Use of Better Catalyst

Use of better catalyst by loading caesium-promoted catalyst in the first and last passes of the converter, the conversion of SO2 to SO3 could be started at 390-395 °C in the first pass and higher equilibrium yield could be obtained in the last pass as it was operated at a lower temperature (400-405 °C). 

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Use of better catalyst to increase conversion and reduce by-products and recycle... 

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