乙酰丙酸
催化作用
转化(遗传学)
化学
无机化学
金属
材料科学
化学工程
有机化学
生物化学
工程类
基因
作者
Serena Esposito,Brigida Silvestri,Carmelina Rossano,Valeria Vermile,Claudio Imparato,Maela Manzoli,Barbara Bonelli,Vincenzo Russo,Éric M. Gaigneaux,Antonio Aronne,Martino Di Serio
标识
DOI:10.1016/j.apcatb.2022.121340
摘要
The transformation of γ-valerolactone (GVL) into levulinic acid (LA) requires the use of bifunctional catalysts allowing the hydrogenation and lactonization steps to occur. The aim of this study is to clarify the role played by both redox (Ru) and acid (Nb) sites of the ruthenium-niobium-silicon mixed oxides catalysts, synthesized by sol-gel route, when this reaction is performed in mild conditions. The catalytic performances of the materials are related to an in-depth morphologic and structural characterization, demonstrating that the interaction between the two metals and their relative amount and dispersion are crucial in determining their activity. The results confirm the hydrogenation-dehydration consecutive reaction network and evidence the possibility to selectively produce either GVL or the intermediate γ-hydroxypentanoic acid by an accurate choice of the catalyst composition. • Ru-Nb-Si bifunctional catalysts are prepared by one pot sol-gel synthesis. • The surface properties of Ru-Nb-Si catalysts can be controlled by the Nb/Ru ratio. • Lewis and Brønsted sites abundance and strength are associated with surface Nb. • 100% Selectivity to γ-hydroxypentanoic acid is obtained with Nb-free catalyst. • The Ru availability and the acid site distribution affect the γ-valerolactone yield.
科研通智能强力驱动
Strongly Powered by AbleSci AI