| 金属离子改性NaY分子筛催化乳酸脱水制丙烯酸 |
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| 引用本文： | 闫婕,余定华,孙鹏,黄和.金属离子改性NaY分子筛催化乳酸脱水制丙烯酸[J].石油化工,2011,40(5):476-481. |
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| 作者姓名： | 闫婕 余定华 孙鹏 黄和 |
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| 作者单位： | 1. 南京工业大学生物与制药工程学院,江苏南京,210009
2. 南京工业大学生物与制药工程学院,江苏南京210009;材料化学工程国家重点实验室,江苏南京210009 |
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| 基金项目： | 国家自然科学基金项目(20906051); 江苏省基础研究计划项目(BK2009478); 南京工业大学学科基金重点项目 |
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| 摘 要： | 对乳酸脱水制取丙烯酸的热力学进行了计算,并以NaY分子筛为催化剂对乳酸脱水反应参数进行了优化;采用K+,Ba2+,La3+对NaY分子筛进行改性,并用N2物理吸附,NH3-TPD,CO2-TPD等手段对催化剂进行了表征。实验结果表明,优化的工艺条件为乳酸质量分数38%、载气N2流量30 mL/min;金属离子改性的分子筛改变了分子筛表面酸碱位点分布进而影响了催化剂的乳酸脱水性能,其中,La/NaY分子筛具有适度的酸量及最高的碱量从而呈现出优异的催化性能,在325℃时丙烯酸收率达56.3%,而NaY分子筛上丙烯酸收率只有21.6%。适当降低酸强度及酸量可提高丙烯酸收率,并可削弱乙醛的形成;而提高碱量及适度减弱碱强度可有效提高丙烯酸收率。
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| 关 键 词： | NaY分子筛催化剂 乳酸 金属离子改性 脱水 丙烯酸 |
Catalytic Dehydration of Lactic Acid to Acrylic Acid over NaY Zeolites Modified with Metallic Ions |
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| Yan Jie,Yu Dinghua,Sun Peng,Huang He.Catalytic Dehydration of Lactic Acid to Acrylic Acid over NaY Zeolites Modified with Metallic Ions[J].Petrochemical Technology,2011,40(5):476-481. |
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| Authors: | Yan Jie Yu Dinghua Sun Peng Huang He |
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| Affiliation: | Yan Jie1,Yu Dinghua1,2,Sun Peng1,Huang He1,2(1.College of Biotechnology and Pharmaceutical Engineering,Nanjing University of Technology,Nanjing Jiangsu 210009,China,2.State Key Laboratory of Materials-Oriented Chemical Engineering,China) |
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| Abstract: | The catalytic dehydration of bio-based lactic acid to acrylic acid over the unmodified and the modified NaY zeolite catalysts with K+,Ba2 + and La3 + was investigated and the thermodynamic analysis for the dehydration reaction was performed.The effects of the input concentration of lactic acid and the flow rate of nitrogen on the dehydration were studied.To improve the catalytic performance of the NaY catalyst,the NaY zeolite catalysts modified with K+,Ba2 + and La3 + were prepared and characterized by mean... |
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| Keywords: | NaY zeolite catalyst lactic acid metallic ion modification dehydration acrylic acid |
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