Effect of P on hydrodeoxygenation performance of Ni–P/SiO2 catalysts for upgrading of m-cresol. (16th November 2022)

• Record Type: Journal Article
• Authors: Wang, Jing; Zhang, Mei; Li, Feng; Wang, Huan; Chen, Yanguang; Song, Hua
• Is Part Of: New journal of chemistry. Volume 46:Number 47(2022)
• Page Start: 22672
• Page End: 22685
• Publication Date: 2022-11-16
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/d2nj03482d
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : Ni–P/SiO2 -1.0 exhibited much higher MCH selectivity than Ni/SiO2, which is due to the increase in acidity caused by the introduction of P. Abstract : To deeply understand the role of P in hydrodeoxygenation (HDO), SiO2 -supported Ni and Ni–P catalysts with different P/Ni ratios ( x ) were prepared. The as-prepared samples were characterized by various characterization methods. The HDO activity and product distribution over the Ni/SiO2 and N–P/SiO2 - x were compared and the effects of x on the structure, acidity, formation mechanism of active phases and HDO performance were studied taking m -cresol HDO as a model reaction. The results showed that the introduction of P promotes the formation of smaller active sites and contributes to the creation of weak and medium strength acid sites through the formation of P–OH groups and Ni δ + in Ni2 P. HDO over the Ni/SiO2 catalyst occurs mainly via the hydrogenation (HYD) route with 3-methyl-cyclohexanol (3-MCHnol) as the main product. However, for Ni–P/SiO2 - x catalysts, methyl-cyclohexane (MCH) selectivity increases first and then decreases with the increase of x, reaching a maximum of 95% at x = 1. The acidity generated by the introduction of P contributes to increased MCH selectivity, while the dehydration of 3-MCHnol to MCH occurs mainly on acid sites. However, the excessively high P content ( x ≥ 2.0) leads to a significant increase of MB (toluene) selectivity, which is associated with the increase in Ni(i ) sites. About 100% m -cresol conversion was achieved with Ni–P/SiO2 -1.0 when the m -cresol (g)/catalyst (g) ratio was 3, with MCH (99.4%) as the major product, showing great promise for deep HDO catalysis.