DRIFTS and UV-vis DRS study of valeric acid ketonization mechanism over ZrO2 in hydrogen atmosphere

被引：28
|
作者：
Panchenko, V. N. [1 ]
Zaytseva, Yu A. [1 ]
Simonov, M. N. [1 ]
Simakova, I. L. [1 ]
Paukshtis, E. A. [1 ]
机构：
[1] Boreskov Inst Catalysis, Novosibirsk 630090, Russia
来源：
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL | 2014年 / 388卷
关键词：
Ketonization; Mechanism; Valeric acid; 5-Nonanone; DRIFTS; UV-vis DRS; ACETIC-ACID; CARBOXYLIC-ACIDS; LACTIC-ACID; CATALYTIC KETONIZATION; INFRARED-SPECTROSCOPY; CERIA-ZIRCONIA; OXIDES; SURFACES; KETONES; ADSORPTION;
D O I：
10.1016/j.molcata.2013.11.012
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：
Adsorption of valeric acid and 5-nonanone on zirconia was investigated by DRIFTS and UV-vis DRS methods. Physical adsorbed and chemisorbed acid and ketone species have been found. Based on the experimental data obtained in this work and on DFT calculations reported in the literature two beta-ketoacid routes depending on surface carboxylate intermediates were proposed: (i) via interactions of surface monomolecular monodentate valerate with either monomolecular bridging bidentate or chelating bidentate and (ii) via interactions of two monodentates coordinated to the same Zr cation. The relative contribution of each of them in the overall ketone formation over metal oxide surfaces depends on the reaction conditions. (c) 2013 Elsevier B.V. All rights reserved.
引用
收藏
页码：133 / 140
页数：8
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