Open AccessEffect of Reaction Medium on V-Ti Oxide Catalyst Composition in 2-Methyl-5-Ethylpyridine Ammoxidation
Author(s) -
V.M. Pochtennaya,
D. Kh. Sembaev
Publication year - 2017
Publication title -
eurasian chemico-technological journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.227
H-Index - 9
eISSN - 2522-4867
pISSN - 1562-3920
DOI - 10.18321/ectj532
Subject(s) - ammoxidation , catalysis , chemistry , oxide , nuclear chemistry , nitrogen , inorganic chemistry , acrylonitrile , organic chemistry , copolymer , polymer
A chemical composition of V-Ti oxide catalyst changes in accordance with the reaction medium composition in a process of 2-methyl-5-ethylpyrydine ammoxidation into nicotinonitrile in an integral reactor. The presence of alkylpyridine concentration gradient along the catalyst bed leads to the appearance of V 2 O 5 content gradient in the catalyst. V 2 O 5 concentration increases in the conditions of alkylpyridine completed conversion in consequence of oxidative decomposition of VO 2 -TiO 2 solid solution under the influence of N2O nitrogen oxide, which is formed upon the NH 3 oxidation. An increase of V 2 O 5 contents over 5 wt% causes rising of the share of the 2-methyl-5-ethylpyridine and nicotinonitrile destructive oxidation. An introduction of small amounts of alkylpyridine directly into the catalyst bed permits to create the definite alkylpyridine concentration gradient, which the optimal content of V 2 O 5 is corresponding to, for any given conditions of oxidative reaction. The catalysts containing 1-5 wt% of V 2 O 5 and solid solution of VO 2 -TiO 2 possess of the highest selectivity to nicotinonitrile.