The Experts below are selected from a list of 216 Experts worldwide ranked by ideXlab platform
Yoshio Nosaka - One of the best experts on this subject based on the ideXlab platform.
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Design and evaluation of photocatalytic Micro-Channel Reactors using TiO2-coated porous ceramics
Journal of Photochemistry and Photobiology A: Chemistry, 2006Co-Authors: Sittidej Teekateerawej, Junichi Nishino, Yoshio NosakaAbstract:Abstract Photocatalytic Micro-Channel Reactor was designed by exploiting porous ceramic disks as a support for TiO2 photocatalyst. Ethanol solution of titanyl(IV)acetylacetonate and a commercial titania sol were used as the starting materials for the synthesis of TiO2 layer. A rougher surface of the TiO2 channel was prepared from titanyl(IV)acetylacetonate solution by comparing with that from a titania sol. Photocatalytic activity of the Micro-Channel Reactor at various circulation velocities was evaluated by measuring the decay of absrobance of methylene blue aqueous solution. Since the porous disks prepared with the titania sol showed a higher photocatalytic activity at medium flow rates, the surface roughness of the TiO2 was found to decrease the activity. A stagnation region near the rough surface may expand at higher flow rates and then the mass transfer between the TiO2 surface and the laminar flow was suppressed for the reactant molecules and decomposition intermediates.
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TiO2 Photocatalytic Micro-Channel Reactors Using Capillary Plates
Advanced Materials Research, 2006Co-Authors: Sittidej Teekateerawej, Junichi Nishino, Yoshio NosakaAbstract:Inner surface of capillary plates (CP) was coated with TiO2 to fabricate a Micro-Channel Reactor with 6-μm diameter. Titania sol was used to coat the surface of channel wall of CP and then it was calcined at 400°C for 4 h. The photocatalytic Micro-Channel Reactors were evaluated by measuring the decomposition rate of methyleneblue (MB) in aqueous solution circulating at the rate ranging from 1.2 to 5.8 cm3 min-1. The TiO2-coated CP showed a larger efficiency in decomposing MB solution, comparing with the previously reported Reactor using porous ceramics. The reaction rate increased with the flow rate, while it decreased at higher flow rates for the previous Reactor.
Sittidej Teekateerawej - One of the best experts on this subject based on the ideXlab platform.
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Design and evaluation of photocatalytic Micro-Channel Reactors using TiO2-coated porous ceramics
Journal of Photochemistry and Photobiology A: Chemistry, 2006Co-Authors: Sittidej Teekateerawej, Junichi Nishino, Yoshio NosakaAbstract:Abstract Photocatalytic Micro-Channel Reactor was designed by exploiting porous ceramic disks as a support for TiO2 photocatalyst. Ethanol solution of titanyl(IV)acetylacetonate and a commercial titania sol were used as the starting materials for the synthesis of TiO2 layer. A rougher surface of the TiO2 channel was prepared from titanyl(IV)acetylacetonate solution by comparing with that from a titania sol. Photocatalytic activity of the Micro-Channel Reactor at various circulation velocities was evaluated by measuring the decay of absrobance of methylene blue aqueous solution. Since the porous disks prepared with the titania sol showed a higher photocatalytic activity at medium flow rates, the surface roughness of the TiO2 was found to decrease the activity. A stagnation region near the rough surface may expand at higher flow rates and then the mass transfer between the TiO2 surface and the laminar flow was suppressed for the reactant molecules and decomposition intermediates.
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TiO2 Photocatalytic Micro-Channel Reactors Using Capillary Plates
Advanced Materials Research, 2006Co-Authors: Sittidej Teekateerawej, Junichi Nishino, Yoshio NosakaAbstract:Inner surface of capillary plates (CP) was coated with TiO2 to fabricate a Micro-Channel Reactor with 6-μm diameter. Titania sol was used to coat the surface of channel wall of CP and then it was calcined at 400°C for 4 h. The photocatalytic Micro-Channel Reactors were evaluated by measuring the decomposition rate of methyleneblue (MB) in aqueous solution circulating at the rate ranging from 1.2 to 5.8 cm3 min-1. The TiO2-coated CP showed a larger efficiency in decomposing MB solution, comparing with the previously reported Reactor using porous ceramics. The reaction rate increased with the flow rate, while it decreased at higher flow rates for the previous Reactor.
Yi Cheng - One of the best experts on this subject based on the ideXlab platform.
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Catalytic performance of Ni catalyst for steam methane reforming in a Micro-Channel Reactor at high pressure
Chemical Engineering and Processing: Process Intensification, 2017Co-Authors: Nian Zhang, Bozhao Chu, Yong Jin, Xin Chen, Chenxi Cao, Yi ChengAbstract:Abstract Hydrogen has drawn much attention as both a kind of clean and efficient energy and an important chemical material. Among numerous production method, steaming methane reforming (SMR) accounts for most of the hydrogen production over the world. In this work, we investigated the behavior of Ni catalyst and performance of Micro-Channel Reactor at high pressure for SMR process. The influences of various temperature, steam-to-methane ratio, GHSV at high pressure varied from 0.5 MPa to 2.0 MPa were studied in details. Even when the process was conducted at 240,000 h−1, the methane conversion could still approach to the thermodynamics limitation at 900 °C and 2.0 MPa, which confirmed that Micro-Channel Reactor with coated catalyst is not only feasible but high efficient for SMR process. Besides, we realized the hydrogen productivity of about 0.1 m3/h in a single channel at 2.0 MPa, namely 1.95 × 104 m3/(m3 h) space time productivity.
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Oxidative dehydrogenation of ethane to ethylene over phase-pure M1 MoVNbTeOx catalysts in a Micro-Channel Reactor
Catalysis Science & Technology, 2015Co-Authors: Bozhao Chu, L.a. Truter, T.a. Nijhuis, Yi ChengAbstract:Due to its excellent heat transfer ability, the Micro-Channel Reactor with coated phase-pure M1 catalysts can achieve Reactor productivity nearly 5 times higher than that of a traditional fixed-bed Reactor under the same reaction conditions in oxidative dehydrogenation of ethane (ODHE).
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total methanation of syngas to synthetic natural gas over ni catalyst in a micro channel Reactor
Fuel, 2012Co-Authors: Zhihong Liu, Bozhao Chu, Xuli Zhai, Yong Jin, Yi ChengAbstract:Abstract Methanation reaction from syngas to synthetic natural gas (SNG) has been successfully implemented over Ni catalyst in a Micro-Channel Reactor with high conversion and selectivity in milliseconds contact time. A new method called improved thermal spray to manufacture the metal-ceramics complex substrate as catalyst support was presented. The substrate demonstrated dual functions, i.e., the superior heat conduction as metal and stable catalyst coating on it as ceramics (e.g., Al2O3). The experiments verified that the fall-off proportion of the catalyst can be neglected after the plates experienced methanation reaction and strong vibration in ultrasonic cleaner. Meanwhile, the catalyst coatings on the walls of Micro-Channel Reactor showed high activity and stability, having the excellent catalytic performance for methanation reaction in Micro-Channel Reactors and the reliability in long-term use as well. At the temperature of 550 °C and the pressure of 30 atm, CO conversion and CH4 selectivity can remain above 98% and 92%, respectively, at a high GHSV of 71,000 h−1, where the corresponding residence time is only about 50 ms. Extensive characterizations of these Ni catalyst plates were also made to get a better understanding of the catalytic performance. The results of XRD, SEM, TEM and TPR characterizations demonstrated that Ni catalysts prepared in this work did not show any sign of deactivation after being used in the Micro-Channel system. It is expected that the methanation Reactor technique based on the metal-ceramics complex substrate as the catalyst support in (micro-)channel Reactors would open opportunities for the reliable engineering applications of either distributed or mass production of SNG from syngas.
Hiroshi Yamada - One of the best experts on this subject based on the ideXlab platform.
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Evaluation of catalyst prepared in microchannel with in situ FT-IR microscopy
Chemical Engineering Journal, 2010Co-Authors: Tomohiko Tagawa, M. Isobe, M. Tanaka, Hiroshi YamadaAbstract:Abstract In situ characterization of silicon micro channel Reactor with supported platinum alumina catalyst prepared on the channel wall was conducted with FT-IR microscope under propane flow, propene flow and cyclohexane flow. Surface π-allylic species along with surface OH group were observed at 373 K under propane or propene flow. These species were rather stable under N2 flow and H2 flow. The Reactor was active for dehydrogenation of cyclohexane to produce benzene and cyclohexene. In situ FT-IR observation under flow of cyclohexane at 473 K, decrease of reactant, increase of products, a maximum of π-allylic and C C species were observed from inlet toward outlet. The maximum absorbance of the intermediate shifted with flow rate. These suggested consecutive reaction path and existence of film resistance.
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Micro-Channel Reactor with guideline structure for organic–aqueous binary system
Chemical Engineering Science, 2007Co-Authors: Tomohiko Tagawa, Salah Aljbour, Mohammed Matouq, Hiroshi YamadaAbstract:Abstract A Micro-Channel with a guideline structure, with two inlets and two outlets was tested as a Reactor for performing organic–aqueous two-phase reactions. Partition walls so-called guideline structure were designed at the middle of a Micro-Channel with adequate intervals in order to stabilize and to maintain a laminar two-phase flow. Toluene and water were selected as the test fluids. Flow conditions for a complete two-phase laminar flow were determined and a good phase separation was ensured. The hydrolysis reaction of benzoyl chloride dissolved in the organic phase with water in the aqueous phase was conducted. The results were compared with those of a batch Reactor.
Junichi Nishino - One of the best experts on this subject based on the ideXlab platform.
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Design and evaluation of photocatalytic Micro-Channel Reactors using TiO2-coated porous ceramics
Journal of Photochemistry and Photobiology A: Chemistry, 2006Co-Authors: Sittidej Teekateerawej, Junichi Nishino, Yoshio NosakaAbstract:Abstract Photocatalytic Micro-Channel Reactor was designed by exploiting porous ceramic disks as a support for TiO2 photocatalyst. Ethanol solution of titanyl(IV)acetylacetonate and a commercial titania sol were used as the starting materials for the synthesis of TiO2 layer. A rougher surface of the TiO2 channel was prepared from titanyl(IV)acetylacetonate solution by comparing with that from a titania sol. Photocatalytic activity of the Micro-Channel Reactor at various circulation velocities was evaluated by measuring the decay of absrobance of methylene blue aqueous solution. Since the porous disks prepared with the titania sol showed a higher photocatalytic activity at medium flow rates, the surface roughness of the TiO2 was found to decrease the activity. A stagnation region near the rough surface may expand at higher flow rates and then the mass transfer between the TiO2 surface and the laminar flow was suppressed for the reactant molecules and decomposition intermediates.
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TiO2 Photocatalytic Micro-Channel Reactors Using Capillary Plates
Advanced Materials Research, 2006Co-Authors: Sittidej Teekateerawej, Junichi Nishino, Yoshio NosakaAbstract:Inner surface of capillary plates (CP) was coated with TiO2 to fabricate a Micro-Channel Reactor with 6-μm diameter. Titania sol was used to coat the surface of channel wall of CP and then it was calcined at 400°C for 4 h. The photocatalytic Micro-Channel Reactors were evaluated by measuring the decomposition rate of methyleneblue (MB) in aqueous solution circulating at the rate ranging from 1.2 to 5.8 cm3 min-1. The TiO2-coated CP showed a larger efficiency in decomposing MB solution, comparing with the previously reported Reactor using porous ceramics. The reaction rate increased with the flow rate, while it decreased at higher flow rates for the previous Reactor.