International Journal of Greenhouse Gas Control
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2015
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IF 3.946
Xia Wang,Qingjie Guo,Jun Zhao,Linlin Chen
A CO 2 sorbent was prepared by immobilizing a mixture of tetraethylenepentamine (TEPA) and 2-amino-2-methyl- l -propanol (AMP) onto MCM-41. The prepared composites were characterized by N 2 adsorption–desorption, Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), and thermogravimetric analysis (TGA) techniques. CO 2 adsorption–desorption experiments were conducted in a self-assembled fixed bed reactor under the simulated flue gas component of 15 vol.% CO 2 /85 vol.% N 2 . The promoting effects of AMP on the adsorption performance and amine efficiency of TEPA modified MCM-41 were studied. In addition, the effects of the adsorption temperature and the feed flow rate on the CO 2 adsorption process were investigated. Further, the regenerability of the sorbent was studied by performing fifteen adsorption–desorption cycles over the temperature range of 70 °C (adsorption) to 100 °C (desorption). Among the prepared sorbents, MCM-41 modified with 30 wt.% TEPA and 30 wt.% AMP (MCM-41-TEPA30%-AMP30%) showed rapid adsorption kinetics and the maximum CO 2 adsorption capacity of 3.01 mmol-CO 2 /g-sorbent at 70 °C. Moreover, the MCM-41-TEPA30%-AMP30% sorbent exhibited good regenerability and thermal stability. The results demonstrate that the MCM-41-TEPA30%-AMP30% sorbent is a promising CO 2 sorbent.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
POWDER TECHNOLOGY
·
2013
·
IF 2.024
Dewen He,Cancheng Bai,Chongwen Jiang,Tao Zhou
Titanium containing MCM-41 is synthesized hydrothermally in the presence of structure-directing agent cetyltrimethylammonium bromide (CTAB). Bi- and tri-metal Fe and Zn are impregnated in these materials to improve the acid catalytic sites as well. XRD , BET nitrogen adsorption isotherm, TEM and SEM analysis confirm the presence of mesopores in the composite. The local environment of titanium incorporated into the mesoporous silicate material is investigated by FT-IR and UV–Vis spectroscopy. These results indicate the presence of active centers within the composite material Ti, Fe and Zn. The new composite materials are preliminarily tested in the hydrolysis of cellulose . All the titanium MCM-41 materials improve the conversion of cellulose, providing higher catalytic activity in hydrolysis. There is maximum sugar and 5-HMF concentration resulted from hydrolysis of cellulose with Fe/Ti-MCM-41 catalyst.
研究领域:
材料科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
Desalination and Water Treatment
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2024
·
IF 1
Zhoubing Cheng,Qunpeng Cheng
ABSTRACT In this study, the performance of modified MCM-41 adsorbents by impregnation and grafting modification with 3-aminopropyltriethoxysilane (APTS) and polyethyleneimine (PEI) on the CO 2 adsorption was investigated. The results showed that the synergistic effect of APTS and PEI could improve the adsorption performance and thermal stability of the MCM-41 adsorbents. The CO 2 adsorption capacity of mixed amine-modified MCM-41 adsorbents was higher than single amine modified MCM-41 adsorbents. The maximum adsorption capacity (2.6512 mmol g –1 ) was obtained at MCM-41-APTS-5%-PEI-50%. Meanwhile, the adsorbents modified by mixed amine showed good cycle regeneration stability after five times of CO 2 adsorption/desorption cycling.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
RSC Advances
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2015
·Vol. 5
·期 89
·73083-73090
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IF 3.84
Kuiyi You,Renjie Deng,Jian Jian,Pingle Liu,Qiuhong Ai,He’an Luo
Developing a new environmentally friendly process for benzene nitration to nitrobenzene has been highly desirable for a long time. In this work, NO2 was used as a nitration agent to replace traditional nitric acid, and different mesoporous SiO2 and their supported heteropoly acid (salt) were employed to catalyze benzene nitration to nitrobenzene. Several typical catalysts were characterized using XRD, BET and FT-IR, and the acid amounts of the various catalysts were determined. The effects of various factors such as different catalysts, the molar ratio of benzene to NO2, reaction temperature, reaction time, HPW loading, the acid amounts of the catalyst and the reuse of the catalyst on the nitration reaction have also been systematically examined. The results indicate that the supported HPW/MCM-41 catalysts exhibit a remarkably synergistic catalytic performance on the nitration reaction of benzene to nitrobenzene. In particular, the 50%HPW/MCM-41 catalyst gives the best results with 73.4% benzene conversion and 98.8% selectivity to nitrobenzene under the optimal reaction conditions. Moreover, the mesoporous structure of MCM-41 was retained under the high loading of HPW. The possible reaction mechanism for the nitration reaction of benzene with NO2 over HPW/MCM-41 is suggested in the present work. This method provides a promising strategy for the preparation of nitro-aromatic compounds from a catalytic nitration reaction by using NO2 as the nitration reagent.
研究领域:
化学工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL TECHNOLOGY
·
2021
·
IF 3.247
Wenwen Huang,Jiacheng Liu,Na Rao,Guozhi Fan,Juntao Yan,Qunpeng Cheng,Guangsen Song
Concerning the increasing greenhouse effect, the development of efficient CO2 adsorbents is very important. In this study, the influence of surfactant on the adsorption performance of amine-functionalized MCM-41 was analysed. The results showed that the residual amount of surfactant in MCM-41 was gradually decreased with the increase of calcination temperature which improved the pore structure. The maximum adsorption capacity (5.495 mmol/g) appeared at PEI-MCM-41-100°C indicated that the adsorption capacity could be improved under the function of surfactant. By calculating the diffusion coefficient of CO2 adsorption process in PEI-MCM-41-100/200/300/400/550°C, the diffusion resistance of CO2 was the lowest in PEI-MCM-41-100°C, which directly proved that the synergism of surfactant and organic amine could reduce the diffusion resistance of CO2 in the pore.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
Science of Advanced Materials
·
2020
·Vol. 12
·期 2
·304-311
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IF 1.117
Xu Gaofeng,Jia Chengxinzhuo,Shi Zhengjun,Liang Ruijuan,Wu Chunhua,Liu Hu,Yan Chao,Fan Jincheng,Hou Hua,Ding Tao,Guo Zhanhu
The ex-situ catalytic cracking of camelina oil using nickel loaded MCM-41 as catalyst at 450 °C in fixed bed reactor was studied. Results revealed that the yield, selectivity and chemical composition of the liquid products was improved by nickel loaded MCM-41 without affecting
the crystalline structure of MCM-41. Moreover, the loaded nickel onto MCM-41 facilitated the cyclization, alkylation, aromatization, deoxygenation, isomerization and cracking reactions.
研究领域:
化学工程
·
能源科学
✓ 已验证
DOI
高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
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2019
·Vol. 30
·期 5
·1483-1489
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IF 1.637
Xiaogang Liu,Yuwen Cheng,Xiu Wang,Minglei Tian,Xiancai Li,Yifeng Yang
Using 3-chloropropyltriethoxysilane as an anchor, the functional monomer linear polyethylenimine(PEI) was grafted on the surface of mesoporous MCM-41. La 3+ was selected as the template ion and epichlorohydrin was used as the crosslinker. A lanthanum ion MCM-41 imprinted polymer (La(III)-IIP-PEI/MCM-41) was prepared, and a non-ion-imprinted polymer (NIP-PEI/MCM-41) was arranged in the same manner. The La 3+ surface imprinted polymer was characterized by means of infrared spectrometer, thermogravimetric(TG) analyzer, and scanning electron microscope(SEM). The optimal adsorption conditions and selective adsorption properties of La(III)-IIP-PEI/MCM-41 for La 3+ were determined by static adsorption method and adsorption performance. Experiments show that the maximum adsorption capacity of La(III)-IIP-PEI/MCM-41 can reach 212.69 mg g 1 . Adsorption equilibrium can be reached at 30 min. Quasi-second-order kinetic model can be used to describe its adsorption mechanism. La(III)-IIP-PEI/MCM-41 also has a strong selectivity for La 3+ .
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
Molecular Catalysis
·
2020
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IF 3.687
Yangyang Fang,Jun Li,Na Sheng,Xiaozhong Wang,Di Chen,Menglu Cai,Yu An,Yingqi Chen,Liyan Dai
A series of MoW-doped MCM-41 catalysts were prepared for the selective oxidation of anthracene to high value-added anthraquinone. Although anthraquinone production has been progressively industrialized, the anthracene oxidation still faces the problems of poor solubility of reactants and low anthracene conversion, particularly when employing supported catalysts in solution media. We herein reported a challenging but crucial method for anthraquinone production by using anthracene, H 2 O 2 and Mo 1 W 2 -MCM-41 catalyst in HOAc under mild reaction conditions. In addition, experimental and theoretical results revealed that the synergistic effect between Mo, W and MCM-41 species contributes to an enchanced cataltic activity with conversion up to 97.6 %. The highly active H 2 O 2 -MCM-41 catalyst can be used for several cycles without obvious activity loss and serve as a promising candidate for anthraquinone as well as its derivatives production, making it a good alternative for various oxidation reactions.
研究领域:
化学工程
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催化材料科学
✓ 已验证
DOI
高影响因子
Royal Society Open Science
·
2019
·Vol. 6
·期 7
·
IF 2.515
Yifang Li,Dandan Yan,Yanhui Wu
Because of the preferential butanol selectivity of some ionic liquids (ILs), an increasing amount of research has appeared regarding their application in butanol separation. In this research, two ionic liquids, namely, 1-ethyl-3-vinylimidazolium bis[(trifluoromethyl)sulfonyl]imide ([EVIM][Tf2N], IL1) and N-octyl-pyridinium bis[(trifluoromethyl)sulfonyl]imide ([OMPY][Tf2N], IL2), were applied to modify a mesoporous molecular sieve MCM-41. The IL-modified MCM-41 samples were characterized by XPS, BET, XRD, SEM and TEM. The ionic liquid-modified MCM-41 was incorporated into the polymer PEBA to prepare mixed matrix membranes to study the influences of the filling of IL-modified MCM-41 and operating conditions on the performance of the mixed matrix membrane for butanol pervaporation. The results indicated that the pervaporation performance of the PEBA membrane was enhanced by the incorporation of IL-modified MCM-41. When the temperature of the feeding liquid was 35°C and the mass fraction of butanol was 2.5 wt%, the 5% MCM-41-IL2-PEBA membrane showed a permeation flux of 421.7 g m−2 h−1 and a separation factor of 25.4. The permeation flux and the separation factor of the membrane increased as the temperature of the feeding liquid increased. The results of the long-period experiment suggested that the 5% MCM-41-IL2-PEBA membrane exhibited high stability within 100 h of operation.
研究领域:
化学工程
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材料科学
✓ 已验证
DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 5
·1006
·
IF 4.2
Xia Wang,Wulan Zeng,Peidan Hu,Shengxin Liu,Yuechao Lin,Zhaowen He,Chunling Xin,Xiangjun Kong,Jinghan Xu
Organic amine-modified mesoporous carriers are considered potential CO2sorbents, in which the CO2adsorption performance was limited by the agglomeration and volatility of liquid amines. In this study, four additives of ether compounds were separately coimpregnated with polyethylene polyamine (PEPA) into MCM-41 to prepare the composite chemisorbents for CO2adsorption. The textural pore properties, surface functional groups and elemental contents of N for MCM-41 before and after functionalization were characterized; the effects of the type and amount of additives, adsorption temperature and influent velocity on CO2adsorption were investigated; the amine efficiency was calculated; and the adsorption kinetics and regeneration for the optimized sorbent were studied. For 40 wt.% PEPA-loaded MCM-41, the CO2adsorption capacity and amine efficiency at 60 °C were 1.34 mmol/g and 0.18 mol CO2/mol N, when the influent velocity of the simulated flue gas was 30 mL/min, which reached 1.81 mmol/g and 0.23 mol CO2/mol N after coimpregnating 10 wt.% of 2-propoxyethanol (1E). The maximum adsorption capacity of 2.16 mmol/g appeared when the influent velocity of the simulated flue gas was 20 mL/min. In addition, the additive of 1E improved the regeneration and kinetics of PEPA-loaded MCM-41, and the CO2adsorption process showed multiple adsorption routes.
研究领域:
化学工程
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Shuo Li,Linghui Wang,Peng Lu,Yanshuo Li,Ya Li,Yajuan Wang,Lihui Yao,Dan Qiu
Water contamination resulting from the presence of the various coexistent pollutants is an urgent environmental challenge, and effective treatment is demanded to remove the toxic substances. The removal of pollutants by adsorption, as an effective, efficient and economic strategy, has been widely used in water treatment. In this work, PEI@MCM-41 was prepared by infiltrating polyethyleneimine (PEI) into the pores of mesoporous MCM-41, and applied for the removal of heavy metal ions. The adsorption kinetics of Cu 2+ , Ni 2+ and Cd 2+ by PEI@MCM-41 were supposed to be pseudo-second-ordered, and the adsorption capacities were as high as 39.30, 33.67 and 21.10 mg·g −1 , respectively. The influence of temperature, pH, coexistent salt and heavy metal ions concentration on the adsorption performance was studied. Owing to the nanoconfinement effect and hydrogen bond, PEI remained stable during the adsorption and desorption process, and the adsorption capacity for Cu 2+ maintained 84.15 % even after four consecutive adsorption–desorption cycles. This work demonstrates that the potential practical applicability of PEI@MCM-41 as promising adsorbent in the removal of heavy metal ions.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Yangyu Liu,Chunquan Li,Arman Peyravi,Zhiming Sun,Guangxin Zhang,Keivan Rahmani,Shuilin Zheng,Zaher Hashisho
Mesoporous silica MCM-41 was synthesized by a facile hydrothermal treatment using sodium silicate extracted from natural Opoka as the Si source. The dynamic adsorption and desorption of organic vapors mixture on the MCM-41 were investigated. Characterization of the textural properties of the samples showed that the sample synthesized with a molar ratio of CTAB/Si = 0.16 possessed the largest specific surface area (988 m 2 /g) and pore volume (1.02 cm 3 /g), also uniform pore size distribution centered at 2.8 nm. The adsorption capacity of this sample for organic vapors mixture improved remarkably over raw Opoka and reached 158.5 mg/g at 20 ℃, which is comparable to that of commercial activated carbon. The reusability of the adsorbent was tested by 5 adsorption and regeneration cycles. Obtained results demonstrate that the MCM-41 adsorbent can be easily regenerated by thermal desorption in air, and the cumulative heel on the adsorbent can be markedly reduced by increasing the desorption temperature, making it a promising adsorbent for VOCs abatement.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）