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Title: Influence of Ti‐incorporated Zeolite Topology and Pore Condensation on Vapor Phase Propylene Epoxidation Kinetics with Gaseous H 2 O 2

Journal Article · · Angewandte Chemie
ORCiD logo [1];  [1]; ORCiD logo [1]; ORCiD logo [2]
  1. Department of Chemical and Biomolecular Engineering University of Illinois Urbana-Champaign Urbana IL 61801 USA
  2. Department of Chemical and Biomolecular Engineering University of Illinois Urbana-Champaign Urbana IL 61801 USA, School of Chemical and Biomolecular Engineering Georgia Institute of Technology Atlanta GA 30332 USA

Abstract Vapor‐phase propylene (C 3 H 6 ) epoxidation kinetics with hydrogen peroxide (H 2 O 2 ) strongly reflects the physical properties of Ti‐incorporated zeolite catalysts and the presence of spectating molecules (“solvent”) near active sites even without a bulk liquid phase. Steady‐state turnover rates of C 3 H 6 epoxidation and product selectivities vary by orders of magnitudes, depending on the zeolite silanol ((SiOH) x ) density, pore topology (MFI, *BEA, FAU), and the quantity of condensed acetonitrile (CH 3 CN) molecules nearby active sites, under identical reaction mechanisms sharing activated H 2 O 2 intermediates on Ti surfaces. Individual kinetic analyses for propylene oxide (PO) ring‐opening, homogeneous diol oxidative cleavage, and homogeneous aldehyde oxidation reveal that secondary reaction kinetics following C 3 H 6 epoxidation responds more sensitively to the changes in zeolite physical properties and pore condensation with CH 3 CN. Thus, higher PO selectivities achieved in hydrophilic Ti‐MFI at steady‐state reflect the preferential stabilization of transition states for C 3 H 6 epoxidation (a primary reaction) relative to PO ring‐opening and oxidative cleavage (secondary reactions) that solvation effects that reflect interactions among condensed CH 3 CN within pores and the extended pore structure.

Sponsoring Organization:
USDOE
Grant/Contract Number:
NONE; SC0020224
OSTI ID:
2373256
Journal Information:
Angewandte Chemie, Journal Name: Angewandte Chemie Journal Issue: 30 Vol. 136; ISSN 0044-8249
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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