The high dispersion of CuCl{sub 2} in ZSM-5 by using microwave method
- Jilin Univ., Changchun (China). Dept. of Chemistry
Three preparation methods of ZSM-5 supported copper were studied. The first sample is the mechanical mixture of CuCl{sub 2}{center_dot}2H{sub 2}O with NaZSM-5 (Cu+ZSM-5), the second sample is the mechanical mixture of CuCl{sub 2}{center_dot}2H{sub 2}O with NaZSM-5 followed by microwave treatment (Cu/ZSM-5), and the third sample is copper ion exchanged with NaZSM-5 (CuZSM-5). All the samples were characterized by XRD, DTA, and n-hexane adsorption. Cu+ZSM-5 samples showed characteristic XRD peaks of both NaZSM-5 and CuCl{sub 2} {center_dot} 2H{sub 2}O and Cu/ZSM-5 samples showed only NaZSM-5 XRD peaks; these results suggest that CuCl{sub 2} {center_dot} 2H{sub 2}O no longer exists in the crystalline state in Cu/ZSM-5 samples, possibly in a highly dispersed state. DTA experiments showed that Cu+ZSM-5 samples did exhibit the melting point of CuCl{sub 2} and Cu/ZSM-5 did not. Furthermore, as compared with Cu+ZSM-5 and CuZSM-5, the n-hexane adsorption on Cu/ZSM-5 samples require higher n-hexane pressure to reach the saturated adsorption; these results suggest that the copper salt has entered the zeolite channels during microwave treatment, resulting in the change of channel circumstance for ZSM-5 zeolite. All these results suggest that microwave technique is a potential method for preparing highly dispersed metal salts in the channels or cages of zeolites. The copper ion-exchanged ZSM-5 zeolite is a very effective catalyst for the selective reduction of NO by hydrocarbons.
- OSTI ID:
- 106178
- Report Number(s):
- CONF-940411--; ISBN 1-55899-239-1
- Country of Publication:
- United States
- Language:
- English
Similar Records
Direct catalytic decomposition of nitric oxide. Quarterly technical progress report No. 13, October--December 1994
Direct catalytic decomposition of nitric oxide. Final report