This special issue of Catalysis Today results from four sessions, under the collective theme "Catalysis in Sustainable Energy", of the 2ndInternational Symposium on Catalytic Science and Technology in Sustainable Energy and Environment, held in Tianjin, China during October 12-14, 2016. This biennial symposium offers an international forum for discussing and sharing the cutting-edge researches and the most recent breakthroughsin energy and environmental technologies based on catalysis principles. Included in this special issue are 36 invited contributions, which is a noticeable expansion as compared with the 29 contributions published twoyears ago in the previous special issue of Catalysis Today under the same title "Catalytic Science and Technology in Sustainable Energy". We gratefully acknowledge all the authors and reviewers of the manuscripts and the editorial team of Elsevier, without whom the special issue would not have been possible. As the organizer of the EECAT 2016, Y Li expresses his special gratitude to the sponsors, especially Haldor Topsoe and Synfuels China, the participants and the co-organizers for their great contribution to the success of EECAT 2016.
- Chemistry (all)