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Citation: HUANG Deng-Tong, KE Guo-Liang, SU Shu, YANG Le-Fu, FANG Wei-Ping. Internal Standard Quantitative Characterization of Basic Sites on Mg-Al Hydrotalcites by CO₂-TPD-MS Technique[J]. Chinese Journal of Applied Chemistry, ;2010, 27(3): 338-341. doi: 10.3724/SP.J.1095.2010.90242 shu

Internal Standard Quantitative Characterization of Basic Sites on Mg-Al Hydrotalcites by CO₂-TPD-MS Technique

State Engineering Laboratory for Green Chemical Productions of Alcohols, Ethers and Esters, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005

Received Date: 7 April 2009
Revised Date: 6 July 2009

A series of hydrotalcite samples with varied Mg/Al ratios were synthesized by coprecipitation route.Quantitative analysis on the basic sites of hydrotalcite samples was carried out by CO₂-TPD(temperature programmed desorption) technique which was calibrated by calcium carbonate internal standard,and the effects of various experimental factors on the precision of testing results were evaluated.The relative standard deviation(RSD) of the experiments shows that the precision of test is obviously improved under the condition that the internal standard calibration is applied.Moreover,combined with the internal standard quantitative CO₂-TPD-MS technique,the investigation on the catalytic performance of hydrotalcites in transesterification demonstrates that the solid base with the stronger alkalinity and the higher density of basic sites presents the higher catalytic activity.
- solid base,
- CO₂-TPD,
- hydrotalcite,
- density of basic sites,
- transesterification
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Internal Standard Quantitative Characterization of Basic Sites on Mg-Al Hydrotalcites by CO2-TPD-MS Technique

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Internal Standard Quantitative Characterization of Basic Sites on Mg-Al Hydrotalcites by CO₂-TPD-MS Technique