Issue 5, 1994

New route for dispersion of inorganic salts onto the channel surfaces of microporous crystals: high dispersion of CuCl2 in zeolites using a microwave technique

Abstract

A series of CuCl2–zeolites with a weight ratio of CuCl2·2H2O:zeolites of 0.10–0.80 have been prepared. After the reaction of CuCl2·2H2O with zeolite in a microwave oven for 10–20 min at ambient temperature, the CuCl2–zeolites (CuCl2·2H2O:NaZSM-5 = 0.10–0.50; CuCl2·2H2O:NaY = 0.1–0.60) showed only those X-ray peaks assigned to zeolites, the characteristic peaks of the CuCl2·2H2O having disappeared completely, which suggests that the CuCl2 is highly dispersed in the channels of NaZSM-5 and NaY zeolites. Similar phenomena were observed for the samples of CuCl2–silicalite-l, AuCl3–NaY, AuCl3–NaZSM-5, NiCl2–NaZSM-5, RuCl3–NaY, Li2SO4–AIPO4-11. The n-hexane isotherms of CuCl2–NaZSM-5 treated in a microwave oven exhibited a higher adsorption pressure to reach saturated adsorption of n-hexane, compared with those of NaZSM-5 and a mechanical mixture of NaZSM-5 and CuCl2·2H2O without treatment in a microwave oven. IR spectra of CO adsorbed on CuCl2–NaZSM-5 treated in a microwave oven showed much stronger adsorption bands than those of CuZSM-5 ion-exchanged by CuCl2 solution, which indicates that the concentration of Cu2 +(CO) and Cu+(CO) on the CuCl2–NaZSM-5 is larger than those on the CuZSM-5. Furthermore, CuCl2·2H2O–NaZSM-5 (weight ratio 0–0.50) exhibited no peak at the melting point of CuCl2 in DTA curves, because the CuCl2 was highly dispersed in the channels of NaZSM-5. However, increasing the CuCl2·2H2O loading in NaZSM-5 up to 0.60, beyond the high-dispersion capacity, the DTA curve exhibited peaks at 770 K assigned to the melting point of CuCl2 due to residual crystalline CuCl2.

Article information

Article type
Paper

J. Mater. Chem., 1994,4, 735-739

New route for dispersion of inorganic salts onto the channel surfaces of microporous crystals: high dispersion of CuCl2 in zeolites using a microwave technique

F. Xiao, W. Xu, S. Qiu and R. Xu, J. Mater. Chem., 1994, 4, 735 DOI: 10.1039/JM9940400735

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Spotlight

Advertisements