Mesoporous EU-1 zeolite with enhanced accessibility and diffusion for bulky molecular reaction

Journal Article · Sun Apr 15 04:00:00 EDT 2018 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2017.12.009· OSTI ID:22803907

Dai, Guang; Ma, Jinghong; Xiao, Huan; Hao, Wenming; Li, Ruifeng ^[1]

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1. College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024 (China)

Highlights: • Mesoporous EU-1 zeolites with adjustable mesoporosity have been first prepared. • One-dimensional in microporous to three-dimensional diffusion in mesoporous EU-1. • Obviously increment of available acid sites for bulky molecules in the zeolite. • Sufficiently reaction space for isomerization and disproportionation of cumene. - Abstract: Mesoporous EU-1 zeolites with adjustable mesoporosity have been prepared by employing silanized silica into the starting synthesis gel, based on the hinder effect of organic moiety to crystal growth. The synthesized mesoporous EU-1 zeolites were characterized by XRD, NMR, SEM/TEM and N{sub 2} adsorption/desorption at 77 K, showing the persistence of inherent microporous framework structure of EU-1 zeolite and the existence of additional mesopores within the range of 3–10 nm. The generation of mesoporosities is from the intercrystalline voids of nanocrystal aggregates. The introduction of mesopores in EU-1 zeolite increased the adsorption of mesitylene with the kinetics diameter larger than the micropore size, and made it possible for the diffusion pattern of n-heptane from one-dimensional in microporous EU-1 to three-dimensional in mesoporous EU-1. This result together with the enhanced accessibility of acidic sites of mesoporous EU-1 improved greatly the catalytic activity and product yields of cumene cracking reaction involving bulky molecules.

• OSTI ID: 22803907
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Vol. 100; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ADSORPTION
CRACKING
CRYSTAL GROWTH
CUMENE
DESORPTION
DIFFUSION
GELS
HEPTANE
ISOMERIZATION
MESITYLENE
NANOSTRUCTURES
NUCLEAR MAGNETIC RESONANCE
SCANNING ELECTRON MICROSCOPY
SILICA
SOL-GEL PROCESS
THREE-DIMENSIONAL LATTICES
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION
ZEOLITES