| CaO对Pt/C催化硬脂酸脱羧反应性能的影响 |
| |
| 引用本文： | 胡慧敏,程乐明,张荣,毕继诚.CaO对Pt/C催化硬脂酸脱羧反应性能的影响[J].燃料化学学报,2013,41(7):850-855. |
| |
| 作者姓名： | 胡慧敏 程乐明 张荣 毕继诚 |
| |
| 作者单位： | 1. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China |
| |
| 基金项目： | 国家自然科学基金青年科学基金(21006123) |
| |
| 摘 要： | 以硬脂酸(C17H35COOH)脱羧为探针反应,研究了亚临界水中CaO对Pt/C催化脱羧反应性能的影响.实验表明,CaO可以促进脱羧反应,对十七烷选择性没有影响.CaO/硬脂酸物质的量比为0.5时,在330 ℃反应1 h,硬脂酸转化率由未添加CaO时的46.06%提高到66.99%.硬脂酸催化脱羧的最佳反应温度为350 ℃,高于这一温度时,烷基链上碳碳键断裂的副反应增加,导致十七烷选择性降低.亚临界水中硬脂酸脱羧反应符合一级动力学,建立的动力学方程可以较好地预测不同反应条件下十七烷的产率.根据实验结果推测,氧化钙与硬脂酸反应生成硬脂酸钙,催化剂表面的吸附态羧酸盐增加,从而提高了脱羧反应的速率.
|
| 关 键 词： | 氧化钙 硬脂酸 脱羧 亚临界水 |
| 收稿时间： | 2013-03-19 |
Effect of CaO on decarboxylation of stearic acid over Pt/C catalyst |
| |
| HU Hui-min,CHENG Le-ming,ZHANG Rong,BI Ji-cheng.Effect of CaO on decarboxylation of stearic acid over Pt/C catalyst[J].Journal of Fuel Chemistry and Technology,2013,41(7):850-855. |
| |
| Authors: | HU Hui-min CHENG Le-ming ZHANG Rong BI Ji-cheng |
| |
| Institution: | 1(1.State Key Laboratory of Coal Conversion,Institute of Coal Chemistry,Chinese Academy of Sciences,Taiyuan 030001,China; 2.University of Chinese Academy of Sciences,Beijing 100049,China) |
| |
| Abstract: | The effects of CaO addition and temperature on decarboxylation of stearic acid over Pt/C catalyst in subcritical water were investigated. The conversion of stearic acid increased dramatically, while the selectivity to heptadecane hardly changed with the addition of CaO. At 330 ℃ the conversion of stearic acid reached a maximum with Ca/stearic mol ratio of 0.5. Moreover, Pt/C catalyzed decarboxylation of stearic acid in subcritical water exhibited first-order kinetics. It was proposed that dissociative stearic acid was adsorbed on Pt/C catalyst, forming surface octadecanoate species and adsorbed H. The C-C bond dissociated via H insertion, resulting in the formation of heptadecane and CO2. The addition of CaO promoted the dissociation of stearic acid. As a result, the amount of adsorbed octadecanoate increased and the reaction was accelerated. |
| |
| Keywords: | calcium oxide stearic acid decarboxylation subcritical water |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《燃料化学学报》浏览原始摘要信息 |
| 点击此处可从《燃料化学学报》下载免费的PDF全文 |
|
