Catalyst for Decomposition of Sulfur Trioxide and Hydrogen Production Process

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To provide a sulfur trioxide decomposition catalyst, particularly, a sulfur trioxide decomposition catalyst capable of lowering the temperature required when producing hydrogen by an S-I cycle process. A sulfur trioxide decomposition catalyst comprising a composite oxide of vanadium and at least one metal selected from the group consisting of transition metal and rare earth elements is provided. Also, a sulfur dioxide production process comprising decomposing sulfur trioxide into sulfur dioxide and oxygen by using the sulfur trioxide decomposition catalyst above, is provided. Furthermore, a hydrogen production process, wherein the reaction of decomposing sulfur trioxide into sulfur dioxide and oxygen by an S-I cycle process is performed by the above-described sulfur dioxide production process, is provided.