Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Structural studies of mesoporous ZrO$_{2}$-CeO$_{2}$ and
  ZrO$_{2}$-CeO$_{2}$/SiO$_{2}$ mixed oxides for catalytical applications   In this work the synthesis of ZrO$_{2}$-CeO$_{2}$ and
ZrO$_{2}$-CeO$_{2}$/SiO$_{2}$ were developed, based on the process to form
ordered mesoporous materials such as SBA-15 silica. The triblock copolymer
Pluronic P-123 was used as template, aiming to obtain crystalline single phase
walls and larger specific surface area, for future applications in catalysis.
SAXS and XRD results showed a relationship between ordered pores and the
material crystallization. 90% of CeO$_{2}$ leaded to single phase homogeneous
ceria-zirconia solid solution of cubic fluorite structure (Fm$\bar{3}$m). The
SiO$_{2}$ addition improved structural and textural properties as well as the
reduction behavior at lower temperatures, investigated by XANES measurements
under H$_{2}$ atmosphere.

15
The categories of this paper are: nucl-ex
35
The categories of this paper are: mtrl-th
25
The categories of this paper are: patt-sol
21
The categories of this paper are: adap-org
16
The categories of this paper are: stat
18
The categories of this paper are: econ
19
The categories of this paper are: eess
14
The categories of this paper are: math-ph
12
The categories of this paper are: nucl-th
10
The categories of this paper are: q-bio
17
The categories of this paper are: q-fin
6
The categories of this paper are: astro-ph
1
The categories of this paper are: cs
8
The categories of this paper are: hep-ex
29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys