Rapid synthesis and hydrothermal stability enhancement of Cu-SSZ-13 zeolites for nitrogen oxide removal†

IF 6.1 1区 化学 Q1 CHEMISTRY, INORGANIC & NUCLEAR
Jie Su, Zhe Ma, Yingzhen Wei, Yida Zhou, Mao Shen, Shi-Bin Ren, De-Man Han, Mengyang Chen and Wenfu Yan
{"title":"Rapid synthesis and hydrothermal stability enhancement of Cu-SSZ-13 zeolites for nitrogen oxide removal†","authors":"Jie Su, Zhe Ma, Yingzhen Wei, Yida Zhou, Mao Shen, Shi-Bin Ren, De-Man Han, Mengyang Chen and Wenfu Yan","doi":"10.1039/D4QI02594F","DOIUrl":null,"url":null,"abstract":"<p >Cu-SSZ-13 (<strong>CHA</strong> topology) zeolites are commonly used in diesel engines for the selective catalytic reduction (NH<small><sub>3</sub></small>-SCR) of nitrogen oxides (NO<small><sub><em>x</em></sub></small>). However, their synthesis typically requires long crystallization times and their durability in NH<small><sub>3</sub></small>-SCR is limited. Herein, we achieved a significant reduction in crystallization time, synthesizing SSZ-13 zeolites in just 6 h by using SAPO-18 seeds and a minimal amount of an organic structure-directing agent (OSDA). The OSDA/Si ratio was reduced by a factor of 16 compared to conventional methods. Crystallization studies revealed that SAPO-18 seeds promoted the formation of four-membered rings (4MRs), which quickly combined into double 6-membered rings (D6Rs) with the assistance of the OSDA, enabling rapid crystallization of SSZ-13. The resulting Cu-SSZ-13 demonstrated comparable NH<small><sub>3</sub></small>-SCR performance to conventionally synthesized Cu-SSZ-13 (Cu<small><sub>conv</sub></small>-SSZ-13). Moreover, we introduced Ce ions into Cu-SSZ-13 to enhance its hydrothermal stability and explored the effects of different metal precursors on the catalytic performance. The optimized CuCe(<small>III</small>)<small><sub>0.5</sub></small>-SSZ-13 exhibited superior hydrothermal stability compared to Cu-SSZ-13. Conversely, CuCe(<small>IV</small>)<small><sub>1.0</sub></small>-SSZ-13 and CuCe(<small>III</small>)<small><sub>0.5</sub></small>Ce(<small>IV</small>)<small><sub>1.0</sub></small>-SSZ-13 displayed reduced hydrothermal stability. Characterization revealed that using the Ce(<small>III</small>) precursor inhibited CuO<small><sub><em>x</em></sub></small> formation during hydrothermal ageing, while the Ce(<small>IV</small>) precursor favored the formation of CeO<small><sub>2</sub></small>, decreasing the zeolite stability and promoting CuO<small><sub><em>x</em></sub></small> formation. This work presents a novel approach for rapid SSZ-13 synthesis and highlights the critical role of metal precursors in the performance of bimetallic SSZ-13 zeolites.</p>","PeriodicalId":79,"journal":{"name":"Inorganic Chemistry Frontiers","volume":" 2","pages":" 757-763"},"PeriodicalIF":6.1000,"publicationDate":"2024-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Inorganic Chemistry Frontiers","FirstCategoryId":"92","ListUrlMain":"https://pubs.rsc.org/en/content/articlelanding/2025/qi/d4qi02594f","RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, INORGANIC & NUCLEAR","Score":null,"Total":0}
引用次数: 0

Abstract

Cu-SSZ-13 (CHA topology) zeolites are commonly used in diesel engines for the selective catalytic reduction (NH3-SCR) of nitrogen oxides (NOx). However, their synthesis typically requires long crystallization times and their durability in NH3-SCR is limited. Herein, we achieved a significant reduction in crystallization time, synthesizing SSZ-13 zeolites in just 6 h by using SAPO-18 seeds and a minimal amount of an organic structure-directing agent (OSDA). The OSDA/Si ratio was reduced by a factor of 16 compared to conventional methods. Crystallization studies revealed that SAPO-18 seeds promoted the formation of four-membered rings (4MRs), which quickly combined into double 6-membered rings (D6Rs) with the assistance of the OSDA, enabling rapid crystallization of SSZ-13. The resulting Cu-SSZ-13 demonstrated comparable NH3-SCR performance to conventionally synthesized Cu-SSZ-13 (Cuconv-SSZ-13). Moreover, we introduced Ce ions into Cu-SSZ-13 to enhance its hydrothermal stability and explored the effects of different metal precursors on the catalytic performance. The optimized CuCe(III)0.5-SSZ-13 exhibited superior hydrothermal stability compared to Cu-SSZ-13. Conversely, CuCe(IV)1.0-SSZ-13 and CuCe(III)0.5Ce(IV)1.0-SSZ-13 displayed reduced hydrothermal stability. Characterization revealed that using the Ce(III) precursor inhibited CuOx formation during hydrothermal ageing, while the Ce(IV) precursor favored the formation of CeO2, decreasing the zeolite stability and promoting CuOx formation. This work presents a novel approach for rapid SSZ-13 synthesis and highlights the critical role of metal precursors in the performance of bimetallic SSZ-13 zeolites.

Abstract Image

Cu-SSZ-13沸石的快速合成及水热稳定性增强
Cu-SSZ-13 (CHA型)沸石通常用于柴油发动机的选择性催化还原(NH3-SCR)氮氧化物(NOx)。然而,它们的合成通常需要很长的结晶时间,并且它们在NH3-SCR中的耐久性有限。在本研究中,我们使用SAPO-18种子和少量的有机结构导向剂(OSDA),在6小时内合成了SSZ-13沸石,显著缩短了结晶时间。与传统方法相比,OSDA/Si比降低了16倍。结晶研究表明,SAPO-18种子促进了四元环(4MRs)的形成,这些四元环在OSDA的帮助下迅速结合成双六元环(D6Rs),使SSZ-13快速结晶。所得到的Cu-SSZ-13表现出与常规合成的Cu-SSZ-13 (cuconvs - ssz -13)相当的NH3-SCR性能。此外,我们将Ce离子引入Cu-SSZ-13中以增强其水热稳定性,并探讨了不同金属前驱体对Cu-SSZ-13催化性能的影响。与Cu-SSZ-13相比,优化后的CuCe(III)0.5-SSZ-13具有更好的水热稳定性。相反,CuCe(IV)1.0-SSZ-13和CuCe(III)0.5Ce(IV)1.0-SSZ-13的热液稳定性降低。表征表明,在热液老化过程中,Ce(III)前驱体抑制了CuOx的生成,而Ce(IV)前驱体有利于CeO2的生成,降低了沸石的稳定性,促进了CuOx的生成。这项工作提出了一种快速合成SSZ-13的新方法,并强调了金属前驱体在双金属SSZ-13分子筛性能中的关键作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 求助全文
来源期刊
Inorganic Chemistry Frontiers
Inorganic Chemistry Frontiers CHEMISTRY, INORGANIC & NUCLEAR-
CiteScore
10.40
自引率
7.10%
发文量
587
审稿时长
1.2 months
期刊介绍: The international, high quality journal for interdisciplinary research between inorganic chemistry and related subjects
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信