United Scientific Group (A nonprofit organization) like to extend our heart full thanks to the scientific committee, our sponsors, speakers and presenters for making the 4th International Conference on Catalysis and Chemical Engineering a great success! The event was held at the Four Points by Sheraton Los Angeles International Airport Hotel, Los Angeles, CA from February 24-27, 2020. After prodigious success of four annual conferences, we are now proudly announcing the 5th International Conference on Catalysis and Chemical Engineering at San Francisco, CA, USA during February 22-24, 2021 (San Francisco, CA, USA) and would like to continue our success journey further.