Perovskite hollow nanospheres for the catalytic wet air oxidation of lignin

doi:10.1016/S1872-2067(12)60691-3

Chinese Journal of Catalysis ›› 2013, Vol. 34 ›› Issue (10): 1811-1815.DOI: 10.1016/S1872-2067(12)60691-3

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Perovskite hollow nanospheres for the catalytic wet air oxidation of lignin

Peng Gao^a,b, Changzhi Li^a, Hua Wang^a, Xiaodong Wang^a, Aiqin Wang^a

a State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China;
b University of Chinese Academy of Sciences, Beijing 100049, China

Received:2013-07-10 Revised:2013-08-16 Online:2013-09-29 Published:2013-09-29
Contact: Aiqin Wang
Supported by:
This work was supported by the National Natural Science Foundation of China (21003121 and 21076211).

Abstract

Abstract:

A urea-assisted solvothermal-calcination method was used to prepare LaFe_xMn_1-xO₃ and La_0.9Sr_0.1MnO₃ hollow nanospheres, and their crystal phase, morphology, and specific surface area properties were analyzed by X-ray diffraction, transmission electron microscopy, and nitrogen adsorption-desorption isotherms. These materials were then evaluated as catalysts for the catalytic wet air oxidation (CWAO) of lignin, and showed much better catalytic performance than perovskite prepared by the traditional sol-gel method. The structure of the hollow nanospheres has been suggested as the reason of this higher catalytic activity. For the CWAO reaction at 120 ℃ and 0.2 MPa O₂, the conversion of lignin was greater than 80% after 1 h. Analysis of the ions leaching from the material following the completion of the reaction showed that the catalysts were very stable under the reaction conditions because of their perovskite phase structure.

Key words: Perovskite-type oxide, Lignin, Catalytic wet air oxidation, High catalytic activity, Low leaching

Peng Gao, Changzhi Li, Hua Wang, Xiaodong Wang, Aiqin Wang. Perovskite hollow nanospheres for the catalytic wet air oxidation of lignin[J]. Chinese Journal of Catalysis, 2013, 34(10): 1811-1815.

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Perovskite hollow nanospheres for the catalytic wet air oxidation of lignin

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