We are proposing 4 days of beamtime on GEM to conduct the experiment on 10 alloy nanoparticles; PdxRu1-x (x = 0, 0.1, 0.3, 0.5, 0.7, 0.9, 1) and PdRuM (M = Rh, Pt, Ir). We have found that these alloys are immiscible in bulk scale but form solid solutions in nanometer scale by using a scanning transmission microscope with an energy-dispersive X-ray analysis. These alloys are expected to be high-performance and low-cost catalysts to remove CO and NOx in exhaust gas of cars. The diffraction patterns and derived pair-distribution functions will provide information on the miscibility in an atomic scale. The large difference between the neutron scattering cross sections of Pd and Ru and the high neutron intensity of GEM are keys in the present experiment. The problems pointed out in the previous rejected proposal have been resolved, i.e., sample mass: 100 mg to 500 mg, PVP: 30% to 10 %.