The dehydrogenation catalyst is a shell-type Al₂O₃ containing Pt-Pd pair precious metal catalyst and added rare earth element as the promoter. It has high dispersity and breaken strength, which ensure that it has a higher dehydrogenation activity and higher anti- sulfur, CO and methanol poisoning capabilities, good stability and long lifetime. It is used for urea feed gas dehydrogenation and prevent explosion from mix of small amount of hydrogen and oxygen in high-pressure scrubber or gas absorber.