Solid-state synthesis of aluminophosphate-based zeotypes from conventional amorphous precursors: Strategy and catalytic performance

IF 4.8 3区材料科学 Q1 CHEMISTRY, APPLIED Microporous and Mesoporous Materials Pub Date : 2024-10-30 DOI:10.1016/j.micromeso.2024.113396

Xue Li, Xiaolei Li, Xiaoming Liu, Xinning Song, Bo Wang, Lulu Xu, Shuo Tao

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Abstract

Exploring novel strategies for the preparation of zeolitic materials with high performance continues to be of great significance. Here we report a general solid-state approach for fabricating aluminophosphate (AlPO)-based zeotypes by directly calcining conventional amorphous precursors at 300 °C for just 30 min. Accordingly, AEL, AFI, LTA and CHA types of AlPO-based zeotypes with high crystallinity and similar textural properties to those of counterparts made by established synthesis approaches have been synthesized. As a demonstration, the catalytic performance of Mg-substituted AlPO-11 (S-MgAlPO-11) in hydroisomerization of n-hexadecane (n-C₁₆) was also investigated. Compared with the Pt supported on conventional MgAlPO-11 (Pt/C-MgAlPO-11) catalyst, the Pt/S-MgAlPO-11catalyst exhibits higher isomerized (87 % vs. 84 %), multi-branched C₁₆ (48 % vs. 30 %) yields and superior reaction stability, attributing to the improved diffusion property and appropriate metal-acid balance. This strategy provides an efficient approach to synthesis promising zeolitic catalysts for industrial applications.

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从传统无定形前驱体固态合成基于磷酸铝的沸石：策略和催化性能

探索制备高性能沸石材料的新策略仍然具有重要意义。在此，我们报告了一种通用的固态方法，通过在 300 °C 下直接煅烧传统的无定形前驱体，仅需 30 分钟即可制备出基于磷酸铝 (AlPO) 的沸石。因此，我们合成了 AEL、AFI、LTA 和 CHA 类型的铝磷酸盐沸石，这些沸石具有高结晶度和相似的纹理特性，与采用现有合成方法制造的沸石类似。作为示范，还研究了镁取代的 AlPO-11（S-MgAlPO-11）在正十六烷（n-C16）加氢异构化中的催化性能。与传统 MgAlPO-11 催化剂（Pt/C-MgAlPO-11）上的铂相比，Pt/S-MgAlPO-11 催化剂具有更高的异构化产率（87% 对 84%）、多分支 C16 产率（48% 对 30%）和更优越的反应稳定性，这归功于更好的扩散性能和适当的金属酸平衡。这种策略为合成工业应用的沸石催化剂提供了一种有效的方法。

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来源期刊

Microporous and Mesoporous Materials 化学-材料科学：综合

CiteScore

10.70

自引率

5.80%

发文量

649

审稿时长

26 days

期刊介绍： Microporous and Mesoporous Materials covers novel and significant aspects of porous solids classified as either microporous (pore size up to 2 nm) or mesoporous (pore size 2 to 50 nm). The porosity should have a specific impact on the material properties or application. Typical examples are zeolites and zeolite-like materials, pillared materials, clathrasils and clathrates, carbon molecular sieves, ordered mesoporous materials, organic/inorganic porous hybrid materials, or porous metal oxides. Both natural and synthetic porous materials are within the scope of the journal. Topics which are particularly of interest include: All aspects of natural microporous and mesoporous solids The synthesis of crystalline or amorphous porous materials The physico-chemical characterization of microporous and mesoporous solids, especially spectroscopic and microscopic The modification of microporous and mesoporous solids, for example by ion exchange or solid-state reactions All topics related to diffusion of mobile species in the pores of microporous and mesoporous materials Adsorption (and other separation techniques) using microporous or mesoporous adsorbents Catalysis by microporous and mesoporous materials Host/guest interactions Theoretical chemistry and modelling of host/guest interactions All topics related to the application of microporous and mesoporous materials in industrial catalysis, separation technology, environmental protection, electrochemistry, membranes, sensors, optical devices, etc.