Article(id=1236345969705545951, tenantId=1146029695717560320, journalId=1210938733613449225, issueId=1236345965947449499, articleNumber=null, orderNo=null, doi=10.19666/j.rlfd.202412190, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=null, receivedDateStr=null, revisedDate=1733328000000, revisedDateStr=2024-12-05, acceptedDate=null, acceptedDateStr=null, onlineDate=1772697449374, onlineDateStr=2026-03-05, pubDate=1750780800000, pubDateStr=2025-06-25, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1772697449374, onlineIssueDateStr=2026-03-05, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1772697449374, creator=13701087609, updateTime=1772697449374, updator=13701087609, issue=Issue{id=1236345965947449499, tenantId=1146029695717560320, journalId=1210938733613449225, year='2025', volume='54', issue='6', pageStart='1', pageEnd='210', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1772697448479, creator=13701087609, updateTime=1772697609456, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1236346641175859638, tenantId=1146029695717560320, journalId=1210938733613449225, issueId=1236345965947449499, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1236346641175859639, tenantId=1146029695717560320, journalId=1210938733613449225, issueId=1236345965947449499, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=90, endPage=96, ext={EN=ArticleExt(id=1236345969982370034, articleId=1236345969705545951, tenantId=1146029695717560320, journalId=1210938733613449225, language=EN, title=Study on K2CO3/PEI functionalized porous TiO2 and CO2 capture performance, columnId=1236345968304640424, journalTitle=Thermal Power Generation, columnName=Innovation and process optimization of carbon capture technology, runingTitle=null, highlight=null, articleAbstract=

The TiO2 surface is functionalized with different concentrations of K2CO3 and polyethyleneimine (PEI), and in-depth research on CO2 adsorption performance and mechanism is conducted. CO2 low-temperature adsorbent was successfully prepared by ultrasonic impregnation method using K2CO3 and PEI as functionalized materials and commercial selective catalytic reduction (SCR) catalyst white embryo (porous TiO2) as carrier. The physicochemical properties of the modified adsorbents were characterized using X-ray diffraction (XRD), differential thermogravimetry (DTG), Fourier-transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). The results indicate that, K2CO3 and PEI activate the porous structure of TiO2, enhancing the density of surface alkaline active sites. This enhancement facilitates the accommodation of PEI and K2CO3, exposes adsorption active sites, and promotes CO2 diffusion and CO2 adsorption. 50%PEI@TiO2 introduces numerous active functional groups and alkaline amine sites, achieving a CO2 adsorption capacity of 2.11 mmol/g. By measuring the CO2 adsorption by 50%PEI@TiO2 adsorbent and fitting to Langmuir and Freundlich adsorption isotherm models, it finds that CO2 is mainly adsorbed physically, and van der Waals force plays a major role during adsorption. The optimal adsorption and desorption temperatures for CO2 are 50 ℃ and 110 ℃, respectively. The cyclic experiment showed that, compared with PEI, K2CO3-loaded adsorbents exhibit greater stability, with a decrease in adsorption capacity of less than 10% after 30 cycles. These findings suggest that functionalized materials based on commercial SCR catalyst TiO2 pellets hold promise for low-temperature CO2 capture in industry flue gases.

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利用不同质量的K2CO3和PEI将TiO2表面功能化并深入研究CO2的吸附性能和机理;通过超声浸渍法,以K2CO3和聚乙烯亚胺(PEI)为功能化材料,以商用选择性催化还原(SCR)催化剂白胚(多孔型TiO2)为载体成功制备CO2低温吸附剂;利用XRD、DTG、FTIR和XPS表征测试改性吸附剂的理化特性。结果表明:K2CO3和PEI可活化多孔型TiO2孔隙结构,并提高表面碱性活性中心的密度,不仅有助于提升PEI和K2CO3的容纳能力,还有利于吸附活性位点的暴露以及CO2的扩散与吸附;PEI负载可引入大量活性官能团和碱性胺位点,对CO2的吸附容量可达2.11 mmol/g。通过测量50%PEI@TiO2吸附剂对CO2的吸附量以及Langmuir、Freundlich吸附等温线模型的拟合发现,CO2以物理吸附为主,吸附时范德华力起主要作用;CO2最佳吸、脱附温度分别为50 ℃和110 ℃。循环实验表明,与PEI相比,K2CO3负载TiO2更稳定,30次循环后CO2吸附容量下降不超过10%,表明以商用SCR催化剂白胚为载体的功能化材料有望应用于烟气CO2低温捕集。

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周长松(1990),男,博士,副教授,主要研究方向为烟气多污染物协同脱除技术,
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雷嗣远(1984),男,硕士,主要研究方向为烟气碳捕集技术,

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雷嗣远(1984),男,硕士,主要研究方向为烟气碳捕集技术,

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雷嗣远(1984),男,硕士,主要研究方向为烟气碳捕集技术,

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figureFileBig=se9OOKoO7L/DAIZikXoxlg==, tableContent=null), ArticleFig(id=1236390486999618401, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236345969705545951, language=CN, label=图12, caption=改性多孔型TiO2对CO2的循环吸脱附性能, figureFileSmall=IhERAHZUOpFnVNjRG3I8Wg==, figureFileBig=se9OOKoO7L/DAIZikXoxlg==, tableContent=null), ArticleFig(id=1236390487104476004, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236345969705545951, language=EN, label=Tab.1, caption=

Specific surface area and pore structure analysis of modified porous TiO2

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吸附剂种类BET比表面积/(m2·g–1)平均孔径/nm平均孔容积/ (cm3·g–1)
TiO287.4517.310.292 3
40% KC@TiO261.6317.070.240 7
50% KC@TiO240.1918.250.219 2
40%PEI@TiO272.5717.340.255 9
50%PEI@TiO250.3617.920.226 0
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改性多孔型TiO2的比表面积与孔结构分析

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吸附剂种类BET比表面积/(m2·g–1)平均孔径/nm平均孔容积/ (cm3·g–1)
TiO287.4517.310.292 3
40% KC@TiO261.6317.070.240 7
50% KC@TiO240.1918.250.219 2
40%PEI@TiO272.5717.340.255 9
50%PEI@TiO250.3617.920.226 0
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Fitting parameters of CO2 adsorption isotherm model

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模型R2参数
Langmuir0.919qm=111.89,KL=0.002 89
Freundlich0.997n=2.13,Kf=7.275 00
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CO2吸附等温线模型拟合参数

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模型R2参数
Langmuir0.919qm=111.89,KL=0.002 89
Freundlich0.997n=2.13,Kf=7.275 00
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K2CO3/聚乙烯亚胺功能化多孔型TiO2及CO2捕集性能研究
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雷嗣远 1 , 王思源 1 , 何川 1 , 张伟 2 , 王乐乐 1 , 汪华 2 , 刘鹏 1 , 陈宝康 1 , 周长松 3
热力发电 | 碳捕集技术创新与工艺优化 2025,54(6): 90-96
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热力发电 | 碳捕集技术创新与工艺优化 2025, 54(6): 90-96
K2CO3/聚乙烯亚胺功能化多孔型TiO2及CO2捕集性能研究
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雷嗣远1 , 王思源1, 何川1, 张伟2, 王乐乐1, 汪华2, 刘鹏1, 陈宝康1, 周长松3
作者信息
  • 1.西安热工研究院有限公司苏州分公司,江苏 苏州 215153
  • 2.华能重庆两江燃机发电有限责任公司,重庆 401120
  • 3.南京师范大学能源与机械工程学院,江苏 南京 210023
  • 雷嗣远(1984),男,硕士,主要研究方向为烟气碳捕集技术,

通讯作者:

周长松(1990),男,博士,副教授,主要研究方向为烟气多污染物协同脱除技术,
Study on K2CO3/PEI functionalized porous TiO2 and CO2 capture performance
Siyuan LEI1 , Siyuan WANG1, Chuan HE1, Wei ZHANG2, Lele WANG1, Hua WANG2, Peng LIU1, Baokang CHEN1, Changsong ZHOU3
Affiliations
  • 1.Xi’an Thermal Power Research Institute Co., Ltd. Suzhou Branch, Suzhou 215153, China
  • 2.Huaneng Chongqing Liangjiang Gas Turbine Power Generation Co., Ltd., Chongqing 401120, China
  • 3.School of Energy and Mechanical Engineering, Nanjing Normal University, Nanjing 210023, China
出版时间: 2025-06-25 doi: 10.19666/j.rlfd.202412190
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利用不同质量的K2CO3和PEI将TiO2表面功能化并深入研究CO2的吸附性能和机理;通过超声浸渍法,以K2CO3和聚乙烯亚胺(PEI)为功能化材料,以商用选择性催化还原(SCR)催化剂白胚(多孔型TiO2)为载体成功制备CO2低温吸附剂;利用XRD、DTG、FTIR和XPS表征测试改性吸附剂的理化特性。结果表明:K2CO3和PEI可活化多孔型TiO2孔隙结构,并提高表面碱性活性中心的密度,不仅有助于提升PEI和K2CO3的容纳能力,还有利于吸附活性位点的暴露以及CO2的扩散与吸附;PEI负载可引入大量活性官能团和碱性胺位点,对CO2的吸附容量可达2.11 mmol/g。通过测量50%PEI@TiO2吸附剂对CO2的吸附量以及Langmuir、Freundlich吸附等温线模型的拟合发现,CO2以物理吸附为主,吸附时范德华力起主要作用;CO2最佳吸、脱附温度分别为50 ℃和110 ℃。循环实验表明,与PEI相比,K2CO3负载TiO2更稳定,30次循环后CO2吸附容量下降不超过10%,表明以商用SCR催化剂白胚为载体的功能化材料有望应用于烟气CO2低温捕集。

碳捕集  /  低温吸附  /  功能化  /  TiO2载体  /  循环利用

The TiO2 surface is functionalized with different concentrations of K2CO3 and polyethyleneimine (PEI), and in-depth research on CO2 adsorption performance and mechanism is conducted. CO2 low-temperature adsorbent was successfully prepared by ultrasonic impregnation method using K2CO3 and PEI as functionalized materials and commercial selective catalytic reduction (SCR) catalyst white embryo (porous TiO2) as carrier. The physicochemical properties of the modified adsorbents were characterized using X-ray diffraction (XRD), differential thermogravimetry (DTG), Fourier-transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). The results indicate that, K2CO3 and PEI activate the porous structure of TiO2, enhancing the density of surface alkaline active sites. This enhancement facilitates the accommodation of PEI and K2CO3, exposes adsorption active sites, and promotes CO2 diffusion and CO2 adsorption. 50%PEI@TiO2 introduces numerous active functional groups and alkaline amine sites, achieving a CO2 adsorption capacity of 2.11 mmol/g. By measuring the CO2 adsorption by 50%PEI@TiO2 adsorbent and fitting to Langmuir and Freundlich adsorption isotherm models, it finds that CO2 is mainly adsorbed physically, and van der Waals force plays a major role during adsorption. The optimal adsorption and desorption temperatures for CO2 are 50 ℃ and 110 ℃, respectively. The cyclic experiment showed that, compared with PEI, K2CO3-loaded adsorbents exhibit greater stability, with a decrease in adsorption capacity of less than 10% after 30 cycles. These findings suggest that functionalized materials based on commercial SCR catalyst TiO2 pellets hold promise for low-temperature CO2 capture in industry flue gases.

carbon capture  /  low temperature adsorption  /  functionalization  /  TiO2 carrier  /  recycling utilization
雷嗣远, 王思源, 何川, 张伟, 王乐乐, 汪华, 刘鹏, 陈宝康, 周长松. K2CO3/聚乙烯亚胺功能化多孔型TiO2及CO2捕集性能研究. 热力发电, 2025 , 54 (6) : 90 -96 . DOI: 10.19666/j.rlfd.202412190
Siyuan LEI, Siyuan WANG, Chuan HE, Wei ZHANG, Lele WANG, Hua WANG, Peng LIU, Baokang CHEN, Changsong ZHOU. Study on K2CO3/PEI functionalized porous TiO2 and CO2 capture performance[J]. Thermal Power Generation, 2025 , 54 (6) : 90 -96 . DOI: 10.19666/j.rlfd.202412190
目前,主要的燃烧后碳捕集技术包括化学吸收法[1]、高温固碳法[2]和低温吸附法[3]。其中,低温吸附法可使用固体吸附剂(如沸石、多孔炭)在较低温度(<60 ℃)下吸附CO2[4]。刘天祥等[5]将四乙烯五胺负载在MCM-41沸石上进行新型改性,研究载体结构、吸附温度等因素对CO2吸附性能的影响。雷苏等[6]利用挤压-滚圆法制备Na2CO3吸附剂并测试其对CO2的低温吸附性能,发现低温吸附法具有较低的能耗和成本,未来发展空间广阔。
传统的低温吸附剂载体因具有不同结晶形态和结构稳定性,机械强度和吸附性能差别较大。未添加钒、钨等催化活性组分的选择性催化还原(SCR)脱硝催化剂白胚(多孔型TiO2)具有丰富的多孔结构和良好的机械强度,作为吸附剂载体预期有良好的表现。可通过改性多孔型TiO2引入特定功能,如酸或碱性位点,从而增强其对特定污染物的吸附选择性[7-9]。黄彪等[10]利用多孔型TiO2微粒作为吸附剂对染料进行吸附处理。陆洋等[11]利用浸渍法将CeO2负载在TiO2表面并用于提高燃煤烟气中汞的吸附容量。
K2CO3和聚乙烯亚胺(PEI)作为CO2吸附剂,在环境温度和压力下表现出优异的CO2吸附性能,并具有低成本和较强的再生能力[12-14]。目前,将K2CO3和PEI负载于多孔型TiO2表面并用于工业烟气中,CO2的吸附脱除尚未见报道。因此,利用不同质量的K2CO3和PEI将TiO2表面功能化,并深入研究其CO2的吸附性能和机理,可为商用SCR脱硝催化剂白胚用于烟气捕集CO2提供新思路和技术支持。
本研究采用的多孔型TiO2载体为Dongfang KWH生产的SCR催化剂白胚,分析纯级K2CO3为西安天茂化工有限公司生产,氨水溶液(NH3·H2O质量分数25%)和无水乙醇由上海麦克林生化科技股份有限公司生产,分析纯级PEI为阿拉丁化学试剂有限公司生产。
CO2吸附性能测试在自制固定床实验装置(图1)上进行。模拟烟气由一定比例的N2(80%)、水蒸气(10%)和CO2(10%)在混气瓶中混合,N2和CO2的总流量由质量流量计控制在1.8 L/min。水蒸气含量由水浴锅调节鼓泡器的温度进行控制。
实验开始前,将2 g改性多孔型TiO2的CO2吸附剂放入固定床内,吸附后的气体经冷凝后通入CO2分析仪中在线监测,吸附性能计算公式为:
qa=Q×ρCO2ma×MCO2×0t(CinCout1Cout)×dt
式中:qa为吸附剂CO2吸附量,mmol/g;Q为混合气体流量,L/min;ρCO2为CO2密度,kg/cm3ma为吸附剂质量,g;MCO2为CO2摩尔质量,g/mol;t为吸附时间,s;Cin为CO2初始体积分数,%;Cout为CO2吸附后的出口体积分数,%。
采用超声浸渍法制备改性TiO2吸附剂,将TiO2固体粉末置于氨水溶液以去除TiO2空隙中的酸性杂质,处理后加入无水乙醇中,在40 ℃下搅拌30 min;称取不同质量的K2CO3加入上述混合物中,超声浸渍2 h,然后将上述混合物在80 ℃下真空干燥12 h,即制得不同负载量(即K2CO3占吸附剂混合物的质量分数分别为40%、50%,下同)K2CO3功能化的TiO2吸附剂,分别记为40%KC@TiO2和50%KC@TiO2。称取不同质量的PEI加入上述混合物中,超声浸渍2 h,然后将上述混合物在80 ℃下真空干燥12 h,即制得不同负载量(即PEI占吸附剂混合物的质量分数分别为40%、50%,下同)PEI功能化的TiO2吸附剂,分别记为40%PEI@TiO2和50%PEI@TiO2
利用扫描电子显微镜(JSM-5610LV,日本)、X射线能量色散光谱仪(Apreo 2S,美国)、全自动表面积分析仪(Micromeritics ASAP2460,美国)、傅里叶变换红外光谱仪(FTIR,IS50,美国)、X射线衍射仪(XRD,Rigaku Ultima IV,日本)、X射线光电子能谱仪(XPS,PHI 5000 Versaprobe,日本)、热重分析仪(Pyris 1 TGA,美国,30~800 ℃,10 ℃/min)测试样品的理化性质。
为了揭示改性多孔性TiO2的微观结构,对改性吸附剂进行放大8万倍的电镜扫描,加速电压20 kV,WD=6.4 mm,Signal A=SE2,结果如图2所示。改性后的吸附剂样品颗粒物呈现为多孔疏松状[15]表1为改性多孔型TiO2的比表面积与孔结构分析。负载K2CO3或PEI后的TiO2比表面积随着负载量的增大而减少,平均孔径变化不大,平均孔容有所减小。这主要原因为K2CO3和PEI本身并非多孔材料,而其负载后大部分选择性地沉积在大孔、介孔中,小部分沉积在微孔孔道内,堵塞了部分微孔,使得平均孔径变化不大但比表面积和孔容减小。改性前后多孔性TiO2的孔径主要分布在介孔(2~50 nm)范围内,有利于功能化物质粘附于通道内并保持孔道通畅,同时可提供用于吸附的活性位点场所。
通过比较改性前、后多孔型TiO2的XRD衍射图谱(图3,其中2θ∈10°~90°,扫描速度8°/min,Cu、Ka辐射长度0.154 nm)发现,所有吸附剂均显示出锐钛矿TiO2的晶体衍射峰(JCPDS card no. 21-1272),故改性后吸附剂载体晶相并未发生改变。除了50%KC@TiO2在2θ=45°、52°处存在杂峰,其他衍射峰的形态在改性前、后基本保持不变。主要原因为K2CO3负载后在TiO2黏膜层不均匀增厚而形成了钾基沉积[16]
改性多孔型TiO2的红外光谱表征如图4所示。相比TiO2位于2 900、1 500 cm–1的吸收峰,K2CO3负载TiO2增加了位于471、1 086、1 681 cm–1的吸收峰,而PEI负载TiO2增加了位于458、1 086、3 431 cm–1的吸收峰。其中,1 086 cm–1处的强吸收峰可归属于C=O拉伸振动引起[17]。471 cm–1处的吸收峰可归属于O-H的平面外弯曲振动引起[18]。证实了改性后多孔型TiO2上含氧官能团的存在,且–C=O和–OH的出现表明多孔型TiO2在活化过程中因加羰基化和羟基化使得表面碱性活性位点增加,从而具有更强的CO2吸附性能。图5为50% KC@TiO2吸附剂表面氧元素能谱图,射线源为Al靶Kα射线,能量为1 486 eV。可以看出,吸附剂表面结合氧同时包含C=O和–OH形态氧,这与红外光谱分析相符[19-20]
改性多孔型TiO2的热重分析DTG分析如图6所示。
测试气氛为N2,升温速率10 ℃/min。对于未改性TiO2,其在1 000 ℃以内的质量损失可以忽略不计,表明该材料具有优异的热稳定性,适合用作吸附剂载体。在130 ℃以内,吸附剂有1个微弱的失重峰,其质量降低约10%,这主要是由于预吸附的水和CO2的挥发[21]。在130~350 ℃,K2CO3和PEI负载后的吸附剂出现明显的失重峰,失重率仅为1.2~1.5%/min,主要为K2CO3和PEI在吸附剂中的挥发和分解造成,且PEI的分解温度略高于K2CO3[22]。此外,在CO2吸附和脱附温度范围内(30~120 ℃),吸附剂没有明显的分解,表明制备的吸附剂亦具有良好的热稳定性。
改性多孔型TiO2对CO2吸附容量曲线如图7所示。与未改性TiO2相比,负载K2CO3和PEI后的吸附剂对CO2吸附容量均有明显提升。这主要归功于K2CO3和PEI活化了TiO2载体孔隙结构,促进了CO2扩散,并提高了表面碱性活性中心的密度,从而增强了其与CO2的结合力[23]。负载K2CO3和PEI后,TiO2表面孔隙被活性组分填充,孔隙减小,孔径接近CO2的动力学直径,更有利于CO2在孔道中的扩散和吸附。实验结果表明,随着负载K2CO3和PEI负载量增多,与其发生反应的CO2随之增多。相同活性物质负载量情况下,PEI可提供更多的碱性胺位点,具有更大的CO2吸附容量,可达2.11 mmol/g,优于钾钠基负载Al2O3或分子筛吸附剂(最佳条件下CO2吸附容量仅为0.15~1.65 mmol/g),有效提升了CO2吸附性能[6,24-25]
研究温度对CO2的吸附影响,结果如图8所示。由图8可见:随着温度的升高,4种吸附剂对CO2的吸附量呈现先增后减的趋势;在50 ℃时,吸附容量达到最大。低温下CO2吸附过程受到动力学控制,随着温度升高,CO2扩散能力增强,吸附速率加快。PEI负载吸附剂尤为明显,这是由于PEI的黏度随着温度升高而减小,有利于暴露更多碱性胺位点。然而,随着温度进一步升高至80 ℃,尽管有更多的胺活性位点可用,但由于CO2吸附过程中大量放热,高温开始抑制反应,导致CO2吸附能力降低。此外,低温环境下适合吸附CO2的微孔孔径随温度升高而增大,进而减少了吸附CO2的微孔数量,导致吸附能力降低。
研究了不同SO2体积分数对CO2的吸附影响,结果如图9所示。由图9可见,烟气中SO2的存在会拟制CO2吸附,且SO2体积分数越高,CO2的吸附容量下降越明显。这主要是因为酸性更强的SO2气体和CO2存在竞争吸附。郭百合等[26]研究发现,与CO2分子相比,SO2分子中的S原子外s轨道电子更加活跃,使得p轨道及O原子轨道外电子活性均有所增强,与吸附剂表面活性O原子外轨道能带重叠,导致SO2会优先吸附在吸附剂表面的O顶位,并将CO2分子推离吸附剂表面。
CO2吸附后的脱附性能是评价吸附剂是否适合工业推广应用的重要指标。因此,以50%PEI@TiO2吸附剂为例在90~130 ℃进行脱附实验,结果如图10所示。由图10可见:尽管在100 ℃下CO2可以在25 min左右完成脱附,但脱附速率较为缓慢;随着温度升至110 ℃,CO2的脱附速率显著加快,可在8 min内完成脱附。随着温度进一步升高,虽然CO2的脱附速率加快,但活性物质的挥发或分解损失也随之增加,不利于长期循环使用,因此最佳脱附温度在110 ℃左右。
为了反映CO2分子与吸附剂表面之间的相互作用强度和吸附平衡的情况,以50%PEI@TiO2为例在不同进气体积分数条件下(3%~10%)测试吸附剂对CO2的吸附量,在此基础上对吸附剂进行Langmuir、Freundlich吸附等温线模型的拟合,确定用于描述该体系吸附行为的适当模型,从而评估吸附材料对CO2的吸附选择性[27-28],结果如图11所示。
Langmuir吸附等温方程主要适用于吸附剂表面均匀的单分子层吸附过程,而Freundlich吸附等温方程主要适用于不均匀吸附剂表面的非理想吸附过程。方程的数学表达式为:
qe=qmKLC1+KLC
qe=KFC1n
式中:qe为平衡吸附量;qm为单分子层饱和吸附量;C为被吸附气体的平衡CO2体积分数;KL为Langmuir常数,是吸附物质在固体表面上的吸附能力的度量;KF为Freundlich常数,也可认为是相对吸附容量;n为代表吸附剂吸附强度的常数。
表2为CO2吸附等温线模型拟合参数。从表2可以看出,Freundlich方程的拟合效果(R2=0.997)优于Langmuir方程的拟合效果(R2=0.919),说明在此吸附过程中吸附剂表面为不均匀的非理想吸附过程,而非仅为单分子层吸附过程[29]。从Freundlich模型拟合出的参数值可以看出,n值为2.13,研究认为当n>1.0时有利于吸附。此外,n还可以作为吸附线性偏差的1个度量,用于验证吸附类型,一般认为当n等于1.0时为线性吸附过程,n大于1.0时为物理吸附过程,n小于1.0时为化学吸附过程[30]。CO2以物理吸附为主,吸附时起主要作用的为范德华力,而非化学键力[31]
为了更准确地评价改性多孔型TiO2吸附剂,分别在50 ℃吸附温度和110 ℃脱附温度下对50%KC@TiO2和50%PEI@TiO2吸附剂进行吸附CO2的多次循环稳定性测试,结果如图12所示。
图12可见:第1、2次循环时2种吸附剂对CO2的吸附容量与初始吸附容量相比均有所下降,这是由于CO2的不完全脱附所致;50%KC@TiO2的吸附容量更加稳定,30次循环后吸附容量下降不超过10%,表明K2CO3负载吸附剂具有理想的循环吸附稳定性。22次循环后PEI负载TiO2对CO2的吸附性能开始低于K2CO3负载TiO2,这主要是由于活性胺的黏度较弱,相对于K2CO3多次循环后的更易从载体剥离脱落。
1)相较于K2CO3,PEI可提供更多的碱性胺位点,因此具有更大的CO2吸附容量,可达2.11 mmol/g。改性多孔型TiO2对CO2的最佳吸脱附温度分别为50 ℃和110 ℃。
2)循环实验发现,相较于PEI, K2CO3负载吸附剂的吸附性能更稳定,30次循环后吸附容量下降不超过10%,表明以商用SCR催化剂白胚为载体的CO2吸附剂具有理想的循环稳定性和良好的应用前景。
  • 国家重点研发计划项目(2023YFB4104000)
  • 西安热工研究院有限公司院自立科技项目(GU-23-TYK20)
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2025年第54卷第6期
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doi: 10.19666/j.rlfd.202412190
  • 首发时间:2026-03-05
  • 出版时间:2025-06-25
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  • 修回日期:2024-12-05
基金
National Key Research and Development Program of China(2023YFB4104000)
国家重点研发计划项目(2023YFB4104000)
Science and Technology Project of Xi’an Thermal Power Research Institute Co., Ltd.(GU-23-TYK20)
西安热工研究院有限公司院自立科技项目(GU-23-TYK20)
作者信息
    1.西安热工研究院有限公司苏州分公司,江苏 苏州 215153
    2.华能重庆两江燃机发电有限责任公司,重庆 401120
    3.南京师范大学能源与机械工程学院,江苏 南京 210023

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周长松(1990),男,博士,副教授,主要研究方向为烟气多污染物协同脱除技术,
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2种不同金属材料的力学参数

Family
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genus
种数
Number of
species
占总种数比例
Percentage of
total species (%)

Genus
种数
Number of
species
占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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