Activity and Stability of Perovskite-Type Oxide LaCoO3 Catalyst in Lignin Catalytic Wet Oxidation to Aromatic Aldehydes Process
详细信息 查看全文
- 作者：Haibo Deng ; Lu Lin ; Yong Sun ; Chunsheng Pang ; Junping Zhuang ; Pingkai Ouyang ; Jingjiang Li ; Shijie Liu
- 刊名：Energy & Fuels
- 出版年：2009
- 出版时间：January 22, 2009
- 年：2009
- 卷：23
- 期：1
- 页码：19-24
- 全文大小：196K
- 年卷期：v.23,no.1(January 22, 2009)
- ISSN：1520-5029
文摘
The perovskite-type oxide catalyst LaCoO3, prepared by the sol−gel method, was tested for catalytic wet oxidation (CWAO) of lignin to aromatic aldehydes. The lignin conversion and yield of each aromatic aldehyde were significantly enhanced by the catalytic process, compared to the noncatalytic process. A mechanism involving the reaction of lignin molecules with adsorbed oxygen surface sites, Co(surf)3+O2−, was proposed on the basis of experimental observations, yielding the cycle of Co(surf)3+ → Co(surf)2+ → Co(surf)3+O2− → Co(surf)3+. The formation rates of the intermediates quinonemethide and hydroperoxide were the rate-determining steps. The activity and perovskite-type structure of the LaCoO3 catalyst did not undergo any obvious changes after the five successive reactions.