五乙烯六胺改性制备CO2吸附剂及其对模拟烟气中CO2捕集性能的研究（英文）

A novel solid support adsorbent for CO2 capture was developed by loading pentaethylenehexamine (PEHA) on commercial y available mesoporous molecular sieve MCM-41 using wet impregnation method. MCM-41 sam-ples before and after PEHA loading were characterized by X-ray powder diffraction, N2 adsorption/desorption, thermal gravimetric analysis and scanning electron microscope to investigate the textural and thermo-physical properties. CO2 adsorption performance was evaluated in a fixed bed adsorption system. Results indicated that the structure of MCM-41 was preserved after loading PEHA. Surface area and total pore volume of PEHA loaded MCM-41 decreased with the increase of loading. The working adsorption capacity of CO2 could be significantly improved at 60%of PEHA loading and 75 °C. The effect of the height of adsorbent bed was investigated and the best working adsorption capacity for MCM-41-PEHA-60 reached 165 mg·(g adsorbent)?1 at 75 °C. Adsorption/desorption circle showed that the CO2 working adsorption capacity of MCM-41-PEHA kept stable. ? 2014 The Chemical Industry and Engineering Society of China, and Chemical Industry Press. Al rights reserved.     

金属改性MCM-41对盐酸左氧氟沙星吸附研究

实验制备MCM-41及金属改性Al-MCM-41和Co-MCM-41,并作为吸附剂来处理废水中的盐酸左氧氟沙星.实验对吸附剂反应温度、pH、吸附剂投加量对废水中盐酸左氧氟沙星的吸附效率的影响进行了研究.根据实验结果,设计一款有效吸附废水中的盐酸左氧氟沙星吸附装置,该装置有望于应用于实际生产中,从而简化处理抗生素盐酸左氧...     

催化剂Au/CeO_2/MCM-41的制备及其活性研究

文章报道了一种新型催化剂Au/CeO2/MCM-41的制备,并对它的比表面积、晶体结构、表面元素价态、储释氧能力及催化活性进行表征。通过催化剂的活性测试,发现催化剂Au/CeO2/MCM-41对CO氧化具有很高的活性,但催化剂对煅烧温度比较敏感,随煅烧温度上升,催化活性下降很快,可能是因为一方面较高的温度煅烧使金纳米颗粒迅速长大,从而活性很快的下降;另一方面高温煅烧使催化剂发生烧结,从而比表面积下降引起活性的降低。     

金属有机骨架材料对单组分CO2吸附的研究进展

重点综述了近五年来MOFs材料在单组分CO₂吸附领域的最新研究进展,详细地介绍了近几年来被深入研究几种MOFs材料,主要按照国内外常用的IRMOFs、MILs、UiOs、ZIFs、其它系列等MOFs材料进行分类,从掺杂金属或氮原子、调节孔径、氨基功能化以及合成MOFs复合材料等方面,对其CO₂吸附性能和吸附机理进行了分析,展望了MOFs材料未来的发展方向,对MOFs提供了系统性理解,以期为MOFs材料应用到工程实践提供一定参考。     

一种内置MCM-41与金属改性物对抗生素污水吸附的蜂窝状装置

制备MCM-41及其金属改性物并用于处理污水中的抗生素,MCM-41对污水中的抗生素的吸附效能极佳,反应条件温和,可以通过金属改性提高吸附效能,MCM-41对水环境中抗生素的污染修复具有巨大的潜在应用价值。设计开发一种可以固定MCM-41和金属改良物的蜂窝状装置,将其应用于水环境的抗生素污水处理中,不仅简化处理抗生素污水过程,而且减少化学废弃物所带来的二次污染。     

粉煤灰合成中孔分子筛MCM-41及其吸附性能

以粉煤灰为初始原料,十六烷基三甲基溴化铵（CTAB）为模板剂采用水热法合成出中孔分子筛MCM-41,采用小角XRD、TEM、氮气吸附-脱附等对样品的物相、比表面积、孔径、孔体积等进行表征,并研究了样品分子筛对镍离子的吸附性能。结果表明：样品具有典型中孔分子筛MCM-41的特性,比表面积为576 m^2/g,平均孔径为5.53 nm;Ni^2＋能定量吸附在样品分子筛上,最大去除率可达到96%,吸附性能符合Langmuir吸附方程特征,并且随吸附液pH的增大,Ni^2＋去除率也随之增加。     

填料塔中AEE与MEA混胺对低浓度CO2的吸收

在常压下考察了体积分数20%乙醇胺（MEA）+2% N-甲基二乙醇胺（MDEA）与20%羟乙基乙二胺（AEE）+ 2% N-甲基二乙醇胺（MDEA）有机胺水溶液对CO2的吸收及解吸效果。考察了静态吸收和中试动态吸收实验。实验结果表明：在吸收温度及解吸温度相同的条件下,20%羟乙基乙二胺（AEE）+2% N-甲基二乙醇胺（MDEA）吸收剂对CO2的吸收及解吸效果要好于20%乙醇胺（MEA）+2% N-甲基二乙醇胺（MDEA）,而且不易降解。达到同样的解吸效果,20%羟乙基乙二胺（AEE）+2% N-甲基二乙醇胺（MDEA）吸收剂的能耗要低10%左右,具有较好的工业应用前景。     

生物炭基活性炭吸附CO2研究进展

近年来生物质废料作为制备活性炭的前驱体受到广泛关注,简单回顾了生物质活性炭的制备方法、影响因素、活性炭的改性试剂以及吸附CO₂的应用研究,最后对其未来的发展方向进行了展望。     

改性MCM-41分子筛的合成与亚甲基蓝吸附性能

选用TEOS（正硅酸乙酯）做为硅源,CTAB（十六烷基三甲基溴化铵）做为表面活性剂,在碱性条件下水热合成MCM-41。实验采用3-氨丙基三甲基硅烷对MCM-41进行改性,成功得到氨基改性介孔材料NH₂-MCM-41吸附剂,并使用X射线衍射（XRD）对其做了表征。考察了各种实验条件下,比如温度、吸附剂的量、pH、亚甲基蓝初始浓度等条件下MCM-41和NH₂-MCM-41对水溶液中亚甲基蓝（MB）的吸附能力。MCM-41和氨基改性介孔材料NH₂-MCM-41均为平面六方介孔结构。结果表明,温度和pH是影响MCM-41和NH₂-MCM-41对亚甲基蓝吸附的最主要的因素。随着温度的升高,材料吸附能力增强,而过高或者过低的pH都会降低MCM-41和NH₂-MCM-41对亚甲基蓝的吸附能力。     

多孔蜂窝活性炭材料对CO2吸附热力学研究

以4种不同品牌多孔蜂窝活性炭为研究对象,采用N₂物理吸附、扫描电镜SEM、透射电镜TEM和XRF等方法对活性炭物化结构进行了表征,探讨了不同品牌蜂窝活性炭材料的成分和孔隙结构对CO₂吸附的影响。并通过对比0,20,40℃下CO₂的吸附等温线,分析CO₂在不同蜂窝活性炭材料表面的吸附热力学特性,拟合出CO₂气体吸附量与等量吸附热之间的关系。结果表明：N₂和CO₂吸附等温线属于Ⅰ型吸附等温线,样品主要以微孔结构为主,存在少量介孔结构;不同温度下活性炭吸附CO₂曲线均符合Langmuir吸附模型;温度升高,CO₂在活性炭材料上的吸附量均减小,说明升温不利于CO₂在活性炭上的吸附;相同条件下,泰州800活性炭(TZ800)的吸附量高于淄博800活性炭(ZB800)的吸附量,表明CO₂更易吸附于TZ800活性炭上,这可能得益于其丰富和发达的微孔结构。同时TZ...     

PEI-MCM-41吸附剂的制备及其CO_2吸附性能研究

使用不同方法合成了MCM-41,制备出具有不同骨架结构和内部孔道结构的介孔分子筛。通过XRD、高倍投射电镜、低温氮吸附/脱附等方法对样品进行了表征分析。用PEI对MCM-41分子筛进行改性,然后使用热重方法测定了其对CO2的吸附量。结果表明,使用硅酸钠和硫酸为原料制备的样品具有较大的比表面积和孔容,在该样品上负载50%PEI吸附量达到了269.3 mg/g,是同等条件下单纯PEI吸附量的3.4倍。说明将PEI负载在具有大比表面积和孔容的MCM-41介孔分子筛上,可以使PEI得到充分分散,并充分利用PEI分子上的氨基。     

Cobalt oxide nanoparticles on mesoporous MCM-41 and Al-MCM-41 by supercritical CO2 deposition

CoO and Co₃O₄ nanoparticles were uniformly dispersed inside mesoporous MCM-41 and Al-MCM-41 supports using supercritical CO₂ reactive deposition. This method represents a one-pot reproducible procedure that allows the dissolution of the organocobalt precursor and supports impregnation in supercritical CO₂ at 70 °C and 110 bar, followed by the precursor thermal decomposition into cobalt species at 200 °C and 160 bar. By the relative concentration of the cobalt precursor [cobalt (II) bis (η⁵-ciclopentadienil)], the load of cobalt nanoparticles was controlled and then determined by Inductively Coupled Plasma (ICP-OES). The synthesis of CoO and Co₃O₄ species inside the MCM-41 and Al-MCM-41 substrates was confirmed by X-ray Photoelectron (XPS) and Laser Raman Spectroscopies (LRS). By N₂ adsorption and Small Angle X-ray Scattering (SAXS), it was determined that the hexagonal arrangement as well as the surface area and pore size of the substrates changed after the addition of cobalt. By means of X-ray mapping from SEM images, a homogeneous distribution of cobalt nanoparticles was observed inside the mesopores when the cobalt loading was 1 wt.%. In addition, spherical cobalt nanoparticles of average diameter close to 20 nm were detected on the outer surface of MCM-41 and Al-MCM-41 supports when the cobalt content was higher. On the other hand, by Transmission Electron Microscopy (TEM), it was possible to measure the interplanar distance of the crystalline plane of the outer nanoparticles, which was later compared with the theoretical distance values which allowed identifying the CoO and Co₃O₄ phases.     

The entrapment of UO2 in mesoporous MCM-41 and MCM-48 molecular sieves

A method based on direct template-ion-exchange was employed for the entrapment of UO₂²⁺ ions in MCM-41 and MCM-48 molecular sieves via swapping of cetyltrimethylammonium cations present in the mesoporous channels by the UO₂²⁺ ions in an aqueous solution. The samples were characterized by XRD, FT-IR, and ICP-AES techniques. The entrapment of UO₂²⁺ ions is facilitated by the large pore size vis-a-vis the high surfactant content in the as-synthesized host materials. A higher loading of UO₂²⁺ ions was achieved in MCM-48 as compared to MCM-41, which could be attributed to its three-dimensional pore system and higher surfactant-to-silica ratio. FT-IR results provide an evidence of a strong binding of UO₂²⁺ groups with the defect silica sites of mesoporous molecular sieves.     

的吸附与解吸研究进展

本文介绍了工业上CO₂的主要来源及应用,以及工业上分离、回收CO₂的常用方法。同时介绍了活性炭在变压吸附分离气体领域的应用,以及变压吸附过程中吸附剂再生的常用方法。详细综述了活性炭的孔结构、表面化学结构等因素对CO₂的吸附及解吸性能影响的研究进展。     

MgO/MCM-41对二氧化碳的吸/脱附性能的研究

采用等体积浸渍法制备MgO/MCM-41作为吸附剂,通过静态吸附法对其吸附性能进行了测定。结果表明,制得的吸附剂只存在一个碱性位,二氧化碳吸附后主要以碳酸氢盐的形式存在。当MgO的负载量为20%的时候,对二氧化碳的吸附量最大,在30℃条件下,其对二氧化碳的吸附量为46.6 mg/g。     

絮凝法制备TiO2/MCM-41复合光催化剂及其性能的研究

以MCM-41分子筛为介孔材料,采用絮凝法制备复合光催化剂,通过XRD对复合光催化剂的晶型结构和形貌进行了表征,以人工合成染料罗丹明B为降解对象,考察絮凝pH、煅烧时间、煅烧温度、光照时间、催化剂投加量对复合光催化剂活性的影响。实验结果表明：在絮凝pH值为4时所得絮凝污泥,经700℃煅烧2h后的复合光催化剂具有最佳的光催化活性,在紫外光下照射浓度为20mg/L的罗丹明B 40min可获得98%以上的降解效果。     

Mechanistic study on the SCR of NO by C3H6 over Pt/V/MCM-41

Pt/V/MCM-41 has a high activity for the selective catalytic reduction (SCR) of NO with C₃H₆ over a wide temperature range. Its broad activity–temperature window is due to three different reactions occurring in each different temperature range. One of these reactions is the reaction occurring on usual Pt-based catalysts. The experimental result of Pt dispersion effect suggested that this reaction follows the redox mechanism. The second reaction is that of molecularly adsorbed NO on Pt with surface carbonaceous species on Pt/V/MCM-41. Experiments for the reaction of NO with carbonaceous materials present on Pt/V/MCM-41 used in the SCR of NO confirmed that carbonaceous species can take part in the reaction. The third reaction is that occurring on support V/MCM-41.     

疏水性MCM-41分子模板剂对水中U(VI)的吸附性能试验研究

采用水热合成法制备了疏水性介孔二氧化硅材料(MCM-41-dry)并经煅烧制得亲水性介孔二氧化硅材料(MCM-41-cal).试验探讨了pH值、吸附时间、投加量以及U(VI)初始浓度等因素对MCM-41材料煅烧前后吸附U(VI)效果的影响,利用SEM、EDS、BET和FTIR分析其吸附机理.试验结果表明, MCM-41-dry材料因具有有机模板剂,其吸附效果远高于MCM-41-cal的吸附效果;当pH值为5,吸附时间为180 min,温度为30 ℃,MCM-41-dry投加量为0.2 g/L,U(VI)初始浓度为10 mg/L时,其对U(VI)的吸附率可达99.2%;Langmuir吸附等温模型和准二级动力学方程能较好的拟合其吸附过程,当T=303 K时,理论饱和吸附量为241.935 mg/g,吸附为单分子层吸附,以化学吸附为主.通过BET、FTIR表征则说明MCM-41-dry具有六方形介孔结构能吸附U(VI),官能团羟基和氨基发挥了很大的作用.