A method for uniformly dispersing noble metal particles on a porous carrier by
first mixing an alkoxide product of aluminum or silicon and a noble metal precursor
together; then mixing a surfactant into the mixture; then mixing ammonia solution
into the mixture to form a hydroxide of aluminum or silicon; then mixing a reducing
agent into the mixture to convert the noble metal precursor into noble metal nanoparticles
dispersed on the hydroxide; then separating the noble metal nanoparticles and the
hydroxide from the mixture before calcining the hydroxide into an oxide of aluminum
or silicon.