第18卷第1期 2018年2月
反应与分离
过程工程学报
The Chinese Journal of Process Engineering
VoL.18 No.1 Feb.2018
DOI:10.12034/j.issn.1009-606X.217229
升温速率对CO2在13X分子筛上脱附性能的影响郭亚楼"，张辉”，刘应书"，赵梓伶"，张宣凯"，李东！
(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)
摘要：采用程序升温脱附技术研究了升温速率对COz在13X上脱附性能的影响，基于Polanyi-Wigner方程在无假定条件的情和高温峰)：改变升温速率绘影响Ed，随研高，低温峰的脱附活化能EdL呈对数规律减小，高温峰的脱附活化能EaH基本不变且EdL>QuH：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：升温速率；脱附活化能：脱附量；脱附双峰：二氧化碳：13X分子筛
中图分类号：TQ028.1
文献标识码：A
文章编号：1009-606X(2018)01-0088-08
ImpactofHeatingRateonDesorptionPerformanceofCO2Attachedto13XZeolite
Yalou GUO',Hui ZHANG2",Yingshu LIU',Ziling ZHAO',Xuankai ZHANG',Dong LI
(I. School of Energy and Ervironmental Engineering, University of Science and Technology Bejing, Beijing 100083, China;
2.Bejing Key Laboratory of Energy Conservation and Emission Reduction forMetallurgical Industry,
University of Scienceand TechnologyBeijing,Bejing 100083,China)
oeoeeaeeareeoeae CO2 attached to 13X zeolite, Based on the PolanyiWigner equation, the desorption activation energy Ed under different heating rates(P) 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, Ea changed with β. The low-temperature peak related to the desorption activation energy Ed, decreased logarithmically with respect to increasing β, while Eah remained the same, and the value of Eau was smaller than that of Ed,h. So Ea 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 at low temperature called Qa, increased gradually ooaaeeeeaaeaae 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: heating rate; desorption activation energy; desorption amount; desorption double-peak; carbon dioxide; 13X zeolite
1
前言
CO2是空气、高炉煤气、沼气、天然气等混合气中
的杂质气体，在空分制氧预处理、能源气体提纯、尾气净化等工艺中需通过变压吸附或变温吸附将其脱除以获得高品质气源(1-4]，由于CO2是一种强吸附质，必须提高真空度或解吸温度才能脱附，增加了生产成本，掌握
CO2脱附过程和机理，合理设计脱附步骤，优化脱附条件，可有效降低解吸能耗，有助手节能减排
脱附过程是吸附质从吸附剂表面活性点通过解吸、内扩散和外扩散等传质步骤进入流体主相的过程[5.6], 脱附活化能E。反映了吸附质从吸附剂表面解吸的难易程度，是表征脱附量与脱附温度的基本热力学参数.程序升温脱附(TemperatureProgrammedDesorption，TPD）
收稿日期：2017-0503，修回日期：2017-06-15
基金项目：中央高校基本科研业务费专项资金资助项目(编号：FRF-BD-16-009A,FRF-IC-16-002)
作者简介：郭亚楼(1993-)，男，河北省保定市人，硕士研究生，动力工程及工程热物理专业；张辉，通讯联系人，E-mail:zhanghui56@ustb.edu.cn 引用格式：郭亚楼，张辉，刘应书，等.升温速率对CO在13X分子筛上脱附性能的影响。过程工程学报，2018,18(1)：88-95.
Guo Y L, Zhang H, Liu Y S, et al. Impact of Heating Rate on Desorption Performance of CO, Attached to 13X Zeolite (in Chinese) Chin. J. Process Eng., 2018, 18(1): 8895, DOl: 10.12034/j.issn.1009-606X.217229
万方数据