The "21st Edition of International Conference on Catalysis, Chemical Engineering and Technology" (CCT 2026) is set for June 18-20, 2026 at Barcelona, Spain, featuring a hybrid format for both onsite and online participation. Under the theme “Catalyzing Innovation: Connecting Chemistry, Engineering, and Technology for Tomorrow's World,” this event offers an unparalleled opportunity for global collaboration across academia and industry in catalysis and chemical engineering. Participants will include researchers, chemical engineers, industrial practitioners, innovators, and policymakers dedicated to advancing the frontiers of catalysis and technology. The conference provides a dynamic environment for exchanging knowledge and fostering partnerships that drive sustainable chemical processes. Extensive topics will be addressed, including catalytic reaction mechanisms, process intensification, renewable feedstocks, environmental catalysis, and nanocatalysts. Cutting-edge scientific developments and practical applications alike will be explored, showcasing the latest trends transforming the field. A diverse program of keynote lectures, oral presentations, poster sessions, and workshops invites attendees to share breakthroughs and engage in technical discussions. Whether seasoned experts or emerging scientists, all will find valuable opportunities to grow and connect.