Suppression of carbon deposition in the CO2-reforming of CH4 by adding basic metal oxides to a Ni/Al2O3 catalyst

Horiuchi, Tatsuro; Sakuma, Kaori; Fukui, Takehisa; Kubo, Yukio; Osaki, Toshihiko; Mori, Toshiaki

doi:10.1016/0926-860x(96)00100-7

Cited by 328 publications

(144 citation statements)

References 16 publications

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“…The excellent activity promotion by K-addition was reported previously 7) , whereas slight improvements in the activity of dry reforming 13) , steam reforming of apple pomace by decomposition 14) , and steam reforming of ethylene by carbon removal 15) were reported. Contrary to our findings, K-addition to the reforming catalyst is often reported to suppress the reforming activity with reduced carbon formation 16) . The dissociation of the C _ H bond was retarded by K-addition based on the density functional theory (DFT) calculation and surface science experiments 17) .…”

Section: Dfcontrasting

confidence: 56%

“…Only a few Ni catalysts act as a direct route catalyst such as Ni/ , Yuichiro YAMAZAKI 1) , Daisuke ITABASHI 1) , Takayuki NAKANISHI 1) , and Muneyoshi YAMADA 2) 1) Dept. of Applied Chemistry, Graduate School of Engineering, Tohoku University, Aoba 6-6-07, Aoba-ku, Sendai 980-8579, JAPAN 2) Akita National College of Technology, Bunkyo-cho 1-1, Iijima, Akita 011-8511, JAPAN (Received October 16,2009) To suppress total oxidation and increase the CO selectivity of high-pressure oxidative reforming of methane, preparation parameters of K _ Ni/α-Al2O3 catalyst were optimized. The target preparation parameters were the main factors affecting CO selectivity such as calcination temperature of γ-Al2O3, and NiO and K loadings.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Fractal Dimension on CO Selectivity of K−Ni/α-Al2O3 Catalyst for High Pressure Oxidative Reforming of Methane

光司

征志郎

純平

et al. 2010

J. Jpn. Petrol. Inst.

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Section: Dfcontrasting

confidence: 56%

Section: Introductionmentioning

confidence: 99%

Effect of Fractal Dimension on CO Selectivity of K−Ni/α-Al2O3 Catalyst for High Pressure Oxidative Reforming of Methane

光司

征志郎

純平

et al. 2010

J. Jpn. Petrol. Inst.

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“…Coke deposition is one of the most problematic factors causing catalyst deactivation during catalytic thermo-chemical conversion of biomass [52,53]. The characteristics of coke formation on the reacted Ni/CaAlO x catalysts were investigated using temperature programmed oxidation (TPO).…”

Section: Coke Formation Analysis Using Temperature Programmed Oxidationmentioning

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

143

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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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“…It is well known in the literature that small amounts of some salts can change the material properties with respect to their reactivity or catalytic activity by changes in their internal structure. They may be present as separate phases or combined with Al 2 O 3 as aluminate or spinel phases 26,27 . Basic metal oxides, such as K 2 O and La 2 O 3 are often incorporated into steam reforming catalysts to provide operational advantages resulting from lower support acidity, higher nickel dispersion, and better steam activation.…”

Section: Oxygen Carriers Of Ni-cumentioning

confidence: 99%

Nickel−Copper Oxygen Carriers To Reach Zero CO and H₂ Emissions in Chemical-Looping Combustion

Adánez

Garcı́a-Labiano

Diego

et al. 2006

Ind. Eng. Chem. Res.

110

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Ni-based oxygen carriers allow to work at high temperatures (900-1100ºC) in a Chemical-Looping Combustion (CLC) process with full CH 4 conversion, although thermodynamic restrictions result in the presence of CO and H 2 in the gas outlet of the fuel reactor. On the other hand, Cu-based oxygen carriers allow complete fuel combustion to CO 2 and H 2 O, but the operating temperature is limited due to the low melting point of the metallic Cu. The objective of this research was to analyze the behavior of several Ni-Cu oxygen carriers to reduce or avoid CO and H 2 emissions during a CLC process working at high temperatures. Commercial Al 2 O 3 and  Al 2 O 3 were used as support to prepare by dry impregnation different oxygen carriers based on nickel and copper. The reactivity of these oxygen carriers was determined in a thermogravimetric analyzer (TGA). The effect of the mixture of NiO and CuO on the CO and H 2 generation was analyzed in a fixed bed reactor, and the gas product distribution during reduction/oxidation reactions was studied in a batch fluidized bed reactor working with CH 4 as fuel and diluted air for oxidation. The fluidization behavior of the oxygen carriers with respect to the attrition and agglomeration processes was also analyzed during the multi-cycle batch fluidized bed tests.The presence of CuO in the Ni-Cu oxygen carriers allows the full conversion of CH 4 to CO 2 and H 2 O in the batch fluidized bed reactor during the initial part of the reduction time, and this time depended on the CuO content of the oxygen carrier. TGA and X-ray diffraction studies indicated that CuO is used for the reduction reaction before NiO. In addition, it was observed that the presence of NiO stabilized the CuO and allowed to work at 950 ºC with Ni-Cu oxygen carriers with a high metal oxide utilization.

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Suppression of carbon deposition in the CO2-reforming of CH4 by adding basic metal oxides to a Ni/Al2O3 catalyst

Cited by 328 publications

References 16 publications

Effect of Fractal Dimension on CO Selectivity of K−Ni/<i>α</i>-Al<sub>2</sub>O<sub>3</sub> Catalyst for High Pressure Oxidative Reforming of Methane

Effect of Fractal Dimension on CO Selectivity of K−Ni/<i>α</i>-Al<sub>2</sub>O<sub>3</sub> Catalyst for High Pressure Oxidative Reforming of Methane

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

Nickel−Copper Oxygen Carriers To Reach Zero CO and H₂ Emissions in Chemical-Looping Combustion

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Suppression of carbon deposition in the CO2-reforming of CH4 by adding basic metal oxides to a Ni/Al2O3 catalyst

Cited by 328 publications

References 16 publications

Effect of Fractal Dimension on CO Selectivity of K−Ni/<i>α</i>-Al<sub>2</sub>O<sub>3</sub> Catalyst for High Pressure Oxidative Reforming of Methane

Effect of Fractal Dimension on CO Selectivity of K−Ni/<i>α</i>-Al<sub>2</sub>O<sub>3</sub> Catalyst for High Pressure Oxidative Reforming of Methane

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

Nickel−Copper Oxygen Carriers To Reach Zero CO and H2 Emissions in Chemical-Looping Combustion

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Nickel−Copper Oxygen Carriers To Reach Zero CO and H₂ Emissions in Chemical-Looping Combustion