Asia-Pacific Journal of Chemical Engineering
·
2017
·Vol. 12
·期 3
·422-431
·
IF 0.836
Yuan Wang,Wei Zhu,Shengya Sang,Lijing Gao,Guomin Xiao
Aqueous-phase processing of biomass-derived furfural is one of the promising ways to convert biomass into useful chemicals. Supported metal catalysts are crucial in the aqueous-phase hydrogenation of furfural. Understanding the effect of acid and basic properties of supports on the performance of the catalysts will help understand the reaction pathways and develop more efficient catalysts. Here, a series of Cu-based catalysts with different supports (Al 2 O 3 , ZnO, SiO 2 , MgO, and ZSM-5) have been investigated in hydrogenation of furfural in aqueous phase. The properties of the supports have been characterized by X-ray diffraction, N 2 adsorption–desorption, transmission electron microscope, H 2 temperature-programmed reduction, and CO 2 and NH 3 temperature-programmed desorption. The results show that pure acid support leads to the formation of oligomers and pure basic support results in furfuryl alcohol as the main product. And the mass balance in reaction system catalyzed by Cu-based catalysts with higher acidity amount is lower. © 2017 Curtin University of Technology and John Wiley & Sons, Ltd.
研究领域:
化学工程
·
催化科学
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产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 27
·70884-70896
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IF 5.8
Li Ke,Zhu Yuqiu,Wang Zixuan,Chen Dingkai,Wu Wenwei,Luo Yongming,He Dedong
High concentration of H 2 S in acidic natural gas will lead to poisoning of catalysts for hydrogen production by methane steam reforming, thus limiting the further use of natural gas. Reforming CH 4 by H 2 S can be considered as an alternative route to hydrogen production from methane. This process not only achieves the removal of H 2 S but also obtains chemical raw material CS 2 and clean energy H 2 . By impregnating the Mo source on SiO 2 treated with hydrogen peroxide and then using the catalyst in the CH 4 /H 2 S reforming reaction, we surprisingly found that the conversion rate of CH 4 and H 2 S increased from 28 and 32% to 34% and 43%, respectively, after hydrogen peroxide treatment. The H 2 production rate and the yield of CS 2 increased from 20 mmolH 2 /(g Mo *min) and 52% to 30 mmolH 2 /(g Mo *min) and 65%, respectively. Combining with characterization methods such as X-ray diffraction (XRD), hydrogen temperature programmed reduction (H 2 -TPR), 1 H-based solid-state nuclear magnetic resonance ( 1 H MAS NMR), X-ray photoelectron spectroscopy (XPS), Raman spectra (RS), and transmission electron microscopy (TEM), we found that the hydroxyl concentration of the support increased after hydrogen peroxide treatment, which led to the strengthening of the force between the metal and the support, which was easy to form low-level and small-size MoS 2 , exposing more active sites, and further improving the catalytic activity. This method provides a new idea for hydrogen production by CH 4 /H 2 S reforming and the development of high-performance MoS 2 -based catalysts.
研究领域:
化学工程
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催化科学
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产品关联
DOI
PubMed
高影响因子
Molecular Catalysis
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2020
·
IF 3.687
Ning Xiang,Xiaojin Han,Yarong Bai,Qiaoyan Li,Jianfeng Zheng,Yulin Li,Yaqin Hou,Zhanggen Huang
Supported noble metal catalysts have been widely utilized for HCHO catalytic oxidation. When the active components are fixed, the altering and regulation of the supports would have a huge effect on catalytic performance. Here, two types of Pd/γ-Al 2 O 3 catalysts with different support size (micro-γ-Al 2 O 3 and nano-γ-Al 2 O 3 , respectively) were fabricated and used for HCHO oxidation. Compared with the micro-sized counterpart, the Pd/nano-γ-Al 2 O 3 catalyst exhibited much superior HCHO oxidation performance which could totally oxidize 160 ppm of HCHO into harmless CO 2 under a WHSV of 100,000 mL g cat −1 h −1 at room temperature. Multiple characterizations including XRD, BET, TEM, CO chemisorption, FT-IR, O 2 -TPD, XPS and in situ DRIFTS were implemented to study the effect of γ-Al 2 O 3 support size on physicochemical properties of Pd/γ-Al 2 O 3 catalysts and elucidate the structure-activity relationship. The results revealed that large specific surface area, rich surface OH groups as well as high curvature of nano-γ-Al 2 O 3 not only facilitated HCHO adsorption, but also stabilized highly dispersed Pd species which then promoted the activation of oxygen and boosted formate species decomposition, and consequently leading to the enhanced HCHO oxidation performance of Pd/nano-γ-Al 2 O 3 . This work deepens the comprehension of support size-dependent activity of Pd/γ-Al 2 O 3 catalysts for HCHO oxidation and provides an alternative method to prepare high-performance Pd catalysts for HCHO oxidation.
研究领域:
催化化学
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环境科学
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产品关联
DOI
高影响因子
ChemCatChem
·
2021
·Vol. 13
·期 15
·3490-3500
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IF 5.686
Mingwei Wu,Wenzhi Li,Xia Zhang,Fengyang Xue,Tao Yang,Liang Yuan
Graphical Methane combustion : Defect-Rich CeO 2 −Al 2 O 3 supported palladium catalysts can prominently improve the dispersion of palladium species and strengthen the concentration of active surface oxygen species, resulting in excellent catalytic activity for methane combustion. In heterogeneous catalysis, the strong interaction between metal and support can significantly modulate the electronic properties of the metals and play a crucial role in metal particle dispersion and morphology. Herein, a facile strategy was utilized to fabricate highly dispersive palladium catalysts supported on defective Al 2 O 3 −CeO 2 for lean methane oxidation. Ceria was immobilized on the coordinatively unsaturated Al 3+ penta sites of γ-alumina activated by pre-reduction to fabricate hybrid-oxide support (abbreviated as RAl 2 O 3 −CeO 2 ), and then Pd precursor was uniformly deposited on the defective surface. Such a RAl 2 O 3 −CeO 2 interface can effectively upgrade the dispersion of deposited palladium species and improve the concentration of reactive oxygen species owing to strong electronic interactions, invoking a superior catalytic activity for lean methane oxidation. After loading 1.0 wt% palladium, Pd/RAl 2 O 3 −CeO 2 exhibited a 90 % methane conversion at 328 °C under the space velocity of 60,000 mL g −1 h −1 , far lower than that of bare 1.0 wt% Pd/RAl 2 O 3 (400 °C). In addition, Pd/RAl 2 O 3 −CeO 2 catalyst showed an excellent hydrothermal stability under the harsh conditions (600 °C, water vapor)for 120 h without obvious deactivation. The reaction pathway of total methane combustion was elucidated by in situ DRIFTS. The crucial intermediate compositions (carbon oxygenates and carbonate)on Pd/RAl 2 O 3 −CeO 2 surface are more readily oxidized into CO 2 and H 2 O. This work provides an effective interface-promoted strategy to develop efficient and durable palladium catalysts for many challenging reactions.
研究领域:
催化化学
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材料科学
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环境工程
✓ 已验证
DOI
高影响因子
MICROCHIMICA ACTA
·
2015
·Vol. 182
·期 15
·2395-2401
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IF 3.741
Mei He,Sheng Qu,Wu Huimin,Zhang Xiuhua,Wang Shengfu,Xia Qinghua
Alloy nanoparticles of the type Pt x Fe (where x is 1, 2 or 3) were synthesized by coreduction with sodium borohydride in the presence of carbon acting as a chemical support. The resulting nanocomposites were characterized by scanning electron microscopy and X-ray diffraction. The nanocomposite was placed on a glassy carbon electrode, and electrochemical measurements indicated an excellent catalytic activity for the oxidation of glucose even a near-neutral pH values and at a working voltage as low as 50 mV (vs. SCE). Under optimized conditions, the sensor responds to glucose in the 10.0 μM to 18.9 mM concentration range and with a 3.0 μM detection limit (at an S/N ratio of 3). Interferences by ascorbic acid, uric acid, fructose, acetamidophenol and chloride ions are negligible.
Nonenzymatic sensing of glucose is demonstrated at neutral pH values and low working potential using a glassy carbon electrode modified with platinum-iron alloy nanoparticles on a carbon support.
研究领域:
生物化学
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材料科学
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR CATALYSIS B-ENZYMATIC
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2015
·
IF 2.128
Chuan-Yang Shang,Wei-Xun Li,Feng Jiang,Rui-Feng Zhang
ZnO nanowires/macroporous SiO 2 composites were used as a new type of microwave absorbing support to immobilize Candida rugosa lipase (CRL). Under microwave irradiation the immobilized lipase was used to catalyze esterification of phytosterol and oleic acid for the synthesis of phytosterol esters. A great improvement of the catalytic activity was found in the systems in which composited ZnO nanowires were present. The microwave absorbing properties of ZnO nanowires have been proved to be helpful for the synergistic effect between microwave irradiation and enzyme catalysis. The immobilized CRL showed higher thermal stability at 55 °C under microwave irradiation than conventional heating. A maximum molar conversion of 95.4% under microwave irradiation was achieved under the optimal condition: 0.1 M phytosterol, 0.2 M oleic acid, water activity ( a w ) of 0.11, reaction temperature at 50 °C and reaction time of 1 h.
研究领域:
生物化学
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酶工程
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纳米材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Catalysis
·
2020
·
IF 12.35
Qingsong Zhang,Jiahao Bu,Jiandian Wang,Changyong Sun,Dongyang Zhao,Guangzhe Sheng,Xiaowei Xie,Ming Sun,Lin Yu
Pt/CeO2 catalysts with different support shapes and prereduction temperatures were prepared and tested in the liquid-phase hydrogenation of nitrobenzene. Detailed characterizations reveal that the support shape effect of Pt/CeO2 catalysts on nitrobenzene hydrogenation originates from the exposed crystal planes on CeO2 with different reducibilities. A high-energy surface is readily reduced to generate more Ce3+ surface sites and oxygen vacancies, not only favoring the dispersion and stabilization of Pt species due to stronger metal–support interaction but also providing more adsorption sites for reactants and intermediates. Reduction treatment at high temperatures has been proved to be an effective way to improve the performance of Pt/CeO2 catalysts by providing additional Ce3+ surface sites and high H-spillover capability. The additional Ce3+ far away from Pt, derived from a high-temperature reduction, can adsorb the N-phenylhydroxylamine intermediate more effectively due to its stronger electron-donating ability and in turn promote aniline formation. It is also found that Na ions with suitable content facilitate the generation and stabilization of surface Ce3+ by charge transfer and help Pt particles to maintain a smaller size. Consequently, a 0.25 wt % Pt catalyst, supported on Na-containing CeO2 nanorods and reduced at 600 °C, displays a high level of aniline productivity of 40.8 molAN/gPt/h and excellent stability in nitrobenzene hydrogenation at room temperature. A pathway of nitrobenzene hydrogenation catalyzed by Pt/CeO2 is also proposed.
研究领域:
催化化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Junshan Li,Xijun Xu,Xiaoting Yu,Xu Han,Ting Zhang,Yong Zuo,Chaoqi Zhang,Dawei Yang,Xiang Wang,Zhishan Luo,Jordi Arbiol,Jordi Llorca,Jun Liu,Andreu Cabot
Monodisperse CoSn and NiSn nanoparticles were prepared in solution and supported on commercial carbon black. The obtained nanocomposites were applied as anodes for Li- and K-ion batteries. CoSn@C delivered stable average capacities of 850, 650, and 500 mAh g–1 at 0.2, 1.0, and 2.0 A g–1, respectively, well above those of commercial graphite anodes. The capacity of NiSn@C retained up to 575 mAh g–1 at a current of 1.0 A g–1 over 200 continuous cycles. Up to 74.5 and 69.7% pseudocapacitance contributions for Li-ion batteries were measured for CoSn@C and NiSn@C, respectively, at 1.0 mV s–1. CoSn@C was further tested in full-cell lithium-ion batteries with a LiFePO4 cathode to yield a stable capacity of 350 mAh g–1 at a rate of 0.2 A g–1. As electrode in K-ion batteries, CoSn@C composites presented a stable capacity of around 200 mAh g–1 at 0.2 A g–1 over 400 continuous cycles, and NiSn@C delivered a lower capacity of around 100 mAh g–1 over 300 cycles.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
Science Advances
·
2025
·Vol. 11
·期 10
·
IF 12.5
Zhongliang Huang,Qi Xiao,Tianyi Ding,Jing Xia,Changhong Zhan,Xiangmin Meng,Chih-Wen Pao,Zhiwei Hu,Wei-Hsiang Huang,Yingru Wang,Nanjun Chen,Liang Cao,Xiaoqing Huang
Platinum (Pt) has been documented as the top-tier fuel cell catalyst, yet it faces a notable challenge regarding its poor CO tolerance and sluggish oxygen reduction reaction (ORR) in proton exchange membrane fuel cells (PEMFCs), particularly when using CO-contaminated blue and gray H2. Here, we present an interfacial metal coordination strategy to design a bifunctional platinum-cobalt (PtCo) intermetallic catalyst integrated with a tin-nitrogen-carbon (Sn–N–C) support, which forms Pt–Sn–N bonds that substantially boost both ORR activity and CO tolerance. The PtCo/Sn–N–C-made fuel cell achieves a topmost peak power density of 2.11 watts per square centimeter in 100 parts per million (ppm) of CO-containing H2, surpassing all previously reported PEMFCs. In addition, it operates stably at a rated voltage for over 710 hours in 100 ppm of CO/H2-air. This work demonstrates the feasibility of fuel cells directly using CO-contaminated gray & blue H2, paving the way for PEMFC-driven energy vehicles.
研究领域:
材料科学
·
能源工程
·
催化化学
✓ 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）