Journal of CO2 Utilization
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2017
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IF 4.292
Tianze Xie,Jianyang Wang,Fanshu Ding,Anfeng Zhang,Wenhui Li,Xinwen Guo,Chunshan Song
The effect of support pore size of FeK/Al 2 O 3 catalysts on the catalytic performance in CO 2 hydrogenation reaction was investigated. A total of 8 iron-based catalysts supported on alumina with different pore size were prepared by incipient wetness impregnation where the amount of Fe and K were fixed at 15 and 10 wt%, respectively. N 2 adsorption/desorption, XRD, TPR and PZC were used to characterize the supports and catalysts. The results show that the support pore size impacts the size of Fe 2 O 3 particles formed in the catalyst; increasing pore size of Al 2 O 3 supports led to increased size of Fe 2 O 3 particles formed in the pores. Catalyst pore sizes of 7–10 nm and the corresponding Fe 2 O 3 particle sizes of 5–8 nm were the most active for CO 2 hydrogenation to hydrocarbons. Outside this range, larger pore size further decrease the iron dispersion and reduce the number of active sites; smaller pore size is not favorable on account of the too small Fe 2 O 3 particle sizes and lower reducibility of the small particle.
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ISIJ INTERNATIONAL
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2017
·Vol. 57
·期 1
·62-67
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IF 1.11
Zijian Su,Yuanbo Zhang,Yingming Chen,Guanghui Li,Tao Jiang
A considerable amount of works were focused on the formation mechanism of calcium ferrite phases during the iron ore sintering process, especially under various O2 content atmospheres at temperatures higher than 1100°C. But little attention has been paid on reactions between CaO and iron oxides in CO–CO2 atmospheres at lower temperatures. In this study, the solid state reaction mechanisms between CaO and Fe3O4 under CO–CO2 atmospheres at 800°C–1100°C were revealed by using XRD, VSM, etc. The results indicated that Ca2Fe2O5 was easily formed under 5–50 vol% CO/(CO+CO2) atmosphere above 850°C via the reaction of 6CaO + 2Fe3O4 +CO2 = 3Ca2Fe2O5 + CO and the reaction would be promoted with increasing the roasting temperature. In the CO–CO2 atmosphere, Fe3O4 is easily oxidized to Fe2O3 in the presence of CaO because CO2 components act as oxidative medium for the oxidation of Fe2+ to Fe3+.
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International Journal of Greenhouse Gas Control
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2016
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IF 4.064
Shufeng Shen,Yangyang Bian,Yue Zhao
High energy consumption for aqueous amine-based CO 2 capture process is still a major drawback limiting its commercial deployment. Most of heat is used for water vaporization during solvent regeneration for CO 2 stripping. Development of phase-changing solvents is an attractive energy-efficient method to reduce energy requirement. In this work, we have proposed potassium prolinate (ProK)/ethanol solution as a novel non-aqueous absorbent. Its physical properties and the rate of CO 2 absorption were investigated and compared with the aqueous ProK systems. Phase behaviours during CO 2 absorption and partition of CO 2 absorbed between liquid and solid phases were characterized. The main species in solid precipitates were identified as bicarbonate and proline salts by 13 C NMR and XRD. Moreover, the regenerated absorbents can remain relatively stable after absorption-desorption cycles.
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ELECTROCHEMISTRY COMMUNICATIONS
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2016
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IF 4.569
Zheng Xia,Wenze Qiu,Han Bao,Bin Yang,Lecheng Lei,Zhikang Xu,Zhongjian Li
A novel solid polymer electrolyte was developed by co-deposition of catechol (CCh) and polyethyleneimine (PEI) on a polypropylene membrane for electrochemical reduction of CO 2 (ERC) in gas phase. ERC performance was both investigated in a gas-gas mode and a gas-liquid mode. The maximum CO production rate was 121 μmol/h and the faradaic efficiency was 51% in the gas-liquid mode, which were much higher than those obtained with AM-7001 under the same condition. The high loading rate of quaternary ammonium ions on the membrane and the large surface area provided by the porous nano-structure of the membrane contribute to the high ERC efficiency. Furthermore, the cost of the CCh/PEI-Q membrane was much lower than commercial Nafion membranes, endowing this novel composite SPE with great potential in industrial application.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2016
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IF 8.328
Min Jiang,Yilin Gao,Zhaoyu Wang,Zhengxin Ding
Spinel CuCo 2 O 4 nanoplates were synthesized through a solvothermal method coupled with a calcination treatment in air. The prepared CuCo 2 O 4 samples were fully characterized by diverse physical and chemical techniques including powder X-ray diffraction (XRD), field emission scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS) and N 2 sorption measurement. The CuCo 2 O 4 material was developed as an efficient, low-cost and stable cocatalyst to boost photochemical CO 2 conversion with Ru(bpy) 3 2+ as a homogeneous photosensetizer. The catalytic performance of the CuCo 2 O 4 samples was evaluated toward visible-light-driven deoxygenative reduction of CO 2 to CO under mild conditions. Various parameters of the reaction system and the synthesis conditions of CuCo 2 O 4 were investigated and optimized to maximize the catalytic performance of CO 2 reduction system. The stability and the reusability of the CuCo 2 O 4 cocatalyst were examined. Moreover, the CuCo 2 O 4 cocatalyst was further proved to be highly active to promote CO 2 photoreduction catalysed by CdS semiconductor as a heterogeneous light harvester, and markedly reinforced photocatalytic CO 2 reduction performance was achieved.
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MATERIALS & DESIGN
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2016
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IF 3.997
Haipeng Bai,Yaping Zheng,Ruilu Yang
Six kinds of liquid-like trisilanol isobutyl-POSS derivatives are designed and synthesized to study the influences of their structures on capturing CO 2 . The derivatives are different in bonding types, NH content, flow ability, grafting ratio or molecular size. The CO 2 capture property of these derivatives is tested. It is found that bonding types can affect the recycle property, NH content can affect the chemical absorption , molecular size can affect the physical adsorption, and flow ability can affect both chemical absorption and physical adsorption. Furthermore, the physical adsorption is determining factor that cause differences from liquid-like derivatives to traditional amine based solvents CO 2 absorbents.
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APPLIED SURFACE SCIENCE
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2016
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IF 3.15
Zezhou Zhu,Jiani Qin,Min Jiang,Zhengxin Ding,Yidong Hou
Photocatalytic reduction of carbon dioxide can convert chemically inert carbon dioxide into useful chemical fuel in a mild manner. Herein, Ag-CdS nanocomposites were prepared by photodeposition method and examined for photocatalytic CO 2 reduction under visible light. Meanwhile, the nanocomposites were characterized by XRD, SEM, TEM, XPS, DRS and PL in detail. The results show that, the deposition of Ag improves the photocatalytic performance of CdS, especially in the selectivity of CO 2 -to-CO. The highest photocatalytic activity is achieved over 1.0 wt.% Ag/CdS, with an increase by 3 times in comparison to CdS. In this reaction system, Ag can serve as electron trap as well as active site for CO 2 reduction, which is probably responsible for the enhanced activity and selectivity of CO 2 to CO over Ag/CdS. The possible mechanism of CO 2 photoreduction over Ag/CdS was proposed in view of the abovementioned analysis.
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MATERIALS RESEARCH BULLETIN
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2017
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IF 2.446
Aisheng Huang,Linlin Wan,Jürgen Caro
In a detailed study, the influence of microwave irradiation, synthesis time and temperature, addition of acetic acid (HAc) as a modulator on the morphology, crystallinity and stability of UiO-66-NH 2 is investigated to develop a reliable and reproducible strategy for the preparation of well-shaped UiO-66-NH 2 . The UiO-66-NH 2 were characterized by powder X-ray diffraction (PXRD), field emission scanning electron microscopy (FESEM), thermogravimetric analysis (TGA), and gas adsorption. It is found that well-shaped UiO-66-NH 2 with a high CO 2 adsorption capacity can be synthesized in a short time by microwave heating. The UiO-66-NH 2 crystals synthesized by microwave heating are of high quality and show a superior CO 2 adsorption capacity (5.8 mmol/g at 273k and 1 bar) due to the strong interactions between the −NH 2 group and CO 2 . The CO 2 /N 2 selectivity of the obtained UiO-66-NH 2 at 298 K and 1 bar is 66, which is much higher than that of the pristine UiO-66 of 17.8.
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JOURNAL OF MEMBRANE SCIENCE
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2015
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IF 5.056
Yifan Li,Xueqin Li,Hong Wu,Qingping Xin,Shaofei Wang,Ye Liu,Zhizhang Tian,Tiantian Zhou,Zhongyi Jiang,Hongwei Tian,Xingzhong Cao,Baoyi Wang
Calcium lignosulfonate (CaLS) is an organic anionic surfactant , which has been used for the first time as a charged additive to improve the performance of Pebax membranes for CO 2 separation. Owing to the abundant hydrophobic groups and low charge density of lignosulfonate ion (LS 2− ), CaLS was found to efficiently interrupt the chain packing of Pebax 1657 matrix via both metal-organic complexation and hydrophobic interaction, endowing membranes with tunable fractional free volume (FFV). For dry membranes, CaLS could slightly enlarge membrane FFV without forming highly crosslinked structures. For humidified membranes, water-induced swelling led to a remarkable enhancement of FFV, while the hydrophobic interaction between CaLS and Pebax avoided excessive swelling. With the coexistence of CaLS and water, optimal FFV and moderate salting-out effect were acquired, resulting in very high CO 2 permeability (3585 Barrer) and fairly good CO 2 /gas selectivity (29 for CO 2 /CH 4 and 71 for CO 2 /N 2 ). The separation mechanism was discussed by analyzing the relationship between salting-out effect and the well-known solution-diffusion mechanism. Based on the performance comparison of Pebax–CaLS membrane with the previously reported Pebax–salt membranes, the guideline about the design of polymer electrolyte membranes for CO 2 capture was tentatively proposed.
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JOURNAL OF MEMBRANE SCIENCE
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2014
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IF 4.908
Alsamani A.M. Salih,Chunhai Yi,Hailing Peng,Bolun Yang,Lijuan Yin,Wei Wang
Polyether based thin film composite (TFC) membranes were developed by interfacial polymerization (IP) on polysuylfone (PSf) ultra-filtration membrane with poly (dimethylsiloxane) (PDMS) inter-layer. Polyetheramine (PEA) and Trimesoyl Chloride (TMC) were selected as aqueous monomer and organic monomer, respectively. The thickness of the PDMS inter-layer was 550 nm, while IP separation layer was only 100 nm. The effects of the PDMS inter-layer and the PEA molecular weight on the TFC membrane performance were investigated. The gas permeation results show that the TFC membrane with PDMS inter-layer exhibits higher CO 2 /N 2 selectivity compared to the membranes without PDMS inter-layer. PDMS inter-layer is able to eliminate the defects on the support membrane and diminish the TMC hydrolysis as well. Among the membranes prepared with three different molecular weight PEAs (ED-600, ED-900 and ED-2003), the membrane of ED-900 exhibits the best performance with an impressive CO 2 permeance of 360 GPU and CO 2 /N 2 selectivity of 67.2 for a mixture CO 2 /N 2 (20/80 by volume), while for a mixture of CO 2 /CH 4 (10/90 by volume) it demonstrates CO 2 permeance of 275 GPU and CO 2 /CH 4 selectivity of 31.6.
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ENERGY & FUELS
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2015
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IF 2.79
Pengcheng Hu,Rui Zhang,Zhichang Liu,Haiyan Liu,Chunming Xu,Xianghai Meng,Meng Liang,Shuangshuang Liang
Several amine-based ionic liquids (ILs) were synthesized via a one-step method using low-priced organic amines and inorganic acids, and they were mixed with water to form new CO2 absorbents. The effects of the ionic structure, IL concentration, temperature, and pressure on the CO2 absorption performance were investigated. The absorption performance of ILs was closely related to the ionic structure, and the CO2 molar absorption capacity in ILs with the same cation followed the order of [NO3] > [BF4] > [SO4] or [HSO4], whereas that with the same anion ranked in the following order: multiple amine > diamine > monoamine. The IL [TETA][NO3] with 40 wt % concentration showed the best capacity for CO2 absorption. Moreover, low temperature and high pressure favored CO2 absorption. The reaction mechanism of the amine group with CO2 in aqueous solutions of [TETA][NO3], primary amine, and secondary amine was studied via in situ infrared (IR) spectrophotometry. The results showed that the primary and secondary amines first reacted with CO2 to form carbamate, which decomposed further into bicarbonate with the continuous addition of CO2. However, carbamate generated from the reaction of [TETA][NO3] with CO2 did not decompose further.
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RSC Advances
·
2013
·Vol. 4
·期 5
·2360-2367
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IF 2.562
Jin-Quan Wang,Wei-Guo Cheng,Jian Sun,Tian-Yuan Shi,Xiang-Ping Zhang,Suo-Jiang Zhang
Several novel 2-hydroxymethyl-functionalized ILs act as the catalysts for synthesis of cyclic carbonates from CO2 and epoxides without the use of any co-catalysts or organic solvent. Moreover, the 2-hydroxymethyl-functionalized ILs were compatible with base, which combined with K2CO3 were used as effective catalytic system for green synthesis of dimethyl carbonate from CO2via ethylene carbonate without catalyst separation. Additionally, the mechanistic details of the fixation of CO2 into cyclic carbonate catalyzed by 2-hydroxymethyl-functionalized ILs were also elucidated by density functional theory. The process reported here represents a simple, ecologically safer, cost-effective and energy-saving route to organic carbonates from CO2.
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危险品化学品经营许可证（带存储）