In situ solid-state NMR studies of the catalytic conversion of methanol on the molecular sieve SAPO-34
- Univ. of Cambridge (England)
We have monitored the shape-selective catalytic conversion of methanol (MeOH) to low-molecular-weight olefins and aliphatics over the molecular sieve SAPO-34 using {sup 13}C and {sup 1}H magic-angle-spinning (MAS) NMR in tandem with gas chromatography. The size of the eight-membered windows in the structure limits the gas-phase products to linear C{sub 1}, C{sub 2}, and C{sub 3} species. However, the main species present in the intracrystalline space are branched C{sub 4} and C{sub 5} saturated hydrocarbons such as isobutane and isopentane: too large to leave the intracrystalline pore system they become trapped, thus imposing an additional steric constraint on the diffusion of linear hydrocarbons.
- OSTI ID:
- 6580283
- Journal Information:
- Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 94:7; ISSN 0022-3654; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
010408* -- Coal
Lignite
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ADSORBENTS
ALCOHOLS
CONVERSION
DATA
DATA ANALYSIS
EXPERIMENTAL DATA
FLUIDS
GASES
HYDROXY COMPOUNDS
INFORMATION
MEASURING INSTRUMENTS
MEASURING METHODS
METHANOL
MOLECULAR SIEVES
NMR SPECTRA
NUMERICAL DATA
ORGANIC COMPOUNDS
SPECTRA
SYNTHESIS GAS