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Syngas Production by Methane Reforming with Carbon Dioxide on Noble Metal Catalysts 被引量:16
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作者 M.Rezaei S.M.Alavi +1 位作者 S.Sahebdelfar zi-feng yan 《Journal of Natural Gas Chemistry》 EI CAS CSCD 2006年第4期327-334,共8页
A series of noble metal catalysts (Ru, Rh, Ir, Pt, and Pd) supported on alumina-stabilized magnesia (Spinel) were used to produce syngas by methane reforming with carbon dioxide. The synthesized catalysts were cha... A series of noble metal catalysts (Ru, Rh, Ir, Pt, and Pd) supported on alumina-stabilized magnesia (Spinel) were used to produce syngas by methane reforming with carbon dioxide. The synthesized catalysts were characterized using BET, TPR, TPO, TPH, and H2S chemisorption techniques. The activity results showed high activity and stability for the Ru and Rh catalysts. The TPO and TPH analyses indicated that the main reason for lower activity and stability of the Pd catalyst was the formation of the less reactive deposited carbon and sintering of the catalyst. 展开更多
关键词 noble metal SYNGAS dry reforming carbon dioxide METHANE
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Effects of CO_2 content on the activity and stability of nickel catalyst supported on mesoporous nanocrystalline zirconia 被引量:5
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作者 M. Rezaei S.M. Alavi +1 位作者 S. Sahebdelfar zi-feng yan 《Journal of Natural Gas Chemistry》 EI CAS CSCD 2008年第3期278-282,共5页
The effects of carbon dioxide content on the catalytic performance and coke formation of nickel catalyst supported on mesoporous nanocrystalline zirconia with high surface area and pure tetragonal crystalline phase we... The effects of carbon dioxide content on the catalytic performance and coke formation of nickel catalyst supported on mesoporous nanocrystalline zirconia with high surface area and pure tetragonal crystalline phase were investigated in methane reforming with carbon dioxide. The samples were characterized by XRD, BET, TPR, TPO, TPH, TEM, and SEM techniques. The catalyst prepared showed high surface area and a mesoporous structure with a narrow pore size distribution. The obtained results revealed that the increase in CO2 content increased the methane conversion and stability of the catalyst and significantly reduced the coke deposition. The TPH analysis showed that several species of carbon with different reactivities toward hydrogenation were deposited on the spent catalysts employed under different CO2 contents. 展开更多
关键词 Ni catalysts carbon dioxide reforming coke deposition
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A Three-Dimensional Velocity-Map Imaging Setup Designed for Crossed Ion-Molecule Scattering Studies
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作者 Guo-dong Zhang Li-chang Guan +2 位作者 zi-feng yan Min Cheng Hong Gao 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2021年第1期71-80,I0011,共11页
In this study,we report the design and simulation of an electrostatic ion lens system consisting of 22 round metal plates.The opening of the extractor plate is covered withmetal mesh,which is for shielding the interac... In this study,we report the design and simulation of an electrostatic ion lens system consisting of 22 round metal plates.The opening of the extractor plate is covered withmetal mesh,which is for shielding the interaction region of the lens system from the high DC voltages applied to all other plates than the repeller and extractor plates.The Simion simulation shows that both velocity-mapping and time focusing can be achieved simultaneously when appropriate voltages are applied to each of the plates.This makes the ion lens system be able to focus large ionic volumes in all three dimensions,which is an essential requirement for crossed ion-molecule scattering studies.A three-dimensional ion velocity measurement system with multi-hit and potential multi-mass capability is built,which consists of a microchannel plate(MCP),a P47 phosphor screen,a CMOS camera,a fast photomultiplier tube(PMT),and a high-speed digitizer.The two velocity components perpendicular to the flight axis are measured by the CMOS camera,and the time-of-flight,from which the velocity component along the flight axis can be deduced,is measured by the PMT.A Labview program is written to combine the two measurements for building the full three-dimensional ion velocity in real time on a frame-by-frame basis.The multi-hit capability comes from the fact that multiple ions from the camera and PMT in the same frame can be correlated with each other based on their various intensities.We demonstrate this by using the photodissociation of CH31 at 304 nm. 展开更多
关键词 Three-dimensional image Velocity-mapping Time-focusing Ion-molecule scattering PHOTODISSOCIATION
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