Harnessing Ammonia as a Hydrogen Carrier for Integrated CO 2 Capture and Reverse Water-Gas Shift

• Published in: ACS applied materials & interfaces 2024-12, Vol.16 (51), p.70575-70586
• Main Authors: Jo, Seongbin, Woo, Jin Hyeok, Kim, Ju Eon, Kim, Tae Young, Ryu, Ho-Jung, Hwang, Byungwook, Kim, Jae Chang, Lee, Soo Chool, Gilliard-AbdulAziz, Kandis Leslie
• Format: Article
• Language: English
• ISSN: 1944-8244; 1944-8252
• DOI: 10.1021/acsami.4c16632

In this paper, a concept of integrated CO capture and reverse water-gas shift (ICCrWGS) process was proposed using NH as the H carrier. The CO efficiency and total thermal energy consumption for the conventional rWGS, ICCrWGS using H (H -ICCrWGS) and NH (NH -ICCrWGS), were calculated. ICCrWGS using H and NH was conducted over the thermally stable Ni/CaZr dual-function materials (DFMs). NH decomposition, CO capture capacity, CO conversion, and CO selectivity were addressed at different reaction temperatures, and the optimal temperature was determined to be 650 °C. The Ni/CaZr DFMs exhibited stable CO capture capacity and CO productivity during ICCrWGS using the NH carrier. A carbonate spillover mechanism for CO production over the Ni/CaZr DFMs in NH -ICCrWGS was proposed using in situ diffuse reflectance infrared Fourier transform spectroscopy. It was found that CO is produced from the bridged bidentate carbonate route in the Ni-CaO interface.