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Characterization of carbon deposits Formed During Plasma Pyrolysis of Xinjiang Candle Coal

Plasma Science and Technology 2009年第4期11卷 487-492页

作者：朱桂林孟月东舒兴胜方世东 Institute of Plasma Physics Chinese Academy of Sciences

carbon deposits were formed on the reactor wall during plasma pyrolysis of the Xinjiang candle coal in our V-style plasma pyrolysis pilot-plant. The carbon deposits were studied using a scanning electronic microscope （SEM） and the X-ray diffraction （XRD） method. It was found that carbon deposits located at different parts in the reactor exhibited different microscopic patterns. The formation mechanism of the carbon deposits was deduced. The downward increase in the graphitization degree of the carbon deposits was found and interpreted.

关键词： coal plasma pyrolysis carbon deposits SEM XRD

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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 *** with thin catalyst layers allowed comparison of the performance of empty reactors and catalytic wall reactors without significantly influencing the plasma *** 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 *** 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 ***-feeding H2 to an empty reactor causes a similar decrease in selectivity to deposits,but in this case methane conversion also decreased *** of deposits formation in the catalytic-wall reactor at 75℃ is due to catalytic hydrogenation of mainly acetylene to *** the empty reactor,H2 co-feed decreases conversion but does not change the product *** 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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In situ catalytic conversion of biomass fast pyrolysis vapors on HZSM–5

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Journal of Energy Chemistry 2016年第3期25卷 427-433页

作者： Yindi Zhang Ping Chen Hui Lou Institute of Catalysis Department of Chemistry Zhejiang University

In situ catalytic conversion of biomass fast pyrolysis vapors was carried out on HZSM-5 with varying Si/Al ratios(ranging from 20 to 300) at 450 °C. The effects of Si/Al ratios of HZSM-5 zeolites on the distribution of biomass fast pyrolysis products and carbon deposits on catalysts were investigated. It was quite remarkable that after in situ catalytic conversion the amount of light phenols and hydrocarbons increased significantly while that of heavy phenols decreased a lot. Besides, the yield of cyclopentenones with relatively low oxygen content generally increased. It also indicated that as the Si/Al ratios of HZSM-5 increased, the amount of hydrocarbons and light phenols was found to drop greatly. The amount of carbon deposits was found to be around 8.5% with the exception of HZSM-5 with the Si/Al ratio of 300,which is much lower. Moreover, the carbon deposits yield dropped gradually with increasing Si/Al ratios of *** of spent catalysts at 600 °C helped to restore the catalytic activity to a large extent despite a relatively lower efficiency of deoxygenation. Results indicated that HZSM-5 with relatively high acidity displayed great catalytic performance.

关键词： Fast pyrolysis In situ catalytic conversion HZSM-5 Si/Al ratio carbon deposits

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