Preparation of Ce and Mn substituted hexaaluminate catalysts for natural gas combustion by reverse microemulsion;

Catalytic Performance of La_(0.8)Sr_(0.2)FeMn_(1.5)Al_(9.5)O_(19-δ) Hexaaluminate-typed Aerosol Catalysts;

Progress in research for new function materials of compound oxides hexaaluminate;

The parameters which determine the type of hexaaluminates are the charge and radius of the large cations in the conduction layer.

Series of hexaaluminates LaMn_xAl_(12-x)O_(19+σ) doped with Mn (Here x is 0, 0.

There are three major types of catalysts for catalytic combustion,among them the noble metal catalysts have excellent performances but are expensive,and the perovskite-type and hexaaluminates catalysts are inexpensive and exhibit a good high temperature catalytic activity,so they are more attractive.

The catalysts with good form of crystalline hexa-aluminate can be obtained by calcination at 1 200 ℃ for 4 h.

The catalysts for catalytic combustion of methane,hexa-aluminate BaAl_(12)O_(19-α)and its derivtive,BaMnAl_(11)O_(19-α),in which Mn~(2+) partially substituted for Al~(3+),were prepared by reverse microemulsion mediated NH_4OH coprecipitation and conventional NH_4OH coprecipitation methods.