· 논문명 : Enhanced CO adsorption via NO + NH3 reduction-assisted solid-state precipitation of CuCl in Y zeolite

· 저   자 : Hyunwook Kim, Hyun Min Chae, Jiwon Yim, Changhwan Yoo, Chan Hyun Lee*, Ki Bong Lee*

· 게재지 : Chemical Engineering Journal (2026, 536, 176018)

· 초록

Effective adsorptive separation is crucial for CO recovery. Conventional CO adsorbents have been synthesized by physically mixing CuCl,

known for its strong CO affinity, with support materials like activated carbon, zeolites, alumina, and metal-organic frameworks, 

followed by thermal treatment. However, CuCl dispersion is often restricted to the support surface, and its  effectiveness is not 

clearly understood. In this study, a novel solid-state precipitation method is proposed to enable the  formation of highly dispersed 

CuCl nanoparticles within zeolite particles. This method employs the reduction half-cycle of  ammonia-selective catalytic reduction 

to selectively reduce the ion-exchanged Cu2+ to Cu+ within the zeolite. The resulting adsorbent exhibits a CO uptake of 2.85 mmol g-1

(13.3 mmol g-1Cu, normalized to the total Cu loading) at 25 ◦C and 101.3 kPa, significantly outperforming samples synthesized via

conventional methods. Moreover, the developed adsorbent exhibits excellent cyclic stability over repeated adsorption–desorption 

cycles. Isosteric heat of adsorption calculations, CO temperature-programmed desorption, and in situ infrared spectroscopy help to

elucidate the role of highly dispersed CuCl, confirming its significant effect on the CO adsorption characteristics. This study successfully

introduces a robust solid-state precipitation method for obtaining highly dispersed CuCl nanoparticles within the intraparticle regions 

of zeolite, which exhibits promising potential as an efficient CO adsorbent.