期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 107, 期 1-2, 页码 177-187出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2011.07.011
关键词
Dehydration; Glycerol; Acrolein; Silica-alumina; Acidity
资金
- Priority Research Centers through the National Research Foundation of Korea (NRF)
- Ministry of Education, Science, and Technology [2010-0029617]
- Ministry of Knowledge Economy (MKE) of Korea [10033099]
- Korea Evaluation Institute of Industrial Technology (KEIT) [10033099] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Council of Science & Technology (NST), Republic of Korea [2E2214] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2009-0094046, 과C6A2404] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The gas-phase dehydration of glycerol was conducted over silica-alumina catalysts with different Si/Al molar ratios. For comparison, SiO2 and eta-Al2O3 were also examined. A variety of techniques. X-ray diffraction (XRD), temperature-programmed desorption of ammonia (NH3-TPD), temperature-programmed oxidation (TPO) with mass spectroscopy (MS), infrared spectroscopy (FT-IR) after the adsorption of pyridine or glycerol, solid-state Si-29 and Al-22 magic-angle spinning nuclear magnetic resonance (MAS/NMR) spectroscopy, Raman spectroscopy, and CHNS analysis, were employed to characterize the catalysts. The initial glycerol conversion at 315 degrees C was strongly dependent on the total amount of acid sites over the silica-aluminas. The acrolein yield was proportional to the concentration of the Bronsted acid sites, whereas the 1-hydroxyacetone yield was proportional to the concentration of the Lewis acid sites. Among the tested catalysts, Si0.8Al0.2Ox showed the highest acrolein selectivity during the initial 2 h of the reaction. As long as the molar ratio between water and glycerol was in the range 2-11, the acrolein selectivity increased significantly with the water content of the feed. (C) 2011 Elsevier B.V. All rights reserved.
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