A bifunctional Zn/ZrO-SAPO-34 catalyst for the conversion of syngas to lower olefins induced by metal promoters

• Published in: New journal of chemistry 2023-04, Vol.47 (15), p.7143-7153
• Main Authors: Raveendra, G, Mitta, Harisekhar, Linglwar, Shrutika, Balla, Putrakumar, Rajendran, Rajesh, Ponnala, Bhanuchander, Safdar, M, Vijayanand, Perupogu
• Format: Article
• ISSN: 1144-0546; 1369-9261
• DOI: 10.1039/d3nj00142c

Syngas (CO/H 2 ) was selected as a non-petroleum carbon source and transformed into lower olefins (C 2 -C 4 &z.dbd; ), aromatics (BTX), liquefied petroleum gas (LPG), and gasoline (C 5 -C 11 ), respectively. The CO-precipitation method was used to synthesize different metal-doped Zn/ZrO 2 -M (M = Ce, La, Mg, and Sr) catalysts. These catalysts were combined with SAPO-34 zeolite to investigate the catalytic performance in a high-pressure dual-bed fixed reactor. The catalysts were characterized by using XRD, N 2 -adsorption, H 2 -TPR, NH 3 -TPD, CO 2 -TPD, laser Raman, CO-TPD, XPS, and SEM techniques. Adding Ce promoter to the Zn-ZrO 2 catalyst improved the number of active sites, which were CO and H 2 adsorption sites, while weakening the interaction between Zn and ZrO 2 . Due to its homogeneous element distribution, the Ce-doped Zn/ZrO 2 catalyst had superior catalytic performance. There was also a synergistic effect with Ce-doped Zn/ZrO 2 and SAPO-34 zeolite. Furthermore, the optimal Ce-doped Zn/ZrO 2 -SAPO-34 bifunctional catalyst exhibited 20% CO conversion and 79% lower olefin selectivity while remaining stable for 100 h without activity loss. Because of its stable catalytic performance under industrially relevant conditions, the bifunctional catalyst is a promising candidate for industrial applications. Syngas (CO/H 2 ) was selected as a non-petroleum carbon source and transformed into lower olefins (C 2 -C 4 &z.dbd; ), aromatics (BTX), liquefied petroleum gas (LPG), and gasoline (C 5 -C 11 ), respectively.