Journal
ACTA PHYSICO-CHIMICA SINICA
Volume 26, Issue 4, Pages 921-926Publisher
PEKING UNIV PRESS
DOI: 10.3866/PKU.WHXB20100446
Keywords
In situ IR; Hydrotalcite; Potassium; Surface modification; Basic site
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Funding
- National High Technology Research and Development Program of China (863)
- National Natural Science Foundation of China [20777028]
- Natural Science Foundation of Shandong Province, China [2007ZRB01259]
- Doctor Foundation of Shandong Province, China [BS2009HZ010]
- [2008AA06Z320]
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The surface modification of Mg-Al hydrotalcite mixed oxides (MgAlO) with K was, investigated using X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), in situ infrared (in situ IR) spectroscopy, and temperature-programmed desorption of CO2 (CO2-TPD) We found that K was highly dispersed on the surface of MgAlO when the loading amount was less than 8% (omega) New Lewis base sites were formed through the interaction between K and MgAlO The weakly basic Mg(Al)-O-K resulted from the proton substitution of Mg(Al)-OH with K Mg-O-K was obtained by combination with strongly basic O2- sites At a K loading between 5% (w) and 8% (w), die quasi free KO, species that interacted weakly with the support and showed stronger basicity than Mg-O-K was formed The increase in basicity of K/MgAlO can be attributed to charge transfer from K to the surface oxygen anions, which increases the negative charge of the strongly basic sites
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