Ammonia storage/release characteristics of CeSnWBaOx/TiO2 catalyst in solving the problem of ammonia slip

•CeSnWBaOx/TiO2 catalyst maintained stable NO removal under fluctuating flue gas.•Ammonia was mainly stored in physical form and partly by chemical adsorption.•High temperature enhanced ammonia activation, excess NO induced ammonia release.•The characteristics have great guiding significance for dealing with ammonia slip.