United Scientific Group (USG) successfully completed the First International Conference on Catalysis and Chemical Engineering, in Baltimore, USA during February 22-24, 2017(CCE-2017) and Second International Conference on Catalysis and Chemical Engineering, in Paris, France during February 19-21, 2018 (CCE-2018) and Third International Conference on Catalysis and Chemical Engineering at Houston TX, USA during February 25-27, 2019 (CCE-2019), with the enthusiasm and prodigious success of three annual conferences, USG is proudly announcing the Fourth International Conference on Catalysis and Chemical Engineering during February 24-26, 2020 at Los Angeles, CA (CCE-2020).