Open AccessOXIDATIVE AMMONOLYSIS OF 4-METHYLPYRIDINE ON OXIDE VANADIUM-TITANIUM-ZIRCONIUM CATALYST MODIFIED BY TIN AND TUNGSTEN OXIDES
Author(s) -
T. P. Mikhailovskaya,
R. Kurmakyzy,
D. K. Tolemisova,
K. A. Kadirbekov,
Gazprom Neft-Kazakhstan Llp
Publication year - 2021
Publication title -
himičeskij žurnal kazahstana
Language(s) - English
Resource type - Journals
eISSN - 2710-1185
pISSN - 1813-1107
DOI - 10.51580/2021-1/2710-1185.21
Subject(s) - catalysis , vanadium , inorganic chemistry , zirconium , pentoxide , vanadium oxide , titanium , anatase , selectivity , materials science , monoclinic crystal system , tin , tungsten , chemistry , oxide , yield (engineering) , molybdenum , titanium oxide , crystal structure , metallurgy , organic chemistry , photocatalysis
Catalysts based on vanadium pentoxide modified by Ti, Sn, Zr and W oxides were tested in the oxidative ammonolysis of 4-methylpyridine. The role of the main process parameters such as temperature, the ratio of the initial components in the conversion of the methyl group to the nitrile one, and the optimal conditions for the oxidative ammonolysis of 4-methylpyridine were determined. It is determined that the V-Ti-Zr-O-catalyst and the sample containing 9% of tungsten oxide are superior in catalytic activity to the V-Ti-Zr-Sn-O contact. Conditions that ensure a high selectivity for the formation of 4-cyanopyridine were found. The highest yield of the target product (85-86%) was obtained on V-Ti-Zr-W-O at 270 °C, and the yield of 4-cyanopyridine was 87.5% at 310° C on the V-Ti-Zr-Sn-O catalyst. The phase composition and structural changes occurring in modified vanadium oxide catalysts have been studied. It is determined that mixed V-Ti-Zr-Sn-O and V-Ti-Zr-W-O catalysts contain ZrV2O7, the monoclinic modification of ZrO2 (baddeleyite), TiO2 (anatase), SnO2, WO3, and V2O5. In catalysts, it can exist in small amounts as a separate VO2 phase. The V-Ti-Zr-W-O catalyst showed the best catalytic properties. It has highactivity and selectivity towards 4-cyanopyridine.