Promoted propane dehydrogenation over Pt-In intermetallics via classic strong metal-support interaction

IF 11.5 Q1 CHEMISTRY, PHYSICAL

Chem Catalysis Pub Date : 2024-12-16 DOI:10.1016/j.checat.2024.101198

Ya Pan, Chunlan Qin, Ruichao Xu, Liuxin Xu, Shanshan Ruan, Xu Zhang, Kun Zheng, Xiao Han, Jinglin Yuan, Yanna Shui, Lidong Zhang, Zhihu Sun

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Abstract

The classic strong metal-support interaction (SMSI), characterized by the encapsulation of metal nanoparticles within suboxide layers, is a promising strategy for designing robust catalysts. However, applying this strategy to the high-temperature propane dehydrogenation (PDH) process, which is an important petrochemical process for the industrial production of propylene, is rarely reported. Herein, we demonstrate an SMSI-type PDH catalyst, composed of subnanometric Pt₂In₃ clusters encapsulated by an In₂O_3-x overlayer, exhibiting high stability and selectivity. During a 160-h on-stream test, it showed a slight activity decline (k_d = 0.002 h⁻¹) and maintained 99.5% propylene selectivity. The excellent performance is attributed to the dual role of the In₂O_3-x overlayer, which not only prevents the sintering of the Pt₂In₃ clusters but also modifies the electronic structure of Pt atoms via interfacial interaction, thus facilitating the generation and propylene desorption. Meanwhile, the Pt₂In₃ intermetallics disrupt large Pt ensembles and introduce electron-rich Pt atoms, suppressing side reactions and enhancing propylene desorption.

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通过经典的强金属支撑相互作用促进Pt-In金属间化合物上丙烷脱氢

经典的强金属-载体相互作用（SMSI），其特征是将金属纳米颗粒封装在亚氧化物层中，是设计强催化剂的一种很有前途的策略。然而，将该策略应用于高温丙烷脱氢（PDH）工艺，这是工业生产丙烯的重要石化工艺，很少有报道。在此，我们展示了一种smsi型PDH催化剂，由亚纳米级Pt2In3簇组成，由In2O3-x覆盖层包裹，具有高稳定性和选择性。在160小时的工艺测试中，该酶活性略有下降（kd = 0.002 h−1），丙烯选择性保持在99.5%。这种优异的性能归功于In2O3-x包覆层的双重作用，它不仅阻止了Pt2In3簇的烧结，而且通过界面相互作用改变了Pt原子的电子结构，从而促进了丙烯的生成和解吸。同时，Pt2In3金属间化合物破坏了大的Pt系综，引入了富电子的Pt原子，抑制了副反应，增强了丙烯的脱附。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Chem Catalysis

CiteScore

10.50

自引率

6.40%

发文量

期刊介绍： Chem Catalysis is a monthly journal that publishes innovative research on fundamental and applied catalysis, providing a platform for researchers across chemistry, chemical engineering, and related fields. It serves as a premier resource for scientists and engineers in academia and industry, covering heterogeneous, homogeneous, and biocatalysis. Emphasizing transformative methods and technologies, the journal aims to advance understanding, introduce novel catalysts, and connect fundamental insights to real-world applications for societal benefit.