CHINESE JOURNAL OF CHEMISTRY
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2021
·Vol. 40
·期 8
·918-924
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IF 6
Jisheng Xu,Chengxiang Shi,Shuguang Zhang,Qiancheng Zheng,Lun Pan,Xiangwen Zhang,Ji-Jun Zou
Comprehensive Summary Non-oxidative ethane dehydrogenation is a promising route to produce ethene. Herein, PtSn supported catalysts were investigated to achieve better ethane dehydrogenation performance by introduction of different Zr promoters, i.e. , framework Zr and ZrO 2 , to mesoporous MCM-41. In-situ XRD, TEM and CO chemisorption show that aggregation of metal particles and phase segregation of Pt 3 Sn to Pt and PtSn 3 at high temperature occur for PtSn/M, leading to bad ethane dehydrogenation activity. Strong interaction between ZrO 2 and PtSn species, as proved by XPS, results in restrained metal particles, which promotes the initial reactivity. However, Pt phase generated on surface is disadvantageous for the desorption of produced ethene as indicated by CO-IR and C 3 H 6 -TPD, and pyridine-IR and NH 3 -TPD indicate strong acidity generated. Both deactivate the catalyst rapidly by deep dehydrogenation and coking. Moderate interaction between PtSn species and Si-O-Zr with much weaker acidity is formed when framework Zr is incorporated into MCM-41, which benefits the dispersion of metal particles, formation of Pt 3 Sn/Pt species and stabilization of metal species from phase segregation. Outstanding initial ethane conversion and ethene selectivity of ca. 99% were achieved for the optimal PtSn/ZrM, which is more coking-tolerant and stable by generating graphitic carbon mainly on support instead of active metals.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 3
·417
·
IF 5.719
Li Wang,Guo-Qing Yang,Xing Ren,Zhong-Wen Liu
The oxidative dehydrogenation of propane with CO2(CO2-ODP) has been extensively investigated as a promising green technology for the efficient production of propylene, but the lack of a high-performance catalyst is still one of the main challenges for its industrial application. In this work, an efficient catalyst for CO2-ODP was developed by adding CeO2to PtSn/SiO2as a promoter via the simple impregnation method. Reaction results indicate that the addition of CeO2significantly improved the catalytic activity and propylene selectivity of the PtSn/SiO2catalyst, and the highest space-time yield of 1.75 g(C3H6)·g(catalyst)−1·h−1was achieved over PtSn/SiO2with a Ce loading of 6 wt%. The correlation of the reaction results with the characterization data reveals that the introduction of CeO2into PtSn/SiO2not only improved the Pt dispersion but also regulated the interaction between Pt and Sn species. Thus, the essential reason for the promotional effect of CeO2on CO2-ODP performance was rationally ascribed to the enhanced adsorption of propane and CO2originating from the rich oxygen defects of CeO2. These important understandings are applicable in further screening of promoters for the development of a high-performance Pt-based catalyst for CO2-ODP.Keywords:oxidative dehydrogenation;propane;carbon dioxide;supported PtSn catalyst;ceria
研究领域:
催化
·
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Molecular Catalysis
·
2025
·
IF 4.9
Rong Chen,Peng Wang,Lizhi Wu,Li Tan,Yu Tang
PtSn bimetallic catalysts applied in propane dehydrogenation (PDH) reaction suffer from deactivation at high temperatures (500–700 °C) due to metal segregation and Sn-rich cluster formation. This study demonstrates that supporting PtSn catalysts on Silicalite-1 zeolite (S-1) enhances Sn dispersion through interactions with silanol hydroxyl groups, enabling effective regeneration of Pt-rich PtSn clusters even after 15 reaction-regeneration cycles. Comprehensive characterizations reveal that silanol nests play a critical role in redispersing metal species during regeneration, minimizing aggregation, and maintaining catalytic activity. The enhanced metal-support interactions significantly improve catalyst regenerability and stability, addressing key challenges in industrial PDH processes. This work highlights the importance of Sn dispersion and metal-support interactions in designing durable and efficient PtSn catalysts, offering practical insights for sustainable propylene production.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Chaokai Xu,Shengdong Tan,Yaxin Tang,Shibo Xi,Bingqing Yao,Austin Wade,Binbin Zhao,Shangchen Lu,Yankun Du,Mingjiao Tian,Chi He,Lu Ma,Xingjie Fu,Jiwei Shi,Jiong Lu,Alexander G.R. Howe,Sheng Dai,Guangfu Luo,Qian He
We investigated the industrially important PtSn/Al 2 O 3 catalysts prepared with uniform particle sizes (∼ 1 nm) and varied compositions using molecular complexes of Pt(II) and Sn(II). Our best catalyst, with a Sn:Pt ratio of around 2, exhibited a high initial propylene productivity of about 1.1 mol C 3 H 6 (g catalyst) −1 h −1 . Elaborate electron microscopy studies revealed significant compositional variations in the catalyst, highlighting the practical challenges in achieving or confirming the theoretically predicted optimum Sn:Pt ratio. It is also found that the catalytic activities correlate well with the Pt dispersion, suggesting the structure-insensitive nature of the dehydrogenation reaction applies to these ultrasmall Pt-Sn nanoparticles . The presence of Pt-rich particles in the catalysts did not produce noticeable degradations in the reaction selectivity, indicating a wide composition range for Pt-Sn nanoparticles to be effective at the 1 nm size range. These findings emphasize the importance of detailed analysis of compositional distributions for understanding and optimizing nanoalloys.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
CHINESE CHEMICAL LETTERS
·
2020
·
IF 4.632
Yue Sun,Haiyan Xiang,Huimin Li,Gang Yu,Hong Chen,Song Liu
ABSTRACT In addition to the theoretical research, direct ethanol fuel cells have great potential in practical applications. The performance of direct ethanol fuel cells largely depends on the electrocatalysts. Pt-based electrocatalysts have been promising candidates for advancing direct ethanol fuel cells for its high catalytic activity and great durability. Here, a PtSn catalyst with unique three-dimensional porous nanostructure has been designed and synthesized via a two-step liquid phase reduction reaction. Sn formed a self-supporting framework in PtSn alloy particles (∼3.5 nm). In ethanol electro-oxidation reaction, the PtSn catalyst exhibited high mass activity and excellent recycling time compared with that of Pt/C. After the morphology characterization before and after potential cycling, the PtSn alloy-based nano-catalyst showed good stability. The PtSn catalysts effectively avoid structural instability due to the external carriers, and prolong the leaching time of Sn. In addition, the introduction of a certain amount of Sn can also solve the poisoning phenomenon of active sites on Pt surface. The design strategy of porous alloy nano-catalyst sheds light on its applications in direct ethanol fuel cells.
研究领域:
材料科学
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燃料电池研究
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电催化领域
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Xiaoxia Jia,Qiangqiang Guan,Yang Chen,Yong Wang,Qiang Zhao,Jinping Li
Rational design support materials are important for improving the efficiency of Pt-based catalysts. A series of PTI-graphene hybrids supported Pt Sn catalysts with different PTI nanosheets contents were synthesized by polyol method . Physical characterization revealed that PTI nanosheets can prevent restacking of graphene nanosheets and Pt Sn nanoparticles around 2.5 nm are dispersed uniformly on PTI-graphene support materials. Compared with the graphene supported Pt Sn catalyst and commercial carbon black supported Pt catalyst, the PTI-graphene hybrids supported Pt Sn catalysts exhibit excellent ultraefficient performance toward ethanol oxidation reaction (EOR). The enhanced electrochemical activity can be attributed to the high specific surface area of the PTI-graphene supports and the strong interaction between Pt Sn atom and supports as a result of the incorporation of PTI nanosheets.
研究领域:
材料科学
·
电化学
·
催化科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2018
·
IF 4.229
Jing Yan,Weiyan Wang,Lei Miao,Kui Wu,Guolei Chen,Yanping Huang,Yunquan Yang
In this study, Mg Al layered double hydroxides were used as support precursors for the preparation of Pt Sn/Mg Al mixed metal oxides (Pt Sn/Mg Al) catalysts. The resultant catalysts were characterized by many techniques. The addition of Sn and high reduction temperature increased the Pt particle size. In the dehydrogenation of methylcyclohexane, the products were hydrogen and toluene. The introduction of Sn into Pt supported catalyst significantly improved the dehydrogenation activity. When Sn content was 0.5 wt % and Mg Al mixed metal oxides was used as a starting support, 90.5% conversion and 262.1 mmol/g met /min H 2 evolution rate were obtained at 300 °C. Moreover, these Pt Sn/Mg Al catalysts presented high anti-coking ability and good stability. No carbon deposition and conversion reduction were observed after the dehydrogenation reaction for 10 h.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2019
·
IF 4.507
Xiaoping Wu,Qiao Zhang,Lungang Chen,Qiying Liu,Xinghua Zhang,Qi Zhang,Longlong Ma,Chenguang Wang
The development of thermally stable Pt-based catalysts with superior performance for propane dehydrogenation reactions remains a daunting challenge. In this study, a series of PtSn-Mg(Zn)AlO catalysts with different Zn and Pt contents were synthesized by the anion-exchange method for the propane dehydrogenation reaction. To investigate the influence of Zn on the reaction performance and the catalyst structure, the prepared catalysts were characterized with several analytical techniques, including XRD , TEM, HRTEM, H 2 -TPD and CO pulse chemisorption . A good propane conversion (initially higher than 55% and averaging 45.2% over a period of 2 h) and propene selectivity (higher than 99%) were obtained experimentally with PtSn-Mg(3Zn)AlO at 550 °C. The results demonstrated that Pt provided the active sites and that Zn was a promoter. The HRTEM and CO pulse chemisorption results indicated that the addition of Zn to the PtSn-MgAlO catalyst can stabilize the dispersion of metal particles and thus inhibit the sintering of Pt particles. Furthermore, the activities of the used catalysts were almost recovered through reaction-regeneration cycles with the burning-off of coke during five cycles.
研究领域:
催化
·
化工
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）