碱金属蒸气对整体式镍基催化剂重整性能的影响
文献类型：学位论文
| ; | |
| 作者 | 高妍 |
| 学位类别 | 硕士 |
| 答辩日期 | 2008-06-04 |
| 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 | 王铁军 |
| 关键词 | 生物质合成气 催化重整 整体式催化剂 碱金属蒸气 |
| 其他题名 | The Effects of alkali vapor over Ni-based monolithic catalyst for biomass fuel gas reforming |
| 中文摘要 | As one of the most promising renewable energy, biomass fuel gas from gasification has been applied in various areas, such as liquid fuel synthesis and solid oxide fuel cell. However, the fuel gas could not be utilized directly in synthesis of liquid fuel because of its low content of H2 and low ratio of H2/CO. In addition, biomass gasification is inevitably accompanied by the formation of tar and inorganic impurities, which possesses negative influence on gasification process and utilization of product gas as well. It has been well-known that tar causes such serious problems as tube blocking and deactivation of catalyst. Similarly, some alkali elements, which are generally used as the nutrient for plants and abundant in the biomass feedstock e.g. potassium, are apt to vaporize and form alkali compounds, such as KCl, K2SO4, NaCl, leading to the elemental deposition inside the equipments and corruption of devices downstream by aerosol, even the catalyst deactivation ultimately. Until recently, studies have been focused on cleanup of biomass raw fuel gas. Previously, commercial Ni-based catalyst faced challenges like carbon deposition, agglomeration and loss of active phases. Whereas, honeycomb monolithic catalysts, characterized as low pressure drop and low axial temperature gradient, mitigate these problems. In this paper, NiMgO/-Al2O3 monolithic catalyst was prepared by two-step impregnation. Its performance in biomass fuel gas reforming was investigated. By screening out the optimal ratio of Ni/Mg from different catalysts, the effects of alkali vapor on NiMgO/-Al2O3 monolithic catalyst was studied in the reaction of dry reforming of biomass fuel gas. The experimental results are listed below: 1 The self-made monolithic catalyst showed high activity and stability. After 60 h reaction at 750℃, the outlet gas composition almost maintained the same. From the results of catalyst characterization, high dispersion of Ni prevent agglomeration and no obvious carbon deposition was observed. 2 By comparing different catalysts in biomass fuel gas reforming, the catalyst( Ni/Mg=1) showed high CH4 conversion and optimal H2/CO. 3 The effects of fly ash on the catalyst performance in practical biomass fuel gas reforming was modeled, the concentration of alkali in fuel gas was much higher than that under practical condition. 4 Catalyst activity decreased with the coverage of alkali on the surface of catalyst. It showed no necessary connection between the catalyst deactivation and melting point. Additionally, deposition of alkali had influence on the BET area and pore structure. No sintering of Ni was observed by XRD characterization. |
| 语种 | 中文 |
| 公开日期 | 2011-07-14 ; 2011-07-15 |
| 页码 | 67 |
| 源URL | [http://ir.giec.ac.cn/handle/344007/5798]  |
| 专题 | 中国科学院广州能源研究所 |
| 推荐引用方式 GB/T 7714 | 高妍. 碱金属蒸气对整体式镍基催化剂重整性能的影响, The Effects of alkali vapor over Ni-based monolithic catalyst for biomass fuel gas reforming[D]. 广州能源研究所. 中国科学院广州能源研究所. 2008. |
入库方式： OAI收割
来源：广州能源研究所
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