Introduction of iron by a feasible way to regulate Cu sites of Cu-SSZ-13 with enhanced hydrothermal stability and SO2 resistance for NH3-SCR

IF 4.8 3区材料科学 Q1 CHEMISTRY, APPLIED

Microporous and Mesoporous Materials Pub Date : 2025-05-01 DOI:10.1016/j.micromeso.2025.113668

Mingjun Tan , Qi Zhao , Zhihui Wang , Die Qu , Bingbing Chen , Chuan Shi

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Abstract

Copper-exchanged CHA zeolite has served as a commercial catalyst for selective catalytic reduction of NO_x with NH₃ (NH₃-SCR) in diesel aftertreatment systems for the last decade, in which the distribution of isolated Cu ions plays a vital role in the activity, SO₂ resistance, and hydrothermal stability. In this study, an innovative organic solvent-assisted incipient wetness impregnation strategy for fabricating Fe-modified Cu-SSZ-13 catalyst has been developed to regulate the distribution of Cu²⁺. Catalyst characterizations elucidated that Fe has been successfully incorporated into zeolite at ion-exchange sites. The introduction of Fe ions can effectively improve the dispersion of Cu²⁺ and anchor more Cu²⁺ at 6MR sites. Consequently, the bimetallic zeolite exhibits decent SO₂ resistance and hydrothermal stability compared to Cu-SSZ-13 which possesses a conspicuous prospect for practical application. This novel secondary-ion-assisted protocol for precise regulation of active sites distribution could provide fundamental insights for the rational design of high-performance NH₃-SCR catalysts.

Abstract Image

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通过可行的方式引入铁调控Cu- ssz -13的Cu位点，提高了Cu- ssz -13的水热稳定性和抗SO2能力

近十年来，铜交换CHA沸石一直被用作柴油后处理系统中NH3选择性催化还原NOx （NH3- scr）的商业催化剂，其中Cu离子的分布对活性、抗SO2性和水热稳定性起着至关重要的作用。在本研究中，开发了一种创新的有机溶剂辅助初始湿浸渍策略来制备fe修饰的Cu-SSZ-13催化剂，以调节Cu2+的分布。催化剂表征表明，铁已成功地结合到沸石的离子交换位点。Fe离子的引入可以有效地改善Cu2+的分散，并在6MR位点上锚定更多的Cu2+。因此，与Cu-SSZ-13相比，该双金属沸石具有良好的抗SO2性能和水热稳定性，具有明显的实际应用前景。这种新型的二级离子辅助活性位点分布精确调控方案可为高性能NH3-SCR催化剂的合理设计提供基础见解。

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

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.