Controllable Encapsulation of Highly Dispersed Pt Clusters in Beta Zeolites

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters Pub Date : 2025-06-25 DOI:10.1007/s10562-025-05093-7

Xin Jiang, Ye Yang, Zhangbing Zhou, Hanbing Song, Jialing Wang, Yucai Qin, Lijuan Song

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引用次数: 0

Abstract

Metal clusters encapsulated within zeolites are widely utilized in various catalytic processes due to their high metal dispersion and excellent stability. However, the limited and uncontrollable encapsulation of metal content poses significant challenges for further development. To address this issue, this study introduces Sn²⁺ into the framework of Beta zeolite to achieve controlled encapsulation of Pt clusters. Multiple characterizations reveal that the Sn species occupy some of the silanol sites or substitute framework Al³⁺ species within the Beta zeolite, predominantly existing in the form of Sn-O-Si. These framework Sn species effectively stabilize the Pt clusters, thereby not only enhancing the dispersion of Pt clusters but also increasing the encapsulation capacity of the Beta zeolite for Pt clusters. By adjusting the amount of Sn added, precise control over the content of encapsulated Pt species in the Beta zeolite can be achieved. Both excessive and insufficient amounts of Sn are detrimental to the encapsulation of Pt clusters, with the optimal encapsulation effect observed when the Pt to Sn ratio is 1:2. This synthesis strategy has been successfully extended to the preparation of Pt clusters encapsulated in Beta zeolite without Al addition. The prepared catalyst demonstrates excellent catalytic activity and remarkable stability in propane dehydrogenation. These findings provide valuable theoretical insights for the design and development of the zeolite-encapsulated metal cluster catalysts.

Graphical Abstract

The controllable encapsulation of Pt clusters within Beta zeolites was achieved by controlling the incorporation of Sn species into the Beta zeolite framework

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高分散铂簇在沸石中的可控包封

沸石内包裹的金属团簇由于其高分散性和优异的稳定性，被广泛应用于各种催化过程中。然而，金属含量的有限和不可控封装给进一步的发展带来了重大挑战。为了解决这一问题，本研究将Sn2+引入β分子筛的框架中，实现Pt簇的可控封装。多重表征表明，Sn种占据了β沸石中的一些硅醇位点或替代框架Al³+种，主要以Sn- o - si的形式存在。这些骨架锡有效地稳定了Pt团簇，从而增强了Pt团簇的分散性，也增加了β沸石对Pt团簇的包封能力。通过调整锡的添加量，可以实现对β沸石中包被铂的含量的精确控制。锡的过量和不足都不利于铂簇的包封，当锡铂比为1:2时包封效果最佳。该合成策略已成功推广到不添加铝的β沸石包封Pt簇的制备。制备的催化剂在丙烷脱氢过程中表现出良好的催化活性和稳定性。这些发现为沸石包封金属团簇催化剂的设计和开发提供了有价值的理论见解。摘要通过控制Sn在沸石骨架中的掺入，实现了Pt簇在沸石中的可控包封

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来源期刊

Catalysis Letters 化学-物理化学

CiteScore

5.70

自引率

3.60%

发文量

327

审稿时长

1 months

期刊介绍： Catalysis Letters aim is the rapid publication of outstanding and high-impact original research articles in catalysis. The scope of the journal covers a broad range of topics in all fields of both applied and theoretical catalysis, including heterogeneous, homogeneous and biocatalysis. The high-quality original research articles published in Catalysis Letters are subject to rigorous peer review. Accepted papers are published online first and subsequently in print issues. All contributions must include a graphical abstract. Manuscripts should be written in English and the responsibility lies with the authors to ensure that they are grammatically and linguistically correct. Authors for whom English is not the working language are encouraged to consider using a professional language-editing service before submitting their manuscripts.