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题名	镍基整体式催化剂及其耦合重整净化生物质粗燃气性能研究
作者	王晨光
学位类别	博士
答辩日期	2009-05-27
授予单位	中国科学院广州能源研究所
授予地点	广州能源研究所
导师	马隆龙
关键词	镍基整体式催化剂 生物质燃气 重整 脉冲电晕
其他题名	Ni based monolithic catalyst coupled reforming biomass fuel gas
学位专业	热能工程
中文摘要	With the rapid develop of economy recently, power and fuel supply problem has been more and more serious, more attention is paid on energy problem. Of all the sources of renewable energy, biomass is the unique renewable source of carbon and named as green coal. Biomass to liquid technology is one of the most promising routine for the liquid fuel which can replace fossil fuel. Production of synthesis gas is the key step. In this article , high stable NiO-MgO solid solution monolithic catalyst was used to produce synthesis gas. It is very important to the production of carbon neutral fuels, solve the shortage problem of energy and rapid development of economy Biomass gasification and liquid fuel synthesis technologies are mature. Biomass fuel gas deeply cleaning and quality promotion are the bottleneck of the utilization of biomass. Commercial steam reforming Ni-based catalysts will rapidly lost their activity in real biomass gasification conditions because of carbon deposition. In order to promote the stability and reduce cost. In the present work, highly stable NiO-MgO solid solution monolithic catalyst was prepared by two step impregnation. The effect of preparation conditions on the catalysts structure and performance was investigated. The performance of different reforming conditions were also investigated. Biomass fuel gas reforming character and synthesis gas adjust were also studies. Plasma-catalytic reforming of biomass fuel gas was also investigated. The results obtained are listed below: 1.Ni-based monolithic catalyst can effectively reforming biomass fuel gas. The conversion of CH4 and CO2 are 90% under 750oC, H2/CO ratio was also kept at 1.0. In 108 hours reforming test, no pressure change was detected, catalyst showed good anti-carbon and pressure drop abilities because of the straight structure. In life test, conversion of CH4 and CO2 were kept at 90% which means the catalyst has high activity and good stability. NiO-MgO solid solution monolithic catalyst has excellent reforming activity and high stability. Conversion of CH4 can be higher than 95% at 750oC and H2/CO ratio was promoted to 1.2. 60 hours life test shows that NiO-MgO solid solution monolithic catalyst has excellent reforming activity, stability and anti-carbon deposition ability. Tar model compound naphthalene was completely converted to gas and lighter compounds over both catalysts. Two catalysts showed good tar elimination ability. 2.Partial oxidation reforming can effectively promote the reaction efficiency, CH4 conversion and H2, CO content in synthesis gas. It can also promote the H2/CO ratio to 1.1. The addition of O2 raised the tar elimination ability of the catalyst, especially the high concentration species and derivative of benzene which were difficult to convert in dry reforming. 60 hours life tests of partial oxidation reforming and dry reforming showed that catalyst in partial oxidation reforming had higher activity and stability, H2/CO ratio in outlet synthesis gas over partial oxidation reforming was higher than dry reforming. Synthesis gas produced by partial oxidation reforming is more suitable for liquid fuel synthesis. The addition of O2 will promote the stability and activity of the catalyst. TG results showed that O2 content change will change the carbon content and species on the surface of the catalyst. When O2/fuel reached 0.127, catalyst showed excellent anti-carbon deposition ability. Steam reforming can promote the H2/CO ratio and adjust it between 1-5. The addition of steam can also promote the conversion of CH4 in biomass fuel gas, which is caused by active oxide produced by H2O cracking during reforming. 60 hours life test showed that steam reforming can effective promote the stability and reforming efficiency, steam reforming can also prevent carbon deposition on the surface of the catalyst. 3.High voltage plasma excite biomass fuel gas molecules and then use catalytic reforming at 750oC to adjust gas components in outlet synthesis gas can promote the quality of synthesis gas make it more suitable for liquid fuel synthesis. Experiments with different frequency show that higher frequency will promote CH4, CO2 conversion, H2/CO ratio and H2 selectivity. Plasma-catalyt coupled reforming can eliminate tar in biomass fuel gas effectively. Higher reaction temperature will produce higher conversion of CH4 and CO2, it can also promote the selectivity of H2.XRD patterns show that plasma-catalyt coupled reforming can effectively prevent the catalyst from sintering and carbon deposition on the surface of the catalyst. 4. Heat transfer is the main effect of catalyst performance, a suitable burner can produce enough power to the reformer. The design of reformer should pay more attention on heat transfer to the catalyst. Pressure test results showed that NiO-MgO solid solution monolithic catalyst can avoid pressure raise rapidly because of its special structure. NiO-MgO solid solution catalysts can adjust biomass fuel gas. Plenty of ash is the main reason of pressure raise in reformer.
语种	中文
公开日期	2011-07-14
页码	160
内容类型	学位论文
源URL	[http://ir.giec.ac.cn/handle/344007/5834]
专题	中国科学院广州能源研究所
推荐引用方式 GB/T 7714	王晨光. 镍基整体式催化剂及其耦合重整净化生物质粗燃气性能研究[D]. 广州能源研究所. 中国科学院广州能源研究所. 2009.

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