Influence of alkali catalysts on the production of hydrogen-rich gas from the hydrothermal gasification of food processing waste

Muangrat, Rattana; Onwudili, Jude A.; Williams, Paul T.

doi:10.1016/j.apcatb.2010.08.019

Cited by 117 publications

(62 citation statements)

References 34 publications

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“…However, changes of CO and CO2 concentrations could be different since CO and CO2 were produced and consumed in parallel based on Eq. (7)- (11). For example, Corujo et al [31] reported that CO concentration was increased and CO2 concentration was decreased with the increase of Ni loading from 0.4 to wt.% [7], which is consistent with the promotion of the water-gas shift reaction (Eq.…”

Section: Equationsupporting

confidence: 66%

“…wind, hydropower, and biomass for commercial utilization [7][8][9][10]. Among these resources, biomass is abundantly available including cheap and non-food feedstocks, such as energy crops, agricultural residues, organic wastes, by-products from bio-refineries, wastes produced by the food industry and the biodegradable fraction of municipal solid waste [11,12]. From a technical point of view, sustainable hydrogen produced from biomass by thermochemical processes e.g.…”

Section: Introductionmentioning

confidence: 99%

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Promoting hydrogen production and minimizing catalyst deactivation from the pyrolysis-catalytic steam reforming of biomass on nanosized NiZnAlOx catalysts

Dong

Ling

et al. 2017

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Hydrogen production from the thermochemical conversion of biomass was carried out with nano-sized NiZnAlOx catalysts using a two-stage fixed bed reactor system. The gases derived from the pyrolysis of wood sawdust in the first stage were catalytically steam reformed in the second stage. The NiZnAlOx catalysts were synthesized by a co-precipitation method with different Ni molar fractions (5, 10, 15, 25 and 35%) and a constant Zn:Al molar ratio of 1:4. The catalysts were characterized by a wide range of techniques, including N2 adsorption, SEM, XRD, TEM and temperature-programmed oxidation (TPO) and reduction (TPR). Fine metal particles of size around 10-11 nm were obtained and the catalysts had high stability characteristics, which improved the dispersion of active centers during the reaction and promoted the performance of the catalysts. The yield of gas was increased from 49.3 to 74.8 wt.%, and the volumetric concentration of hydrogen was increased from 34.7 to 48.1 vol.%, when the amount of Ni loading was increased from 5 to 35%. Meanwhile, the CH4 fraction decreased from 10.2 to 0.2 vol.% and the C2-C4 fraction was reduced from 2.4 vol.% to 0.0 vol.%. During the reaction, the crystal size of all catalysts was successfully maintained at around 10-11 nm with lowered catalyst coke formation, (particularly for the 35NiZn4Al catalyst where negligible coke was found) and additionally no obvious catalyst sintering was detected. The efficient production of hydrogen from the thermochemical conversion of renewable biomass indicates that it is a promising sustainable route to generate hydrogen from biomass using the NiZnAl metal oxide catalyst prepared in this work via a two-stage reaction system.

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Section: Equationsupporting

confidence: 66%

Section: Introductionmentioning

confidence: 99%

Promoting hydrogen production and minimizing catalyst deactivation from the pyrolysis-catalytic steam reforming of biomass on nanosized NiZnAlOx catalysts

Dong

Ling

et al. 2017

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“…Also, the addition of Ca(OH) 2 to Ni could not shift the WGSR forward to increase H 2 yield because of the unavailability of Ca + to capture CO 2 . This deficiency is as a result of low decomposition of calcium formates at low supercritical temperatures [36]. The effects of the addition of Ni and K 2 CO 3 on the H 2 yield is interesting as it differs from results in recent studies by Muangrat et al [36] when only alkali catalysts were used to gasify glucose at 330°C and 13.5MPa.…”

Section: Effects Of Ni and Alkali Catalysts On H 2 Yieldcontrasting

confidence: 54%

Hydrogen production by supercritical water gasification of food waste using nickel and alkali catalysts

Amuzu-Sefordzi

Huang

Gong

2014

WIT Transactions on Ecology and the Environment

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Supercritical water gasification (SCWG) of food waste was carried out with nickel and alkali catalysts (NaOH, KOH, Ca(OH) 2 , Na 2 CO 3 , NaHCO 3 and K 2 CO 3 ). The food waste was comprised of a variety of food items. The experiment was performed in a batch reactor at supercritical water (SCW) conditions of 400°C and 22.1MPa for 10mins. Hydrogen (H 2 ) gas yield regarding the use of the catalysts was in the sequence; Ni-K 2 CO 3 > Ni-NaOH > Ni-KOH > Ni-NaHCO 3 > Ni > Ca(OH) 2 > Ni-Na 2 CO 3 > No catalyst. The results of this study indicate that using Ni was effective to support the steam reforming reaction. However its effects on the water gas shift reaction (WGSR) was little. Also carbon dioxide (CO 2 ) was the predominant gas product in the presence of metal carbonates and bicarbonate. As a result, H 2 selectivity was in the sequence, Ni-NaOH > Ni-KOH > Ni-K 2 CO 3 > Ni-Ca(OH) 2 > Ni > Ni-Na 2 CO 3 > NiNaHCO 3 > No catalyst. Furthermore, using 4g of NaOH was effective to shift the WGSR forward to produce a higher H 2 yield and selectivity than when 4g of Ni was used. However, when equal amounts of Ni and NaOH were used, the conversion of food waste into gaseous products was necessary to produce more H 2 during the WGSR.

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“…Extensive investigations have been carried out to screen suitable catalysts for hydrogen production from biomass gasification [1,3]. Among them, Ni-based catalysts have been reported as one of the most promising catalysts [4,5], since nickel-based catalyst are effective and comparatively cheaper compared with noble metal catalysts.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Steam Gasification of Biomass for a Sustainable Hydrogen Future: Influence of Catalyst Composition

Wang

et al. 2013

Waste Biomass Valor

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Hydrogen is regarded as a clean energy for fuelling the future. Hydrogen will be the energy carrier from other resources such as hydropower, wind, solar and biomass. Producing hydrogen from gasification of biomass wastes, particularly in the presence of steam, represents a promising route to produce this clean and CO 2 -neutral fuel. The steam pyrolysisgasification of biomass (wood sawdust) was carried out with various nickel-based catalysts for hydrogen production in a two-stage fixed bed reaction system. The wood sawdust was pyrolysed in the first reactor and the derived products were gasified in the second reactor in the presence of the catalyst and steam. The synthesised Ni-Ca-Al and Ni-Zn-Al catalysts were prepared by co-precipitation method with different Ni loadings of 20 mol.% and various Zn/Al or Ca/Al ratios, which were characterized with scanning electron microscopy (SEM), transmission electron microscopy (TEM) and temperature-programmed oxidation (TPO). The results showed that the Ni/Zn-Al (1:9) catalyst resulted in higher hydrogen production (23.9 mmol H 2 g -1 biomass) compared with the Ni/Ca-Al (1:9) catalyst (12.7 23.9 mmol H 2 g -1 biomass) and in addition, the increase of Ca or Zn content in the catalyst slightly increased the hydrogen production. The TPO results showed that the catalyst suffered negligible coke deposition from the catalytic steam pyrolysis/gasification of wood sawdust. Additionally, Na 2 CO 3 catalyst preparation agent was also found to produce a catalyst with better performance and lower coke deposition, compared with NH 4 OH catalyst preparation agent, as observed by TPO, SEM and TEM analysis.

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Influence of alkali catalysts on the production of hydrogen-rich gas from the hydrothermal gasification of food processing waste

Cited by 117 publications

References 34 publications

Promoting hydrogen production and minimizing catalyst deactivation from the pyrolysis-catalytic steam reforming of biomass on nanosized NiZnAlOx catalysts

Promoting hydrogen production and minimizing catalyst deactivation from the pyrolysis-catalytic steam reforming of biomass on nanosized NiZnAlOx catalysts

Hydrogen production by supercritical water gasification of food waste using nickel and alkali catalysts

Catalytic Steam Gasification of Biomass for a Sustainable Hydrogen Future: Influence of Catalyst Composition

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