Anatase-reinforced PtZn@Silicalite-1 structured catalysts boosting propane dehydrogenation

IF 3.5 3区工程技术 Q2 ENGINEERING, CHEMICAL

AIChE Journal Pub Date : 2024-11-16 DOI:10.1002/aic.18650

Liming Xia, Bofeng Zhang, Gang Hou, Shuo Zhang, Li Wang, Guozhu Liu

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引用次数: 0

Abstract

Structured catalysts exhibit the advantages of high diffusion efficiency and low heat transfer resistance, which have attracted increasing attention to non-adiabatic gas–solid process. However, the metal-supported coating catalysts face the problems of weaker bond strength and severe sintering, especially under the conditions of large flow rate and high temperature. Herein, metal@Silicalite-1 structured catalysts with high adhesion and thermal stability were successfully prepared by hydroxylating the substrate with anatase. Rich surface Ti-OH significantly strengthened the adhesion stability of the zeolite coating. In propane dehydrogenation reaction, the optimized PtZn@S-1-15Ti showed a high specific activity of 49.6 mol_C3H6·mol_Pt⁻¹·s⁻¹ with propylene selectivity above 99% at 600°C. The introduction of anatase accelerated the aggregation of silicon sources and induced nucleation with growth content of zeolite increased by 3.6 times. It breaks the inherent contradiction between high loading amount and strong binding ability of coated catalysts, which broadens the avenues for industrial applications.

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无铬酸盐增强型 PtZn@Silicalite-1 结构催化剂促进丙烷脱氢

结构催化剂具有扩散效率高、传热阻力小等优点，在非绝热气固工艺中受到越来越多的关注。然而，金属支撑涂层催化剂面临着结合强度较弱、烧结严重等问题，尤其是在大流量和高温条件下。在此，通过对锐钛矿基底进行羟基化处理，成功制备了具有高粘附性和热稳定性的金属@硅灰石-1结构催化剂。丰富的表面 Ti-OH 显著增强了沸石涂层的粘附稳定性。在丙烷脱氢反应中，优化后的 PtZn@S-1-15Ti 在 600°C 时的比活度高达 49.6 molC3H6-molPt-1-s-1，丙烯选择性超过 99%。锐钛矿的引入加速了硅源的聚集并诱导成核，沸石的生长含量增加了 3.6 倍。它打破了涂层催化剂高负载量与强结合能力之间的固有矛盾，拓宽了工业应用的途径。

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

AIChE Journal 工程技术-工程：化工

CiteScore

7.10

自引率

10.80%

发文量

411

审稿时长

3.6 months

期刊介绍： The AIChE Journal is the premier research monthly in chemical engineering and related fields. This peer-reviewed and broad-based journal reports on the most important and latest technological advances in core areas of chemical engineering as well as in other relevant engineering disciplines. To keep abreast with the progressive outlook of the profession, the Journal has been expanding the scope of its editorial contents to include such fast developing areas as biotechnology, electrochemical engineering, and environmental engineering. The AIChE Journal is indeed the global communications vehicle for the world-renowned researchers to exchange top-notch research findings with one another. Subscribing to the AIChE Journal is like having immediate access to nine topical journals in the field. Articles are categorized according to the following topical areas: Biomolecular Engineering, Bioengineering, Biochemicals, Biofuels, and Food Inorganic Materials: Synthesis and Processing Particle Technology and Fluidization Process Systems Engineering Reaction Engineering, Kinetics and Catalysis Separations: Materials, Devices and Processes Soft Materials: Synthesis, Processing and Products Thermodynamics and Molecular-Scale Phenomena Transport Phenomena and Fluid Mechanics.