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Title: Niobium-substituted octahedral molecular sieve (OMS-2) materials in selective oxidation of methanol to dimethoxymethane

Journal Article · · RSC Advances
DOI:https://doi.org/10.1039/C9RA04804A· OSTI ID:1574081
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  1. Department of Chemistry, University of Connecticut, Storrs, USA
  2. Corporate Strategic Research, ExxonMobil Research and Engineering Company, Annandale, USA
  3. Institute of Material Science, University of Connecticut, Storrs, USA
  4. Department of Chemistry, University of Connecticut, Storrs, USA, Institute of Material Science
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Octahedral molecular sieve (OMS-2) refers to a one-dimensional 2 × 2 framework of octahedral manganese oxo units based on the cryptomelane-type framework. Herein, we describe a niobium (Nb) substituted mixed metal oxide of Nb and Mn where the cryptomelane-type framework is retained. These materials are hydrothermally synthesized from the reaction of potassium permanganate, manganese sulfate, and homogeneous niobium(V) precursors. Niobium incorporation up to 31 mol% can be achieved without destroying the one dimensional 2 × 2 framework. The yields of the materials vary between 70 and 90%. These materials are analyzed by powder XRD, BET isotherm, TEM, SEM, XRF, and XPS studies. The synthesized materials show promising activity in selective oxidation of methanol to dimethoxymethane (DMM) at 200 °C. Normalized activity correlations followed the trend 21% Nb-OMS-2 > 15% Nb-OMS-2 > 31% Nb-OMS-2 > 68% Nb-OMS-2 > K-OMS-2. A fluctuation in methanol conversion was observed around 125–150 °C in most samples, suggesting this to be a catalytically important temperature regime when forming active sites for DMM production.

Research Organization:
Univ. of Connecticut, Storrs, CT (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences, and Biosciences Division
Grant/Contract Number:
FG02-86ER13622
OSTI ID:
1574081
Alternate ID(s):
OSTI ID: 1598224
Journal Information:
RSC Advances, Journal Name: RSC Advances Vol. 9 Journal Issue: 56; ISSN 2046-2069
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United Kingdom
Language:
English
Citation Metrics:
Cited by: 11 works
Citation information provided by
Web of Science

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