(735i) Preparation and Catalytic Performance of Au/3DOM Co3O4 for the Oxidative Removal of CO and BTX | AIChE

(735i) Preparation and Catalytic Performance of Au/3DOM Co3O4 for the Oxidative Removal of CO and BTX


Dai, H. - Presenter, Beijing University of Technology
Deng, J., Beijing University of Technology

Preparation and catalytic
performance of Au/3DOM Co3O4 for the oxidative removal of
CO and BTX


Yuxi Liu, Jiguang Deng,
Hongxing Dai*

Department of Chemistry and Chemical Engineering, College of
Environmental and Energy Engineering, Beijing University of Technology, Beijing
100124, PR China. E-mail: hxdai@bjut.edu.cn.

is catalytically active for the oxidation of CO and volatile organic compounds
(VOCs) [1,2]. The Co3O4
material with a mesoporous structure possesses high surface area and developed
porous structure, hence favoring the improvement in catalytic performance. In
recent years, supported gold catalysts attract much attention. The factors,
such as Au particle size and support nature, influence the catalytic activities
of supported Au catalysts. Here, we report the preparation and catalytic
applications of three-dimensionally ordered mesoporous (3DOM) Co3O4-supported
gold catalysts for the oxidation of CO and BTX (benzene, toluene, and xylene).

3DOM Co3O4 and xAu/3DOM Co3O4 (x =
3.7-9.0 wt%) catalysts were prepared using the
nanocasting strategy with KIT-6 as hard template and bubble-assisted polyvinyl
alcohol-protected reduction method[3] with NaBH4
as reducing agent, respectively. Techniques, such as XRD, BET, TEM, XPS, and H2-TPR,
were used to characterize the physicochemical properties of the materials, and
their catalytic activities were evaluated for the oxidation of CO and BTX. The
feedstock was 1% CO + 99% air (space velocity (SV) = 60 000 mL/(g h)) or 1000
ppm BTX + O2 + N2 (balance) (SV = 20 000 mL/(g h)).

XRD results indicate that the 3DOM Co3O4 and xAu/3DOM Co3O4 samples exhibited a cubic
crystal structure. The BET surface areas of 3DOM Co3O4 and xAu/3DOM Co3O4 were 94 and 91-93 m2/g,
respectively. TEM results indicate that the 3DOM Co3O4 and 6.5Au/3DOM Co3O4 samples displayed a good quality of 3DOM
architecture, a pore size of ca. 4 nm, and an Au particle size of 2-5 nm°£XPS and H2-TPR results reveal that the
surface Co2+/Co3+ and Oads/Olatt
molar ratios and low-temperature reducibility of 6.5Au/3DOM Co3O4were higher
or better than those of 3DOM Co3O4. Catalytic activity
evaluation results show that the 6.5Au/3DOM Co3O4
sample performed the best, with the T90% values being -45,189, 138,
and 162 oC, lower than those of 3DOM Co3O4 by 115, 50, 67, and 39 oC,
respectively. Therefore, it is concluded that the excellent catalytic performance
of 6.5Au/3DOM Co3O4
was associated with its larger surface area, developed pore structure, higher oxygen
adspecies concentration, and better low-temperature reducibility as well as
strong Au-3DOM Co3O4

The work was financially
supported by the NSF of China (Nos. 20973017 and 21077007).


[1] X. Xie, Yong Li, Z.Q. Liu, M. Haruta, Wenjie Shen. Nature,
2009, 458, 746-749.

[2] L.H. Hu, Q. Peng, Y.D. Li. J. Am. Chem. Soc., 2008, 130, 16136¨C16137.

[3] M.
Comotti, W.C. Li, B. Spliethoff, F. Sch¨¹th. J. Am. Chem. Soc., 2006,
128, 917-924.



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