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VK-WL is a cesium-promoted catalyst designed for continuous operation down to 370°C/700°F in lean SO2+SO3 gasses (less than approximately 2 mole%). At these conditions, VK-WL offers unmatched high activity throughout the entire operating temperature range. The very high activity provides the opportunity to operate the WSA-DC plant at state-of-the-art conversion efficiencies of more than 99.95% with only four catalyst passes.