RESEARCH ON CHEMICAL INTERMEDIATES
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2025
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IF 3.5
Yang Jie,Fang Hailong,Jiang Huanjin,Wang Wenhao,Chen Jixiang
MgO–Al 2 O 3 -supported metallic Ni and bimetallic Ni–Zn catalysts (referred as Ni/MgAl and Ni x Zn/MgAl with the Ni/Zn atomic ratio of x , respectively) were prepared by the coprecipitation method, and their performance for methane dry reforming (DRM) was tested on an atmospheric quartz fixed-bed. The XRD, magnetic measurement, H 2 -TPR, TEM/EDS and XPS results demonstrate that metallic Ni and Ni–Zn alloy form in Ni/MgAl and Ni x Zn/MgAl, respectively. With reducing the Ni/Zn atomic ratio, the amount of surface Ni sites decreases, while the CO 2 adsorption capacity and strength increase due to the presence of Zn. Ni x Zn/MgAl gives higher activity than Ni/MgAl for DRM, mainly due to the suppression of carbon deposition and graphitization on Ni–Zn alloy and the enhanced adsorption of CO 2 . Under the condition of 800 °C, CH 4 /CO 2 molar ratio of 1 and weight hourly space velocity of 20,000 mL g cat −1 h −1 , Ni/MgAl gives the CH 4 and CO 2 conversions of 76% and 80%, respectively. With decreasing Ni/Zn atomic ratio from 7 to 2, the CH 4 and CO 2 conversions on Ni x Zn/MgAl first increase and then decrease, and Ni 5 Zn/MgAl has the highest activity with the CH 4 and CO 2 conversions of 81% and 87%, respectively. During the time on stream of 100 h at 800 °C, Ni 5 Zn/MgAl exhibits better stability than Ni/MgAl, mainly ascribed to its less amount of filamentous graphite carbon. In all, the formation of Ni–Zn alloy enhances the catalyst activity and remarkably suppresses the graphitization of carbonaceous deposit.
研究领域:
催化化学
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材料科学
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Xifei Yin,Yinghui Sun,Yanbin Zhang,Xiaolong Wang,Ying Li,Tong Xu,Jie Bai
Dry reforming of methane (DRM) is a chemical reaction with great potential to convert CH 4 and CO 2 into valuable syngas. However, catalyst deactivation due to sintering and coking is a major obstacle for practical applications. Here, we synthesized a hollow tubular Ni/La 2 O 3 -ES catalyst via electrospinning (ES) method that surpasses conventional Ni/La 2 O 3 catalysts in both activity and stability. The ES-driven architecture creates confinement-stabilized Ni nanoparticles with improved metal-support interaction and spatial uniformity, achieving 93 % CO 2 conversion and 85.0 % CH 4 conversion at 800 °C for 20 h of continuous operation, providing long-lasting performance with no accumulation of carbon deposition. The carbon removal ability is strengthened in the Ni/La 2 O 3 -ES catalyst as evidenced by the CH 4 -CO 2 -TPSR experiments. Ni/La 2 O 3 -ES catalyst prefer to produce more active intermediates b-HCOO* as indicated in in situ DRIFTS spectra. The b-HCOO* species served as the key reactive intermediate that facilitated both CO 2 activation and the oxidative transformation of CH 4 -derived carbonaceous intermediates on catalytic surface. Additionally, the catalyst prepared by electrospinning method promoted lattice oxygen release and oxygen vacancy formation, thereby exhibiting superior catalytic activity and stability.
研究领域:
催化化学
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能源化学
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材料科学
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表面科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
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2025
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IF 7.2
Yanbin Zhang,Shuowen Guo,Xiaolong Wang,Ying Li,Tong Xu,Yinghui Sun,Jie Bai
Non-noble metal-based catalysts used for dry reforming of methane (DRM) undergo extensive deactivation, mainly because of the carbon deposition. Herein, the conventional NiCo-CNFs catalyst was modified by minor Mo promoter for facilitating CO and H 2 produced from DRM. This not only improves the catalytic stability of the catalyst, with CH 4 conversion up to 97.7 % after 720 min at 850 ℃, but also reduces the generation of carbon deposition. The addition of an appropriate amount of Mo enhanced the metal-support interaction, and formed Mo 2 C in the reaction. The generation of Mo 2 C also provided more active sites for DRM reaction, which is also benefited to NiCoMo 0.1 -CNFs catalyst exhibited optimal activity and stability. The reaction pathway of NiCoMo 0.1 -CNFs catalyst in DRM reaction was elucidated through in-situ DRIFTS, and the activation mechanism of the catalyst for CH 4 and CO 2 was revealed. This study revealed the key role of Mo 2 C, providing a feasible solution for inhibiting carbon deposition and improving the catalytic stability of DRM reactions.
研究领域:
催化化学
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能源材料
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环境催化
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纳米材料科学
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化学工程
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表面科学
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工业催化
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2019
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IF 4.084
Yinghui Sun,Guojie Zhang,Ying Xu,Riguang Zhang
The catalytic activity of DRM reaction over 1M-1Co-1Ce/AC-N (M = Ca and Mg) catalysts was investigated at 800 °C and under atmospheric pressure. By promoting N-doped activated carbon supported Co-Ce catalysts with alkaline-earth metals to obtain catalysts with better catalytic performance is the main purpose of study. The catalysts were prepared by wet-impregnation method and the influence of impregnation sequence on catalytic performance was also studied. The characterization was conducted using TPR, TPD , XPS, TEM and Raman. The catalyst 1Ca-1Co-1Ce/AC-N promoted with Ca and prepared by co-impregnation exhibited higher catalytic activity than unmodified. This was mainly due to the stronger interaction between metal and support as well as better active metals dispersion. The 1Ca-1Co-1Ce/AC-N catalysts also displayed excellent stability and XPS results indicated that higher Ce 3+ /Ce 4+ and O β /(O α +O β ) ratios were observed on this catalyst. However, the catalyst 1Co-1Ce/1Ca/AC-N prepared with sequential impregnation exhibited poor stability. In addition, the TEM of the spent catalysts revealed that there were a large number of carbons were generated on active metal surface.
研究领域:
催化化学
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能源化学
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材料化学
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环境化学
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化学工程
✓ 已验证
DOI
高影响因子
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