FUEL
·
2018
·
IF 4.908
Yun-Chuan Pu,Shui-Rong Li,Shuai Yan,Xiao Huang,Duo Wang,Yue-Yuan Ye,Yun-Quan Liu
Copper sintering at temperatures above 200 °C has been a big challenge for the application of copper-based catalysts in methanol reforming for hydrogen production. In the present work, a Cu/ZnO catalyst promoted by Sc 2 O 3 was developed, which is capable of converting methanol into hydrogen-rich gas with good activity and decent stability in the temperature range of 220–600 °C. The role of Sc in Cu/Sc 2 O 3 -ZnO catalysts was explored through the XRD, H 2 -TPR, N 2 O chemisorption, TEM, Raman, and XPS analyses. The results indicated that ZnO lattice was doped with the Sc 3+ ion, which led to increased metal dispersion, strengthened interaction between Cu metal and support oxide, and subsequently enhanced catalytic activity and stability of the Cu/Sc 2 O 3 -ZnO catalyst in methanol reforming for hydrogen production.
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 43
·期 4
·1812-1817
·
IF 3.201
Yang Li,Zhicheng Liu,Lu Bai,Yaqing Liu
Nitrogen-doped carbon dots were facilely synthesized via the chemical breakdown of electrospun polyacrylonitrile-based carbon nanofibers. The results of transmission electron microscopy, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, and Raman spectroscopy demonstrated that the prepared N-doped carbon dots with a relatively narrow size distribution exhibited abundant C, N, and O containing functional groups. In the meantime, aqueous N-doped carbon dots exhibited excitation-dependent photoluminescence. Moreover, due to the quenching effect induced by the strong coordination interaction between the Cu2+ ions and the surface functional groups of the obtained N-doped carbon dots, an efficient fluorescent sensing platform was developed to detect Cu2+ ions, showing high sensitivity and selectivity to Cu2+ ions with a detection limit of 5 nM in the linear range of 0–10 μM. This work has provided a simple and effective approach for fabricating N-doped carbon dots as a promising fluorescent material for heavy metal sensing.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Xiyang Liu,Fei Huang,Yang Yu,Peng Zhao,Yuanbo Zhou,Yide He,Yanhua Xu,Yongjun Zhang
In this study, the degradation of ofloxacin (OFX) over Cu–Ce tyre carbon catalysts by the microwave assisted persulfate process was examined for the first time. The results showed that the Cu–Ce tyre carbon catalysts dramatically improved OFX decay efficiency. The optimal reaction conditions were the Cu–Ce tyre carbon catalysts of 2.0 g/L and the persulfate dosage of 12.0 g/L under microwave power of 400 W at 60 °C. The OFX conversion and total organic carbon (TOC) removal reached 95.8% and 87.6%, respectively, after 60 min catalytic oxidation under optimal conditions. To identify the properties of Cu–Ce tyre carbon catalyst, scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), the Brunauer-Emmett-Teller (BET), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and the ultraviolet–visible (UV–vis) diffuse reflectance spectra studies have been carried out. Eleven kinds of degradation products and five pathways during degradation process of OFX and degradation products were identified by GC–MS and HRMS.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2018
·
IF 4.521
Shaozhong Li,Yu Wang,Bin Yang,Limin Guo
Mesostructured catalysts with optimized microstructure and surface properties endowed them attractive catalytic performance. Herein, the mesostructured AlCeO supports with different weight ratio of Al 2 O 3 and CeO 2 have been prepared on the basis of a self-assembly sol-gel process, then 15 wt.% Cu was loaded onto the mesostructured AlCeO supports by incipient wetness impregnation method. The mesostructured AlCeO supports with varied ratio of Al 2 O 3 to CeO 2 resulted in the very different Cu particle size, and for the optimized catalyst Cu/AlCeO-7 (the amount of Al 2 O 3 in AlCeO support was 70 wt.%), the Cu crystal size was around 7 nm based on the characterization of XRD and TEM. The Cu/AlCeO-7 catalyst had strong metal-support interactions (SMSI) and more Cu-ceria interface, which was confirmed by the XPS. Furthermore, the Cu/AlCeO-7 catalyst showed the highest exposed Cu surface area ( S Cu ) (25.5 m 2 /g cat ) from the analysis results of H 2 -TPR and dissociative chemisorption of nitrous oxide. The CO 2 -TPD results demonstrated the Cu/AlCeO-7 had strong surface basicity. Hence, Cu/AlCeO-7 catalyst showed the highest space time yield of methanol (STY MeOH ). The CO 2 conversion (Cu/AlCeO-7, V(H 2 )/V(CO 2 ) = 3/1, GHSV = 6000 mL h −1 g −1 and P = 4 MPa) was up to 22.5% at 553 K, the methanol selectivity can reach 94% at 473 K, and the STY MeOH was up to 7.2 mmol g cat. -1 h -1 at 493 K. The as-prepared mesostructured Cu/AlCeO-7 exhibited a promising catalyst candidate for CO 2 hydrogenation to methanol.
✓ 已验证
产品关联
DOI
高影响因子
Chemical Science
·
2019
·Vol. 10
·期 12
·3556-3566
·
IF 9.556
Yanan Liu,Alan J. McCue,Pengfei Yang,Yufei He,Lirong Zheng,Xingzhong Cao,Yi Man,Junting Feng,James A. Anderson,Dianqing Li
The impregnation method is commonly employed to prepare supported multi-metallic catalysts but it is often difficult to achieve homogeneous and stable alloy structures. In this work, we revealed the dependence of alloying behavior on the support morphology by fabricating Ni–Cu over different shaped CeO2. Specifically, nanocube ceria favoured the formation of monometallic Cu and Ni-rich phases whereas polycrystalline and nanorod ceria induced the formation of a mixture of Cu-rich alloys with monometallic Ni. Surprisingly, nanopolyhedron (NP) ceria led to the generation of homogeneous Ni–Cu nanoalloys owing to the equivalent interactions of Ni and Cu species with CeO2 (111) facets which exposed relatively few coordinative unsaturated sites. More importantly, a strong interfacial effect was observed for Ni–Cu/CeO2-NP due to the presence of CeOx adjacent to metal sites at the interface, resulting in excellent stability of the alloy structure. With the aid of CeOx, NiCu nanoalloys showed outstanding catalytic behaviour in acetylene and hexyne hydrogenation reactions. This study provides valuable insights into how fully alloyed and stable catalysts may be prepared by tailoring the support morphology while still employing a universal impregnation method.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2019
·
IF 1.795
Tursunjan Aydan,Chao Yang,Yang Xu,Tongtong Yuan,Min Zhang,Hui Li,Xueming Liu,Xintai Su,Jide Wang
A Hybrid magnetic composite material Fe 3 O 4 @Cu x O y /C (where, x = 1–2; y = 0–1) was prepared via pyrolysis of FeOOH decorated Cu 3 (BTC) 2 (where, BTC = 1, 3, 5-benzenetricarboxylic acid) as a precursor. The obtained products was successfully applied to reduction reaction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) as a catalyst. Compared with other reported materials, Fe 3 O 4 @Cu x O y /C exhibits high catalytic activity with excellent recyclability.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Xiaofeng Dai,Wen Xu,Teng Zhang,Hongbin Shi,Tao Wang
The monodisperse Cu-Ag core-shell nanoparticles (Cu@Ag NPs) for electric conductive inks were successfully prepared by a simple two-step process consisting of thermal decomposition and galvanic displacement. It was found that 20 mol.% coverage of Ag enabled Cu@Ag NPs oxidation resisting with air. A new approach to achieve coalescence and sintering of Cu@Ag NPs at room temperature was proposed. 1-amino-2-propanol (MIPA), hydrophilic amine with a short C-chain, was first applied to replace the strong stabilizer, the strong stabilizer oleylamine (OAM) adsorbed on particles, thereby obtained preliminary agglomeration and hydrophobic -to- hydrophilic transition to improve the wetting capability of electrolyte solution on the surface of metal film. Then, the reducing electrolyte NaBH 4 solution was used as the destabilizing agent to deeply coalesce particles, and also inhibit the electrochemical corrosion. It takes only a few minutes to achieve sintering in air at room temperature. Due to the effective sintering at room temperature, the conductive patterns could be formed on thermo-sensitive substrates. The eventual resistivity was found to be as low as 36.3 μΩ·cm.
✓ 已验证
产品关联
DOI
高影响因子
Results in Physics
·
2019
·
IF 3.042
Yang Zhou,Xiaoyuan Liu,Ke Wang,Jing Li,Xinglai Zhang,Xin Jin,Xinyue Tang,Xiuhui Zhu,Ruishi Zhang,Xin Jiang,Baodan Liu
Series of “Hopcalite” catalysts for low-temperature CO oxidation are prepared through a facile ultra-sonic spray pyrolysis approach. It has been found that the spray pyrolysis temperature and Cu/Mn atomic ratio in initial precursors show significant impacts on the catalytic activity of Cu-Mn-O catalysts. The catalyst synthesized at 550 °C with Cu/Mn = 1/2 in precursor (Cu1Mn2-550) shows the highest catalytic activity towards CO oxidation (T 100 = 63 °C; E a = 17.04 KJ mol −1 ), owing to the formation of CuMn 2 O 4 phase with poor crystallinity. The synergistic effect of Cu and Mn species in spinel Cu-Mn-O phases attributes to the evaluated catalytic activity compared with those of pure oxides of copper or manganese towards CO oxidation. The results reveal that Cu1Mn2-550 not only provides more defects and vacancies to create more active sites, but also generates more highly active Cu (II) to promote CO oxidation. On the contrary, the decreasing amount of Cu (II) and the higher degree of crystallinity resulting from higher synthesis temperature lead to the deterioration of catalytic activity. Moreover, the phase transformation among the Cu x Mn 3-x O 4 spinels also shows significant effect on CO conversion rate. Finally, the formation mechanism of Cu-Mn-O catalysts and related CO oxidation process are discussed based on series of characterizations.
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2018
·
IF 3.414
Bowen Pu,Junwei Sha,Enzuo Liu,Chunnian He,Naiqin Zhao
Traditional laminated metal matrix composites are confined to two-component system of pure metal matrix and its reinforcement. To achieve further improvement of the applied mechanical properties , in this work, the soft phase of laminated composites was enhanced by alloying with Cu. The synergistic effect of Cu on phases of both soft and hard including in-situ catalyzing and precipitation hardening was firstly explored. The laminated graphene nanosheets (GNSs) /AlCu composites of 2 vol% GNSs, were fabricated by ball milling and hot-rolling processes with much higher mechanical properties. The multi-pass hot rolling provided the solution-precipitation process of Cu transforming into Al 2 Cu and significantly increased the dislocation density of the original soft Al matrix. In addition, the fracture mechanism and fracture model of the laminated GNSs/AlCu composites were also investigated.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2019
·Vol. 125
·期 6
·1-10
·
IF 1.784
Zhou Jinxuan,Zhang Zhibin,Yu Xiaofeng,Shi Xueting,Feng Libang
Abstract The superhydrophobic materials have generated wide interest due to the broad application prospect. However, the superhydrophobicity of artificial superhydrophobic surfaces is easy to lose and which has caused widespread concern. In this work, Cu-based superhydrophobic materials with self-similarity in texture and composition both externally and internally were fabricated using a facile and environment-friendly approach. The as-prepared Cu-based materials not only behave excellent superhydrophobicity, but also show outstanding repellence universality to various liquids, excellent UV resistance and storage stability, and wide pH toleration. More importantly, the as-prepared samples present outstanding superhydrophobicity regenerability once the superhydrophobicity has been destroyed by abrasion, scratch, or fouling. In addition, the Cu-based superhydrophobic materials take on excellent self-cleaning performance and pollutants are difficult to adhere onto the material surfaces. Even if some pollutants have adhered onto the surfaces, they can be cleaned up easily by rolling water droplets. Graphic abstract The superhydrophobic Cu-based materials with self-similarity in texture and composition both externally and internally were prepared. The as-prepared superhydrophobic materials show outstanding repellent universality to various liquids, excellent UV resistance and storage stability, wide pH toleration, and self-cleaning performance. More importantly, the block materials present outstanding superhydrophobicity regenerability once the surfaces have been destroyed by abrasion, scratch, or fouling.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2019
·
IF 4.784
Hong Zhang,A.M. Omer,Zhaohong Hu,Li-Ye Yang,Chao Ji,Xiao-kun Ouyang
In this work, composite hydrogel beads based on magnetic bentonite/carboxymethyl chitosan/sodium alginate (Mag-Ben/CCS/Alg) were fabricated and their ability to adsorb copper ions in water was studied. The structure and properties of the composite were characterized via SEM, FTIR, XPS, TGA , VSM, and Zeta potential tests. The effects of the adsorbent dosage, adsorption time, pH, temperature, and initial concentration of Cu(II) on the adsorption results were studied. The results showed that Mag-Ben/CCS/Alg reached equilibrium after 90 min of adsorption, the removal rate of Cu(II) was 92.62 ± 0.39%, and the maximum adsorption capacity was 56.79 mg/g (30 °C). The removal rate of Cu(II) by Mag-Ben/CCS/Alg still remained above 80% after recycling four times. The adsorption process of Cu(II) by Mag-Ben/CCS/Alg occurred in accordance with the quasi-second-order kinetic model and Langmuir adsorption isotherm. The adsorption process was spontaneous and endothermic.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2019
·
IF 5.108
Jingchun Yan,Yudong Chen,Weiguo Gao,Yun Chen,Linbo Qian,Lu Han,Mengfang Chen
A high catalytic system using Cu layered double hydrotalcite (Cu(II)-Mg(II)-Fe(III)LDHs) and hydrogen peroxide (H 2 O 2 ) was developed for the degradation of ethylbenzene. It was identified that the degradation efficiency of ethylbenzene (0.08 mmol L −1 ) and TOC removal were 96.1% and 39.7% respectively in the presence of 0.1 g L −1 Cu(II)-Mg(II)-Fe(III)LDHs with (Cu 2+ + Mg 2+ )/Fe 3+ molar ratio of 5.0 and 0.16 mmol L −1 H 2 O 2 in 6.0 h. Based on ESR and XPS data, hydroxyl radicals (•OH) were the predominant free radical specials generated from the catalytic decomposition of H 2 O 2 for the degradation of ethylbenzene. The redox of Cu(II)/Cu(III) on the layered Cu(II)-Mg(II)-Fe(III)LDHs surface active sites accounted for the formation of •OH radicals and the cycle of Cu(II) in the Cu(II)-Mg(II)-Fe(III)LDHs/H 2 O 2 system were proposed.
✓ 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）