2
78
W. Fan et al. / Journal of Catalysis 266 (2009) 268–278
evacuation temperature (Fig. 17C). As expected, both the 1450-
of the Chinese Academy of Sciences. T.T. thanks the support of
the Ministry of Education, Culture, Science and Technology of
Japan.
ꢁ
1
ꢁ1
cm and the 1540-cm bands became invisible for H-USY when
the evacuation temperature was increased to 400 °C because of its
low acid strength (Fig. 1S). Nevertheless, the intensity of the 1450-
ꢁ
1
ꢁ1
cm band was significantly higher than that of the 1540-cm
Appendix A. Supplementary material
band below 300 °C, showing that Lewis acid sites were predomi-
nant in H-USY.
In combination with the NH
that moderately strong Brönsted acid sites, corresponding to the
NH desorption peaks centered between 250 and 400 °C, might
3
-TPD results, it could be inferred
3
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