Enhanced HCl resistance of Na-Ce/Al2O3 hydrolysis catalyst to boost blast furnace gas purification

The activity of carbonyl sulfur (COS) hydrolysis catalyst is inhibited by hydrogen chloride (HCl) and then restricts the application of blast furnace gas purification. The presence of HCl significantly reduces the COS hydrolysis conversion by destroying the Al-O bond and -OH. A novel Na and Ce supported Al-based catalyst (Na-Ce/Al 2 O 3 ) was designed to enhance the activity of COS hydrolysis in an HCl-containing atmosphere. It has been found that the addition of Ce creates oxygen vacancy, with three effects on promoting catalyst activity. The oxidation of hydrogen sulfide (H 2 S) is inhibited due to the occupation of the oxygen vacancy by HCl, reducing the sulfur species deposition. H 2 O can be adsorbed and dissociated on the oxygen vacancy to produce -OH group, improving COS hydrolysis. HCl can be preferentially anchored on the oxygen vacancy based on the adsorption energy, protecting -OH group. The improvement of HCl-resistance is essential for the Na-Ce/Al 2 O 3 hydrolysis catalyst to adapt to the complex atmosphere of blast furnace gas and increase the catalyst lifespan.