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methane coupling Using Hydrogen Plasma and Pt/γ-Al_2O_3 Catalyst

Chinese Chemical Letters 2002年第8期13卷 711-713页

作者： BinDAI WeiMinGONG 等 DepartmentofChemistry ShiheziUniversityShihezi832002 PlasmaChemistryLaboratory DalianUniversityofTechnologyDalian116012

In this paper, methane coupling at ambient temperature, under atmospheric pressure and in the presence of hydrogen was firstly investigated by using pulse corona plasma and Pt/g-Al2O3 catalyst. Experimental results showed that Pt/g-Al2O3 catalyst has catalytic activity for methane coupling to C2H4. Over sixty percent of outcomes of C2 hydrocarbons were detected to be ethylene.

关键词： Pulse corona plasma methane coupling hydrogen Pt/g-Al2O3 catalyst.

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Minimizing carbon deposition in plasma-induced methane coupling with structured hydrogenation catalysts

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Journal of Energy Chemistry 2021年第7期30卷 271-279页

作者： Nuria García-Moncada Toine Cents Gerard van Rooij Leon Lefferts Catalytic Processes and Materials(CPM) TNW FacultyUniversity of TwenteP.O.Box 2177500 AE EnschedeThe Netherlands Sasol Holding Netherlands B.V. 7544 GG EnschedeThe Netherlands Nonequilibrium Fuel Conversion DIFFER5612 AJ EindhovenThe Netherlands

The effect of temperature and hydrogen addition on undesired carbonaceous deposit formation during methane coupling was studied in DBD-plasma catalytic-wall reactors with Pd/Al2 O3, using electrical power to drive the reaction.Experiments with thin catalyst layers allowed comparison of the performance of empty reactors and catalytic wall reactors without significantly influencing the plasma properties.The product distribution varies strongly in the temperature window between 25 and 200℃Minimal formation of deposits is found at an optimal temperature around 75℃ in the catalytic-wall reactors.The selectivity to deposits was c.a.10% with only 9 mg of catalyst loading instead of 45% in the blank reactor,while decreasing methane conversion only mildly.Co-feeding H2 to an empty reactor causes a similar decrease in selectivity to deposits,but in this case methane conversion also decreased significantly.Suppression of deposits formation in the catalytic-wall reactor at 75℃ is due to catalytic hydrogenation of mainly acetylene to ethylene.In the empty reactor,H2 co-feed decreases conversion but does not change the product distribution.The catalytic-wall reactors can be regenerated with H2-plasma at room temperature,which produces more added-value hydrocarbons.

关键词： Dielectric barrier discharge(DBD)plasma-catalysis Structured reactor methane coupling H_(2)co-feed Temperature optimization Carbon deposits

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Dense ceramic hollow fibre membrane for oxidative coupling of methane

Dense ceramic hollow fibre membrane for oxidative coupling o...

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2006年中国固态离子学暨国际电动汽车动力技术研讨会

作者： Xiaoyao Tan and Zhaopao Pang College of Chemical Enginemng Shandong University of Technology Zibo Shandong PR China 255049

＜正＞Dense ceramic membranes are based on the ionic transport mechanism under the electrochemical potential gradient for gas permeation. They are fabricated from ionic and electronic mixed conducting ceramic oxides usually of perovskite structure that conduct charged species such as oxide ions, protons and electrons/electron holes at elevated temperatures. Such dense ceramic membranes have significant future potential for the industrial gas and energy industries with a wide variety of applications, for example the separation of oxygen from air, and the catalytic conversion of paraffins into olefins. However, in order to develop the membrane system for industrial use, it is essential to improve not only the oxygen permeation flux of the membrane materials, but also the ceramic membrane systems, which are stable in the hash environment. La0.6Sr0.4Co0.2Fe0.8O3-δ （LSCF）, an oxygen ion and electron hole mixed conducting ceramic, hollow fibre membranes have been prepared successfully by means of a phase inversion spinning/sintering technique, where polyethersulfone （PESf） is used as a binder, N-methyl-2-pyrrollidone （NMP） as solvent and polyvinylpyrrolidone （PVP, K16-18） as an additive, respectively. Such membranes in the hollow fibre configuration can provide much larger effective area per volume, and can remarkably reduce the resistance to oxygen permeation due to the asymmetric structure （i.e. a thin separating dense layer integrated with the porous layers）. Using the prepared LSCF hollow fiber membranes with the gas-tight property, a hollow fibres membrane reactor has been fabricated for oxidative coupling of methane （OCM）. The performances of the membrane reactor at different operating modes, operating temperatures and feed flow rates have been investigated experimentally. The results indicate that the maximum C2 yield may reach 15.3% with the corresponding selectivity of 33.8% in the hollow fibre membrane reactor at 950 ℃ wehn the feed flow rates of CIV Ar mixture and air are 17.2 and 32.9 cm3（STP）/min, respectivel

关键词： Hollow fibre membrane reactor methane coupling

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Photocatalytic Conversion of CO2 to C2+ Hydrocarbon Fuels

Photocatalytic Conversion of CO2 to C2+ Hydrocarbon Fuels

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中国化学会第十九届全国催化学术会议

作者： Jinlin Long State Key Laboratory of Photocatalysis on Energy and Environment College of Chemistry Fuzhou University

The direct production of renewable hydrocarbon fuels from sunlight, CO and water by artificial photosynthetic systems could provide a scalable grid storage technology for powering the planet. The photocatalyzed conversion of solar-to-hydrocarbon fuels at high efficiency and high product selectivity has thus received intense attention worldwide over the past decades,

关键词： Photocatalysis CO2 methane coupling hydrocarbon fuels

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