A large-surface-area TS-1 nanocatalyst: a combination of nanoscale particle sizes and hierarchical micro/mesoporous structures.

RSC Adv

State Key Lab of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences Shanghai 200050 China

Published: March 2019

AI Article Synopsis

  • Researchers created a new type of nanozeolite called TS-1 (nanoTS-1_D) using a two-step process that combines dry-gel steam-assisted crystallization and alkali-etching, leading to structures with enhanced micro/mesopores.
  • The nanoTS-1_D exhibits a high specific surface area of 606 m²/g and pore volume of 0.86 cm³/g, confirmed through various characterization techniques.
  • In comparison to conventional TS-1 materials, nanoTS-1_D shows superior performance in 1-hexene epoxidation, achieving 40.9% olefin conversion and 96.3% selectivity, along with strong stability through multiple cycles of use.

Article Abstract

By a simple sequent process of dry-gel steam-assisted crystallization and following a top-down alkali-etching treatment, hierarchically structured TS-1 nanozeolites (nanoTS-1_D) with abundant micro/mesopores have been synthesized for the first time, and they exhibit remarkably high specific surface area of 606 m g and pore volume of 0.86 cm g. Characterization by XRD, FTIR, UV-vis and EM confirm the exclusive incorporation of titanium species in zeolite frameworks. More importantly, compared with the microporous TS-1 nanocrystal material with identical particle sizes of 80 nm (nanoTS-1) and submicrometer-sized mesoporous TS-1 material (mesoTS-1), here the reported nanoTS-1_D catalyst shows greatly improved performance in the model reaction of 1-hexene epoxidation. 40.9% olefin conversion and 96.3% epoxide selectivity are achieved and its high stability is verified by the 6 recycling-regeneration tests.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9062146PMC
http://dx.doi.org/10.1039/c9ra00124gDOI Listing

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