Chemical Insight into the Structure and Formation of Coke on PtSn Alloy during Propane Dehydrogenation

Wang, Zhe; Chen, Yuzhuo; Mao, Shanjun; Wu, Ke‐Jun; Zhang, Kaichao; Li, Qichuan; Wang, Yong

doi:10.1002/adsu.202000092

Cited by 29 publications

(31 citation statements)

References 30 publications

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“…The proportion of each kind of coke and species under their reaction condition were given, and the aliphatic cokes take up the larger part of coke deposition, with the ratio of C/H around 1.5. However, a coke hydrogenation study indicated that the species of coke deposition vary on different catalysts . It is suggested that the species could be atomic carbon or aromatics on Pt/Al 2 O 3 and C 3 species on PtSn/Al 2 O 3 catalyst, respectively.…”

Section: The Acquaintance Of Cokementioning

confidence: 99%

“…As mentioned in section 2.1, adding promoter is one of the most effective methods to modify the nature of Pt catalyst. Tin is the most widely applied promoter for Pt, which has enhanced improvements in many reports. ,,,− The main effect of Sn is to improve the selectivity and stability as shown in entries 1–3 of Table . Moreover, the coke precursor adsorbed weakly on PtSn, which enables the easy transfer from metal to support .…”

Section: Suppression and Elimination Of Coke Depositionmentioning

confidence: 99%

“…However, a coke hydrogenation study indicated that the species of coke deposition vary on different catalysts. 40 It is suggested that the species could be atomic carbon or aromatics on Pt/Al 2 O 3 and C 3 species on PtSn/Al 2 O 3 catalyst, respectively. Overall, the composition of cokes varies with reaction condition and catalytic system without a universal definition.…”

Section: The Acquaintance Of Cokementioning

confidence: 99%

See 2 more Smart Citations

Coke Deposition on Pt-Based Catalysts in Propane Direct Dehydrogenation: Kinetics, Suppression, and Elimination

Lian

Jan

et al. 2021

ACS Catal.

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Pt-based catalysts are widely used in propane dehydrogenation to meet the dramatically increased demand of propylene from an on-purpose catalytic process. Although the process has been commercialized with high selectivity for decades, the prevention of coke deposition is still a daunting challenge. Herein, in order to provide a full coverage of the impact of coke deposition, we critically analyze the process of coke formation on Pt-based catalyst. First, the intrinsic nature of coke, including composition, distribution, and effects, is presented. The developments of kinetics model of coke growth are discussed and compared to offer insight into mechanism of coke formation. Moreover, the focus is put on the ways to prevent coke, which included cofeeding reductant gas, promoter, and support engineering. The advantage and limitation of each method is well elaborated, and the unique working principle behind each prevention method is uncovered. The new developments of single atom/site and confined metal cluster strategies are indicated. The regeneration of the deactivated catalyst is also discussed, which has a direct influence on the coke elimination and metal dispersion. In the end, the possible optimization strategies are suggested for the future Pt catalyst rational design. The current work provides a comprehensive summary of the coke formation, which lays out a solid and essential base for the further developments of Pt catalysts in propane direct dehydrogenation.

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Section: The Acquaintance Of Cokementioning

confidence: 99%

Section: Suppression and Elimination Of Coke Depositionmentioning

confidence: 99%

Section: The Acquaintance Of Cokementioning

confidence: 99%

See 1 more Smart Citation

Coke Deposition on Pt-Based Catalysts in Propane Direct Dehydrogenation: Kinetics, Suppression, and Elimination

Lian

Jan

et al. 2021

ACS Catal.

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“…Pt-Sn is one of the most promising catalytic systems, the performance of which is strongly dependent on its structure. Sn can promote the separation of multifold Pt sites and donate electrons to Pt; comparative studies between Pt/Al 2 O 3 and PtSn/Al 2 O 3 highlight, in the case of bimetallic catalyst, a significantly higher propylene selectivity and only traces of cracking products [35]. In fact, the multifold Pt (111) sites are more active towards the breaking of C-C bonds than the PtSn (102).…”

Section: Bimetallic and Promoted Catalystsmentioning

confidence: 99%

Propylene Synthesis: Recent Advances in the Use of Pt-Based Catalysts for Propane Dehydrogenation Reaction

et al. 2021

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Propylene is one of the most important feedstocks in the chemical industry, as it is used in the production of widely diffused materials such as polypropylene. Conventionally, propylene is obtained by cracking petroleum-derived naphtha and is a by-product of ethylene production. To ensure adequate propylene production, an alternative is needed, and propane dehydrogenation is considered the most interesting process. In literature, the catalysts that have shown the best performance in the dehydrogenation reaction are Cr-based and Pt-based. Chromium has the non-negligible disadvantage of toxicity; on the other hand, platinum shows several advantages, such as a higher reaction rate and stability. This review article summarizes the latest published results on the use of platinum-based catalysts for the propane dehydrogenation reaction. The manuscript is based on relevant articles from the past three years and mainly focuses on how both promoters and supports may affect the catalytic activity. The published results clearly show the crucial importance of the choice of the support, as not only the use of promoters but also the use of supports with tuned acid/base properties and particular shape can suppress the formation of coke and prevent the deep dehydrogenation of propylene.

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“…Isolation of Pt atoms is an efficient strategy to inhibit the undesirable side reactions of PDH. Pt–Pt ensembles can be diluted, and propylene selectivity and catalyst stability can be enhanced when alloyed with certain inactive metals such as Sn, − Ga, − Zn, , In, , Cu, , Ni, and Ge. , These bimetallic catalysts have been studied to improve catalytic performance, among which Pt–Sn catalyst is the most classic example.…”

Section: Introductionmentioning

confidence: 99%

Mesoporous Silica SBA-15 Supported Pt–Ga Nanoalloys as an Active and Stable Catalyst for Propane Dehydrogenation

Qiao

Liu

et al. 2022

Ind. Eng. Chem. Res.

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Propane dehydrogenation is one of the most admired technologies for propylene production. However, the development of an active and stable catalyst presents a significant challenge. In this study, Pt−Ga/SBA-15 catalysts were prepared via coimpregnation, followed by H 2 reduction, and applied in propane dehydrogenation. The Pt−Ga/SBA-15 catalyst with a Ga/Pt molar ratio of 1 exhibited a high propane conversion of up to 60% and high selectivity toward propylene of 98.2% at 550 °C for 10 min, with a propane conversion of 51.6% and propylene selectivity of 99.5% after reaction for 25 h. The physicochemical properties characterized using N 2 physisorption, XRD, TEM, XPS, CO chemisorption, and in situ CO−DRIFT spectroscopy reveal that the Pt−Ga alloy nanoparticles were formed on the SBA-15 support after direct reduction with H 2 . The study of coke formation via temperature-programmed oxidation showed that a large amount of coke was deposited over the support of spent Pt−Ga/SBA-15 catalyst, indicating coke mobility from the active sites to the supports and its contribution to catalyst stability. The activities of spent catalysts could be almost completely recovered via reduction regeneration, during which Pt−Ga alloy retains the original geometrical and electronic structure well. The dilution of Pt ensembles due to the addition of Ga, e.g., Pt−Ga alloy formation, plays an important role in enhancing the catalytic performance for propane dehydrogenation.

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Chemical Insight into the Structure and Formation of Coke on PtSn Alloy during Propane Dehydrogenation

Cited by 29 publications

References 30 publications

Coke Deposition on Pt-Based Catalysts in Propane Direct Dehydrogenation: Kinetics, Suppression, and Elimination

Coke Deposition on Pt-Based Catalysts in Propane Direct Dehydrogenation: Kinetics, Suppression, and Elimination

Propylene Synthesis: Recent Advances in the Use of Pt-Based Catalysts for Propane Dehydrogenation Reaction

Mesoporous Silica SBA-15 Supported Pt–Ga Nanoalloys as an Active and Stable Catalyst for Propane Dehydrogenation

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