Effects of headspace fraction and aqueous alkalinity on subcritical hydrothermal gasification of cellulose

Dolan, Ryan; Yin, Shu; Tan, Zhongchao

doi:10.1016/j.ijhydene.2010.04.029

Cited by 19 publications

(10 citation statements)

References 40 publications

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“…This reaction can also take place in HTW even without base or acid, due to inherent acid and base catalytic roles of HTW. , Therefore, under the alkaline hydrothermal conditions, cellulose may first be hydrolyzed into glucose, , which subsequently is used for the reduction of CuO. Moreover, it is known that hydrogen or syngas can be produced from the hydrothermal gasification of biomass under subcritical water conditions. − Therefore, there are two possible explanations for the reduction of CuO to Cu in the presence of cellulose. One explanation is that CuO is reduced by the glucose formed by the hydrolysis of cellulose.…”

Section: Resultsmentioning

confidence: 99%

Facile and Green Production of Cu from CuO Using Cellulose under Hydrothermal Conditions

Li¹,

Yao²,

Zeng³

et al. 2012

Ind. Eng. Chem. Res.

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A simple and green hydrothermal process has been developed to produce Cu from CuO using cellulose as a reductant under mild hydrothermal conditions. The results showed that CuO was easily reduced to Cu in the presence of cellulose, and a complete conversion of CuO into Cu was obtained at a temperature of 250 °C with a reaction time of 1.5 h in 0.50 mol/L NaOH. At the same time, cellulose was converted into value-added chemicals, such as lactic acid and acetic acid. A reaction mechanism for the reduction of CuO to Cu with cellulose as a reductant was also proposed.

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Section: Resultsmentioning

confidence: 99%

Facile and Green Production of Cu from CuO Using Cellulose under Hydrothermal Conditions

Li¹,

Yao²,

Zeng³

et al. 2012

Ind. Eng. Chem. Res.

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“…(2) The next step is the gasification of water-soluble depolymerized products over Pt/Al 2 O 3 in a catalytic reactor, producing H 2 , CO 2 , and CH 4 (eqn (11)). 174,175 Similarly, in the case of Pt/C catalyst in conversion of cellulose into hydrogen by aqueous phase reforming process, it was proposed that this process might involve slow hydrolysis of cellulose to glucose which was catalyzed by the H + reversibly formed in water during the reaction and followed by rapid reforming of glucose to H 2 . 176 Cellulose !…”

Section: Gasification Over Supported Noble Metal Catalystsmentioning

confidence: 99%

Catalytic conversion of lignocellulosic biomass to fine chemicals and fuels

et al. 2011

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Lignocellulosic biomass is the most abundant and bio-renewable resource with great potential for sustainable production of chemicals and fuels. This critical review provides insights into the state-of the-art accomplishments in the chemocatalytic technologies to generate fuels and value-added chemicals from lignocellulosic biomass, with an emphasis on its major component, cellulose. Catalytic hydrolysis, solvolysis, liquefaction, pyrolysis, gasification, hydrogenolysis and hydrogenation are the major processes presently studied. Regarding catalytic hydrolysis, the acid catalysts cover inorganic or organic acids and various solid acids such as sulfonated carbon, zeolites, heteropolyacids and oxides. Liquefaction and fast pyrolysis of cellulose are primarily conducted over catalysts with proper acidity/basicity. Gasification is typically conducted over supported noble metal catalysts. Reaction conditions, solvents and catalysts are the prime factors that affect the yield and composition of the target products. Most of processes yield a complex mixture, leading to problematic upgrading and separation. An emerging technique is to integrate hydrolysis, liquefaction or pyrolysis with hydrogenation over multifunctional solid catalysts to convert lignocellulosic biomass to value-added fine chemicals and bio-hydrocarbon fuels. And the promising catalysts might be supported transition metal catalysts and zeolite-related materials. There still exist technological barriers that need to be overcome (229 references).

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“…The two elementary reactions involving formic acid dehydration and decarboxylation are shown in Eqs. 9 and 10, respectively [18,21,32]. These reactions lead to a much lower concentration of formic acid, relative to levulinic acid.…”

Section: Qualitative Analysis By Hplcmentioning

confidence: 99%

“…The degradation pathway of the wood chips can be inferred based on the degradation products of glycolic acid and HMF (Fig. 11) [19][20][21][22][33][34][35]. During the hydrothermal treatment reactions, cellulose is first decomposed to form glucose, which can be converted to fructose (which is more reactive) via isomerization.…”

Section: Decomposition Mechanism Of Wood Chip Pyrolysismentioning

confidence: 99%

“…Therefore, this report describes hydrothermal liquefaction (HTL) treatments of wood chips under either an air or nitrogen atmosphere, and evaluates the effect of pressure and temperature on the yield of each product (HMF, glycolic acid, acetic acid, and other substances) [18]. The decomposition of furfural and HMF during hydrothermal treatments has been widely studied [19][20][21][22], but the mutual conversion between organic acids, such as acetic acid and glycolic acid, is rarely mentioned. This study also clarifies the conversion pathways between organic acids and elucidates the decomposition mechanism of lignocellulosic biomass in hydrothermal reactions under air and nitrogen conditions.…”

Section: Introductionmentioning

confidence: 99%

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Hydrothermal liquefaction of wood chips under supercritical and subcritical water reaction conditions

2021

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This work describes batch-type hydrothermal liquefaction (HTL) treatments of conifer wood chips at 180–425 °C, under either air or nitrogen atmosphere. Such experiments allow efficient extraction of 5-hydroxymethyl furfural (HMF) and other valuable chemical substances, such as glycolic acid and acetic acid, from the lignocellulosic biomass. These compounds and their decomposition products present in the samples after HTL are analyzed and quantified using spectroscopic and chromatographic techniques. In general, the relatively higher-pressure nitrogen atmospheric condition is more suitable for obtaining the desired products, relative to the air atmosphere. Based on the quantitative results, the optimal temperatures for producing acetic acid, glycolic acid, and HMF are 300 °C, 250 °C, and 180 °C, respectively. The interesting relationship between HMF yield and temperature is also discussed; as the temperature increases, the yield of HMF first decreases and then increases. This phenomenon is explained by the exothermic nature of the HMF decomposition reaction, which is inhibited by excessively high temperature (in the range from 380 to 425 °C). At moderately high temperatures (optimized conditions; 300 °C), the generation rate of HMF exceeds its decomposition rate, resulting in a high yield of HMF. Based on the results of the experiments conducted in this study, the decomposition mechanism describing HTL treatment of wood chips can be elucidated. This study therefore provides guidance for future work involving HMF extraction from lignocellulosic biomass.

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Effects of headspace fraction and aqueous alkalinity on subcritical hydrothermal gasification of cellulose

Cited by 19 publications

References 40 publications

Facile and Green Production of Cu from CuO Using Cellulose under Hydrothermal Conditions

Facile and Green Production of Cu from CuO Using Cellulose under Hydrothermal Conditions

Catalytic conversion of lignocellulosic biomass to fine chemicals and fuels

Hydrothermal liquefaction of wood chips under supercritical and subcritical water reaction conditions

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