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过程工程学报 ›› 2018, Vol. 18 ›› Issue (1): 88-95.DOI: 10.12034/j.issn.1009-606X.217229

• 反应与分离 • 上一篇    下一篇

升温速率对CO2在13X分子筛上脱附性能的影响

郭亚楼1, 张 辉2*, 刘应书1, 赵梓伶1, 张宣凯1, 李 东1   

  1. 1. 北京科技大学能源与环境工程学院,北京 100083;2. 北京科技大学冶金工业节能减排北京市重点实验室,北京 100083
  • 收稿日期:2017-05-03 修回日期:2017-06-15 出版日期:2018-02-22 发布日期:2018-01-29
  • 通讯作者: 张辉.
  • 基金资助:
    国家高技术研究发展计划项目;中央高校基本科研业务专项资金

Impact of Heating Rate on Desorption Performance of CO2 Attached to 13X Zeolite

Yalou GUO1,  Hui ZHANG2*,  Yingshu LIU1,  Ziling ZHAO1,  Xuankai ZHANG1,  Dong LI1   

  1. 1. School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China; 2. Beijing Key Laboratory of Energy Conservation and Emission Reduction for Metallurgical Industry, University of Science and Technology Beijing, Beijing 100083, China
  • Received:2017-05-03 Revised:2017-06-15 Online:2018-02-22 Published:2018-01-29
  • Contact: ZHANG Hui

摘要: 采用程序升温脱附技术研究了升温速率对CO2在13X上脱附性能的影响,基于Polanyi?Wigner方程在无假定条件的情况下计算了不同升温速率下的脱附活化能(Ed). 结果表明,13X分子筛在常温下吸附CO2后,脱附时会产生两个脱附峰(低温峰和高温峰);改变升温速率?会影响Ed,随?升高,低温峰的脱附活化能Ed,L呈对数规律减小,高温峰的脱附活化能Ed,H基本不变,且Ed,L<Ed,H,无假设情况下Ed的计算结果比升温速率变化法计算结果更具合理性和准确性;吸附量相同时,随?升高,CO2的低温脱附量Qd,L逐渐增大而高温脱附量Qd,H逐渐减小,且Qd,L>>Qd,H;物理吸附与化学吸附作用力的差异造成两峰吸脱附机理存在根本差别.

关键词: TPD, 升温速率, 脱附活化能, 脱附量, 脱附双峰, 二氧化碳, 13X分子筛

Abstract: Temperature programmed desorption (TDP) was used to investigate the impact of heating rate on desorption performance of CO2 attached to 13X zeolite. Based on the Polanyi?Wigner equation, the desorption activation energy Ed under different heating rates was calculated without any assumed conditions. The results showed that two desorption peaks on TPD curve were produced while heating 13X molecular sieve full of CO2 at room temperature, one was located at low temperature, called as low-temperature peak, the other was at high temperature, called as high-temperature peak. Ed changed with ?. The low-temperature peak related to the desorption activation energy Ed,L decreased logarithmically with respect to increasing ?, while Ed,H remained the same, and the value of Ed,L was smaller than that of Ed,H. So Ed calculated without assumptions were more reasonable and accurate than the value calculated by variable heating rate method. For the same adsorption capacity, desorption capacity of CO2 called Qd,L at low temperature increased gradually with the growth of ?, while Qd,H at high temperature decreased, and Qd,L was far greater than Qd,H. The different acting force of physisorption and chemisorption was the key factor that resulted in a difference between high-temperature peak and low-temperature peak on adsorption mechanism.

Key words: TPD, heating rate, desorption activation energy, desorption amount, desorption double-peak, carbon dioxide, 13X zeolite