Ammonia synthesis catalyst, method for producing the same, and method for synthesizing ammonia using the same

A method for producing an ammonia synthesis catalyst, comprising the steps of:

• obtaining a catalyst support by subjecting a catalyst support precursor including cerium oxide to heat treatment in a reducing atmosphere at 600 to 700° C. for 5 hours or more, wherein the catalyst support precursor has a peak pore diameter in a range of 4 to 16 nm and a pore volume in a pore diameter range of 4 to 16 nm of 0.16 cm3/g or more, as measured by a Barrett-Joyner-Halenda (BJH) method after calcination in air at 500° C. for 5 hours or more;
• and
• supporting ruthenium on the catalyst support.