Promoting effects of doping ZnO into coprecipitated Ni-Al2O3 catalyst on methane decomposition to hydrogen and carbon nanofibers

Chen, Jiuling; Qiao, Yuanhua; Li, Yongdan

doi:10.1016/j.apcata.2007.12.007

Cited by 58 publications

(30 citation statements)

References 27 publications

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“…Smaller metal particle size and more catalytic active sites have been reported to enhance gas production from reforming reactions [3,59,65]. For example, in our previous work, for pyrolysis-catalytic steam reforming of biomass with Ni/MCM-41 catalyst [7], the production of hydrogen and gas was significantly increased with the increase of Ni loading from 5 to 20 wt.% while NiO crystal size was stable (around 2.9 nm).…”

Section: Product Yieldmentioning

confidence: 97%

“…and 10NiZnAl catalysts, a broad hydrogen consumption band was obtained between 650 and 1050 °C with a maximum consumption at around 1000 °C, and these can be assigned to the reductions of ZnAl2O4 and NiAl2O4 spinel phases [59][60][61]. High temperature was required to reduce the fresh catalyst; it is suggested that this was due to the strong interactions between metals and catalyst support [56].…”

Section: Tpr Analysis Of Fresh Niznal Catalystsmentioning

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: Product Yieldmentioning

confidence: 97%

Section: Tpr Analysis Of Fresh Niznal Catalystsmentioning

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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“…5a, the XPS patterns of Ni 2p 3/2 show that two peaks emerge at binding energies of 855.8 eV and 851.6 eV, which correspond to the characteristic peaks of Ni 2? and Ni 0 , respectively [24]. Over Ni-Ce/Al 2 O 3 , the Ni 2p 3/2 patterns vary in their position and intensity: All peaks shift to lower positions by 0.4-0.2 eV, respectively, and the peak at 851.4 eV in Fig.…”

Section: Characterizationsmentioning

confidence: 94%

Fe Promoted Ni–Ce/Al2O3 in Auto-Thermal Reforming of Ethanol for Hydrogen Production

et al. 2009

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Ni-Ce/Al 2 O 3 and Ni-Ce-Fe/Al 2 O 3 catalysts prepared by impregnation were tested in auto-thermal reforming (ATR) of ethanol. With ceria promotion, conversion of ethanol near 100% and selectivity to hydrogen at 103.6% can be achieved at 600°C in ATR of ethanol, while with both iron and ceria promotion, selectivity to hydrogen at 118.4% is observed, which are higher (57.17% improvement on hydrogen selectivity) than that of the conventional Ni catalyst. In addition, higher stability is also observed during a 31-h test. The improvements are attributed to the restrained acidity and high dispersion of nickel alumina spinel phase.

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“…Lu et al found that the catalyst of ZnO supported on -Al 2 O 3 has a higher activity than ZnO or ZnO supported on SiO 2 , -Zeolite, and MCM-41 [20]. Interestingly, it was observed that ZnO could cover the surface acidity of the alumina support and further enhance the reducibility of supported metal particles [21][22][23][24]. Not only for better metal dispersion and size control [25], the strong interaction between ZnO and metal particles could also prevent sintering and catalytic poisoning under operating conditions [26][27].…”

Section: Introductionmentioning

confidence: 99%

Catalytic steam reforming of volatiles released via pyrolysis of wood sawdust for hydrogen-rich gas production on Fe–Zn/Al2O3 nanocatalysts

Chen

Dong

et al. 2015

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Abstract:Thermo-chemical processing of biomass is a promising alternative to produce renewable hydrogen as a clean fuel or renewable syngas for a sustainable chemical industry. However, the fast deactivation of catalysts due to coke formation and sintering limits the application of catalytic thermo-chemical processing in the emerging bio-refining industry. In this research, Fe-Zn/Al 2 O 3 nanocatalysts have been prepared for the production of hydrogen through pyrolysis catalytic reforming of wood sawdust. Through characterization, it was found that Fe and Zn were well distributed on the surface with a narrow particle size. During the reactions, the yield of hydrogen increased with the increase of Zn content, as Zn is an efficient metal promoter for enhancing the performance of the Fe active site in the reaction. The 20% Fe/Al 2 O 3 catalyst with Zn/Al ratio of 1:1 showed the best performance in the process in relation to the hydrogen production and resistance to coke formation on the surface of the reacted catalyst. All the catalysts showed ultra-high stability during the process and nearly no sintering were observed on the used catalysts. Therefore, the nanocatalysts prepared in this work from natural-abundant and low-cost metals have promising catalytic properties (high metal dispersion and stability) to produce H 2 -rich syngas with optimal H 2 /CO ratio from the thermo-chemical processing of biomass.

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Promoting effects of doping ZnO into coprecipitated Ni-Al2O3 catalyst on methane decomposition to hydrogen and carbon nanofibers

Cited by 58 publications

References 27 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

Fe Promoted Ni–Ce/Al2O3 in Auto-Thermal Reforming of Ethanol for Hydrogen Production

Catalytic steam reforming of volatiles released via pyrolysis of wood sawdust for hydrogen-rich gas production on Fe–Zn/Al2O3 nanocatalysts

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