Role of Bronsted and Lewis acid sites on Ni/TiO2 catalyst for vapour phase hydrogenation of levulinic acid: Kinetic and mechanistic study

被引：124
|
作者：
Kumar, Velisoju Vijay [1 ,2 ]
Naresh, Gutta [1 ,2 ]
Sudhakar, Medak
Tardio, James [2 ]
Bhargava, Suresh K. [2 ]
Venugopal, Akula [1 ]
机构：
[1] Indian Inst Chem Technol, Inorgan & Phys Chem Div, Hyderabad 500007, Andhra Pradesh, India
[2] RMIT Univ, Sch Appl Sci, CAMIC, Melbourne, Vic 3001, Australia
来源：
APPLIED CATALYSIS A-GENERAL | 2015年 / 505卷
关键词：
Levulinic acid; gamma-Valerolactone; Hydrogenation; DRIFTS; Nickel; Titania; GAMMA-VALEROLACTONE; SELECTIVE HYDROGENATION; DEPOSITION-PRECIPITATION; BIMETALLIC CATALYSTS; FORMIC ACIDS; BIOMASS; CONVERSION; EFFICIENT; SOLVENT; SUPPORT;
D O I：
10.1016/j.apcata.2015.07.031
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The TiO2 supported Ni catalysts were investigated for vapour phase hydrogenation of aqueous levulinic acid at ambient pressure. Ni/TiO2 demonstrated high selectivity of gamma-valerolactone (GVL) compared to noble metal (Pt, Pd, Ru) catalysts. The surface acid sites played an important role on the product distribution. Pyridine adsorbed DRIFT spectra revealed that the Lewis acid sites on Ni/TiO2 were responsible for high selectivity of gamma-valerolactone. In contrast, the Bronsted acid sites are prone to ring opening of gamma-valerolactone to produce valeric acid and hydrocarbons. The physicochemical characteristics of Ni/TiO2 were correlated with gamma-valerolactone rates. Based on the kinetic study a mechanism has been proposed. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码：217 / 223
页数：7
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