Hydrogen Production Using an Ethanol-Steam-Reforming Reactor with Cu/ZnO/Al2O3 and Ru/Al2O3 Catalysts

Shinoki, Toshio; Ota, Kenji; Sono, Yuichi; Okuhigashi, Yuki; Funaki, Jiro; Hirata, Katsuya

doi:10.1299/jpes.5.218

Cited by 7 publications

(8 citation statements)

References 8 publications

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“…(1)- (6) しかし，実用改質器設計の際に必要となる実機スケールの改質器については，あまり詳細に調べられていない．そこで，著者らは，これまでに，設計規範確立の為の基礎研究を実施してきた. (7), (8) すなわち，実用的大きさを有する改質器を用い，効率的改質の為の種々の最適反応条件を調べてきた．その結果，低反応温度でのエタノール改質には Cu/ZnO/Al 2 O 3 触媒が適することを，明らかにしている. (7) また，基礎的知見を得る為，触媒層内の温度分布はほぼ均一となる様に管理し，種々の条件，すなわち，いくつかの液空間速度LHSV と反応温度T R に関して，ガス・クロマトグラフによる各組成の濃度やエタノール転化率を明らかにしている.…”

Section: 緒緒緒緒言言言言unclassified

“…(7), (8) すなわち，実用的大きさを有する改質器を用い，効率的改質の為の種々の最適反応条件を調べてきた．その結果，低反応温度でのエタノール改質には Cu/ZnO/Al 2 O 3 触媒が適することを，明らかにしている. (7) また，基礎的知見を得る為，触媒層内の温度分布はほぼ均一となる様に管理し，種々の条件，すなわち，いくつかの液空間速度LHSV と反応温度T R に関して，ガス・クロマトグラフによる各組成の濃度やエタノール転化率を明らかにしている. (8) 本報では，前報 (7), (8) に引き続き，実用的大きさを有する改質器を用い，効率的改質の為の種々の最適反応条件…”

Section: 緒緒緒緒言言言言unclassified

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Effects of <i>LHSV</i> and Reaction Temperature upon Ethanol-Steam-Reforming Performance

Funaki

Hirata

2012

Trans.JSME, Ser.B

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Supposing the design of ethanol steam-reforming reactors, the authors conduct experiments for Cu/ZnO/Al 2 O 3 catalyst. Using a household-use-scale reactor with well-controlled temperature distributions, the authors compare experimental results with chemical-equilibrium theories. It has revealed by Shinoki et al. (2011) that Cu/ZnO/Al 2 O 3 catalyst shows rather high performance with high hydrogen concentration C H2 at low values of reaction temperature T R .So, in the present study, the authors reveal the influences of liquid-hourly space velocity LHSV upon concentrations such as C H2 , C CO2 , C CO and C CH4 and the influence of LHSV upon the ethanol conversion X C2H5OH , in a range of LHSV from 0.05 h -1 to 0.8 h -1 , at S/C = 3.0 and T R = 520 K. And, the authors reveal the influences of the thermal profile upon C H2 , C CO2 , C CO , C CH4 and X C2H5OH , for several LHSV's. To conclude, with well-controlled temperatures, the reformed gas can be close to the theory.

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Section: 緒緒緒緒言言言言unclassified

Effects of <i>LHSV</i> and Reaction Temperature upon Ethanol-Steam-Reforming Performance

Funaki

Hirata

2012

Trans.JSME, Ser.B

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“…Many researchers have suggested that catalysts containing copper promote dehydrogenation of ethanol to acetaldehyde, while the presence of nickel favors the breaking of carbon-to-carbon bond formation of methane, carbon monoxide and hydrogen. Shinoki et. al.…”

Section: Introductionmentioning

confidence: 99%

Catalysts evaluation CuO/n-type semiconductor oxide/Al2O3 in ethanol steam reforming reaction for obtaining hydrogen to fuel cell

Zortea¹,

Friedrich²,

Almeida³

et al. 2016

Blucher Chemistry Proceedings

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The electric power generation, and hydrogen as a vector, in fuel cells, is a process of high energy efficiency and low environmental impact. However, hydrogen production has its still high cost, because the H 2 gas is not available in nature. Therefore, we study the steam reforming reaction of ethanol for the production of H 2 , featuring an environmentally friendly process, with low CO 2 emissions in nature as well as being economically viable in Brazil, a major world producer of ethanol. Assuming the reform of ethanol follows similar mechanism to the methanol reforming, whose catalyst for industrial use is composed of Cu/ZnO/Al 2 O 3 , it can be considered that copper catalysts on n-type semiconductor oxide should be effective in reforming reaction ethanol. Thus, replacement of zinc oxide of niobium pentoxide, both characteristics semicondução n-type catalysts may generate similarly. In this work study the performance of the catalysts Cu/ZnO/Al 2 O 3 (commercial catalyst HiFUEL Alfa Aesar) and Cu/Nb 2 O 5 /Al 2 O 3 in the ethanol steam reforming reaction. The catalysts were characterized by adsorption/desorption of N 2 and NH 3 -TPD analysis. The catalytic tests were carried out using a mixture of water:ethanol in a molar ratio equal to 10:1, reactant liquid flow rate of 1 ml/min to 573K. The gaseous product was analyzed on-line by gas chromatography. Results of the textural analysis show that the synthesized catalyst has a specific surface area about three times greater than the commercial catalyst, which has micropores on its surface. For NH 3 -TPD analysis it showed that the strongest acid sites are the commercial catalyst than in the synthesized catalysts. This may occur due to the provision of

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“…1 Experimental apparatus. (1) Pump for water, (2) pump for fuel, (3) mixer, (4) vaporisation unit, (5) inner pipe, (6) outer pipe, (7) catalyst, (8) electric heater, (9) gas burner, (10) thermal diffuser, (11) sheathed thermocouple,…”

mentioning

confidence: 99%

“…緒言現在，化石燃料の大量消費に対する環境保全策,すなわち，窒素酸化物(NO x )や硫黄酸化物(SO x )などによる大気汚染防止や地球温暖化に対する二酸化炭素(CO 2 )排出削減は，各界で積極的に取り組まれている．この背景のもと，環境に優しいエネルギー変換装置の一つとして，燃料電池が注目を集めている．燃料電池反応に必要な水素(H 2 )については，化石燃料起源の炭化水素(C n H m )を燃料として，触媒を用いて水蒸気改質反応させ生成する方法が，一般的である (1),(2) …”

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Hydrogen Production by a Steam-Reformer for Heavy Hydrocarbons

Hirata¹,

Nakamori²,

Tanigawa³

et al. 2013

Trans.JSME, Ser.B

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The authors develop a small and simple steam-reforming reactor in a home-use size for n-dodecane as a heavy-hydrocarbons fuel. Under such a well-controlled condition by a thermal diffuser as the reactor satisfies two target-temperature criteria, the authors measure the inside-temperature profile and the hydrogen molar fraction (concentration) C H2 , together with the molar fractions C CH4 , C CO and C CO2 of other main gas components such as CH 4 , CO and CO 2 , respectively, using a gas chromatograph. In addition, the authors conduct theoretical calculations based on the thermal-equilibrium theory, and reveal C H2 , C CH4 , C CO and C CO2 , as well as experiments. As a result, the authors successfully achieve suitable inside-temperature profiles. The steam-reforming reaction becomes more active at the position where temperature T > 800 K. The effects of the steam-to-carbon molar ratio S/C upon C H2 , C CH4 , C CO and C CO2 are shown, experimentally and theoretically. The experimental results agree well with the theoretical ones. Besides, carbon balance and conversion ratio show high accuracy in experiments.

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Hydrogen Production Using an Ethanol-Steam-Reforming Reactor with Cu/ZnO/Al2O3 and Ru/Al2O3 Catalysts

Cited by 7 publications

References 8 publications

Effects of <i>LHSV</i> and Reaction Temperature upon Ethanol-Steam-Reforming Performance

Effects of <i>LHSV</i> and Reaction Temperature upon Ethanol-Steam-Reforming Performance

Catalysts evaluation CuO/n-type semiconductor oxide/Al2O3 in ethanol steam reforming reaction for obtaining hydrogen to fuel cell

Hydrogen Production by a Steam-Reformer for Heavy Hydrocarbons

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