| http://www.w3.org/ns/prov#value | - Deactivated catalysts may be reactivated, for example, by burning-off in air or lean air at 250-550??? C. Alternatively to burning-off, a treatment with at lower temperature, either in the liquid or in the gas phase, with mineral acids, for example sulfuric acid or hydrochloric acid, with organic solvents or with oxidizing compounds is possible; mention should be made here in particular of NOx, H2
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