Document Detail


Formation of carboxylic acids from small alkanes in zeolite H-ZSM-5
MedLine Citation:
PMID:  10939739     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
The activation of propane and isobutane in acidic zeolite H-ZSM-5 in the presence of both CO and H2O has been studied by in situ solid-state NMR and GC analysis. Evidence was provided for the conversion of propane to isobutyric acid at 373-473 K by cleavage of the C-C bond; methane and ethane are also produced. Isobutane is transformed into pivalic acid with simultaneous production of hydrogen. The low conversion (1-2%) at this temperature was rationalized by the existence of a small number of sites that are capable of generating carbenium ions which are trapped by CO at this temperature. A formate species was observed when CO and H2O were present on H-ZSM-5. This species disappeared in the presence of the alkane. At 573 K, the generation of large amounts of CO2 indicates a much higher conversion of the alkanes into carboxylic acids which, however, decompose under the reaction conditions.
Authors:
Luzgin; Stepanov; Sassi; Sommer
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Publication Detail:
Type:  JOURNAL ARTICLE    
Journal Detail:
Title:  Chemistry (Weinheim an der Bergstrasse, Germany)     Volume:  6     ISSN:  1521-3765     ISO Abbreviation:  Chemistry     Publication Date:  2000 Jul 
Date Detail:
Created Date:  2000-08-09     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9513783     Medline TA:  Chemistry     Country:  GERMANY    
Other Details:
Languages:  Eng     Pagination:  2368-76     Citation Subset:  -    
Affiliation:
Group of NMR Spectroscopy for Catalytic Hydrocarbon Conversion, Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, Novosibirsk.
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