1
34
M. Trejda et al. / Catalysis Today 187 (2012) 129–134
1
00
material surface. The presence of niobium in the structure of matrix
enhanced the transformation of thiols to sulphonic species via oxi-
dation by hydrogen peroxide in comparison with silica material. It
is the same effect as in case of one-pot synthesis in the presence of
I
II III
I
II III
I
II III
8
0
0
0
0
0
MPTMS and H O2 [31]. However, the stability of sulphonic groups
2
6
4
2
was not depended on the chemical composition of SBA-15 mate-
rial testifying a low strength interaction of modifier with niobium.
It is contrary to the previous results related to one-pot synthesis
[
31]. The samples prepared within this work were active in glycerol
esterification process with acetic acid. They allow obtaining ca. 40%
selectivity to triacetylglycerol, i.e. valuable product for biodiesel
composition. Nevertheless, the catalysts were not stable during the
reuse tests leading to the decrease of yield of triacetylglycerol.
B
C
A
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Fig. 6. Glycerol conversion in esterification of glycerol with acetic acid after I, II and
III run on: (A) MP(1)/SBA-15; (B) MP(1)/NbSBA-15-64; (C) MP(1)/NbSBA-15-32.
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