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Studies on CuCe 0.75 Zr 0.25 O x preparation using bacterial cellulose and its application in toluene complete oxidation
Author(s) -
Yan Ningna,
Hao Qinglan,
Zhao Chenchen,
Yang Deyu,
Dou Baojuan,
Hui K.S.,
Hui Kwun Nam
Publication year - 2019
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201900727
Subject(s) - toluene , catalysis , adsorption , chemistry , cellulose , calcination , specific surface area , catalytic oxidation , nuclear chemistry , inorganic chemistry , organic chemistry
A series of CuCe 0.75 Zr 0.25 O x catalysts (CCZ) were synthesized based on the environmental‐friendly bacterial cellulose (BC) by using the sol‐gel method. The corresponding synthesis mechanism, physicochemical properties of the catalysts and catalytic performances for toluene oxidation were comprehensively studied. In the presence of BC without sugar, the CCZ−A synthesized by ethanol‐gel exhibits better catalytic activity than the CCZ−W synthesized by water‐gel, which may be due to the different roles of BC in different solvents. However, it is worth noting that the graft copolymerization between BC and active metal (Ce 4+ , Cu 2+ ) is the same process in both water‐gel and ethanol‐gel. The activity of CCZ‐SW synthesized by water‐gel using BC with sugar is obviously higher than that of CCZ−W and CCZ−A. The temperature of complete degradation of toluene over CCZ‐SW is 205 °C, which is 35 °C lower than that of CCZ−W. The results from BET, Raman and H 2 ‐TPR indicate that the larger the specific surface area, the more oxygen vacancies and better low‐temperature reducibility, that are mainly responsible for the excellent activity of CCZ‐SW. The existence of sugar in BC could hinder the agglomeration of active metal particles during the calcination process. Combined with the results of in situ DRIFT, the adsorbed toluene on the catalyst surface is oxidized into alkoxide, aldehydic and carboxylic acid species as intermediates before the complete oxidation into CO 2 and H 2 O.[1][M. Konsolakis, 2013]