ACS Catalysis
Research Article
3020 analyzer. All of the samples were outgassed at 250 °C for
4 h under vacuum to remove moisture and volatile impurities
before the measurements. H2-TPR was performed using a BEL-
CAT-B-82 apparatus (BEL Japan Inc., Osaka, Japan). The
temperature was increased from room temperature to 750 °C at
a rate of 5 °C min−1 under a flow of 10% H2/Ar (40 mL min−1)
after pretreatment at 300 °C. H2 chemisorption was also
performed on the BEL-CAT-B-82 instrument. Each sample was
reduced in situ under a flow of H2 at 450 °C, purged with He
for 2 h, and cooled to 50 °C before the H2 chemisorption;
finally, 5% H2/Ar pulses were injected into the sample tube
until the hydrogen signal intensity was unchanged. NH3
temperature-programmed desorption (NH3-TPD) was per-
formed on a XIANQUAN tp-5080 instrument (Tianjin, China)
using the standard procedure. The morphology of the sample
was investigated using a field-emission scanning electron
microscope (Hitachi FESEM 4800). The cross section of the
Co@HZSM-5 sample was prepared using an Ilion Precision
Cross-Section System (model 693, Gatan Inc., Pleasanton, CA,
USA). The sample was mixed with silver epoxy adhesive. One
cross section was milled with an argon ion beam using an
accelerating voltage of 4 kV for 2 h. The cross-sectional image
was obtained by a field-emission scanning electron microscope
(FEI, Quanta 400 FEG). 27Al MAS NMR spectroscopy was
conducted on a 300 MHz solid-state Bruker AV300
spectrometer (7.05 T), and the spectra were recorded at a
frequency of 78.2 MHz.
ACKNOWLEDGMENTS
■
This work was supported by the Chinese Academy of Sciences,
the National Natural Science Foundation of China (21133011
and 21373246), the Natural Science Foundation of Jiangsu
Province (BK20130354), and Jiangsu Planned Projects for
Postdoctoral Research Funds (1202066C).
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Tables S1 and S2 and Figures S1−S4. This material is available
AUTHOR INFORMATION
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Corresponding Author
Author Contributions
§P.S. and G.G. contributed equally.
Notes
The authors declare no competing financial interest.
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dx.doi.org/10.1021/cs501409s | ACS Catal. 2014, 4, 4136−4142