多孔白云石颗粒催化剂的研制和评价
文献类型：学位论文
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| 作者 | 巩伟 |
| 学位类别 | 硕士 |
| 答辩日期 | 2009-05-31 |
| 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 | 阴秀丽 |
| 关键词 | 生物质 焦油 白云石 催化裂解 动力学模型 Ni基催化剂 半焦 |
| 其他题名 | Preparation and Experimental Study of the Porous Granular Dolomite |
| 中文摘要 | A great deal of concern and research have been dedicated to biomass which is thought of as a kind of green and renewable resource owning to the drain of traditional fossil energy and drastic environment problems. Among various biomass utilization technologies, gasification process is the key one. Through biomass gasification, various solid biomass could be gasified into combustible gas, which will be transformed into liquid fuel, chemicals or generates electricity using internal combustion engine or gas turbine. However, tar forms during the gasification process that eliminates the gasification efficiency, fouls downstream pipelines and equipments, influences the functions of power generating facilities, and undermines the promotion of biomass gasification technology. So, developing a high-efficiency low-cost process applied to reducing tar is more meaningful than before. As an effective way purifying the product gas, increasing attention has been paid to catalytic decomposition of biomass tar. Dolomite, as a kind of effective catalyst used to catalytic cracking biomass tar, notwithstanding the widely distribution and low cost, a common disadvantage is inevitable that under the working condition, dolomite’s mechanical intensity decreases, especially in the fluidized bed. In order to handle the disadvantages of low intensity, easy wore-out, etc. This dissertation developed the porous granular dolomite (PGD), utilizing dolomite powder and other materials, following the procedures of mix, granulation, desiccation and calcinations. The porous granular dolomite’s intensity was 13.3N, specific surface area was 17.8m2/g, and specific pore volume was 0.78cm3/g. A set of experiments were performance to inspect the catalytic properties of porous granular dolomite, Ni catalyst and biomass tar. These experiments inspected the affects of temperature (600℃～900℃) and contact time (0.3s～2.0s) on the conversion and selectivity rates of acetic acid and benzene as feedstock (tar model compound) using PGD, Ni-based catalyst and char as catalysts; The deactivation and regeneration attributes of Ni-based catalyst and PGD were also tested. Results indicated that the conversion and selectivity rates of acetic acid and benzene increased with increasing temperature and contact time: the acetic acid and benzene conversion rates using PGD as catalyst reached their maximum 99.8% and 18.7% at 850℃, 0.5s, respectively. When using Ni-based catalyst and char, the benzene conversion reached their maximum 90.2% and 48.3% at 850℃, 1.1s, respectively. There generated little carbon deposition when PGD was select as catalyst at 600℃～700℃, while the temperature increased to 850℃, the carbon deposition accounted for almost a half of the total converted benzene. When Ni-based catalyst was selected, the carbon deposition accounted for less than 10% of the converted benzene at 700℃ where contact time was larger than 0.9s, while the carbon deposition accounted for less than 20% at 0.5s where temperature was larger than 800℃. When char was selected as catalyst, values of selectivity rates were quite small, so almost all of the benzene cracked was converted to the form of carbon deposition. A mathematical analyst of the dynamic experiment data was performed; as a result, a macroscopic reaction dynamic model was established, based on the hypothesis that a one-order reaction, plug flow model and Arrhenius equation were acceptable. Results were the active energy of cracking acetic acid and benzene using PGD as catalyst were 71.4kJmol-1 and 94.5kJmol-1, A’s were 6680s-1 and 2930s-1, respectively. The active energy of cracking benzene using Ni-based catalyst and char were 50.69kJmol-1 and 57.27kJmol-1, A’s were 1268.77s-1 and 283.7s-1, respectively. At last, by comparison, the calculated values agreed well with the experimental data. |
| 语种 | 中文 |
| 公开日期 | 2011-07-14 ; 2011-07-15 |
| 页码 | 96 |
| 源URL | [http://ir.giec.ac.cn/handle/344007/5846]  |
| 专题 | 中国科学院广州能源研究所 |
| 推荐引用方式 GB/T 7714 | 巩伟. 多孔白云石颗粒催化剂的研制和评价, Preparation and Experimental Study of the Porous Granular Dolomite[D]. 广州能源研究所. 中国科学院广州能源研究所. 2009. |
入库方式： OAI收割
来源：广州能源研究所
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