Biomass Gasification: Catalytic Removal of Tars over Zeolites and Nickel Supported Zeolites

Buchireddy, Prashanth R.; Bricka, R. Mark; Rodríguez, José M.; Holmes, William E.

doi:10.1021/ef901529d

Cited by 110 publications

(72 citation statements)

References 37 publications

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“…For enhanced catalytic performance and thermal stability, various supports (such as, zeolites [4,5,7,28,29], dolomite [1,22,30,31], olivine [21,32], other metal and metal oxides such as La, Fe, CeO2, SiO2, ZrO2, TiO2, MgO, ZnO, Al2O3 [10,[33][34][35][36][37][38][39]) have been applied to change the interactions between support and metal particles which may thereby influence the catalytic properties. Particularly, alumina has been widely investigated as a catalyst support due to high activity and low cost in the reforming process [33][34][35]40].…”

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

Fuel

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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: 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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“…For a better Ni dispersion, various nano-porous supports such as MCM-41 [23,24], zeolite [25], and SBA-15 [26,27] have been utilized to confine the size of Ni nano-particles inside the pores of the catalyst support. This type of confined reaction space with uniform Ni particles could enhance the production of H 2 -enriched syngas.…”

Section: Introductionmentioning

confidence: 99%

Characteristics and catalytic properties of Ni/CaAlO x catalyst for hydrogen-enriched syngas production from pyrolysis-steam reforming of biomass sawdust

Chen

Dong

et al. 2016

Applied Catalysis B: Environmental

137

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Abstract:The production of hydrogen-enriched syngas from the thermo-chemical conversion of biomass was studied using Ni/CaAlO x catalysts prepared by coprecipitation method. The effect of Ca addition with different molar ratios of Ca:Al (1:3, 1:2, 1:1, 2:1, 3:1) on the properties and catalytic behaviour in relation to syngas production and the coke formation on the surface of the catalysts were investigated.Catalysts were characterized by BET, XRD, TPR, SEM, and TEM. The SEM and TEM results showed that rod-shaped nano-particles were highly dispersed on the surface of the catalyst. The particle size of NiO was slightly affected with the increase of Ca content in the catalyst. It appeared that the selectivity of CO was increased and the selectivity of CO 2 was reduced with the increase of Ca addition to the catalyst. For example, CO 2 concentration was reduced from 20 to 12 Vol.%, when the molar ratio of Ca/Al was increased from 1:3 to 3:1 for the Ni/CaAlO x catalyst; it is suggested that the water gas shift reaction was inhibited and CO 2 reforming reactions were promoted in the presence of the catalyst with higher Ca content. The CO/H 2 molar ratio could be manipulated by changing the Ca content in the catalyst, while the H 2 concentration remained almost constant (around 45 Vol.%). Thus, using the Ni/CaAlO x catalyst developed in this work could provide a promising route to control the syngas composition, which is an important factor for syngas applications.

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“…The reagents used were Ni(NO 3 [11], while the molar of the active metals to the mixed lanthanum-alkali earth metals was 1:1 and the molar ratio of the mixed lanthanum-alkali earth metals to that of citric acid monohydrate added was 1:2. The solution obtained was continuously stirred at 55 • C until a gel-like structure was formed.…”

Section: Catalyst Synthesismentioning

confidence: 99%

“…The biomass can be converted to syngas which can be used for generating electricity and for chemical synthesis via Fischer-Tropsch to produce methanol, dimethylether, and other chemical products [1][2][3][4]. However, the main problem of biomass is formation of tar (complex mixture of aromatic heavy hydrocarbons with toluene as the major component, followed by naphthalene) which can cause a wide range of problems in downstream process units since the condensation and deposition of tar result in plugging and fouling of turbines, pipelines and engines.…”

Section: Introductionmentioning

confidence: 99%

Perovskite LaxM1−xNi0.8Fe0.2O3 catalyst for steam reforming of toluene: Crucial role of alkaline earth metal at low steam condition

Oemar

Ang

Hee

et al. 2014

Applied Catalysis B: Environmental

139

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Biomass Gasification: Catalytic Removal of Tars over Zeolites and Nickel Supported Zeolites

Cited by 110 publications

References 37 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

Characteristics and catalytic properties of Ni/CaAlO x catalyst for hydrogen-enriched syngas production from pyrolysis-steam reforming of biomass sawdust

Perovskite LaxM1−xNi0.8Fe0.2O3 catalyst for steam reforming of toluene: Crucial role of alkaline earth metal at low steam condition

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