CAJ | 학술논문

CH4和CO2的大量排放是造成温室效应的主要因素,在全世界范围内对排放的CH4和CO2进行回收和利用是非常必要的.变压吸附是有效的气体分离技术,而高选择性吸附剂是变压吸附技术的关键.将DIPA(二异丙醇胺)负载在介孔分子筛上,使介孔分子筛的介孔和胺作用结合起来,合成了高选择性CO2/CH4分离吸附剂.首先以水热法合成SBA-15介孔分子筛,通过表征分析,其具有高度有序的六方结构,而DIPA改性后的SBA-15仍然保持介孔分子筛的有序结构,且DIPA基本都进入孔道内.SBA-15经DIPA改性后,CO2/CH4选择分离性能大大提高,分离因子达46.75,吸附的CH4可完全再生,吸附的CO2只能部分再生.负载DIPA对CH4的吸附容量没有明显影响,但大大提高CO2的吸附容量.在6次稳定性实验后,对CH4、CO2的吸附量保持稳定,CH4/CO2的分离因子在15.5左右.随操作温度的升高,DIPA改性SBA-15对CO2吸附容量增大,通过单塔吸附再生的性能比较,45℃时CO2吸附再生的综合性能最好.
CH4화CO2적대량배방시조성온실효응적주요인소,재전세계범위내대배방적CH4화CO2진행회수화이용시비상필요적.변압흡부시유효적기체분리기술,이고선택성흡부제시변압흡부기술적관건.장DIPA(이이병순알)부재재개공분자사상,사개공분자사적개공화알작용결합기래,합성료고선택성CO2/CH4분리흡부제.수선이수열법합성SBA-15개공분자사,통과표정분석,기구유고도유서적륙방결구,이DIPA개성후적SBA-15잉연보지개공분자사적유서결구,차DIPA기본도진입공도내.SBA-15경DIPA개성후,CO2/CH4선택분리성능대대제고,분리인자체46.75,흡부적CH4가완전재생,흡부적CO2지능부분재생.부재DIPA대CH4적흡부용량몰유명현영향,단대대제고CO2적흡부용량.재6차은정성실험후,대CH4、CO2적흡부량보지은정,CH4/CO2적분리인자재15.5좌우.수조작온도적승고,DIPA개성SBA-15대CO2흡부용량증대,통과단탑흡부재생적성능비교,45℃시CO2흡부재생적종합성능최호.
Accumulation of CO2 and CH4 in the atmosphere is considered responsible for greenhouse effect and the world climate change, therefore, capture of CO2 and CH4 from the mixture gas becomes an inevitable task. Pressure swing adsorption (PSA) is an effective method to separate mixture gas, and its key is to find a selective and efficient adsorbent. A modified adsorbent for high selective separation of CO2/CH4 was prepared by amine-functionalizing the hydrothermal synthetic mesoporous silica SBA-15 with DIPA. The modified and unmodified SBA-15 were characterized by different methods, and their ordered structural properties were confirmed. The pore space was totally fdled with DIPA in the DIPA-modified SBA-15. For the DIPA-modified SBA-15, the CO2/CH4 selective separation performance was greatly improved, and the separation coefficient could be up to 46.75, while the adsorption of CH4 was reversible, but the adsorption of CO2 was only partially reversible. Loaded DIPA did not remarkably reduce the adsorption capacity of CH4, but considerably increased the adsorption capacity of CO2 To test the reversibility of CH4 and CO2 adsorption on the DIPA-modified SBA-15, saturated adsorption and regeneration were repeatedly performed in a single column packed with the DIPAcoated SBA-15. After 6 adsorption-regeneration cycles, the adsorption of CH4 and CO2 were reversible with a constant adsorption capacity, and right now the separation coefficient was 15.5. The CO2 adsorption capacity of DIPA modified SBA-15 increased with temperature. Considering beth adsorption capacity and regeneration of CO2 DIPA modified SBA-15 showed best performance at 45℃.