Effects of water density on acid-catalytic properties of TiO2 and WO3/TiO2 in supercritical water |
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| Affiliation: | 1. Catalysis Division, Indian Institute of Chemical Technology, Hyderabad 500 007, India;2. School of Applied Sciences, RMIT University, GPO Box 2476V, Melbourne, VIC 3001, Australia;1. College of Food Science and Engineering, South China University of Technology, 381 Wushan Road, Guangzhou 510641, China;2. Guangdong Saskatchewan Oil seed Joint Laboratory, Department of Food Science and Engineering, Jinan University, Guangzhou 510632, China;3. Research School of Chemistry, The Australian National University, Canberra, ACT 2612, Australia;1. Institute for Energy Research, School of the Environment, Jiangsu University, Zhenjiang, 212013, PR China;2. School of Environmental and Chemical, Engineering, Jiangsu University of Science and Technology, Zhenjiang, 212003, PR China;3. Hainan Provincial Key Lab of Fine Chemistry, Hainan University, Haikou, Hainan, 570228, PR China;1. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Science, Taiyuan 030001, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. Dalian National Laboratory of Clean Energy, Dalian 116023, China;1. School of Environment, Northeast Normal University, Changchun 130117, People’s Republic of China;2. School of Chemistry, Northeast Normal University, Changchun 130024, People’s Republic of China |
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| Abstract: | The effects of water density on the acid-catalytic properties of TiO2 and WO3/TiO2 catalysts in supercritical water at 400 °C were investigated by using the kinetic analysis of the dehydration reaction of glycerol. The reaction selectivity of TiO2 and WO3/TiO2 catalysts and the apparent-reaction orders for water indicated that the acid-catalytic properties of these two catalysts show different dependence on water density. In the reaction using TiO2, the contribution of Lewis acid sites in TiO2 was large at a low water density, while the contribution of Brönsted acid sites in TiO2 increased with increasing water density. On the other hand, the reaction using WO3/TiO2 was mainly catalyzed by Brönsted acid sites in WO3/TiO2 even at a low water density, and the nature of Lewis/Brönsted acid sites in WO3/TiO2 was not influenced by the water density. |
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| Keywords: | Supercritical water Solid acid Water density Kinetics Glycerol dehydration |
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