Effect of CeO2-addition sequence on the performance of CeO2-modified Ni/Al2O3 catalyst in autothermal reforming of iso-octane

Choi, Sunghyun; Ahn, In Young; Moon, Sang Heup

doi:10.1007/s11814-009-0227-2

Cited by 8 publications

(5 citation statements)

References 26 publications

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“…Autothermal reforming (ATR) of CH 4 is a combination of steam reforming (SR) and partial oxidation (PO) of CH 4 [1][2][3][4][5][6][7][8]. SR is a highly endothermic reaction that requires an external heat source.…”

Section: Introductionmentioning

confidence: 99%

Effects of La2O3 on ZrO2 supported Ni catalysts for autothermal reforming of CH4

Chun¹,

Kim²

2010

Korean J. Chem. Eng.

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The effect of La 2 O 3 content in Ni-La-Zr catalyst was investigated for the autothermal reforming (ATR) of CH 4 . The catalysts were prepared by the coprecipitation method and had a mesoporous structure. Temperature programmed reduction (TPR) and X-ray photoelectron spectroscopy (XPS) indicated that a strong interaction developed between Ni species and the support with the addition of La 2 O 3 . Thermogravimetric analysis (TGA) and H 2 -pulse chemisorption showed that the addition of La 2 O 3 led to well dispersed NiO molecules on the support. Ni-La-Zr catalysts gave much higher CH 4 conversion than Ni-Zr catalyst. The Ni-La-Zr containing 3.2 wt% La 2 O 3 showed the highest activity. The optimum conditions for maximal CH 4 conversion and H 2 yield were H 2 O/CH 4 =1.00, O 2 /CH 4 =0.75. Under these conditions, CH 4 conversion of 83% was achieved at 700 o C. In excess O 2 (O 2 /CH 4 >0.88), the catalytic activity was decreased due to sintering of the catalyst.

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Section: Introductionmentioning

confidence: 99%

Effects of La2O3 on ZrO2 supported Ni catalysts for autothermal reforming of CH4

Chun¹,

Kim²

2010

Korean J. Chem. Eng.

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“…When Ni species are loaded onto the appropriate support, the positive metal/support synergistic effect will remarkably improve their catalytic performance and stability. For example, Choi et al demonstrated that the addition of CeO 2 to Al 2 O 3 prior to loading Ni species increased the dispersion of the Ni species on the support due to improved CeO 2 -Ni interaction, leading to increased hydrogen yield and longer lifetime of the catalyst during auto-thermal reforming of iso-octane [20]. Sánchez-Sánchez et al showed that the existence of Ni-Ce species Ni/CeO 2 -Al 2 O 3 could enhance adsorption and dissociation of water molecules, thus improving their catalytic activity for ethanol reforming [21].…”

Section: Introductionmentioning

confidence: 99%

Enhanced CH4 Production from Corn-Stalk Pyrolysis Using Ni-5CeO2/MCM-41 as a Catalyst

Huang

Hou

et al. 2019

Energies

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Production of syngas from lignocellulosic biomass though pyrolysis is a promising solution for the large-scale utilization of biomass. However, current pyrolysis approaches suffer from the relative low product yield and selectivity, limiting their practical application. To solve this problem, a series of nickel-based catalysts including Ni/MCM-41, Ni-5CeO2/MCM-41, and Ni-5La2O3/MCM-41 were prepared and characterized by transmission electron microscopy (TEM), N2 adsorption–desorption, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and H2-temperature-programmed reaction (TPR) analysis. It was observed that the simultaneous addition of Ni and CeO2 to MCM-41 could increase the reducibility of Ni and the number of active Ni0 sites on the surface of the catalyst. Consequently, Ni-5CeO2/MCM-41 gave a CH4 yield of 14.6 mmol/g, which is remarkably higher than that (10.5 mmol/g) obtained in the absence of the catalyst. Meanwhile, the CO and H2 yields increased slightly, while the CO2 yield decreased slightly. Therefore, the improved CH4 yield and selectivity was mainly due to the increased decomposition of tarry compounds catalyzed by Ni/MCM-41 with the assistance of CeO2.

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“…Ni/Al 2 O 3 presents a cheap catalytic system which is relatively stable and possesses favorable metal–support interactions . Hence a number of ways of improving the catalytic activity, stability, and applicability of nickel-based catalysts for low-temperature gasification have been investigated and reported in the literature. − The role of Ni/Al 2 O 3 catalysts in C–C and C–O bond cleavage during biomass and tar conversion is reported in the literature. , The acidic alumina support provides a high surface area, good thermal stability, high adsorption capacity, and excellent mechanical strength, for the active nickel species, with minimal agglomeration, sintering, or crystal growth especially when the nickel loading is not more than 20 wt %. − It was reported that the incorporation of an appropriate promoter could enhance the catalytic properties and give rise to a new set of kinetic parameters for the same reactive system. ,, Choi et al reported that ceria in Ni/CeO 2 /Al 2 O 3 catalyst assisted in improving the hydrogen yield, attenuating coke deposition during autothermal reforming of isooctane . Furthermore, the reactor type is very vital in ensuring that a reasonable biomass or tar conversion is achieved.…”

Section: Introductionmentioning

confidence: 99%

“…9−11 It was reported that the incorporation of an appropriate promoter could enhance the catalytic properties and give rise to a new set of kinetic parameters for the same reactive system. 2,11, 12 Choi et al reported that ceria in Ni/ CeO 2 /Al 2 O 3 catalyst assisted in improving the hydrogen yield, attenuating coke deposition during autothermal reforming of isooctane. 12 Furthermore, the reactor type is very vital in ensuring that a reasonable biomass or tar conversion is achieved.…”

Section: Introductionmentioning

confidence: 99%

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Kinetics of Steam Gasification of Glucose as a Biomass Surrogate over Ni/Ce–Mesoporous Al₂O₃ in a Fluidized Bed Reactor

Adamu

Hossain

2018

Ind. Eng. Chem. Res.

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This study reports the kinetics of steam gasification of glucose as a biomass surrogate over a new Ni(x)/Ce-doped Al 2 O 3 (x = 5, 10, 15, and 20 wt %) catalyst in a fluidized bed reactor. The presence of ceria plus successive nickel impregnation helped in conserving the catalyst's high surface area (i.e., 102 m 2 /g at 20 wt % nickel loading). Incorporation of ceria dopant suppressed coke formation during steam gasification of 15 wt % glucose in the fluidized bed reactor at 650 °C and 1 atm in the order Ni(20) < Ni(15) < Ni(10) < Ni(5)/Ce-doped Al 2 O 3 . The detailed kinetic model comprises reactant adsorption, surface reaction, and product desorption steps, involving the water gas shift reaction (WGS), steam reforming of methane (SRM), and reverse dry reforming of methane (RDRM). Ni(20)/Ce-doped Al 2 O 3 with the best performance in terms of syngas production, and the least tendency for coking, was used for the kinetic studies (for T = 550− 700 °C and t = 5−25 s). The results of the model simulation indicate that the rate of water gas shift was the highest (7.76 × 10 −2 mmol/g of cat.•s•bar 2 ) followed by steam reforming of methane (4.13 × 10 −2 mmol/g of cat.•s•bar 2 ) and then reverse dry reforming of methane (3.57 × 10 −2 mmol/g of cat.•s•bar 2 ). The high reaction rates signify the suitability of the new Ni(x)/Ce− mesoporous Al 2 O 3 catalytic system applied in this work. The modeling procedure could be applied conveniently for a different catalytic system in a similar reactor to obtain the necessary kinetic parameters.

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Effect of CeO2-addition sequence on the performance of CeO2-modified Ni/Al2O3 catalyst in autothermal reforming of iso-octane

Cited by 8 publications

References 26 publications

Effects of La2O3 on ZrO2 supported Ni catalysts for autothermal reforming of CH4

Effects of La2O3 on ZrO2 supported Ni catalysts for autothermal reforming of CH4

Enhanced CH4 Production from Corn-Stalk Pyrolysis Using Ni-5CeO2/MCM-41 as a Catalyst

Kinetics of Steam Gasification of Glucose as a Biomass Surrogate over Ni/Ce–Mesoporous Al₂O₃ in a Fluidized Bed Reactor

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Effect of CeO2-addition sequence on the performance of CeO2-modified Ni/Al2O3 catalyst in autothermal reforming of iso-octane

Cited by 8 publications

References 26 publications

Effects of La2O3 on ZrO2 supported Ni catalysts for autothermal reforming of CH4

Effects of La2O3 on ZrO2 supported Ni catalysts for autothermal reforming of CH4

Enhanced CH4 Production from Corn-Stalk Pyrolysis Using Ni-5CeO2/MCM-41 as a Catalyst

Kinetics of Steam Gasification of Glucose as a Biomass Surrogate over Ni/Ce–Mesoporous Al2O3 in a Fluidized Bed Reactor

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Kinetics of Steam Gasification of Glucose as a Biomass Surrogate over Ni/Ce–Mesoporous Al₂O₃ in a Fluidized Bed Reactor