 BEDFORD, Mass.--BUSINESS WIRE--Aspen Technology, Inc. NASDAQ:AZPN, a global leader in asset optimization software, today announced that Shell Catalysts Technologies, a provider of leading catalysts, technical services and licensed process technologies to refiners, gas treating facilities and chemical plants around the world, is implementing Aspen Schedule ExplorerTM software in multiple plants throughout North America and Europe. The supply chain management solution will improve coordi 