Zirconia can be coated on zeolite NaY to modify the surface acid- basic properties of the zeolite and to form novel porous materials with framework of the zeolite by microwave radiation. The dispersion threshold of ZrO2 on zeolite NaY is found to be about 10%. On this new material ZrO2/NaY, N-nitrosopyrrolidine (NPYR) is easier to degrade than on either parant zeolite or zirconia. When this degradation process occurrs in air, the formation of NOx can be dramatically suppressed. It is favorable to protect environment and public health.

Key words: CATALYTIC ACTIVITY, DEGRADATION, NITROSAMINE P, TEMPERATURE PROGRAMMING SURFACE REACTION, ZEOLITE, ZIRCONIUM OXIDE, PYRROLIDINE P, MICROWAVE RADIATION