The XYA-5 catalyst was first applied in commercial scale on an 80-kt/a acrylonitrile unit at the Daqing Refining and Chemical Company.Test results had shown that the once-through yield of acrylonitrile The XYA-5 catalyst was first applied in commercial scale on an 80-kt / a acrylonitrile unit at the Daqing Refining and Chemical Company. Test results had shown that the once-through yield of acrylonitrile