石油与天然气化工
石油與天然氣化工
석유여천연기화공
Chemical Engineering of Oil and Gas
2015年
5期
1-6
,共6页
氨基改性%MCM-41%低CO2%分压%吸附CO2%热力学
氨基改性%MCM-41%低CO2%分壓%吸附CO2%熱力學
안기개성%MCM-41%저CO2%분압%흡부CO2%열역학
amine-modified%MCM-41%low CO2 partial pressure%CO2 adsorption%thermodynamic
为了减少温室效应，应采取有效措施减少温室气体CO2的排放。氨基改性吸附剂是捕获烟道气中CO2的重要吸附材料。建立了描述氨基改性MCM‐41吸附剂在低CO2压力下吸附等温线的平衡模型，并计算了吸附热力学参数。该模型基于Dual‐site Langmuir模型，同时假设CO2吸附具有两种独立的吸附机理，分别是氨基基团的化学吸附和吸附剂表面的物理吸附，提出了一种基于未改性介孔材料吸附容量和比表面积计算改性材料的物理吸附量方法。结果表明，该模型能较好地拟合吸附等温线，计算得到的物理化学吸附热分别为－25．4 kJ／mol和－41．9 kJ／mol ，总吸附热为－67．3 kJ／mol ，与实验数据一致，且氨基改性MCM‐41‐TEPA饱和吸附容量可达到7．79 mmol／g。
為瞭減少溫室效應，應採取有效措施減少溫室氣體CO2的排放。氨基改性吸附劑是捕穫煙道氣中CO2的重要吸附材料。建立瞭描述氨基改性MCM‐41吸附劑在低CO2壓力下吸附等溫線的平衡模型，併計算瞭吸附熱力學參數。該模型基于Dual‐site Langmuir模型，同時假設CO2吸附具有兩種獨立的吸附機理，分彆是氨基基糰的化學吸附和吸附劑錶麵的物理吸附，提齣瞭一種基于未改性介孔材料吸附容量和比錶麵積計算改性材料的物理吸附量方法。結果錶明，該模型能較好地擬閤吸附等溫線，計算得到的物理化學吸附熱分彆為－25．4 kJ／mol和－41．9 kJ／mol ，總吸附熱為－67．3 kJ／mol ，與實驗數據一緻，且氨基改性MCM‐41‐TEPA飽和吸附容量可達到7．79 mmol／g。
위료감소온실효응，응채취유효조시감소온실기체CO2적배방。안기개성흡부제시포획연도기중CO2적중요흡부재료。건립료묘술안기개성MCM‐41흡부제재저CO2압력하흡부등온선적평형모형，병계산료흡부열역학삼수。해모형기우Dual‐site Langmuir모형，동시가설CO2흡부구유량충독립적흡부궤리，분별시안기기단적화학흡부화흡부제표면적물리흡부，제출료일충기우미개성개공재료흡부용량화비표면적계산개성재료적물리흡부량방법。결과표명，해모형능교호지의합흡부등온선，계산득도적물이화학흡부열분별위－25．4 kJ／mol화－41．9 kJ／mol ，총흡부열위－67．3 kJ／mol ，여실험수거일치，차안기개성MCM‐41‐TEPA포화흡부용량가체도7．79 mmol／g。
To reduce the greenhouse effect ,effective measures should be taken to reduce the emis‐sions of CO2 .Amine‐modified adsorbents are considered as important adsorbent materials to capture CO2 .In this paper ,a balance model was established to describe the adsorption isotherms of amine modified MCM‐41 under low CO2 partial pressure and the thermodynamic parameters was calculated . The model was based on Dual‐site Langmuir model and assumed that there were two independent ad‐sorption mechanisms :chemical adsorption on amine groups and physical adsorption via surface area . In order to distinguish the physical adsorption and chemical adsorption of amine modified adsorbents , a new method based on adsorption of non‐modified adsorbents and surface area was proposed .The re‐sults showed that the model could fit well with the measured adsorption isotherms .The calculated physical and chemical adsorption heats are -25 .4 kJ/mol and -41 .9 kJ/mol respectively ,the total adsorption heats is -67 .3 kJ/mol ,which were in accordance with the experimental data .The satura‐tion adsorption capacity of MCM‐41‐TEPA could reach 7 .79 mmol/g .
