期刊
JOURNAL OF OLEO SCIENCE
卷 68, 期 7, 页码 679-687出版社
JAPAN OIL CHEMISTS SOC
DOI: 10.5650/jos.ess19035
关键词
Mg/Al hydrotalcite; oxidative dehydrogenation; ethanol; acetaldehyde; catalyst
资金
- Grant for International Research Integration: Chula Research Scholar, Ratchadaphiseksomphot Endowment Fund
- Grant for Research: Government Budget, Chulalongkorn University (2018)
Hydrotalcite or Mg-Al LDHs were synthesized by co-precipitation method. The Mg-Al mixed oxide was then derived by calcination of hydrotalcite at 450 degrees C. The metal modified catalysts (Mo/Mg-Al and V/Mg-Al) were prepared by incipient wetness impregnation method. The obtained catalysts were characterized by several useful techniques and tested the reactivity for dehydrogenation and oxidative dehydrogenation of ethanol (gas-phase) to produce acetaldehyde. The catalytic reactions were performed at temperature range from 200 to 400 degrees C for both non-oxidative and oxidative atmospheres. The results showed that the vanadium-modified hydrotalcite (V/Mg-Al) exhibited the highest ethanol conversion (34.3%) and acetaldehyde yield (15.5%) at 400 degrees C in the non-oxidative atmosphere. For the oxidative dehydrogenation of ethanol, the V/Mg-Al catalyst showed the highest activity at 400 degrees C giving the ethanol conversion and acetaldehyde yield of 73.7% and 29.5%, respectively. This result probably related to the highest base density of V/Mg-Al catalyst (6.13 mu mol CO2/m(2)) measured by CO2-TPD. The catalytic activity of Mg-Al catalyst and metal modified catalyst slightly decreased upon time-on-stream test for 10 h on oxidative dehydrogenation of ethanol due to carbon deposition.
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