CuAlCl₄ doped MIL-101 as a high capacity CO adsorbent with selectivity over N₂

Abstract

A CuAlCl₄ doped metal organic framework, CuAlCl₄@MIL-101, was prepared by introducing CuAlCl₄ into the pores of MIL-101 for the selective adsorption of CO over N₂. The CuAlCl₄ molecules were evenly distributed into various pores sizes and did not change the intrinsic structure of the MIL-101. Isotherms for CO and N₂ adsorption at 298 K showed that the CO capacity on CuAlCl₄@MIL-101 was much higher than that on virgin MIL-101, whereas the N₂ capacity decreased. The selectivity for CO over N₂ improved from 4.64 to 31.5 at 298 K and 1 bar. The CuAlCl₄@MIL-101 adsorbent displayed outstanding CO adsorption stability and the adsorbent could be regenerated by applying a simple vacuum of 4 mmHg.

Keywords

metal organic framework / CO adsorbent / high stability / high selectivity / CuAlCl₄

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Acknowledgments

We thank Xiaoxiao Chen for assistance in the synthesis, Yong Chen for his help with the adsorption measurements, and Yu Jin for BET surface area analysis.

RIGHTS & PERMISSIONS

2014 Higher Education Press and Springer-Verlag Berlin Heidelberg