JOURNAL OF SOLID STATE CHEMISTRY
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2022
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IF 3.656
Ying Yan,Zijian Wang,Ting Ding,Huiping Zhang
Co 3 O 4 catalysts supported on paper-like stainless steel fibers (PSSF) were prepared by MOFs-templated (M) method and applied for catalytic combustion of isopropanol. Physicochemical properties of the as-synthesized Co 3 O 4 catalysts were investigated by SEM, EDS mapping, TEM, XRD , BET, XPS and H 2 -TPR, respectively. Characterization results of SEM and TEM shown that Co 3 O 4 (M)-350 and Co 3 O 4 (M)-400 still remained the dodecahedron shape of the ZIF-67 precursor and possessed porous structures. The XPS results shown that the ratio of Co 3+ /Co 2+ and O c /O c + O a + O l firstly increased and then decreased with the increase of calcination temperature. Among the as-synthesized catalysts, Co 3 O 4 (M)-400 exhibited the highest activity for the catalytic combustion of isopropanol with the T 50 and T 90 values of 258 °C and 281 °C, respectively, which was associated with high BET surface area, high amount of Co 3+ species and abundant surface chemisorbed oxygen. Moreover, Co 3 O 4 (M)-400 was employed as a structured catalyst for isopropanol combustion, the catalytic kinetics were studied based on different feed concentration, bed height and GHSV. The experimental results indicated that the T 50 and T 90 of isopropanol combustion over Co 3 O 4 (M)-400 with the bed height of 2 cm were increased slightly as the GHSV and feed concentration of isopropanol increased.
研究领域:
化学工程
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催化材料科学
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Lulu Guo,Zhen Shen,Chunhui Ma,Chunqiang Ma,Jiaqi Wang,Tingxun Yuan
The development of high response, low detection limit and low-cost acetone sensors remains a great challenge so far. In this work, the high-performance acetone sensors based on Au nanoparticles (NPs)-loaded SnO 2 porous nanosheets were successfully synthesized via metal-organic frameworks (MOFs) template method, which synthesis method is facile and meets the requirements of large-scale production. The acetone sensing characteristics of pristine SnO 2 and Au-SnO 2 -based sensors are investigated. The optimized Au-SnO 2 -based sensor exhibits high response to acetone (R a /R g = 18.2 @100 ppm at 240 °C) with high selectivity and fast response/recovery time compared with that of pristine SnO 2 . Importantly, a fully reversible resistance signal with a low acetone concentration (1 ppm) can be detected, and the theoretical detection limit of the sensor is as low as 40 ppb. Finally, the enhanced acetone sensing performance of the Au-SnO 2 sensor can be attributed to the increased specific surface area and chemically adsorbed oxygen, as well as the formation of Schottky junction between the Au and SnO 2 interfaces.
研究领域:
材料科学
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化学传感器
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2022
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IF 5.089
Weizuo Li,Jing Wang,Dafang He,Guangyu He,Haiqun Chen
Developing highly efficient MOFs derived alloy catalysts for the one-pot tandem catalytic reactions remains a challenge. In this work, a novel solid-solution confined NiCo alloy catalyst incorporating carbon (termed as NiCo/MgO-C) with banana-like morphology has been synthesized via a self-templating strategy for directing pyrolysis of well-defined Ni-Co-Mg tri-metallic MOFs (termed as Ni-Co-Mg@H 2 dhbdc, H 2 dhbdc represents 2,5-dihydroxytelephthalic acid organic linker). The developed NiCo/MgO-C catalyst was applied for the hydrogenation-alkylation tandem catalytic reaction. Owing to the unique structural (e.g., highly dispersed, small size of NiCo nanoparticles, enhanced transfer of electron density) as well as NiCo alloy advantages, the developed NiCo/MgO-C catalyst derived from Ni-Co-Mg@H 2 dhbdc MOFs delivers excellent superior catalytic performance for the hydrogenation-alkylation tandem reaction to those of bimetallic MOFs (Ni-Mg@H 2 dhbdc and Co-Mg@H 2 dhbdc, respectively) derived catalysts (Ni/MgO-C and Co/MgO-C, respectively). Notably, the tri-metallic Ni-Co-Mg@H 2 dhbdc served as the precursor for synthesis of developed catalyst could enhance the reduction degree of NiO/CoO species confined in NiO CoO-MgO solid-solution during the pyrolysis process to some extent. Therefore, we anticipated that this tri-metallic MOFs-templated strategy may provide a facile and controllable way for synthesis of solid-solution supported nanoalloy catalysts for the other heterogeneous catalytic reactions.
研究领域:
材料科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
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2024
·Vol. 191
·期 5
·1-12
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IF 5.3
Wei Zhanxiang,Qin Cong,Yang Xuhui,Zhu Linghao,Zhao Xiaoyan,Cao Jianliang,Wang Yan
Abstract The detection of hazardous CO gas is an important research content in the domain of the Internet of Things (IoT). Herein, we introduced a facile metal-organic frameworks (MOFs)-templated strategy to synthesize Cd-doped Co 3 O 4 nanosheets (Cd-Co 3 O 4 NSs) aimed at boosting the CO-sensing performance. The synthesized Cd-Co 3 O 4 NSs feature a multihole nanomeshes structure and a large specific surface area (106.579 m 2 ·g -1 ), which endows the sensing materials with favorable gas diffusion and interaction ability. Furthermore, compared with unadulterated Co 3 O 4 , the 2 mol % Cd-doped Co 3 O 4 (2% Cd-Co 3 O 4 ) sensor exhibits enhanced sensitivity (244%) to 100 ppm CO at 200 °C and a comparatively low experimental limit of detection (0.5 ppm/experimental value). The 2% Cd-Co 3 O 4 NSs show good selectivity, reproducibility, and long-term stability. The improved CO sensitivity signal is probably owing to the stable nanomeshes construction, high surface area, and rich oxygen vacancies caused by cadmium doping. This study presents a facile avenue to promote the sensing performance of p-type metal oxide semiconductors by enhancing the surface activity of Co 3 O 4 combined with morphology control and component regulation. Graphical Abstract
研究领域:
材料科学
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传感器技术
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纳米技术
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环境监测
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物联网(IoT)
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产品关联
DOI
PubMed
高影响因子
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