ENERGY & FUELS
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2018
·
IF 3.024
Fengqin Yin,Haozhen Ou,Shuoyu Wang,Linzhou Zhuang,Zhejia Wu,Shuixia Chen
A series of mesoporous amino resins (MA) with pore diameters of 2.82 to 9.87 nm have been successfully synthesized at low temperature using poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (P123) as surfactant template via HCl catalyzed sol–gel reactions of melamine and paraformaldehyde, followed by ethanol extraction. The mesoporous amino resin MA-P123–3.5 g, prepared at optimal condition by adding 3.5 g P123 as surfactant template, had higher specific surface area of 706.7 m2/g and larger pore size of 9.87 nm. After impregnating with polyethylenimine (PEI), the obtained MA-P123–3.5 g-PEI showed the highest CO2 uptakes of 4.68 mmol/g and amine utilization efficiency of 51.48% at 40 °C, which is higher than the theoretical amine utilization efficiency (35%). The kinetics studies implied that the Avrami model could better describe the CO2 adsorption process on the MA-PEI adsorbent, indicating the synergistic effect of chemical and physical adsorption mechanisms. The further analysis of CO2 diffusion model implied that the porous structure of MA is beneficial to the diffusion of CO2 in the particles. Due to the positive influence to the amine groups of the larger pore diameter in the accessibility and diffusion process, the MA samples impregnated with PEI also showed good regeneration stability after 10 cycles of CO2 adsorption–desorption. These results are helpful for developing high-performance CO2 adsorbents.
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JOURNAL OF MEMBRANE SCIENCE
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2018
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IF 6.578
Xiong-Fei Zhang,Yi Feng,Zhongguo Wang,Mingmin Jia,Jianfeng Yao
Incorporating metal-organic frameworks into cellulose matrix to prepare composite membranes is promising in gas-separation applications. In this study, UiO-66-NH 2 (Zr-based MOF) nanoparticles are wrapped into the densely packed cellulose nanofibrils (CNF-COOH) via a facile vacuum filtration process. The existence of acid-base interactions and electrostatic forces between UiO-66-NH 2 and CNF-COOH renders ideal interfacial morphology. Results show that UiO-66-NH 2 is cross-linked by -COOH groups and well-dispersed in the CNF matrix. The porous UiO-66-NH 2 strengthens the diffusion process of CO 2 molecules, thus elevating the permeation flux and separation factor simultaneously. The optimum separation performance is achieved over CM-1 membrane with a CO 2 permeability of 139 Barrer and a CO 2 /N 2 selectivity ratio of 46.
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FUEL PROCESSING TECHNOLOGY
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2019
·
IF 4.507
Ke Wang,Youwei Zhao,Peter T. Clough,Pengfei Zhao,Edward J. Anthony
Structurally modified and improved NaBr-co-doped Li 4 SiO 4 ceramics were developed for CO 2 absorption in low-CO 2 -concentration atmospheres. Pure and NaCl-doped Li 4 SiO 4 ceramics were also prepared for comparison. The samples were analyzed by X-ray diffraction, Scanning Electron Microscopy, N 2 adsorption, X-ray photoelectron spectroscopy, differential scanning calorimetry , and thermogravimetric analyses (dynamic and isothermal). The sorption kinetics were obtained using a double exponential model. The results showed that both Na and Br can be introduced into the Li 4 SiO 4 structure and doped on Li and oxygen sites, respectively. The doped sample presented a Li 2 O-enriched surface, guaranteeing abundant Li O sites and are significantly different from previous anionic (CO 3 , F and Cl) doping of Li 4 SiO 4 , Br doping also generated macroporous features with small particle size, these favorable characteristics promoted the surface chemisorption kinetics. Moreover, DSC analysis confirmed the formation of the molten phases during CO 2 absorption, which helps improve the lithium diffusion kinetics . Here, 0.1 mol NaBr doping was used to reach a maximum absorption capacity (>30.0 wt%) in 15 vol% CO 2, suggesting that NaBr-doped Li 4 SiO 4 ceramics have great potential for CO 2 capture at high temperature.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2019
·
IF 6.361
Ge Gao,Zhi Zhu,Jia Zheng,Zhi Liu,Qiu Wang,Yongsheng Yan
The two-dimensional (2D) ultrathin Mg-Al layered double hydroxide modified by magnetic Fe 3 O 4 (Fe 3 O 4 /Mg-Al LDH) was successfully synthesized via the co-precipitation method. The Fe 3 O 4 /Mg-Al LDH not only exhibits superior separation efficiency of charge carriers but also possesses signally enhanced photocatalytic activity for CO 2 reduction than Mg-Al LDH. The as-prepared Fe 3 O 4 /Mg-Al LDH affords the CO and CH 4 generation rate of 442.2 µmol g −1 h −1 and 223.9 µmol g −1 h −1 . The enhanced reduction CO 2 activity mainly comes from synergetic effect of Fe 3 O 4 and ultrathin Mg-Al LDH. And Fe 3 O 4 can increase the separation efficiency of photogenerated electron-hole pairs, and ultrathin Mg-Al LDH can reduce the transmission resistance of charge carriers. Moreover, a detailed mechanism insight of Fe 3 O 4 /Mg-Al LDH for CO 2 reduction is also investigated by a series of characterization methods and activity experiments. This work offers a simple and environment-friendly approach to develop recycled photocatalysts in CO 2 reduction treatment.
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PubMed
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METABOLIC ENGINEERING
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2019
·
IF 7.808
Ting Shi,Shan Liu,Yi-Heng P. Job Zhang
Carbon dioxide (CO 2 ) is an appealing carbon feedstock for the sustainable production of biocommodities. Here we designed three in vitro artificial enzymatic pathways featuring the ATP-excess, ATP-deficit, and ATP-balanced pathways for the biotransformation of starch and CO 2 to malate. This ATP-balanced pathway without exogenous ATP donors can auto-regulate its carbon fluxes from glyceraldehyde 3-phosphate to 3-phosphoglycerate via either the ATP-generating pathway (a part of glycolysis) or no-ATP-generating pathway from a hyperthermophilic archaeon Thermococcus kodakarensis . The ATP-balanced pathway enabled to produce up to 52.4 mM malate with 95.3% of the theoretical yield, that is, 2 mol of malate synthesized from 1 mol of glucose of starch and 2 mol of CO 2 . This pathway also enabled to produce high-yield malate regardless of ATP/ADP ratios. Anaerobic reaction conditions and/or the addition of a reducing agent dithiothreitol were of importance for creating an anoxic environment for biocatalysis of enzyme cocktails and for mitigating the deactivation of enzymes and degradation of intermediates. This new pathway could provide a green route for direct conversion of CO2 to many building blocks, a promising alternative of petrochemical-based production of biocommodities.
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RSC Advances
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2019
·Vol. 9
·期 24
·13696-13704
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IF 3.049
Hong Lei,Ruheng Zheng,Yeping Liu,Jiacheng Gao,Xiang Chen,Xiaoliang Feng
Hydrogenation of CO2 to chemicals is of great importance in the reduction of greenhouse gas emission. And the interaction and/or the boundary between Cu and ZnO played a crucial role in the performance of the Cu–ZnO catalyst for CO2 hydrogenation to methanol. In this work, cylindrical shaped ZnO was first synthesized via controlled hydrothermal precipitation of Zn(CO2CH3)2·2H2O, and Cu was further deposited on ZnO via in situ reduction in aqueous solution. Characterizations indicated that the crystallization degree of ZnO decreased with the increasing content of Cu, while the exposed surface area of Cu exhibited a volcano shaped curve. It was found that the cylindrical shaped ZnO combined Cu catalysts were active for the hydrogenation of CO2, and the space time yield of methanol reached 0.50 g-MeOH (g-cat h)−1 at H2/CO2 = 3, 240 °C, 3.0 MPa, and 0.54 mol (g-cat h)−1, but the methanol selectivity decreases with the reduction of the (002) polar plane of ZnO. The conversion of CO2 and methanol selectivity were discussed with the detected exposed Cu surface area and the number of oxygen vacancies.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2018
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IF 4.229
Chongjun Zhao,Pengwei Li,Danmin Shao,Ruizhi Zhang,Shengqi Wang,Zhaoqiang Zhu,Chunhua Zhao
A phytic acid-derived Co 2-x Ni x P 2 O 7 -C/RGO composite was designed and facilely synthesized, in which phytic acid acted as both a phosphoric source and carbon source. Both carbon derived from phytic acid and reduced graphene oxide (RGO) in composite, enhanced the conductivity and thus improve its electrocatalytical capability. As-synthesized Co 1.22 Ni 0.78 P 2 O 7 -C/RGO composite exhibited excellent oxygen evolution reaction (OER) catalytic performances: At the current density of 10 mA cm −2 , only a low overpotential of 283 mV and a small Tafel slope of 51 mV dec −1 were observed. Good OER catalytic performance was retained even after 10 h continuously running at a constant voltage, which is even comparable to those of first-rate noble metal catalyst RuO 2 . In addition, the performances of Co 2-x Ni x P 2 O 7 -C/RGO catalysts were also strongly dependent on Ni content.
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Soft Matter
·
2018
·Vol. 15
·期 3
·462-469
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IF 3.709
Dongfang Liu,Hongsheng Lu,Ying Zhang,Peiyao Zhu,Zhiyu Huang
A microemulsion with a CO2 response was prepared by mixing the surfactant sodium oleate (NaOA), the co-surfactant isopropyl alcohol (IPA), oil phase oleic acid (HOA) and water. This surfactant-based microemulsion (SBME) shows a CO2 responsive behavior, and the introduction of CO2 can breakdown the microemulsion. Through the research in this paper, it is found that the content of IPA has a direct impact on the CO2 response behavior of SBME. It was found that the lower the IPA content (22.73 wt%), the more obvious the CO2 response behavior of SBME. Conversely, when the concentration of IPA is high (54.05 wt% and 63.83 wt%), the introduction of CO2 does not directly lead to the demulsification of the microemulsion. NaOA can be converted to HOA under the action of CO2, which is why SBME shows CO2 response behavior. By comparing the effects of CO2 on the (pseudo-)ternary phase diagrams of SBME and surfactant-free microemulsion (SFME), we found evidence that SBME shows different CO2 response behaviors. When CO2 was bubbled into the SBME system with a low IPA content, IPA cannot stabilize the excessive HOA and water in the system and eventually break the microemulsion. The situation is different when CO2 is applied to the SBME system with a high IPA content. IPA as an amphiphilic solvent can stabilize the HOA and water in the system to form SFME. In this process, SBME can be demulsified (low IPA content) or can be converted to SFME (high IPA content) in the presence of CO2.
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ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Yue Yu,Xu Li,Rajamani Krishna,Yuchuan Liu,Yuanzheng Cui,Jianfeng Du,Zhiqiang Liang,Xiaowei Song,Jihong Yu
Mg, Co-substituted aluminophosphate zeolites with ERI framework topology (denoted as MgAPO-ERI and CoAPO-ERI) have been synthesized under hydrothermal conditions by using N,N,N′,N′-tetramethyl-1,6-hexanediamine as organic template. Their CO2 adsorption properties are investigated in comparison to those of the pure aluminophosphate counterpart AlPO-ERI. CoAPO-ERI shows the highest CO2 uptake of 57.3 cm3 g–1 (273 K and 1 bar) and the highest isosteric heat of 39.0 kJ mol–1 among the three samples. Importantly, the incorporation of Mg2+ and Co2+ ions in the framework of AlPO-ERI can greatly improve the adsorption selectivities of CO2 over CH4 and N2. Whereafter, transient breakthrough simulations were investigated and further proved the advantages of heteroatoms for separations. These results demonstrate that isomorphous heteroatom substitutions in aluminophosphate zeolites play a key role in enhancing CO2 adsorption and separation abilities.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2018
·
IF 1.712
Yangyang Bian,Shufeng Shen
Phase change solvents are attractive energy-efficient absorbents for carbon dioxide (CO 2 ) capture due to CO 2 -rich phase formation. Potassium prolinate + water + ethanol (ProK/W/Eth) solution has shown good capture characteristics as a promising one in our previous work. In this work, absorption rate of CO 2 , solubility of N 2 O, and heat of absorption for ProK/W/Eth solution were investigated using a stirred cell reactor and a CPA201 reaction calorimeter and these results were also compared with the aqueous ProK and 30 mass% MEA solutions. Using ethanol as a solvent can substantially increase the CO 2 physical solubility and the absorption rate of CO 2 in ProK/W/Eth solutions is far higher than that in aqueous 30 mass% MEA solutions especially at a low CO 2 loading range. Solid precipitation, obtained from the liquid-to-solid phase change absorption, was analyzed by 13 C NMR and DSC-TGA. The enthalpy change for ProK/W/Eth solutions at various CO 2 loading was also discussed.
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FUEL
·
2018
·
IF 4.908
Jingai Shao,Junjie Zhang,Xiong Zhang,Ye Feng,Han Zhang,Shihong Zhang,Hanping Chen
To enhance the SO 2 adsorption of biochar, CO 2 activation and impregnation with methyldiethanolamine (MDEA) was simultaneously employed to improve its physicochemical characteristics. Furthermore, the effects of the pore structure and nitrogen functionality on SO 2 adsorption were also explored. The results show that after CO 2 activation, the specific surface area of biochar increased from 56.91 m 2 /g to 755.35 m 2 /g, while this figure dropped to 25.54 m 2 /g or even lower after impregnation with MDEA. Although the pore structure of activated biochar was destroyed, the surface nitrogen content of the nitrogen-enriched biochar (with 10% MDEA impregnation) increased from 1.46% to its highest level (7.20%); moreover, as indicated by Fourier Transform Infrared (FTIR) spectroscopy, the nitrogen functional groups introduced on the surface of the nitrogen-enriched biochar were mainly C-N. After 10% MDEA impregnation, the maximum SO 2 adsorption capacity increased from 57.8 mg/g to 156.2 mg/g. Changes to physical and chemical properties in the nitrogen-enriched biochar indicate that the nitrogen functional groups on the surface are more important than the pore structure for SO 2 adsorption at 393 K, and that the dominant nitrogen species are quaternary nitrogen.
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JOURNAL OF MEMBRANE SCIENCE
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2013
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IF 4.093
Jun Shi,Jin Shi,Chao Du,Qun Chen,Shaokui Cao
Alginate/CaCO 3 hybrid membranes with pH- and thermal-responsive drug release properties were prepared under compressed CO 2 using polyacrylic acid (PAA) as a crystal growth additive. Aliphatic poly(urethane-amine) (PUA) was employed as the thermal-responsive composition in the hybrid membranes. The hybrid membranes were characterized by scanning electron microscopy, energy dispersive X-ray spectrometer, X-ray diffraction and thermogravimetric analyzer. The interaction between PAA and aliphatic PUA contributed the formation of compact CaCO 3 microparticles and the high drug loading efficiency of the hybrid membranes. By adjusting the pressure and reaction time of the biomineralization process, sustained drug release property could be achieved from the hybrid membranes. The results indicated that the compact CaCO 3 microparticles could hinder the permeability of the encapsulated drug and reduce the drug release effectively. Moreover, the thermal-sensitivity of aliphatic PUA and pH-sensitivity of alginate matrix would preserve after the biomineralization process.
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