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Citation: ZHANG Ye-Xin, SU Qing-Yun, WANG Zhong-Peng, GAO Xi-Yan, ZHANG Zhao-Liang. Surface Modification of Mg-Al Hydrotalcite Mixed Oxides with Potassium[J]. Acta Physico-Chimica Sinica, ;2010, 26(04): 921-926. doi: 10.3866/PKU.WHXB20100446 shu

Surface Modification of Mg-Al Hydrotalcite Mixed Oxides with Potassium

1.
Institute of Internal Combustion Engine, Dalian University of Technology, Dalian 116024, Liaoning Province, P. R. China; College of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, P. R. China

Received Date: 19 November 2009
Available Online: 17 March 2010

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 thatKwas highly dispersed on the surface of MgAlO when the loading amount was less than 8% (w). 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), the quasi free KOx 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.
- In situ IR,
- Hydrotalcite,
- Potassium,
- Surface modification,
- Basic site
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