Effects of Metal Oxide Support and Non-noble Metal Active Species on Catalytic Steam Reforming of Ethanol for Hydrogen Production

Saeki, Takanori; Ohkita, Hironobu; Kakuta, Noriyoshi; Mizushima, Takeshi

doi:10.1627/jpi.58.341

Cited by 4 publications

(12 citation statements)

References 27 publications

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“…2. Ni10 underwent the stepwise reduction of NiO to the metal at 510 K and 572 K, which were approximately 100 K lower than the reduction temperatures for unsupported NiO 29) , indicating a promoting effect of the CeO2 on Ni reduction. The broad peak with a maximum at approximately 1040 K is attributed to the reduction of bulk CeO2 28) .…”

Section: Reduction Property and Crystalline Structurementioning

confidence: 87%

“…The CeO2 support employed in this study was synthesized using a precipitation method in which a mixed solution of Ce(NO3)3 6H2O and urea (Kishida Chemical Co., Ltd.) was stirred at 363 K 29) . The obtained precipitate was filtered, washed with water, dried at 383 K for 12 h, and then calcined at 773 K for 5 h. The BET surface area of the resultant CeO2 powder was 110 m 2 g -1 .…”

Section: Catalyst Preparationmentioning

confidence: 99%

“…These reduction peaks are located at higher temperatures than those for Ni10. This may suggest that the Cu addition hindered the close contact of NiO with CeO2, which decreased the reduction temperature of NiO 29) . In addition, Ni5Cu5 provided a weak shoulder peak at 495 K. This peak was assigned to the reduction of NiO crystallites, because the XRD pattern in Fig.…”

Section: Reduction Property and Crystalline Structurementioning

confidence: 99%

“…At a reaction temperature of 873 K, Cu10 was deactivated by carbon deposition 29) , while the H2 and C1-gas yields for the Ni-containing catalysts increased. However, the bimetallic catalysts with a Ni/Cu ratio of ≥ 1 produced a larger amount of CH4 compared with Ni10; therefore, the inhibitory effect of combining Ni and Cu on CH4 formation is degraded at 873 K.…”

Section: C a T A L Y T I C P E R F O R M A N C E F O R S R E A N Dmentioning

confidence: 99%

“…We previously investigated the effect of the metal oxide support on SRE over Ni catalysts and revealed that the use of CeO2 as a support both promoted the reduction of Ni ions to form catalytically-active metal sites and inhibited carbon deposition during the reaction 29) . We also demonstrated that the addition of relatively inactive Cu to Ni/CeO2 and Co/CeO2, each at metal loadings of 5 wt%, resulted in enhancement of the H2 yield and resistance to carbon deposition at 673 K 30) .…”

Section: Introductionmentioning

confidence: 99%

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セリア担持ニッケル–銅触媒の還元挙動とエタノール水蒸気改質における触媒性能に及ぼす触媒組成の効果

Saeki

Tsuda

Ohkita

et al. 2016

J. Jpn. Petrol. Inst.

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We investigated the effects of the Ni : Cu ratio and metal loading of a CeO2-supported bimetallic Ni _ Cu catalyst on its reduction behavior and catalytic performance during steam reforming of ethanol for H2 production. Compared with monometallic Ni and Cu catalysts, both the NiO and CuO phases in the bimetallic catalysts were reduced at lower temperatures to form fine NiCu alloy crystallites. At a reaction temperature of 673 K, Ni/CeO2 exhibited a higher H2 yield than Cu/CeO2 but also produced a large quantity of CH4 and carbon deposits. The undesired byproducts were substantially inhibited by replacing a portion of the Ni with Cu. The highest H2 yield and an excellent carbon inhibition were achieved when the content of each metal was 5 wt%. Notably, a physical mixture of Ni/CeO2 and Cu/CeO2, each with the same metal contents, exhibited a lower H2 yield and heavy carbon deposition. This indicates that the higher reducibility and alloying in the bimetallic catalyst are key factors for synergistic improvements of the catalytic properties.

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Section: Reduction Property and Crystalline Structurementioning

confidence: 87%

Section: Catalyst Preparationmentioning

confidence: 99%

Section: Reduction Property and Crystalline Structurementioning

confidence: 99%

Section: C a T A L Y T I C P E R F O R M A N C E F O R S R E A N Dmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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セリア担持ニッケル–銅触媒の還元挙動とエタノール水蒸気改質における触媒性能に及ぼす触媒組成の効果

Saeki

Tsuda

Ohkita

et al. 2016

J. Jpn. Petrol. Inst.

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Synthesis, characterization and catalytic application of Ni catalysts supported on alumina–zirconia mixed oxides

et al. 2017

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Alumina and alumina-zirconia mixed oxides were compared as supports to prepare nickel catalysts. The oxides were prepared by the sol-gel method using aluminum tri-sec-butoxide and zirconium (IV) propoxide as precursors, and its physicochemical properties were determined by BET, TGA, DTA, XRD, SEM and TEM. The catalysts of nickel were obtained by the impregnation of the supports with nickel nitrate (10 wt%) and were heat-treated at 700 • C. The specific area of the supports and catalysts decreased with the increase in the zirconia content in agreement with the crystalline phase formed. TEM micrographs of nickel catalysts revealed particles in the size range of 10-30 nm. The Ni/Al 2 O 3 -ZrO 2 catalysts were tested in the steam reforming reaction of ethanol (SRE) at 500 • C, and the obtained results suggest that the differences in catalytic activities depended on the content of ZrO 2 . The selectivity towards H 2 was ∼56% for the named catalyst Ni-Al-0.25Zr.

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Rice Husk Ash-Derived Ca-Mg-Modified Silicate as Support for Ni-Co for Hydrogen Production by Sorption-Enhanced Steam Reforming of Bioethanol

Ranjekar

Yadav

2023

Ind. Eng. Chem. Res.

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A multipurpose catalyst made of nickel and cobalt supported on silicate-based material modified by Ca and Mg was developed and used in sorption-enhanced steam reforming of (bio)-ethanol (SESRE). In SESRE, steam reforming and CO2 conversion to carbonates occur together to yield clean hydrogen. The catalyst was designed using silica sourced from rice hull ash (RHA) by oxidation and, subsequently, Ni and Co were loaded by the wet-impregnation technique. Three catalysts, namely, Ni/Ca-Mg silicate, Co/Ca-Mg silicate, and Ni-Co/Ca-Mg silicate, were synthesized with different metal loadings (5–15% w/w), among which 10 %Ni-10% Co/Ca-Mg silicate was the most active and selective. Various characterization techniques were used to determine the physico-chemical properties of 10% NI-10% Co/Ca-Mg silicate. CO2-sorption capacity and adsorption breakthrough time were measured. An adsorption capacity of 7.4 mol CO2/kg sorbent and a breakthrough time of 58 min at T = 723 K were observed with hydrogen production at 88 mol %. The catalyst was evaluated and optimized using such parameters as temperature, S/C ratio, and space velocity. The catalyst was tested for its robustness and found to be stable for 10 cycles. 10% Ni-10% Co/Ca-Mg yielded the best hydrogen output under the optimized operating conditions.

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Effects of Metal Oxide Support and Non-noble Metal Active Species on Catalytic Steam Reforming of Ethanol for Hydrogen Production

Cited by 4 publications

References 27 publications

セリア担持ニッケル–銅触媒の還元挙動とエタノール水蒸気改質における触媒性能に及ぼす触媒組成の効果

セリア担持ニッケル–銅触媒の還元挙動とエタノール水蒸気改質における触媒性能に及ぼす触媒組成の効果

Synthesis, characterization and catalytic application of Ni catalysts supported on alumina–zirconia mixed oxides

Rice Husk Ash-Derived Ca-Mg-Modified Silicate as Support for Ni-Co for Hydrogen Production by Sorption-Enhanced Steam Reforming of Bioethanol

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