water [229]. Wu et al [230] researched the catalytic gasification of cellulose, hemicellulose and lignin in a two-stage fixed-bed reaction system using various nickelbased catalysts.…”

Section: The Gasification Of Biomass Feedstock Withmentioning

confidence: 99%

The Efficient and Sustainable Pyrolysis and Gasification of Biomass by Catalytic Processes

Tong

Chen

et al. 2015

ChemBioEng Reviews

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The biomass thermochemical conversion process includes two major approaches: pyrolysis and gasification. The advantages of pyrolysis and gasification of biomass feedstock in the presence of various catalyst systems are critically reviewed. The role of a catalyst in pyrolysis of biomass and its major components cellulose, hemicellulose and lignin is investigated. The discussion is focused on elucidating the reaction mechanisms involved in the formation of aromatics and phenols during catalytic pyrolysis. The pyrolysis performance of two major catalyst systems, metal-containing catalysts and zeolite catalysts, is analyzed. The impact of the catalyst on the deoxygenation efficiency is ascertained. In the catalytic gasification process, two major catalyst systems including alkali metals and noble metal catalysts are employed. This review illustrates the function of the catalyst in improving the yields of syngas and hydrogen and the mechanistic aspects of the reduction of tar and char formed during gasification. Ultimately, the review is intended to introduce the state of art in the biomass thermochemical conversion with an emphasis on the importance of the catalyst in producing value-added products.

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Catalytic Hydrotreatment of Humins in Mixtures of Formic Acid/2‐Propanol with Supported Ruthenium Catalysts

et al. 2016

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Catalytic gasification of lignin with Ni/Al2O3–SiO2 in sub/supercritical water

Cited by 50 publications

References 20 publications

Hydrotreating and hydrothermal treatment of alkaline lignin as technological valorization options for future biorefinery concepts: a review

Hydrotreating and hydrothermal treatment of alkaline lignin as technological valorization options for future biorefinery concepts: a review

The Efficient and Sustainable Pyrolysis and Gasification of Biomass by Catalytic Processes

Catalytic Hydrotreatment of Humins in Mixtures of Formic Acid/2‐Propanol with Supported Ruthenium Catalysts

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