Oxidative ammonolysis of 3,4-dimethylpyridine on the vanadium oxide catalysts

Oxidative ammonolysis of 3,4-dimethylpyridine on an individual vanadium oxide (V2O5) catalyst and binary vanadium oxide catalysts, modified by additions of SnO2 and ZrO2, has been studied. A connection between ??- acidity of the methyl groups of the substrate in the gaseous phase and in the chemosorbed state and the sequence of their transformation into a cyano group has been established. It has been shown that nucleophilicity of vanadyl oxygen, calculated by the Density Functional Theory method, increases with V2O5 modification by SnO2 and ZrO2 additions. Herewith, an increasing yield of 3- methyl-4-cyanopyridine and imide of pyridine-3,4-dicarboxylic acid was observed. A proposed mechanism of the imide of pyridine-3,4-dicarboxylic acid formation has been discussed

CASE STUDY OF CONVERTER PERFORMANCE EVALUATION ON SULFURIC ACID PRODUCTION (DEPARTMENT III PT B)

Converter was one tool unit that consisting 4 beds in the production process of sulfuric acid. The performance of this converter was supported by the addition of a vanadium pentaoxide (V2O5) catalyst. The process that occurring in the converter was double contacts – double absorbers. The purpose of this case was converter performance evaluation that using by SO2 conversion parameter to SO3. Primary data was the dry air flow rate that entering the burner, the SO2 gas content that be into the converter, the catalyst temperature of each converter bed, and the catalyst pressure in each bed converter. Data on the field showed that activity on bed I was 72,96%, and theoretical was 60%. Then, bed II gave 91,22%; 87%; on bed III was 96,85%; 94%; and bed IV was 99,9%; 99,73% as respectively. From these experiments could be concluded that result data was greater than the theoretical. The difference of this conversion indicated that the performance of the converter did not increase

Effect of MgO and V2O5 Catalyst on the Sensing Behaviour of Tin Oxide Thin Film for SO2 Gas

The present work shows the SO2 gas sensing property of SnO2 thin film based sensor prepared by using RF sputtering technique. Different catalysts (MgO and V2O5) in form of nanoclusters having diameter of 600 μm have been loaded on SnO2 surface to detect SO2 gas. The sensing response of all these films towards SO2 is monitored. Microstructural studies have been carried out using XRD and UV-Visible Spectrophotometer and a good correlation has been found between the microstructural and gas sensing properties of these deposited samples. Both catalysts when incorporated with SnO2 film show high selectivity towards SO2 gas at lower operating temperature. MgO gives a sensitivity of 317% at an operating temperature of 280°C towards 500 ppm of SO2 gas whereas V2O5 catalyst gives a sensitivity of 166% at 280°C for the same amount of gas.