Carbon Capture Science & Technology
·
2023
·
IF 0
Bowen Lu,Fan Wu,Xiaoshan Li,Cong Luo,Liqi Zhang
The interfacial structure of metal and oxide support plays a pivotal role in reverse water gas shift (RWGS). However, rare work investigated the factor of the metal-oxide interface during RWGS reaction. In this work, the interface of Cu/CeO 2 catalysts was designed through the thermal treatment of copper nitrate salt on CeO 2 with an H 2 atmosphere under different temperatures, and CO 2 hydrogenation performance was studied at 400 °C to investigate the effect of interfacial structure on RWGS reaction. Among these prepared catalysts, Cu/CeO 2 -400 catalysts achieved the best CO 2 conversion activity (CO production rate 1.23 mol/g cat . h). Cu interacted with CeO 2 to form Cu-O-Ce interface and induced more oxygen vacancy formation. The oxygen vacancy around the Cu-CeO 2 interface enhanced CO 2 adsorption and promoted CO 2 conversion. CO 2 reacted with active hydrogen to COOH, then COOH species dissociated into CO and OH adsorbed on the surface of Cu-CeO 2 . These results gave insights into the design of a highly effective catalyst for CO 2 hydrogenation.
✓ 已验证
DOI
FUEL
·
2019
·
IF 5.128
Weijie Geng,Wenxiu Li,Lin Liu,Junhai Liu,Liying Liu,Xiangjin Kong
The hydrodeoxygenation of furfural to 2-methylfuran is of great significance for biomass valorization. However, the design of efficient catalysts based on non-noble metals is still a huge challenge for this transformation. In this work, a uniformly dispersed Cu-Cu 2 O/N-RGO nanocomposite was assembled via microwave assisted reduction and ammonia evaporation synthetic strategy. Under the optimum conditions, the yield of 2-methylfuran reached 95.5%, and there was no catalyst deactivation was observed within 5 cycles. The characterization results confirmed that the activity of the catalyst was mainly attributed to the synergistic effects of surface Cu 0 and Cu + species in catalyst, which were originated from partial reduction of CuO species due to the strong interaction between Cu precursors and support. Furthermore, this strong interaction also promised stability of the catalyst which could immobilize copper particles to resist leaching.
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 23
·8142-8154
·
IF 4
You-Hui Zhao,Hai-Yan Li,David James Young,Xiangqian Cao,Da-Liang Zhu,Zhi-Gang Ren,Hong-Xi Li
Earth-abundant copper(I) coordination complexes of an imine-phosphine and a diimine have been developed as visible-light photocatalysts. Reaction of [Cu(MeCN)4]BF4 with hetero-bidentate phosphinopyrazole (phpz) ligand R1R2C3HN2PPh3 (R1 = R2 = H (1a); R1 = H, R2 = Me (1b); R1 = H, R2 = Ph (1c); R1 = R2 = Me (1d)) and 2,9-dimethyl-1,10-phenanthroline (dmp) gave four heteroleptic bis-chelate Cu(I) complexes [Cu(dmp)(R1R2C3HN2PPh3)]BF4 (R1 = R2 = H (2a); R1 = H, R2 = Me (2b); R1 = H, R2 = Ph (2c); R1 = R2 = Me (2d)) with distorted tetrahedral geometries. Complexes 2a–2d exhibited broad absorption in the visible spectrum and could facilitate photochemical intermolecular atom-transfer radical addition reactions of CBr4, or CCl3Br, CHI3 to styrenes in yields up to 91% and with a broad substrate scope. The absorption, emission, redox potential and photocatalytic activity were dependent on the substituents on the phpz ligand. Mechanistic studies supported an atom-transfer radical addition (ATRA) mechanism.
✓ 已验证
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2022
·Vol. 169
·期 5
·056523
·
IF 4.386
Chuanhui Zhu,Guo-Hong Cai,Chongyang Yuan,Bin Huang,Guangqin Li,Mark Croft,Martha Greenblatt,Man-Rong Li
Exploring a simple model system to realize the intrinsic guidelines of activity for oxide electrocatalysts is urgent and important. Here, we introduce delafossite oxides A2IrO3 (A = Li, Na, Cu) as a family of oxygen evolution reaction electrocatalysts in alkaline media. We show that, in Cu2IrO3, the intrinsic intersite charge transfer between Cu and Ir improves the electrocatalytic activity by simultaneously increasing the conductivity and reducing the Tafel slope down to 51 mV dec−1 with an overpotential η10 = 361 mV. Through a comparative study, the improved activity of Cu2IrO3 is attributed to the increase of Ir 5d projected electronic density of states with extended Ir–O bond length. This study provides insights into advanced catalyst design through tailoring the active site of oxides by the modulation of electronic states in a given structural motif.
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 28
·期 30
·41504-41515
·
IF 4.223
Zhao Kang-He,Ma Yu-Long,Lin Feng,Ge Shao-Ying,Zhu Li
A composite Mn-Cu-Ce tri-metal oxide supported on γ-Al 2 O 3 (Mn-Cu-Ce/Al 2 O 3 ) catalyst was prepared by an impregnation-calcination method and investigated in the catalytic ozonation treatment of real coal chemical wastewater (CCW). The catalyst was characterized by XRD, SEM, TEM, XRF, BET, and XPS techniques. The results showed that Mn, Cu, and Ce metal oxides were evenly distributed on the Al 2 O 3 surface and the catalyst maintained a large surface area and a high pore volume compared with the pristine Al 2 O 3 . The synergy between Mn, Cu, and Ce oxides greatly enriched the catalytic active sites and enhanced the ozonation performance. The catalytic ozonation process with Mn-Cu-Ce/Al 2 O 3 increased the removal rate of total organic carbon (TOC) by 31.6% compared with ozonation alone. The ketones, aromatic compounds, phenols, and nitrogen-containing heterocyclic compounds in CCW have been effectively degraded and mineralized by Mn-Cu-Ce/Al 2 O 3 catalytic ozonation process, and its biodegradability has also been significantly improved. The experimental results of ∙OH scavengers revealed that the mechanism of Mn-Cu-Ce/Al 2 O 3 catalytic ozonation was to promote the generation of ∙OH radicals. The catalytic activity of Mn-Cu-Ce/Al 2 O 3 was only a slight decrease in six consecutive catalytic ozonation treatments, showing good stability. Therefore, Mn-Cu-Ce/Al 2 O 3 can be used as a candidate catalyst for the advanced treatment of refractory organic wastewaters upon catalytic ozonation.
✓ 已验证
DOI
高影响因子
Frontiers in Marine Science
·
2021
·
IF 4.912
Han Xiaoxin,Vogt Rolf D.,Zhou Jiaying,Zheng Boyang,Yu Xue,Feng Jianfeng,Lu Xueqiang
Environmental effects of microplastic are rather due to their adsorption capacity of contaminants than themselves. Aging is a key factor influencing adsorption properties of environmental microplastics. In order to clarify this influence, polyethylene (PE), polypropylene (PP), and polyethylene terephthalate (PET) microplastics with particle sizes of <0.9 mm, 0.9–2 mm, and 2–5 mm were artificially aged in seawater for 12 months. This enabled an assessment of the change in Cu(II) adsorption capacity to the microplastics particles under aging. According to the FTIR spectra, fresh microplastics were oxidized during the UV induced aging process. The adsorption capacities of microplastic were positively correlated with their aging time. After 12-months aging, the amount of Cu(II) adsorbed to the aged microplastics was 1.45–2.92 times higher than on the fresh microplastic particles. For PP and PET, the aging effect increased with decreasing size of the microplastic particles. In the case of PE, particles with the medium particle size (0.9–2 mm) had the strongest aging effect.
✓ 已验证
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2018
·Vol. 15
·期 6
·1490-1501
·
IF 1.165
Xiangli Kong,Minghui Qiu,Anran Wang,Lu Yang,Rongfei Zhou,Yiqun Fan,Deshuang Kong,Changjun Gu
The adhesion and cohesion between the coating layers and the ceramic honeycombs are usually one of the key issues in the preparation of high-performance zeolite-based/Monolith catalysts. In this work, we investigate the deposition of high-efficiency Cu-SAPO-34 catalyst on a cordierite monolith with special focus on the impact of alumina binders on the structure, mechanical adhesion and cohesion, and catalytic performance of the monolithic catalyst. Two kinds of alumina nanoparticles, α-alumina and γ-alumina, have no significant impacts on the Cu-SAPO-34 crystal structure, micropore morphology and catalytic activity. But washcoating experiments showed that the mass loss rate of the coating was less and the loading of the catalyst was higher when α-alumina was used as the binder. The reason of improving the adhesion and cohesion strength is the suitable thermal shrinkage, the uniform distribution and densification structure of α-alumina. Furthermore, optimization of the coating formulation with α-alumina as the binder has been performed. Finally, the catalyst prepared under the optimal conditions was tested by SCR and a maximum conversion rate of 97.4% was obtained. It was concluded that the use of the washcoating method with α-alumina does not affect catalytic performance while it increases bonding strength between substrate and catalysts.
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2016
·
IF 4.836
Chunzhen Fan,Kan Li,Juexiu Li,Diwen Ying,Yalin Wang,Jinping Jia
In this paper, tetraethylenepentamine (TEPA) modified chitosan/CoFe 2 O 4 particles were prepared for comparative and competitive adsorption of Cu(II) and Pb(II) in single and bi-component aqueous solutions. The characteristics results of SEM, FTIR and XRD indicated that the adsorbent was successfully fabricated. The magnetic property results manifested that the particles with saturation magnetization value of 63.83 emu g −1 would have a fast magnetic response. The effects of experimental parameters including contact time, pH value, initial metal ions concentration and coexisting ions on single and bi-component adsorption were investigated. The results revealed that the adsorption kinetic was followed pseudo-second-order kinetic model, indicating that chemical adsorption was the rate-limiting step. Sorption isotherms were also determined in single and bi-component solutions with different mass ratio of Cu(II) to Pb(II) (Cu(II)/Pb(II)) and fitted using Langmuir and Freundlich isotherm models. A better fit for Cu(II) and Pb(II) adsorption were obtained with Langmuir model, with a maximum sorption capacity of 168.067 and 228.311 mg g −1 for Cu(II) and Pb(II) in single component solution, 139.860 and 160.256 mg g −1 in bi-component solution (Cu(II)/Pb(II) = 1:1), respectively. The present results suggest that TEPA modified chitosan/CoFe 2 O 4 particles are feasible and satisfactory adsorbent for efficient removal of Cu(II) and Pb(II) ions.
✓ 已验证
DOI
高影响因子
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2018
·
IF 3.974
Xiaofeng Yi,Fuliang Sun,Zhenhua Han,Fuhao Han,Jiarui He,Minrui Ou,Junjie Gu,Xiaoping Xu
In this work, a novel sodium alginate (SA)/polyvinyl alcohol (PVA)/graphene oxide (GO) hydrogel microspheres were prepared by a simple method. Sodium alginate was physically crosslinked by Ca 2+ ; GO was encapsulated into the composite to strengthen the hydrogels; PVA played a significant role in well dispersing of GO in SA. The SA/PVA/GO (SPG) hydrogels were employed as an efficient adsorbent for removal of Cu (II) and U (VI) from aqueous solution. Batch experiments with the subject of the pH, initial metal ion concentration , competing ions and contact time were investigated. Structure characterization was successfully conducted by FTIR, SEM, EDX, BET and XPS. Furthermore, the sorption kinetics of Cu 2+ and UO 2 2+ followed pseudo-second order model and exhibited 3-stage intraparticle diffusion model. Equilibrium data were best described by Langmuir model and the obtained maximum adsorption capacities of SPG hydrogel microspheres for Cu 2+ and UO 2 2+ were 247.16 and 403.78 mg/g, respectively. The difference in adsorption capacity can be confirmed by the percentage of elements in EDX spectra and the intension of peak of elements in XPS spectra. The SPG sorbent exhibited excellent reusability after 5 adsorption-desorption cycles. All results suggested that the prepared adsorbents could be considered as effective and promising materials for removal of Cu (II) and U (VI) in wastewater.
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Xiaopeng Han,Ying Huang,Qiao Gao,Rui Fan,Xuanyi Peng
NT@Cu and Ag@GF supported the aluminum (Al) composites had been synthesized by vacuum gas pressure infiltration and their microstructure, Coefficient of thermal expansion (CTE), thermal and mechanical properties were investigated. Cu particles encapsulated with NT had been designed to improve the dispersion of NT and form a carbon conductive network. The chemical plating process was used to enhance the wettability between graphite flakes (GF) and Al matrix and eliminate the harmful interfacial reactions. The composites of NT3 had displayed excellent in-plane thermal conductivity (TC) of 378.48 W/mK and stable CTE in high temperature application environment. What's more, the bending strength had been enhanced to approximately 85.15 Mpa. In this study, the innovative way can be applied to fabricate NT@Cu/Ag@GF/Al composites.
✓ 已验证
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2018
·
IF 5.123
Ruifeng Peng,Haibo He,Qian Wang,Xiaoxia Yan,Qiongwei Yu,Haixiao Qin,Yunyi Lei,Liqiang Luo,Yuqi Feng
In this study, we proposed a novel anti-aggregation of gold nanoparticles (AuNPs) strategy for colorimetric sensing of iodide ions (I − ) regulated by the redox reaction between the target ions and the ion cross-linking agent. Cu 2+ as interlinking ion can induce aggregation of arginine capped AuNPs (Arg-AuNPs) due to the formation of Arg-Cu 2+ -Arg analogous structure resulting from the chelation between Cu 2+ and arginine, with a clear color change of solution from red to blue. In the presence of I − , however, Cu 2+ would be readily reduced owing to the formation of CuI, AuNPs underwent a transformation from an aggregation to a dispersion state depending on the concentration of I − , leading color changes from blue to red. The corresponding color variation in the process of anti-aggregation of AuNPs can be monitored through UV–vis spectrophotometer or by the naked-eye, making quantitative analysis of I − feasible in a convenient colorimetric or visual way. The assay only took 5 min, showing high sensitivity with a lowest detectable concentration of 10 nM and excellent selectivity for I − over other anions tested, which was successfully applied for the detection of I − in drinking water and table salt samples.
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 135
·期 45
·46705
·
IF 1.901
Dapeng Gu,Longxiao Zhang,Suwen Chen,Kefeng Song,Shouyao Liu
The filling combination of polytetrafluoroethylene (PTFE)/Cu/Al 2 O 3 filled poly(methyl methacrylate) (PMMA) based composites aiming at low friction and wear is optimized based on L 9 (3 4 ) by Taguchi method. The worn morphologies of PMMA based composites are analyzed by scanning electron microscopy (SEM). The PTFE transfer film and the wear debris on the steel ball surface are analyzed by SEM and X-ray spectroscopy. It is observed that the friction and wear of PMMA can be obviously decreased by filling with PTFE, Cu, and Al 2 O 3 . PTFE has the most significant but Cu has the negligibly smallest contribution on both the friction coefficient and the wear rate. The lower friction coefficient (<0.2) appears by the combination of the mass ratio of PTFE larger than about 4.5% and the mass ratio of Al 2 O 3 lower than ∼7.5%. The lower wear rate (<5 × 10 −5 mm 3 /Nm) appears by the combination of the mass ratio of PTFE larger than about 5% and the mass ratio of Al 2 O 3 lower than ∼8%, but it does not include that PTFE is greater than about 8.5% and Al 2 O 3 is less than about 1.5%. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46705.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）