Efficient hydrogen production using cyclohexane and decalin by pulse-spray mode reactor with Pt catalysts

Kariya, Nobuko; Fukuoka, Atsushi; Utagawa, Tadashi; Sakuramoto, Masashi; Goto, Yasushi; Ichikawa, Masaru

doi:10.1016/s0926-860x(03)00104-2

Cited by 198 publications

(120 citation statements)

References 15 publications

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“…1 -4 Decalins have also found numerous applications; recent ones include their use in the production of nanomaterials 5 and in hydrogen storage in fuel cells. 6,7 The decalins also play an important negative role as pollutants and environmental contaminants. 8 Therefore, spectral characterization of these molecules is of interest and significance (for instance, NMR spectra of substituted trans-and cisdecalins were recently used to prove the structure of a natural compound).…”

Section: Introductionmentioning

confidence: 99%

1H and13C NMR chemical shifts and spin-spin coupling constants intrans- andcis-decalins

2005

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The NMR parameters characterizing the spectra of trans- and cis-decalins were determined from theoretical calculations and experimental spectra. The calculated values of the shielding constants are in good agreement with the measured chemical shifts, with a small but noticeable difference in accuracy for the bridgehead atoms. Of all the spin-spin coupling constants, only most of (1)J(C,C) and (1)J(C,H) values could be extracted from the spectra, and the corresponding computed values are in good agreement with experiment. It appears that the applied density functional theory (DFT) approach overestimates slightly the J(C,C) coupling and underestimates the differences between one-bond (1)J(C,H) coupling constants. For all these constants [J(C,C), J(C,H) and J(H,H)] through one to three bonds, which could not be obtained experimentally, the predicted values are in good agreement with the general rules relating spin-spin coupling to the number and spatial arrangement of the intervening bonds.

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Section: Introductionmentioning

confidence: 99%

1H and13C NMR chemical shifts and spin-spin coupling constants intrans- andcis-decalins

2005

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“…The catalyst activity and type of reactions possibly varied with variation in feed conditions with respect to pulse injection frequency and injection width. Similar to the dehydrogenation reaction of cyclohexane and decalin on Pt supported catalysts [15,16], it may be possible to deduce the optimizing the spray pulsed feed conditions for high rate of hydrogen production in the iso-octane reforming reaction. As in the case of present study the feed rate of 1.66 m molmin )1 (0.552 m mol pulse, 20 s intervals) and the reaction temperature of 700°C are the optimum conditions for reforming of iso-octane over Ni-Mn to produce hydrogen.…”

Section: Discussionmentioning

confidence: 99%

“…Feeding of atomized liquid reactant in pulses and alternatively creating wet and dry conditions on heated solid catalyst surface improves the yield of the reaction. Use of the unsteady state pulse spray has been demonstrated for improving the rate of reaction by a magnitude higher than the rate for conventional flow reaction conditions [15,16]. A spray pulse reactor has been used in this study for atomization of iso-octane and for improving the contact between reactant and the catalyst.…”

Section: Introductionmentioning

confidence: 99%

Production of hydrogen-rich gas via reforming of iso-octane over Ni?Mn and Rh?Ce bimetallic catalysts using spray pulsed reactor

Biniwale

Ichikawa

2005

Catal Lett

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The conversion of hydrocarbon fuels such as gasoline and diesel is a potential source for hydrogen production towards various fuel cell systems. A novel spray pulsed mode reactor to create alternate wet and dry conditions on the catalyst surface has been used in this study to enhance the rates of hydrogen production compared with the solid-gas phase reaction due to the improvement of the catalyst reactant contact. The production of hydrogen-rich gas by reforming of iso-octane (2,2,4-trimethylepentane) in the presence of steam and air has been studied at 600 and 700°C over Ni-Mn and Rh-Ce bimetallic catalysts supported on alumina mesh. The feed rate of iso-octane was varied from 0.553 to 5.53 m mol min )1 by controlling pulse injection in terms of the width and frequency of injection of iso-octane. Based on the product analysis optimized condition for higher hydrogen production and high H 2 /CO ratio has been deduced.

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“…As the dehydrogenation of cycloalkanes is endothermic and chemical equilibrium is favorable for dehydrogenation at higher temperature, the reactions were performed at high temperature using steady state operation under gas phase or under liquid-film state [18,19]. We have reported earlier, in case of dehydrogenation of cyclohexane [20,21] and reforming of iso-octane [22] that by feeding of atomized liquid reactant in pulses and alternatively creating wet and dry conditions on heated solid catalyst surface improves the yield of reaction. The alternate wet-dry conditions created on catalyst surface helps easy evaporation of liquid reactant on the catalyst surface.…”

Section: Introductionmentioning

confidence: 99%

In-situ infrared thermographic analysis during dehydrogenationof cyclohexane over carbon-supported Pt catalysts using spray-pulsed reactor

2005

Self Cite

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Infrared thermography, a tool used for screening of active catalytic materials generally during the exothermic reactions has been used for thermal imaging during strong endothermic reaction of dehydrogenation of cyclohexane on Pt catalyst supported on active carbon cloth (CFF-1500s) sheets. A spray-pulsed mode was used for injection of atomized cyclohexane and to create alternate wet and dry condition on catalyst surface. The simultaneous product gas analysis and recording of the temperature profile of the catalyst surface using an IR camera was carried out. The production rate of hydrogen via endothermic dehydrogenation reaction is greatly dependent on the temperature of the catalyst surface. The observed change in the temperature profile at wet and dry conditions with varying pulse-injection frequency and corresponding product gas analysis reveals that the spray-pulse mode is useful in improving the catalyst activity. Further the reaction conditions were optimized using thermal profile data.

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Efficient hydrogen production using cyclohexane and decalin by pulse-spray mode reactor with Pt catalysts

Cited by 198 publications

References 15 publications

1H and13C NMR chemical shifts and spin-spin coupling constants intrans- andcis-decalins

1H and13C NMR chemical shifts and spin-spin coupling constants intrans- andcis-decalins

Production of hydrogen-rich gas via reforming of iso-octane over Ni?Mn and Rh?Ce bimetallic catalysts using spray pulsed reactor

In-situ infrared thermographic analysis during dehydrogenationof cyclohexane over carbon-supported Pt catalysts using spray-pulsed reactor

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