Issue 1, 2016

Downsizing the K-CHA zeolite by a postmilling-recrystallization method for enhanced base-catalytic performance

Abstract

Herein, we report the preparation of potassium chabazite (K-CHA) zeolite nanocrystals with enhanced base-catalytic performance using a bead-milling and postmilling-recrystallization technique. Particles as small as 60 nm were produced by this approach. The surface area of the downsized K-CHA samples showed a significant improvement, increasing from 11 m2 gāˆ’1 to 65 m2 gāˆ’1. The catalytic activity of the K-CHA nanocrystals in the Knoevenagel condensation of benzaldehyde with ethyl cyanoacetate was found to be twofold higher than that of the raw and the milled samples, achieving 80% product yield within a reaction time of 60 min. In addition, the enhanced catalytic behavior of the K-CHA nanocrystals, despite possessing low surface area relative to the intermediate milled sample, is attributable to the postmilling-recrystallization step, which played a pivotal role in restoring the crystallinity to around 80%.

Graphical abstract: Downsizing the K-CHA zeolite by a postmilling-recrystallization method for enhanced base-catalytic performance

Supplementary files

Article information

Article type
Paper
Submitted
04 Aug 2015
Accepted
31 Oct 2015
First published
06 Nov 2015

New J. Chem., 2016,40, 492-496

Author version available

Downsizing the K-CHA zeolite by a postmilling-recrystallization method for enhanced base-catalytic performance

C. Anand, T. Kaneda, S. Inagaki, S. Okamura, H. Sakurai, K. Sodeyama, T. Matsumoto, Y. Kubota, T. Okubo and T. Wakihara, New J. Chem., 2016, 40, 492 DOI: 10.1039/C5NJ02052B

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