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Formation of Carboxylic Acids from Small Alkanes in Zeolite H‐ZSM‐5
Author(s) -
Luzgin Mikhail V.,
Stepanov Alexander G.,
Sassi Alain,
Sommer Jean
Publication year - 2000
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/1521-3765(20000703)6:13<2368::aid-chem2368>3.0.co;2-h
Subject(s) - isobutane , chemistry , propane , alkane , zeolite , methane , formate , carbenium ion , inorganic chemistry , hydrocarbon , catalysis , organic chemistry , medicinal chemistry
The activation of propane and isobutane in acidic zeolite H‐ZSM‐5 in the presence of both CO and H 2 O 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 CC 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 H 2 O were present on H‐ZSM‐5. This species disappeared in the presence of the alkane. At 573 K, the generation of large amounts of CO 2 indicates a much higher conversion of the alkanes into carboxylic acids which, however, decompose under the reaction conditions.