Scholarlink

<p>Currently, one of the most significant technologies for lowering NO<sub><i>x</i></sub> emissions from diesel engines is the selective catalytic reduction with ammonia (NH<sub>3</sub>-SCR) technique, which uses ammonia as a reducing agent. The wide active temperature window, excellent nitrogen selectivity, and outstanding hydrothermal aging stability of NH<sub>3</sub>-SCR catalysts are important given the real working circumstances of engines and the regeneration of DPF upstream of the SCR system. Cu-SAPO-34, a small-pore molecular sieve catalyst, has drawn a lot of interest because of its high-temperature hydrothermal aging stability and good low-temperature activity. One important problem that must be resolved, nevertheless, is Cu-SAPO-34’s low-temperature hydrothermal stability. The impact of loading the active element Ce on the catalyst’s performance and low-temperature hydrothermal stability was examined in this work. Three CuCe<sub><i>x</i></sub>-SAPO-34 catalysts with varying Ce/Al molar ratios were created using a one-step synthesis process after varying Ce loading levels were established. According to the outcomes of performance assessment trials, the catalyst’s improved effect on the NO<sub><i>x</i></sub> conversion rate is most noticeable when the Ce/Al ratio is 0.06 when compared to the catalyst without Ce. Multiple characterizations of the CuCe<sub>0.06</sub>-SAPO-34 and Cu-SAPO-34 catalysts have revealed that loading a suitable amount of Ce can help the catalyst form a porous structure, improve the catalyst’s distribution of copper ions and acidic sites, increase the stability of its pore and surface structures, lessen aging-related deterioration, and allow the catalyst to have a large number of acidic sites and SCR active sites both before and after aging, all of which contribute to the catalyst’s excellent SCR performance.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Investigation into the effects of Ce element loading on Cu-SAPO-34 catalyst structure and performance

  • 期刊论文

  • 发表日期：

    2025年9月17日

查看全文
  • Bin Guan,
  • Zhongqi Zhuang,
  • Lei Zhu,
  • Xuehan Hu,
  • Chenyu Zhu,
  • Sikai Zhao,
  • Junyan Chen,
  • Junjie Gao,
  • Kaiyou Shu,
  • Hongtao Dang,
  • Luyang Zhang,
  • Tiankui Zhu,
  • Wenbo Zeng,
  • Minfan Qian,
  • Shuai Chen,
  • Linhui Wang,
  • Can Zhu,
  • Jiaming He,
  • Qinghan Xian,
  • Zhen Huang

摘要

Currently, one of the most significant technologies for lowering NOx emissions from diesel engines is the selective catalytic reduction with ammonia (NH3-SCR) technique, which uses ammonia as a reducing agent. The wide active temperature window, excellent nitrogen selectivity, and outstanding hydrothermal aging stability of NH3-SCR catalysts are important given the real working circumstances of engines and the regeneration of DPF upstream of the SCR system. Cu-SAPO-34, a small-pore molecular sieve catalyst, has drawn a lot of interest because of its high-temperature hydrothermal aging stability and good low-temperature activity. One important problem that must be resolved, nevertheless, is Cu-SAPO-34’s low-temperature hydrothermal stability. The impact of loading the active element Ce on the catalyst’s performance and low-temperature hydrothermal stability was examined in this work. Three CuCex-SAPO-34 catalysts with varying Ce/Al molar ratios were created using a one-step synthesis process after varying Ce loading levels were established. According to the outcomes of performance assessment trials, the catalyst’s improved effect on the NOx conversion rate is most noticeable when the Ce/Al ratio is 0.06 when compared to the catalyst without Ce. Multiple characterizations of the CuCe0.06-SAPO-34 and Cu-SAPO-34 catalysts have revealed that loading a suitable amount of Ce can help the catalyst form a porous structure, improve the catalyst’s distribution of copper ions and acidic sites, increase the stability of its pore and surface structures, lessen aging-related deterioration, and allow the catalyst to have a large number of acidic sites and SCR active sites both before and after aging, all of which contribute to the catalyst’s excellent SCR performance.