Highly efficient sulfur and coking resistance catalysts for tar gasification with steam

Srinakruang, Jumluck; Sato, Kazuhiro; Vitidsant, Tharapong; Fujimoto, Kaoru

doi:10.1016/j.fuel.2006.04.026

Cited by 98 publications

(61 citation statements)

References 13 publications

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“…Higher gas yield with the increase in steam flow rate was obtained because the higher steam flow rates promote steam reforming of tar and other hydrocarbons from the pyrolysis of the rice husk biomass leading to the higher gas yield [35,38]. The water gas reaction is also suggested to have played a role in enhancing the gas yield.…”

Section: Characterization Of Reacted Catalystsmentioning

confidence: 99%

Pyrolysis/reforming of rice husks with a Ni–dolomite catalyst: Influence of process conditions on syngas and hydrogen yield

Waheed

2016

Journal of the Energy Institute

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The influence of process conditions on the production of syngas and H2 from biomass in the form of rice husks was investigated using a two-stage pyrolysis-catalytic reforming reactor.The parameters investigated were, reforming temperature, steam flow rate and biomass particle size and the catalyst used was a 10 wt.% Ni-dolomite catalyst. Biomass was pyrolysed in the first stage, and the product volatiles were reformed in the second stage in the presence of steam and the Ni-dolomite catalyst. Increase in catalyst temperature from 850 °C to 1050 °C marginally improved total syngas yield. However, H2 yield was increased from 20.03 mmoles g -1 at 850 °C to 30.62 mmoles g -1 at 1050 °C and H2 concentration in the product gas increased from 53.95 vol.% to 65.18 vol.%. Raising the steam flow rate increased the H2 yield and H2 gas concentration. A significant increase in H2:CO ratio along with a decrease in CO:CO2 ratio suggested a change in the equilibrium of the water gas shift reaction towards H2 formation with increased steam flow rate. The influence of particle size on H2 yield was small showing an increase in H2 production when the particle size was reduced from 2.8 -3.3 to 0.2 -0.5 mm.

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Section: Characterization Of Reacted Catalystsmentioning

confidence: 99%

Pyrolysis/reforming of rice husks with a Ni–dolomite catalyst: Influence of process conditions on syngas and hydrogen yield

Waheed

2016

Journal of the Energy Institute

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“…From Figure 3 In this work, naphthalene has been included in the tar Class 4, which contributed significantly to the concentration of tar in the analysed samples ( Figure 3). Naphthalene has been reported as a major compound in tar samples from the pyrolysis and/or reforming process [24,62]. For example Abu El-Rub et al [63], used naphthalene and phenol as tar model compounds to measure tar reduction during the reforming process, using different catalyst types.…”

Section: Gc-ms Analysis Of Collected Tarmentioning

confidence: 99%

“…Ni/SiO 2 catalysts have been studied for methanol and ethanol reforming [18,23], and for tar reforming [24] giving a good performance. SiO 2 was chosen as the support because it produces a higher metallic surface area and higher sintering resistance compared with other oxide supports [25].…”

Section: Introductionmentioning

confidence: 99%

Characterization and evaluation of Ni/SiO2 catalysts for hydrogen production and tar reduction from catalytic steam pyrolysis-reforming of refuse derived fuel

Blanco

Onwudili

et al. 2013

Applied Catalysis B: Environmental

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A series of Ni/SiO 2 catalysts have been prepared and investigated for their suitability for hydrogen production and tar reduction in a two-stage pyrolysis-reforming system, using refuse derived fuel (RDF) as the raw material. Experiments were conducted at a pyrolysis temperature of 600 ºC, and a reforming temperature of 800 ºC. The product gases were analysed by gas chromatography (GC) and the condensed fraction was collected and quantified using gas chromatography-mass spectrometry (GC-MS). The effects of the catalyst preparation method, nickel content and the addition of metal promoters (Ce, Mg, Al), were investigated. Catalysts were characterised using BET surface area analysis, temperature programmed oxidation (TPO), and scanning electron microscopy (SEM). The TPO and SEM analysis of the reacted catalysts showed that amorphous type carbons tended to be deposited over the Ni/SiO 2 catalysts prepared by impregnation, while filamentous type carbons were favoured with the sol-gel prepared catalysts. The influence of catalyst promoters (Ce, Mg, Al) added to the Ni/SiO 2 catalyst prepared by the sol-gel method was found not to be significant, as the H 2 production was not increased and the tar formation was not reduced with the metaladded catalyst. The highest H 2 concentration of 57.9 vol.% and lower tar amount produced of 0.24 mg tar /g RDF ; were obtained using the 20 wt.% Ni/SiO 2 catalyst prepared by sol-gel. On the other hand a low catalytic activity for H 2 production and higher tar produced were found for the impregnated series of catalysts, which might be due to the smaller surface area, pore size and due to the formation of amorphous carbons on the catalyst surface. Alkenes and alcohol functional groups were mainly found in the analysed tar samples, with major concentrations of styrene, phenol, indene, cresols, naphthalene, fluorene, and phenanthrene.

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“…Srinakruang et al [18] also reported superior catalytic activity for a nickel dolomite catalyst compared to a nickel alumina catalyst. They reported that the Ni/dolomite catalyst showed excellent catalytic activity, durability and resistance to coke formation and sulfur poisoning in comparison with Ni/Al 2 O 3 and Ni/SiO 2 catalysts.…”

Section: 3effect Of Ni Contentmentioning

confidence: 99%

“…The fresh and reacted catalysts were characterized by scanning electron microscope (SEM) (LEO 1530) coupled to an energy dispersive X-ray spectrometer (EDXS). [18].…”

Section: 2catalyst Characterizationmentioning

confidence: 99%

High yield hydrogen from the pyrolysis–catalytic gasification of waste tyres with a nickel/dolomite catalyst

Elbaba

Williams

2013

Fuel

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Abstract:Nickel/dolomite catalysts have been prepared and investigated for their suitability for the production of hydrogen from the two-stage pyrolysis-gasification of waste tyres.Experiments were conducted at a pyrolysis temperature of 500 o C and gasification temperature was kept constant at 800 o C with a catalyst/ waste tyres ratio of 0.5. Fresh and reacted catalysts were characterized using a variety of methods, including, BET, X-ray diffraction (XRD), thermogravimetric analysis (TGA) and scanning electron microscopy (SEM)-energy dispersive X-ray spectrometry (EDXS). The results indicated that the gas yield was significantly increased from 30.3 to 49.1 wt.% and the potential H 2 production was doubled with the introduction of 5%Ni into the calcined dolomite catalyst. The results show also a further increase in the gas yield and the potential H 2 production with increasing Ni loading from 5 to 20 wt.%. The coke deposited on the catalyst surface was 3.2, 6.1, 7.9 and 10.1 wt.%, when the Ni loading was 0, 5, 10 and 20 wt.% for the calcined dolomite catalyst, respectively. The results showed that the calcined Ni dolomite catalysts became deactivated by filamentous carbons.

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Highly efficient sulfur and coking resistance catalysts for tar gasification with steam

Cited by 98 publications

References 13 publications

Pyrolysis/reforming of rice husks with a Ni–dolomite catalyst: Influence of process conditions on syngas and hydrogen yield

Pyrolysis/reforming of rice husks with a Ni–dolomite catalyst: Influence of process conditions on syngas and hydrogen yield

Characterization and evaluation of Ni/SiO2 catalysts for hydrogen production and tar reduction from catalytic steam pyrolysis-reforming of refuse derived fuel

High yield hydrogen from the pyrolysis–catalytic gasification of waste tyres with a nickel/dolomite catalyst

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