APPLIED CATALYSIS A-GENERAL
·
2021
·
IF 5.706
Yihui Li,Wei Lu,Ziang Zhao,Min Zhao,Yuan Lyu,Leifeng Gong,Hejun Zhu,Yunjie Ding
Surface oxygen groups of carbon materials has been validated to be necessary for the synthesis of supported catalysts. Herein we report that the activity and selectivity of activated carbon-based material supported Co catalysts can be tuned by modifying the surface oxygen group concentration. As the groups were cleansed by H 2 at 1173 K, the FTS activity dropped from 8.4 to 4.0 mmol CO/(gcat∙h). Whereas a following oxidation procedure could restore the FTS activity by regenerating the groups. Among which the HNO 3 treatment exhibited the best effect with a remarkable elevation of activity (from 4.0 to 13.6 mmol CO/(gcat∙h)) and C 5+ /ROH combined selectivity (64.9 C%). Characterization methods proved that the rationale behind which should be attributed to the increased Co dispersion/reduction degrees and CO/H 2 uptakes facilitated by the surface oxygen groups, and it exhibited that the activity of FTS increased as the surface oxygen group concentration and acidity were elevated.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2020
·Vol. 27
·期 21
·26621-26630
·
IF 3.056
Wan Jun,Chen Lin,Li Qiang,Ye Yuxuan,Feng Xiaonan,Zhou Aijiao,Long Xuejun,Xia Dongsheng,Zhang Tian C.
Among the Cu(II) removal methods, adsorption is a favorable technique and has attracted large attention because of its effectiveness and low cost. In quest of seeking for a favorable adsorbent with a high Cu(II) adsorption capacity and excellent reusability, researchers have paid much attention to hydrogels with three-dimensional networks. In this study, a novel hydrogel (P(AMPS-co-VDT) hydrogel) based on free-radical polymerization was synthesized with ionic monomer sodium 2-acrylamido-2-methylpropane sulfate (AMPS-Na + ) and 2-vinyl-4, 6-diamino-1, 3, 5-triazine (VDT) and applied for Cu(II) adsorption in aqueous solutions. The hydrogel was characterized for swelling performance, surface morphology, functional groups, thermal gravimetric behavior, and elements. The maximum Cu(II) adsorption capacity (175.75 mg/g) was relatively high compared with other hydrogels. The P(AMPS-co-VDT) hydrogel also was found to have a relatively good Cu(II) desorption and reuse behavior. The adsorption mechanism could be chelation and ion exchange. This work provides a new hydrogel for effective Cu(II) removal in the future.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
PubMed
高影响因子
KINETICS AND CATALYSIS
·
2018
·Vol. 58
·期 6
·758-762
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IF 0.926
Shao Linjun,Chen Qiuling,Qi Chenze
Metal-Salen (M = Fe, Co, Ni, Cu, Zn) complexes were synthesized to catalyze the oxidation of benzoin to benzil with air as the “green” oxidizing reagent. The effects of temperature, base and solvent on M-Salen catalyzed oxidation of benzoin had been examined and optimized. The catalysis results showed that Co-Salen and Fe-Salen complexes were efficient to catalyze the oxidation reaction with yields over 80% while the catalytic activities of other three M-Salen complexes were poor. Moreover, the Co-Salen catalysis system could be reused three times with satisfied yield.
研究领域:
有机化学
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催化化学
✓ 已验证
DOI
高影响因子
Nano Research
·
2021
·Vol. 14
·期 7
·2441-2450
·
IF 8.897
Peng Lingxin,Tian Han,Cui Xiangzhi,Su Liang,Meng Ge,Ma Zhonghua,Cao Shaowen,Shi Jianlin
Developing anode catalysts of substantially enhanced activity for hydrogen oxidation reaction (HOR) and anti-CO poisoning performance is of great importance for the application of proton exchange membrane fuel cells (PEMFCs). Herein, we report Pd cluster in situ decorated urchin-like W 18 O 49 (WO 2.72 ) electrocatalysts by a photo-reduction method for high performance HOR. The synthesized Pd-WO 2.72 -L composite of low loading amount of 0.44 wt.% Pd by Xenon light reduction exhibits markedly high HOR catalytic activity and stability in 0.5 M H 2 SO 4 , and the specific HOR current density and mass activity of Pd-WO 2.72 -L are ∼ 1.5 and ∼ 80 times those of 20 wt.% Pt/C catalyst, respectively. Moreover, excellent anti-CO poisoning ability has also been obtained. The excellent HOR activity and anti-CO poisoning performance of Pd-WO 2.72 -L have been discussed mainly in terms of the dual synergetic catalytic effects between Pd and WO 2.72 : Pd activation to Pd δ+ by the electron transfer from Pd to W promotes the hydrogen adsorption and activation to H* species, which results in largely elevated HOR activity; Pd degradation due to the CO poisoning is effectively prevented by WO 2.72 , which is responsible for the excellent CO-tolerance performance.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 14
·21267-21278
·
IF 0
Zhao Dongling,Geng Linlin,Jia Yanfei,Wei Jianwen,Zhou Xiaobin,Liao Lei
High-temperature solid adsorbent Li 4 SiO 4 has received broad attention due to its high theoretical adsorption capacity, high regeneration capacity, and wide range of raw materials for preparation. In this paper, a Li 4 SiO 4 adsorbent was prepared by MCM-48 as the silica precursor and modified by doping with metal ions (Ca 2+ and Na + ) for high-temperature capture of low-concentration CO 2 . The results showed that the surface of the Ca-doped (or Na-doped) Li 4 SiO 4 adsorbent developed some particles that are primarily composed by Li 2 CaSiO 4 (or Li 3 NaSiO 4 ). Furthermore, the grains of the adsorbents became finer, effectively increasing the specific surface area and enhancing adsorption performance. Under 15 vol% CO 2 , the maximum CO 2 adsorption was 25.63 wt% and 32.86 wt% when the Ca 2+ doping amount was 0.06 and the Na + doping amount was 0.12, respectively. These values were both higher than the adsorption capacity before the metal ion doping. After 10 adsorption/desorption cycles, the adsorption capacity of Na-doped Li 4 SiO 4 increased by 9.68 wt%, while that of Ca-doped Li 4 SiO 4 decreased by 7.98 wt%. This difference could be attributed to the easy sintering of the Ca-containing adsorbent. Furthermore, a biexponential model was used to fit the CO 2 adsorption curve of the adsorbent in order to study the adsorption kinetics. Compared to the conventional Li 4 SiO 4 , the Ca/Na-doped adsorbent offers several advantages, such as a high CO 2 adsorption capacity and stable cycling ability.
研究领域:
材料科学
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环境工程
·
化学工程
·
吸附技术
✓ 已验证
DOI
ACS Omega
·
2022
·
IF 4.132
Jialu Huang,Zhiming Ni,Xiaofan Song,Han Li,Xiaolei Chen,Aichuang Zhang,Hu Yang,Yuan Liu,Peng Zhu,Ping Hua,Xiaolei Yuan
PdPb nanocrystals have drawn considerable attention due to their excellent catalytic properties, while their practical applications have been impeded by the severe degradation of activity, which is caused by the adsorption of intermediates (especially CO) during the operation. Herein, we first present porous PdPb alloys with the incorporation of amorphous Pb(OH)2 species as highly active and stable electrocatalysts. Alloying Pd with Pb species is initially proposed to optimize the Pd–Pd interatomic distance and adjust the d-band center of Pd. Importantly, the amorphous Pb(OH)2 species are beneficial to promoting the formation of OHad and the removal of COad. Therefore, PdPb-Pb(OH)2 catalysts show a mass activity of 3.18 A mgPd–1 and keep excellent stability for the ethanol oxidation reaction (EOR). In addition, further CO stripping and a series of CO poisoning experiments indicate that PdPb-Pb(OH)2 composites possess much better CO tolerance benefiting from the tuned electronic structure of Pd and surface incorporation of Pb(OH)2 species.
研究领域:
材料科学
·
电化学
·
催化
✓ 已验证
DOI
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2022
·
IF 4.383
Jingrong Wang,Zhihua Gao,Pengquan Yan,Yaxing Shen,Rui Yang,Zhijun Zuo,Wei Huang
CuO with a large microcrystalline differentiation was prepared by hydrothermal method , and the activity of the CuZnAl catalysts prepared by combining CuO with ZnAl was tested in the CO hydrogenation reaction. The effect of Cu species crystallite size on catalytic structure and performance was revealed. The experimental results show that CuO crystallite grow with the raising of hydrothermal temperature. When the hydrothermal temperature was 130 °C, CZA-130 exhibited the stable crystallite size of Cu species, high Cu/Zn molar ratio, and strong interaction between copper and zinc oxide, so the selectivity of total alcohol could reach up to 71.39%. Moreover, the ratio of C 2+ OH in the alcohol product is positively correlated with higher ratio of Cu + /Cu 0 and total number of alkalis, which are related to the ability of growing carbon chain.
研究领域:
化学工程
·
催化科学
✓ 已验证
DOI
高影响因子
ChemCatChem
·
2024
·
IF 3.8
Chao Wang,Chunqun Qin,Mingzheng Liao,Yanping Du,Jiming Gao,Yanbing Wu
High-entropy oxides (HEOs), known for their excellent thermodynamic stability due to their high-entropy effect. In this study, high-entropy (NixAlCoCrMn)3O4 oxides of spinel structure were synthesized by sol-gel method. This HEO has a self-reconfiguration properties in the reaction, and its internal Ni and Co ions exsolve to form a uniformly dispersed NiCot alloy on the surface. The increase of Ni content promotes the exsolution of Ni and Co ions from the interior of the spinel. The high-entropy with a large number of oxygen vacancies not only possesses a stable structure to limit the migration of NiCo alloys, but also enhances the hydrogen overflow. In the CO methanation reaction, it has 99% CO conversion with 87% methane selectivity within 400 oC, and it is stable in the long-term test. This work provides a new idea for exploring the use of high-entropy materials to improve thermal catalytic activity and stability.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
Journal of Energy Storage
·
2022
·
IF 8.907
Lei Liu,Zijian Zhou,Yue Zhou,Dejun Peng,Xiaowei Liu,Minghou Xu
Co-based oxides have been considered as one of the most promising materials for thermochemical energy storage (TCES) systems, however, the high operation temperature limits their applications. Specially, when Co 3 O 4 -based materials are used in concentrated solar power (CSP) system, a large mirror field area is required to meet the high endothermic temperature, which significantly increases the cost of a CSP system. In addition, the high cost of Co-based materials also limits its application. Improving the energy density can effectively reduce the use of the materials. Thus, in this work, to reduce the reduction onset temperature and increase the energy density of Co-based oxides, the TCES performance of Co 3-x Mg x O 4 oxides is investigated. Co 2.8 Mg 0.2 O 4 shows the best TCES performance. The reduction onset temperature of Co 2.8 Mg 0.2 O 4 is ∼775.6 °C, which is 133.7 °C lower than that of the pure Co 3 O 4 (∼909.3 °C). Mg-decoration can also improve the energy density of Co 3 O 4 by 8.02 %. Furthermore, the in situ XRD spectra of the oxides indicate that precipitation of MgO from the Co 3 O 4 lattice during the reduction reaction result in a metastable structure of the oxide, which is conducive to its reduction reaction. Density functional theory calculations indicate that Co 2.8 Mg 0.2 O 4 possessed a higher defect formation energy and shorter chemical bonds than the pure cobalt oxide , which result in its lower reduction onset temperature and higher energy density. The cost-benefit analysis results showed that Mg-decoration could significantly reduce the area of mirror field and the use of energy storage material for a CSP system.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
Materials Today Energy
·
2022
·
IF 9.257
Changqing Tian,Qiang Huang,Daofu Wu,Junan Lai,Fei Qi,Nan Zhang,Wenxia Zhang,Xiaosheng Tang
The lead halide perovskites have broad application prospects in the fields of optoelectronics and photocatalysis . However, their toxicity and limited stability are the main obstacles restricting their large-scale photocatalytic applications. In order to solve these problems, a set of lead-free stable Cs 2 XCl 6 (X = Hf, Zr, Te) perovskite microcrystals were synthesized via a solvothermal solution. For the first time, the Cs 2 XCl 6 (X = Hf, Zr, Te) perovskite microcrystals were employed as efficient photocatalysts for the conversion of CO 2 into CO and CH 4 . Among them, the Cs 2 TeCl 6 microcrystals showed the best photocatalytic performance under light irradiation for 3 h, while the yields of CO and CH 4 were 284.4 μmol/g and 48.96 μmol/g respectively. Our strategy may provide a new idea for the CO 2 photoreduction based on lead-free halide perovskites.
研究领域:
材料科学
·
光催化
·
环境科学
✓ 已验证
DOI
高影响因子
Biomass Conversion and Biorefinery
·
2024
·
IF 3.5
He Taotao,Wang Fei,Feng Junfeng,Liu Yancong,Chen Yuwei,Guo Feihong,Liu Peng,Jiang Xiaoxiang,Jiang Jianchun
To efficiently convert the microalgae to valuable and renewable fuels, the microalgae oil was first extracted and then transformed into the second-generation biodiesel. Among all solvents that were used for the microalgae oil extraction, the polar single solvent system methanol achieved the optimal value (47.8% extraction yield) because the polar cell membrane was easily dissolved by the polar solvent. Hexadecanoic acid (38.54%) and docosanoic acid (54.39%) dominated in fatty acid of microalgae oil. In the catalytic deoxygenation of microalgae oil, the Co-Al nanosheet displayed a higher performance than Co/Al 2 O 3 because of its high Co content and lamellar structure, exposing massive Co sites with high dispersion and small particle size. Moreover, when the reaction temperature was raised to 240 °C, the 100% conversion and 100% alkane yield were obtained, and the further temperature rise in temperature led to the cracking reaction. Graphical Abstract
研究领域:
生物能源
·
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2021
·Vol. 51
·期 6
·2219-2225
·
IF 4.39
Chen Chen,Jiamei Zhao,Dong Guo,Keyu Duan,Yongqiang Wang,Xiaowen Lun,Conglu Zhang
CaTiO3 is considered to be one of the most promising catalysts for the degradation of organic pollutants, but its application is limited by the wide band gap and low catalytic activity. Element doping is an effective strategy to solve these problems. Herein, a novel CaTiO3 co-doped with Ag and Co (Ca1−xAgxTi1−yCoyO3) was synthesized by combining co-precipitation and the microwave hydrothermal method for the first time. The crystal structure, microstructure and light absorption of the material were systematically investigated. The results showed that Ca1−xAgxTi1−yCoyO3 had higher light absorption than pure CaTiO3, and the band gap was reduced to 2.78 eV. First-principles calculations indicated that Ag–Ca and Co–Ti tended to form donor–acceptor defect pairs in the doping process. These defect states not only enhanced the adsorption properties, but also could be used as carrier traps to optimize the dielectric properties of CaTiO3. In the photoelectrocatalytic system, with 0.01 g of catalyst, 98% of methylene blue in 100 mL solution (10 mg L−1) was degraded in 150 min. In addition, Ca1−xAgxTi1−yCoyO3 showed strong stability and excellent recyclability. The double ion co-doping technology will provide an effective strategy for improving the catalytic activity of traditional wide-band gap semiconductors.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）