| Cu/ZSM-5 zeolite catalyst was produced by mechanical alloying and their microstructures together with catalytic reaction mechanism for NO removal were investigated by means of X-ray diffraction, electron microscopy, energy dispersive X-ray spectrometry, and in situ Fourier transform infrared spectroscopy. The results were compared with those from copper ion-exchanged ZSM-5 zeolite catalyst. During mechanical alloying, Copper remains in crystalline and a part of ZSM-5 zeolite transformed to amorphous phase. In the copper ion-exchanged ZSM-5 catalyst, however, copper was found to be noncrystalline, while the ZSM-5 zeolite was crystalline. Cu/ZSM-5 zeolite catalyst produced by mechanical alloying showed a high efficiency in reduction of NO at 250℃. This indicates that at temperatures lower than 300℃ the mechanically alloyed Cu/ZSM-5 catalyst is more effective than Copper ion-exchanged ZSM-5 catalyst whose high efficiency for NO deduction was achieved at 360℃. |
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