Role of Calcination Temperature on the Hydrotalcite Derived MgO–Al2O3 in Converting Ethanol to Butanol
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In the base catalyzed ethanol condensation reactions, the calcined MgO–Al2O3 derived hydrotalcites used broadly as catalytic material and the calcination temperature plays a big role in determining the catalytic activity. The characteristics of the hydrotalcite material treated between catalytically relevant temperatures 450 and 800 °C have been studied with respect to the physical, chemical, and structural properties and compared with catalytic activity testing. With the increasing calcination temperature, the total measured catalytic basicity dropped linearly with the calcination temperature and the total measured acidity stayed the same for all the calcination temperatures except 800 °C. However, the catalyst activity testing does not show any direct correlation between the measured catalytic basicity and the catalyst activity to the ethanol condensation reaction to form 1-butanol. The highest ethanol conversion of 44 % with 1-butanol selectivity of 50 % was achieved for the 600 °C calcined hydrotalcite material.
KeywordsEthanol condensation Guerbet Hydrotalcite Butanol Mixed oxide MgO–Al2O3
The Pacific Northwest National Laboratory is operated by the Battelle Memorial Institute for the U.S. Department of Energy under Contract No. DE-AC05-76RL01830. This work was supported by the U.S. Department of Energy’s Bioenergy Technology Office. The SEM imaging portion of the work was done as a part of chemical imaging initiative, a laboratory directed research and development program at Pacific Northwest National Laboratory. The SEM imaging was conducted in the William R. Wiley Environmental Molecular Sciences Laboratory (EMSL), a national scientific user facility sponsored by DOE’s Office of Biological and Environmental Research and located at PNNL. The authors wish to express thanks to Robert A. Dagle and Michael A. Lilga for the valuable technical discussions, Colin D. Smith for the XRD analysis, and Satish Nune for the TG analysis.
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