Synthesis of Cu-SSZ-13 with different Si/Al ratios by zeolite Y conversion and its NH3-SCR activity and hydrothermal stability

IF 4.7 2区化学 Q2 CHEMISTRY, PHYSICAL

Applied Catalysis A: General Pub Date : 2024-06-05 DOI:10.1016/j.apcata.2024.119842

Fengmin Sun , Ruihua Zhang , Weiyong Jiao , Jianfeng Jia , Huixiang Wang , Xiaoning Hou , Wenting Lv , Baoliang Lv

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引用次数: 0

Abstract

Interzeolite conversion is a convenient and low-cost method to get Cu-SSZ-13 zeolite for ammonia selective catalytic reduction (NH₃-SCR) of NO, but it is usually difficult to regulate the Si/Al ratio of the SSZ-13 in a wide range by interzeolite conversion. In this work, Cu-SSZ-13 catalysts with Si/Al ratios of 5, 10 and 20 were accurately synthesized by zeolite Y conversion with additional Si source. Specifically, the physical properties of Cu-SSZ-13 were characterized by XRD, SEM, ICP-AES and BET. The Al distribution and Cu²⁺ locations in Cu-SSZ-13 were investigated by ²⁹Si and ²⁷Al MAS NMR, DR UV–vis, H₂-TPR and EPR. The results show that Cu-SSZ-13 with Si/Al ratio of 10 shows the considerable NH₃-SCR activity and hydrothermal stability simultaneously. Moreover, different types of relationships between the reaction rate constant k and the content of α-Cu²⁺, β-Cu²⁺ species were found, indicating the diverse catalytic properties of the two active copper sites.

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通过沸石 Y 转化合成不同 Si/Al 比率的 Cu-SSZ-13 及其 NH3-SCR 活性和水热稳定性

沸石间转化是获得用于氨选择性催化还原氮氧化物（NH3-SCR）的 Cu-SSZ-13 沸石的一种方便且低成本的方法，但通常很难通过沸石间转化在较大范围内调节 SSZ-13 的 Si/Al 比。在这项工作中，通过沸石 Y 转化并添加硅源，精确合成了 Si/Al 比为 5、10 和 20 的 Cu-SSZ-13 催化剂。具体而言，通过 XRD、SEM、ICP-AES 和 BET 对 Cu-SSZ-13 的物理性质进行了表征。通过 29Si 和 27Al MAS NMR、DR UV-vis、H2-TPR 和 EPR 研究了 Cu-SSZ-13 中 Al 的分布和 Cu2+ 的位置。结果表明，Si/Al 比为 10 的 Cu-SSZ-13 同时具有相当高的 NH3-SCR 活性和水热稳定性。此外，还发现反应速率常数 k 与 α-Cu2+ 和 β-Cu2+ 物种含量之间存在不同类型的关系，这表明两个活性铜位点具有不同的催化特性。

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来源期刊

Applied Catalysis A: General 化学-环境科学

CiteScore

9.00

自引率

5.50%

发文量

415

审稿时长

24 days

期刊介绍： Applied Catalysis A: General publishes original papers on all aspects of catalysis of basic and practical interest to chemical scientists in both industrial and academic fields, with an emphasis onnew understanding of catalysts and catalytic reactions, new catalytic materials, new techniques, and new processes, especially those that have potential practical implications. Papers that report results of a thorough study or optimization of systems or processes that are well understood, widely studied, or minor variations of known ones are discouraged. Authors should include statements in a separate section "Justification for Publication" of how the manuscript fits the scope of the journal in the cover letter to the editors. Submissions without such justification will be rejected without review.

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