Catalytic combustion of dimethyl ether(DME)over hexaaluminate catalyst BaNi

0.2

Mn

0.8

Al

11

O

19-δ

has been investigated.The catalysts were prepared with the sol-gel method and reverse microemulsion method respectively and characterized by thermogravimetry-differential thermal analysis

X-ray diffraction and transimission electron microscope.It was found that the formation of Mn

Ni modified hexaaluminate was a relatively slow process via two solid state reactions and spinel structure was a transition phase.At the same calcined temperature and time

the catalyst prepared with the reverse microemulsion method could form the hexaaluminate phase more easily than that prepared with the sol-gel method.The catalyst BaNi

0.2

Mn

0.8

Al

11

O

19-δ

prepared with the reverse micro-emulsion method appeared a plate-like morphology

while it appeared a needle-like morphology when using the sol-gel method.The catalytic activities of catalysts BaNi

0.2

Mn

0.8

Al

11

O

19-δ

prepared with two different methods for DME combustion were tested.It showed that catalyst prepared with the reverse microemulsion method had better catalytic activity

i.e

.

T

10%

of DME had decreased by 45℃

about 90% conversion of diemthyl ether at 380℃.