Structure-directing effects of tetraalkylammonium cations in the interzeolite transformation of zeolitic MWW-type nickel silicate

IF 4.8 3区材料科学 Q1 CHEMISTRY, APPLIED

Microporous and Mesoporous Materials Pub Date : 2025-03-18 DOI:10.1016/j.micromeso.2025.113604

Siyeon Lee, Sungjoon Kweon, Min Bum Park

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Abstract

In this study, we successfully synthesized RUT-type and cristobalite nickel silicate materials by using tetramethylammonium (TMA⁺) and phenyltrimethylammonium ions (PTMA⁺), respectively, through the interzeolite transformation of the parent MWW-type nickel silicate (Ni-MWW). Under hydrothermal conditions, the parent Ni-MWW gradually decomposed into amorphous nickel silicate and subsequently reassembled into RUT and cristobalite structures after 12 and 24 h of crystallization time, respectively. With increasing crystallization time, the framework Ni species were stabilized by converting intermediate Ni species into isolated Ni species, resulting in a more thermodynamically stable chemical state. During the interzeolite transformation process, we obtained well-dispersed Ni species within fully crystallized RUT and cristobalite structures, with Ni loadings of approximately 7 and 8 wt%, respectively. Here, we comprehensively discuss the structure-directing effects of tetraalkylammonium cations, which lead to variations in both crystallization and stabilization rates of framework Ni species through the interzeolite transformation of Ni-MWW. This includes the use of TMAOH and PTMAOH, as well as our previous studies on tetraethylammonium hydroxide (TEAOH), tetrapropylammonium hydroxide (TPAOH), and N,N,N-trimethyl-1-adamantammonium hydroxide (TMAdaOH).

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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.