Is it a Catalyst or an Intermediate? (Given Mechanism)

A catalyst is a chemical that appears as a reactant first, and then as a product. It has been regenerated and doesn't appear in the overall reaction. An intermediate is a chemical that appears as a product first, and then as a reactant. It was produced, but it consumed before the reaction is over. It also doesn't appear in the overall reaction. Check me out: http://www.chemistnate.com