A vanadium oxide on titania (V2O5/TiO2) catalyst was analyzed by Atomic Absorption. In preparation for analysis, 65 mg of the solid catalyst was dissolved in 10 ml of acid and once dissolved the solution was made up to 50 ml using distilled water.
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Questions for completion
q1)
A vanadium oxide on titania (V2O5/TiO2) catalyst was analyzed by Atomic Absorption. In preparation for analysis, 65 mg of the solid catalyst was dissolved in 10 ml of acid and once dissolved the solution was made up to 50 ml using distilled water. Finally, this solution was diluted by taking 1 ml of the solution and diluting up to 250 ml in distilled water. Following analysis by AA this diluted solution was found to contain 0.81 ppm Vanadium. Calculate the wt% vanadium oxide in the catalyst. Explain all steps of your calculations and make sure to include units throughout. Briefly discuss the advantages and disadvantages of using AA for the characterisation of this catalyst.
q2 The emissions from a VOC abatement system contained 90 ppmV CH4 and 10 vol% CO2 at 90°C and 1atm. Express the concentration of each in mg m−
q 3) The exhaust gas of a petrol engine contains 900 ppm NOx, 750 ppm hydrocarbons and 0.7% CO. This exhaust gas passes through a 3-way catalyst (volume 2 litres). The concentration of the outlet gas stream is 700 ppm NOx, 35 ppm hydrocarbons and 105 ppm CO.
- Calculate % conversion of NOx, hydrocarbons and CO.
- Calculate the overall flow rate (m3 min−1) of the exhaust gas given that the VHSV is 135,000 h−1.
- Outline ways of increasing the performance of this catalyst (give reasons for your answer).
