A bifunctional Zn/ZrO2–SAPO-34 catalyst for the conversion of syngas to lower olefins induced by metal promoters. (23rd March 2023)

• Record Type: Journal Article
• Authors: Raveendra, G.; Mitta, Harisekhar; Linglwar, Shrutika; Balla, Putrakumar; Rajendran, Rajesh; Ponnala, Bhanuchander; Safdar, M.; Vijayanand, Perupogu
• Is Part Of: New journal of chemistry. Volume 47:Number 15(2023)
• Page Start: 7143
• Page End: 7153
• Publication Date: 2023-03-23
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/d3nj00142c
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : Syngas (CO/H2 ) was selected as a non-petroleum carbon source and transformed into lower olefins (C2 –C4  ), aromatics (BTX), liquefied petroleum gas (LPG), and gasoline (C5 –C11 ), respectively. Abstract : Syngas (CO/H2 ) was selected as a non-petroleum carbon source and transformed into lower olefins (C2 –C4  ), aromatics (BTX), liquefied petroleum gas (LPG), and gasoline (C5 –C11 ), respectively. The CO-precipitation method was used to synthesize different metal-doped Zn/ZrO2 -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, N2 -adsorption, H2 -TPR, NH3 -TPD, CO2 -TPD, laser Raman, CO-TPD, XPS, and SEM techniques. Adding Ce promoter to the Zn–ZrO2 catalyst improved the number of active sites, which were CO and H2 adsorption sites, while weakening the interaction between Zn and ZrO2 . Due to its homogeneous element distribution, the Ce-doped Zn/ZrO2 catalyst had superior catalytic performance. There was also a synergistic effect with Ce-doped Zn/ZrO2 and SAPO-34 zeolite. Furthermore, the optimal Ce-doped Zn/ZrO2 –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.