MATERIALS LETTERS
·
2015
·
IF 2.489
Zong-Qun Li,Ji-Chao Yang,Ke-Wen Sui,Na Yin
Metal-organic framework Zr 6 O 4 (OH) 4 (BTC) 2 (HCOO) 6 (MOF-808) nanoparticles were successfully synthesized with a household microwave oven in less than 5 min of irradiation time. The obtained MOF-808 nanoparticles exhibited high superacidity, making them excellent adsorbent for arsenic removal. The adsorption capacity of the as-synthesized MOF-808 nanoparticles for arsenic was 24.83 mg/g. Furthermore, the adsorbents still maintained 82.10% of the removal efficiency after five cycles, indicating that the MOF-808 nanoparticles can serve as a regenerable As(V) adsorbent.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2020
·
IF 7.183
Lili Liu,Yangyang Pu,Yao Lu,Na Li,Zhaoxia Hu,Shouwen Chen
Towards the breaking of the “trade-off” between proton conductivity and stabilities of sulfonated poly(aryl ether sulfone) (SPAES)-based proton exchange membranes, a strategy of compositing with the superacids of sulfated SnO 2 (ST) and SnO 2 -xCeO 2 (CSTx) is designed and carried out. The superacids of ST and CSTx have been synthesized by sulfonation of SnO 2 with sulfuric acid and subsequently doped with CeO 2 . By the solution casting approach, the composite membranes are obtained in a homogenous state and show excellent mechanical strength , thermal, dimensional and chemical stability. ST or CSTx in the composite membranes provides excess active sites and forms additional proton-conducting channels by a network of hydrogen bonds . Although with low IEC levels, all the composite membranes show larger water absorption and proton conductivity than the control SPAES membrane. As a result, the SPAES-2CST3 membrane achieves a power output of 673.6 mW/cm 2 at 80 °C, which is higher than the control membrane (481.8 mW/cm 2 ). The durability of the SPAES-2CST3 membrane under accelerated stress test conditions is significantly enhanced compared to the control SPAES membrane, and the aged SPAES-2CST3 membrane exhibits lower hydrogen crossover and better cell performance than the aged control SPAES membrane.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
Advanced Sustainable Systems
·
2020
·Vol. 4
·期 10
·1900136
·
IF 4.869
Xing Zhang,Hui Yan,Lingjun Zhu,Tian Li,Shurong Wang
The monomers and dimers produced via lignin depolymerization are a promising alternative to transportation fuels after hydrodeoxygenation (HDO). However, these compounds contain numerous oxygen-containing functional groups that are strongly bonded to aromatic rings. Therefore, the conventional HDO of lignin-derived compounds faces serious problems of catalyst deactivation due to coke deposition and low hydrocarbon yields. A metal–solid super acid catalyst, i.e., Ru(SO 4 2− )/ZrO 2 –CeO 2 , is synthesized, characterized, and evaluated for the HDO of various lignin-derived monomers and dimers in a biphasic n -dodecane/H 2 O system. A high cyclohexane yield of 98.5% is obtained by the HDO of phenol performed at 200 °C and 5 MPa. The “hydrated” configuration can be formed between the hydrogenation intermediates and H 2 O on the Ru sites. In addition, the anionic vacancies of ZrO 2 –CeO 2 can be occupied by H − derived from the heterolytic cleavage of H 2 , leading to the formation of metal hydrides. The strong acidity of SO 4 2− /ZrO 2 –CeO 2 is beneficial for the subsequent deoxygenation of the hydrotreated products. In addition, the biphasic system can minimize the side reactions induced by the strong acidity of the catalyst. The catalytic system also exhibits a good catalytic performance for the HDO of other lignin-derived monomers and dimers to produce cycloalkanes.
研究领域:
化学工程
·
催化科学
✓ 已验证
DOI
高影响因子
Micro & Nano Letters
·
2016
·Vol. 11
·期 2
·86-90
·
IF 0.723
Yiguang Li,Xueliang Liu,Xiaohong Li,Zhijun Zhang,Mengyun Zhao,Changming Su
Sulphated titania superacid (denoted as SO 4 2− /TiO 2 ) and sulphated zirconia-doped titania superacid (denoted as SO 4 2− /ZrO 2 /TiO 2 ) were prepared via a liquid-phase in-situ method. As-prepared SO 4 2− /TiO 2 and SO 4 2− /ZrO 2 /TiO 2 superacids were characterised by transmission electron microscopy, field emission scanning electron microscopy, X-ray diffraction and Fourier transform infrared spectrometry. Moreover, the catalytic performance of SO 4 2− /TiO 2 and SO 4 2− /ZrO 2 /TiO 2 for the aquathermolysis reaction and viscosity reduction of the extra-heavy oil recovered at Shengli Oilfield (Dongying, China) was investigated. It was found that SO 4 2− /TiO 2 and SO 4 2− /ZrO 2 /TiO 2 as the catalysts for the aquathermolysis process of the tested extra-heavy oil have good catalytic performance. Saturated hydrocarbon, aromatic hydrocarbon, resin and asphalt composition of the tested heavy oil sample before and after aquathermolysis reaction indicates that the amount of the saturated hydrocarbon and aromatic hydrocarbon are increased, while the amount of resin and asphalt are decreased, showing promising potential in the industrial production of heavy crude oil.
研究领域:
化学工程
·
石油工程
·
催化材料
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2021
·
IF 4.43
Ziqin Li,Riming Yu,Chang Liu,Jifu Zheng,Jing Guo,Tauqir A. Sherazi,Shenghai Li,Suobo Zhang
The poly(aryl ether ketone) with spatial cardo structure is prepared from 4,4′-bis(phenoxy)benzophenone and 1-(4-bromobutyl)indoline-2,3-dione through a facile polyhydroxyalkylation reaction catalyzed by superacid . The number average molecular weight of the resultant polymer is achieved as high as 105.6 kg mmol −1 . Three anion exchange membranes were prepared by reacting the polymer with trimethylamine , N-methyl-piperidine, and N,N,N′,N′,N″-pentaethylguanidine, respectively. Among the prepared membranes, N-methyl-piperidine based anion exchange membrane exhibited the highest OH − conductivity of 99.8 mS cm −1 at corresponding IEC of 1.54 meq g −1 . In addition, the prepared membranes also exhibit excellent mechanical properties , in which the tensile strength and elongation at break can reach up to 50 MPa and 35%, respectively. Moreover, the anion exchange membranes exhibited good alkaline stability. When they were treated with 1 M KOH at 60 °C for 600 h, their conductivity decreased by less than 5%.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2021
·
IF 7.033
Qingpo Peng,Xiuge Zhao,Difan Li,Manyu Chen,Xinjia Wei,Jian Fang,Kai Cui,Yuan Ma,Zhenshan Hou
The heterogeneous heteropolyacid-catalyzed acetalization of glycerol with acetone was investigated under solvent-free conditions. In this work, the calcined Ta/W mixed addenda heteropolyacid catalyst ({H 20 }-355) was employed as a solid acid catalyst and showed much higher activity than these soluble Keggin-type catalysts in the acetalization of glycerol with acetone due to its superacidity ( H 0 = −12.95). Meanwhile, it showed high stability in catalytic recycles and extended for acetalization of glycerol with the other aldehydes and ketones . Based on the catalyst characterization by X-ray diffraction (XRD), scanning electron microscopy (SEM), 31 P NMR spectra, FT-IR spectra, pyridine-absorbed FT-IR, and Hammett acidity functions ( H 0 ) by UV–vis spectroscopy, it was found that the acidic strength of the Ta/W mixed addenda heteropolyacid was highly dependent on the contents of crystalline water that could be tuned by calcination temperature. Notably, the solid superacid catalyst {H 20 }-355 was swollen by acetone, exhibiting an interesting “pseudo-liquid” behavior, which served as a microreactor and facilitated the reaction. Furthermore, after the acetalization reaction of glycerol with furfural (98% yield of acetal) on {H 20 }-355 catalyst, the furan ring of the acetal products can be hydrogenated sequentially into dioxolane or dioxane with Pd/C catalyst under room temperature condition without the need of any isolation procedure.
研究领域:
化学工程
·
催化科学
·
可再生燃料合成
✓ 已验证
产品关联
DOI
高影响因子
Energy Technology
·
2021
·Vol. 9
·期 11
·2100595
·
IF 3.631
Rongjiang Wen,Huihui Huang,Juanyong Wan,Shuangchun Wen,Jinzhao Wang,Xi Fan
Strong acid treatment is regarded as the most effective approach to increase the electrical conductivity of poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonate) (PEDOT:PSS) electrodes. However, the conventional soaking treatments of strong acids have drawbacks, including limited flexibility of PEDOT:PSS electrodes coated on thermoplastic underlying substrates, high preparation cost with large acid consumption, and moderate stability of flexible organic solar cells (OSCs). Herein, a unique and cost-effective fumigation treatment using trifluoromethanesulfonic acid (CF 3 SO 3 H) vapors is proposed. The CF 3 SO 3 H fumigation treatment leads to a highly conductive, smooth, homogeneous, and flexible PEDOT:PSS electrode. On the basis of the CF 3 SO 3 H-fumigated PEDOT:PSS electrodes, the inverted flexible OSCs yield a high power conversion efficiency (PCE) of 13.62%. Moreover, the flexible solar cells maintain most (≈91%) of the initial efficiency in long-term storage. This work provides a novel route to make solution-processed flexible OSCs simultaneously have a high PCE and good storage stability.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2016
·Vol. 33
·期 8
·2478-2485
·
IF 1.408
Zhou Lihua,Niu Yu,Yang Jinbei,Li Chenggang,Guo Xiaoting,Li Ling,Qiu Ting
Sulfated titania (SO
2− 4
/TiO 2 ) was prepared and characterized by nitrogen adsorption-desorption, FT-IR, thermostability analyzer, XRD and particle size analyzer. The esterification of myristic acid (MA) with isopropanol (IPOH) catalyzed by the solid super acid SO
2− 4
/TiO 2 was studied. The effect of reaction kinetics conditions such as temperature, stirrer speed, initial mole ratio of alcohol to acid, and catalyst loading on the conversion of myristic acid was investigated. A second-order pseudo-homogeneous model was developed to calculate the rate of the reaction, and then the kinetic parameters were estimated. The calculated values were in agreement with experimental data.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
ChemCatChem
·
2019
·Vol. 12
·期 5
·1376-1384
·
IF 4.495
Wen-Di Guo,Lei Liu,Shu-Qing Yang,Xiao-Chao Chen,Yong Lu,Giang VO-Thanh,Ye Liu
Graphical Synergetic catalysis : The one-pot tandem bis-alkoxycarbonylation of alkynes was accomplished over the bi-functional catalytic system containing Xantphos-modified Pd-complex and Lewis super-acid of Al(OTf) 3 . Via the synergetic catalysis, the involved Xantphos-modified Pd-complex was responsible for the activation of CO and the alkynes through coordination to Pd-center while Al(OTf) 3 was in charge of the activation of the alcohol to facilitate the formation of [Pd−H] + active species. Tandem bis-alkoxycarbonylation of alkynes allows for the preparation of 2-substituted succinates from alkynes and nucleophile alcohol via two successive alkoxycarbonylation with advantages of 100 % atomic economy and simplified one-pot operation. Herein, the one-pot tandem bis-alkoxycarbonylation of alkynes was accomplished over the bi-functional catalytic system containing Xantphos-modified Pd-complex and Lewis super-acid of Al(OTf) 3 . It was found that, via the synergetic catalysis, the involved Xantphos-modified Pd-complex was responsible for the activation of CO and the alkynes through coordination to Pd-center while Al(OTf) 3 was in charge of the activation of the alcohol to facilitate the formation of [Pd−H] + active species. The in situ high-pressure FT-IR analysis, coupled with 1 H/ 13 C NMR spectral characterizations, confirmed that the introduced Al(OTf) 3 with intensive oxophilicity (via acid-base pair interaction) was able to activate nucleophilic MeOH to be a reliable proton-donor ( i. e . hydride-source) to warrant the formation and stability of [Pd−H] + species upon the oxidation of Pd 0 by H + (Pd 0 +H + →[Pd II −H] + ). Over the developed bi-functional catalytic system, the yields of the target diesters were obtained in the range of 36∼86 % in this sequence with the wide substrate scope.
研究领域:
有机化学
·
催化化学
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2022
·
IF 3.898
Yaoyao Peng,Lei Song,Siru Lu,Ziyu Su,Kui Ma,Siyang Tang,Shan Zhong,Hairong Yue,Bin Liang
The significant decrease of acid sites caused by alkali metal poisoning is the major factor in the deactivation of commercial V 2 O 5 -WO 3 /TiO 2 NH 3 -SCR catalysts. In this work, the solid superacid SO 4 2− -TiO 2 modified by sulfate radicals, was selected as the catalyst support, which showed superior potassium resistance. The physicochemical properties and K-poisoning resistance of the V 2 O 5 -WO 3 /SO 4 2− -TiO 2 (VWSTi) catalyst were carried out by XRD, BET, H 2 -TPR, NH 3 -TPD, XPS, in situ DRIFTS and TG. The results pointed out that the introduction of SO 4 2− significantly increased the NH 3 -SCR catalytic activity at high temperatures, with an exceptionally high NO x conversion over 90% between 275 °C and 500 °C. When 0.5% (mass) K 2 O was doped on the catalysts, the catalytic performance of the traditional V 2 O 5 -WO 3 /TiO 2 (VWTi) catalyst decreased significantly, while the VWSTi catalyst could still maintain a NO x conversion over 90% in the range of 300–500 °C. The characterizations suggested that the support of SO 4 2− -TiO 2 greatly increased the number of acidic sites, thereby enhancing the adsorption capacity of the reactant NH 3 . The results above demonstrated a potential approach to achieve superior potassium resistance for NH 3 -SCR catalysts using solid superacid.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Lili Gong,Zhili Cai,Can Wang,Ju Bai,Linglong Shan,Xianghai Meng,King Lun Yeung,Haitao Zhang,Zhichang Liu,Shuangjiang Luo
Superacid-catalyzed polymers of intrinsic microporosity have attracted increasing attention in membrane-mediated gas separation due to their good processability, facile polymerization procedure, and tunable microporosity and gas separation performance. In this study, we synthesized a series of new superacid-catalyzed polymers with fully ladder backbones and well-defined micropores using a one-pot condensation polymerization. The incorporation of a contorted spirobisindane building block facilitated the formation of highly microporous structures in the resulting polymers, enhancing their intrinsic microporosity and gas separation properties. Among the three SACPs, SACP-PhMe exhibited the largest d-spacing value, specific surface area, and pore volume due to its bulkiest side group. The gas separation performance of the SACP membranes surpassed several benchmark polymer membranes, with the SACP-PhMe membrane demonstrating excellent performance in separating CO2/CH4, H2/CH4, O2/N2, and H2/N2. The SACP-Me membrane exhibited the lowest porosity, making it less susceptible to CO2 absorption and showing superior plasticization resistance. The results highlight the promising gas separation properties of the SACPs and their potential for various gas separation applications, offering new opportunities for advanced polymer membrane design.
研究领域:
材料科学
·
化学工程
·
膜技术
✓ 已验证
产品关联
DOI
高影响因子
ChemCatChem
·
2022
·Vol. 14
·期 10
·e202200001
·
IF 5.497
Helong Sun,Lufa Hu,Zhangyang Li,Junyu Lang,Chunling Wang,Xiaohao Liu,Yun Hang Hu,Fangming Jin
Graphical POMs : SiW 12 O x /TiO 2 was demonstrated as an ultra-stable heterogeneous catalyst with tailored molecular interfacial structure and super acidity for photocatalytic oxidation of methane to formic acid. This fabrication method could be relevant for other type POMs based photocatalyst, which provide a way to fabricate ultra-stable molecular interface photo-catalyst with highly efficiency. The interface and surface acidity of heterogeneous catalysts are widely applied to manipulate the catalytic performance. However, the interface structure prepared by traditional synthesis processes required multistep procedures, which was still lack of controllability and stability. Here, we show a general synthetic approach to fabricate ultra-stable heterogeneous catalysts with tailored molecular interfacial structure and super acidity in one step. The as-synthesized SiW 12 O x /TiO 2 catalyst was used for photo-catalytic conversion of methane to value-added oxygenates. We propose that the formed molecular interface W 12 −OH−Ti coupled with the introduced Brønsted acid sites of POMs, results in enhancing the photocatalytic performance. Namely, the addition of SiW 12 O x can reduce the recombination of electrons and holes for triggering charge separation owing to the photoelectron capturing by proton, improving electron transfer to reactants and thereby promoting catalytic activity. This fabrication method provides a way to build molecular interface photo-catalyst by POMs with super acidity and ultra-stable structure.
研究领域:
催化化学
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）