Scholarlink

<p>Microporous SAPO-34 molecular sieves are prone to rapid deactivation due to coke deposition in the methanol-to-olefins (MTO) reaction, primarily because of diffusion limitations. To address this issue, we propose a metal–organic framework (MOF)-assisted one-step hydrothermal synthesis strategy. For the first time, UiO-66 is introduced into the SAPO-34 synthesis system, successfully constructing SAPO-34 crystals with a stepped, special morphology. The results indicate that the addition of UiO-66 causes the samples to gradually aggregate and stack, forming an abundant hierarchical pore structure. Meanwhile, Zr species are incorporated into the molecular sieve framework, which effectively modulates the acidic properties by significantly reducing the strength of the strong acid sites. When applied to the MTO reaction, the UiO-66-modified SAPO-34 exhibits a significantly prolonged catalytic lifetime and enhanced selectivity towards light olefins (ethylene and propylene) compared to the unmodified SAPO-34. This enhanced performance is attributed to the abundant hierarchical pores providing rapid diffusion channels, and the reduced acid strength retarding coke deposition. This study provides a new design strategy for the one-step construction of hierarchical pore structures coupled with the introduction of metal species to regulate acidity.</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

Metal–organic framework-assisted synthesis of SAPO-34 with enhanced catalytic performance for the methanol-to-olefins reaction

  • 期刊论文

  • 发表日期：

    2026年7月18日

查看全文
  • Liheng Zhang,
  • Huaibin Miao,
  • Fangfei Li

摘要

Microporous SAPO-34 molecular sieves are prone to rapid deactivation due to coke deposition in the methanol-to-olefins (MTO) reaction, primarily because of diffusion limitations. To address this issue, we propose a metal–organic framework (MOF)-assisted one-step hydrothermal synthesis strategy. For the first time, UiO-66 is introduced into the SAPO-34 synthesis system, successfully constructing SAPO-34 crystals with a stepped, special morphology. The results indicate that the addition of UiO-66 causes the samples to gradually aggregate and stack, forming an abundant hierarchical pore structure. Meanwhile, Zr species are incorporated into the molecular sieve framework, which effectively modulates the acidic properties by significantly reducing the strength of the strong acid sites. When applied to the MTO reaction, the UiO-66-modified SAPO-34 exhibits a significantly prolonged catalytic lifetime and enhanced selectivity towards light olefins (ethylene and propylene) compared to the unmodified SAPO-34. This enhanced performance is attributed to the abundant hierarchical pores providing rapid diffusion channels, and the reduced acid strength retarding coke deposition. This study provides a new design strategy for the one-step construction of hierarchical pore structures coupled with the introduction of metal species to regulate acidity.