Promoting effect of Pt addition to Ni/CeO2/Al2O3 catalyst for steam gasification of biomass

Nishikawa, Jin; Miyazawa, Tomohisa; Nakamura, Kazuya; Asadullah, Mohammad; Kunimori, Kimio; Tomishige, Keiichi

doi:10.1016/j.catcom.2007.05.045

Cited by 93 publications

(38 citation statements)

References 35 publications

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“…This indicates that the intermetallic compounds are not formed, but Pt-Ni alloy phase is formed. This behavior is supported by previous reports [9,[31][32][33]. The coordination number of the Pt-Ni bond was much larger than that of the Pt-Pt bond on Pt(C, 0.4)+Ni(N, 10.6).…”

Section: Catalyst Characterizationsupporting

confidence: 79%

Oxidative steam reforming of methane over Ni/α-Al2O3 modified with trace Pd

Yoshida

Okumura

Miyao

et al. 2008

Applied Catalysis A: General

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Ni catalysts supported on α-Al 2 O 3 modified with small amounts of Pd were prepared by different impregnation methods to investigate catalytic performance and catalyst bed temperature profile in oxidative steam reforming of methane. The Pd+Ni bimetallic catalysts prepared by the co-impregnation method showed higher resistance to hot-spot formation than monometallic Ni and bimetallic Pd/Ni catalysts prepared by two sequential impregnations, in particular, Pt+Ni catalysts prepared by the co-impregnation method. The additive effect of Pd on the Pd/Ni catalysts was discussed on the bases of metal particle size and structural analysis by Pd K-edge extended X-ray absorption fine structure. Graphical AbstractThe Pd+Ni bimetallic catalysts supported on α-Al 2 O 3 prepared by a co-impregnation method are much more effective for the suppression of hot-spot formation in oxidative steam reforming of methane than the corresponding monometallic catalysts, which is caused by synergy between Pd with high reducibility and Ni with high reforming activity.

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Section: Catalyst Characterizationsupporting

confidence: 79%

Oxidative steam reforming of methane over Ni/α-Al2O3 modified with trace Pd

Yoshida

Okumura

Miyao

et al. 2008

Applied Catalysis A: General

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“…[21][22][23] A number of catalysts have been proven to be active for hydrogen production and are stable towards deactivation in biomass gasification/reforming, which are mainly the platinum group metals (e.g. Ph, Rt, Pd, Ru) based catalysts [23][24][25][26][27]. However, the high cost of noble metal-based catalysts discourages the practical application of biomass gasification/ pyrolysis-reforming.…”

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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“…Corujo et al 52 reported a more than 5 wt.% amount of coke formation on a Ni/dolomite catalyst for steam gasification of forestry residue. In addition a higher amount (>10wt.%) of coke formation was reported for gasification of biomass using a Ni/Al2O3 catalyst 53 .…”

Section: Gas Concentrationmentioning

confidence: 99%

“…Among them, Al2O3 is regarded as an effective support, in particular, in relation to the catalytic activity for hydrogen production and thermal stability 17,18 . The introduction of CeO2 to Ni-catalysts has been reported to enhance the catalytic performance, and the formation of the Ni-CeO2 nanocomposite was responsible for the better catalytic performance in terms of the prohibition of catalyst sintering and coke formation on the surface of the reacted catalysts 12,[18][19][20] 28 .…”

Section: Introductionmentioning

confidence: 99%

Development of Fe-Promoted Ni–Al Catalysts for Hydrogen Production from Gasification of Wood Sawdust

Dong

Ling

et al. 2016

Energy Fuels

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ABSTRACT:The production of renewable hydrogen enriched gas from biomass waste is a promising technology for the development of a sustainable economy and society. Until now, there are still challenges of the technology in terms of the efficiency of hydrogen production. Catalyst is known and has been tested to enhance hydrogen production from biomass gasification. In particular using Ni-based catalysts, which have high reactivity for hydrogen production and are cost effective. However, developing a Ni-based catalyst with high thermal stability and resistance of coke deposition on the surface of the catalyst is still a challenging topic. In this work, Ni-Al catalysts doped with low-cost Fe metal were investigated for hydrogen enriched syngas production from gasification of biomass using a two-stage fixed bed reactor. NiOFe2O3-Al2O3 catalysts with various Ni:Fe molar ratios (9:1, 8:2, 6:4, 5:5, 4:6, 2:8 and 1:9) were studied aiming to understand the influence of Fe addition on the production of hydrogen and the catalyst stability in terms of coke deposition on surface. X-ray diffraction, temperature programme reduction and Transmission electron microscopy analysis of the fresh catalysts showed that nanoparticles (mainly NiAl2O4 spinel phase and Al2O3, ~5 nm) were identified in the catalysts. High dispersion of metal particles was obtained using a co-precipitation method of catalyst preparation. With the increase of Fe addition, hydrogen production was reduced from around 11 to 8 (mmol H2 g -1 biomass). However, the addition of Fe into the Ni-based catalyst significantly reduced the amount of coke deposited on the surface of the catalyst.H2/CO molar ratio was maximized to 1.28 when Ni:Fe molar ratio was 1:1. In addition, sintering of metal particles was not observed through the TEM analysis of the fresh and reacted catalysts.2

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Promoting effect of Pt addition to Ni/CeO2/Al2O3 catalyst for steam gasification of biomass

Cited by 93 publications

References 35 publications

Oxidative steam reforming of methane over Ni/α-Al2O3 modified with trace Pd

Oxidative steam reforming of methane over Ni/α-Al2O3 modified with trace Pd

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

Development of Fe-Promoted Ni–Al Catalysts for Hydrogen Production from Gasification of Wood Sawdust

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