Efficient hydrothermal conversion of cellulose into methane over porous Ni catalyst

Huo, Zhi Bao; Liu, Jian Ke; Yao, Guo Dong; Zeng, Xu; Luo, Jiang; Jin, Fangming

doi:10.1016/j.apcata.2014.10.058

Cited by 19 publications

(10 citation statements)

References 30 publications

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“…In addition, the HGE values obtained from the catalytic tests were in all cases greater than 100%, indicating that hydrogen from water contributed to the overall hydrogen gasification. Recently, Zhou et al [29] reported that a porous nickel catalyst was effective for methane production from cellulose in the presence of Zn, which produced the hydrogen gas required for the methanation reaction by its reaction with water. In other words, water served as the source of hydrogen for the methanation reaction catalysed by the porous nickel catalyst.…”

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confidence: 99%

Supercritical water gasification of RDF and its components over RuO2/γ-Al2O3 catalyst: New insights into RuO2 catalytic reaction mechanisms

Onwudili

2016

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Five samples, including a composite refuse derived fuel (RDF) and four combustible components of municipal solid wastes (MSW) have been reacted under supercritical water conditions in a batch reactor. The reactions have been carried out at 450 °C for 60 min reaction time, with or without 20 wt% RuO2/gamma-alumina catalyst. The reactivities of the samples depended on their compositions; with the plastic-rich samples, RDF and mixed waste plastics (MWP), giving similar product yields and compositions, while the biogenic samples including mixed waste wood (MWW) and textile waste (TXT) also gave similar reaction products. The use of the heterogeneous ruthenium-based catalyst gave carbon gasification efficiencies (CGE) of up to 99 wt%, which was up by at least 83% compared to the non-catalytic tests. In the presence of RuO2 catalyst, methane, hydrogen and carbon dioxide became the dominant gas products for all five samples. The higher heating values (HHV) of the gas products increased at least two-fold in the presence of the catalyst compared to non-catalytic tests. Results show that the ruthenium-based catalyst was active in feedstock steam reforming, methanation and possible direct hydrogenolysis of C-C bonds. This work provides new insights into the catalytic mechanisms of RuO2 during SCWG of carbonaceous materials, along with the possibility of producing high yields of methane from MSW fractions.Keywords: MSW, supercritical water gasification, ruthenium catalysis, mechanisms, methane * Corresponding Author. Tel.: +44 121 204 4703 Email address: j.onwudili@aston.ac.uk 2 IntroductionRapid urbanization and technological developments are largely responsible for the increasing generation of millions of tonnes of municipal solid wastes (MSW) in major cities around the world. MSW can be broadly classified into organic and inorganic fractions. Among the organic components of MSW, further classifications can be made into biodegradable and nonbiodegradable fractions. By far, food and garden wastes occupy a huge proportion of MSW but these are biodegradable and are often treated by anaerobic digestion (AD) to produce biogas, leading to complete mineralization. After the separation of recyclables, the mixture of nonreadily biodegradable organic components make up a combustible fraction of MSW, which can be made into solid recovered fuels (SRF) and refuse derived fuels (RDF), depending on the specification. The stringent regulations concerning the production and utilization of SRF and RDF indicate that many components of MSW cannot be directly burned as fuels [1][2]. Massproduced synthetic polymers such as plastics and textile materials fall into the category of combustible MSW fractions [3]. Other organic components of MSW that do not hold huge attractions for AD operators include waste wood and reinforced cardboards.Advanced thermochemical technologies suitable for treating plastics and other combustible organic wastes and materials include incineration, pyrolysis and gasification. These technologies convert organic ...

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confidence: 99%

Supercritical water gasification of RDF and its components over RuO2/γ-Al2O3 catalyst: New insights into RuO2 catalytic reaction mechanisms

Onwudili

2016

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“…In the conversion of cellulose into 5-HMF, although homogeneous acid catalysts such as enzymes, mineral salts or acids, and supercritical water can overcome the resistance to degradation of cellulose for preparation of high-value chemicals, serious drawbacks for product separation, corrosion hazard, waste fluids, and severe reacting conditions are emerged obviously ( Güell et al, 2015 ; Wang et al, 2021a ; Chai et al, 2021 ). As compared to homogeneous acid catalysts, heterogeneous acid catalysts showing many merits, such as efficient conversion and selectivity, flexible separation, and low toxicity, have been extensively and popularly applied to industrial production and scientific research ( Huo et al, 2015 ; Sun et al, 2016 ; Tan X. et al, 2021 ). To further understand the role of a heterogeneous acid catalyst in biomass conversions, exploring the mechanism of product 5-HMF converted from cellulose is favorable for novel catalyst design and improvement of hydrothermal conversion for biomass.…”

Section: The General Pathway For Conversion Of Cellulose Into 5-hydro...mentioning

confidence: 99%

Sustainable Approaches to Selective Conversion of Cellulose Into 5-Hydroxymethylfurfural Promoted by Heterogeneous Acid Catalysts: A Review

2022

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5-Hydroxymethylfurfural (5-HMF) as a triply catalytic product is a value-added refining chemical in industry production. 5-HMF as biomass feedstock enables to be transformed into other high-value industrial compounds, such as 2,5-furandicarboxylic acid (FDCA), 5-hydroxymethyl-2-furancarboxylic acid (HMFCA), 5-formyl-2-furancarboxylic acid (FFCA), 2,5-diformylfuran (DFF), 2,5-bis(aminomethyl)furan (BAMF), and 2,5-dimethylfuran (DMF). Hence, catalytic conversion of biomass into 5-HMF has been given much more attention by chemists. In this review, some latest studies about the conversion of cellulose to 5-HMF have been introduced systematically. Solid acids such as heterogeneous catalysts have been widely applied in the conversion of cellulose into 5-HMF. Therefore, some novel solid acids with Brønsted and/or Lewis acidic sites, such as sulfonated solid acids, carbon-based acids, and zeolite particles employed for biomass conversions are listed.

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“…In another work, porous Ni was employed as the catalyst for methane production. In the presence of Zn as reductant, the maximum CH 4 yield of 73.8% was achieved at 325 °C for 2 h, and the conversion of cellulose to CH 4 still remained good activity with gaseous hydrogen after three runs of transformation …”

Section: Introductionmentioning

confidence: 98%

“…In the presence of Zn as reductant, the maximum CH 4 yield of 73.8% was achieved at 325 °C for 2 h, and the conversion of cellulose to CH 4 still remained good activity with gaseous hydrogen after three runs of transformation. 22 There is no doubt that reducing reaction temperature and energy consumption is an important direction for biomass methanation by chemical methods. Although compared to the pyrolytic gasification, the catalytic hydrothermal method can achieve higher throughputs and energy efficiency at lower temperature, but it still suffers from the drawbacks of harsh reaction conditions (high temperature and pressure).…”

Section: Introductionmentioning

confidence: 99%

Direct Hydrogenolysis of Cellulose into Methane under Mild Conditions

et al. 2018

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CH 4 is a clean fuel due to the highest H/C atom ratio among the other hydrocarbon fuels, showing less carbon emission during combustion. The traditional CH 4 production by fermentation presents the obvious disadvantages of low CH 4 yield (50−75%) and high CO 2 emission (25−50%). Herein, an efficient direct conversion of cellulose to CH 4 was investigated by using several hydrogenation catalysts. The Ru/C catalyst showed the excellent catalytic performance among all the studied catalysts. The optimized reaction parameters including temperature, time, pressure, and catalyst dosage were further investigated by using Ru/C catalyst, and the maximum CH 4 yield of 88.1% was obtained at mild reaction conditions (220 °C and 1 MPa initial H 2 ). This value obtained is the highest yield for the production of CH 4 from cellulose to date. The reaction network suggests that the hydrolysis, hydrogenation, decarbonylation, retro-aldol reaction, and aqueous-phase-reforming are probably taking place, in which cellulose hydrolysis was proven to be the rate-determined step. This work provided an efficient approach to produce biomass derived CH 4 with extreme CO 2 emission (below 5%) and a better understanding of the cellulose hydrogenolysis process.

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Efficient hydrothermal conversion of cellulose into methane over porous Ni catalyst

Cited by 19 publications

References 30 publications

Supercritical water gasification of RDF and its components over RuO2/γ-Al2O3 catalyst: New insights into RuO2 catalytic reaction mechanisms

Supercritical water gasification of RDF and its components over RuO2/γ-Al2O3 catalyst: New insights into RuO2 catalytic reaction mechanisms

Sustainable Approaches to Selective Conversion of Cellulose Into 5-Hydroxymethylfurfural Promoted by Heterogeneous Acid Catalysts: A Review

Direct Hydrogenolysis of Cellulose into Methane under Mild Conditions

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