Catalytic conversion of glycerol to value added liquid products

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• 作者：Kapil Pathak ; K. Mohan Reddy ; N.N. Bakhshi ; A.K. Dalai
• 关键词：Glycerol ; Acetaldehyde ; Acrolein ; Formaldehyde ; Acetol
• 刊名：Applied Catalysis A: General
• 出版年：2010
• 出版时间：15 January 2010
• 年：2010
• 卷：372
• 期：2
• 页码：224-238
• 全文大小：1097 K

文摘

Catalytic conversion of glycerol was performed for production of value-added liquid chemicals. In this work, a systematic study has been conducted to evaluate the effects of operating conditions such as glycerol conversion to liquid chemical products in the presence of acid catalysts. Experiments were performed in a fixed-bed reactor using HZSM-5, HY, silica-alumina and γ-alumina catalysts. The temperature, carrier gas flow rate and weight hourly space velocity (WHSV) were maintained in the range of 350–500 °C, 20–50 mL/min and 5.40–21.60 h⁻¹, respectively. The main liquid chemicals detected in liquid product were acetaldehyde, acrolein, formaldehyde and hydroxyacetone. Under all experimental conditions complete glycerol conversion was obtained over silica-alumina and γ-alumina. A maximum liquid product yield of approximately 83 g/100 g feed was obtained with these two catalysts when the operating conditions were maintained at 380 °C, 26 mL/min and 8.68 h⁻¹. Maximum glycerol conversions of 100 wt % and 78.8 wt % were obtained in the presence of HY and HZSM-5 at temperature, carrier gas flow rate and WHSV of 470 °C, 26 mL/min and 8.68 h⁻¹. HY and HZSM-5 produced maximum liquid product of 80.9 and 59.0 g/100 g feed at temperature of 425 and 470 °C, respectively. Silica-alumina produced the maximum acetaldehyde (24.5 g/100 g feed) whereas γ-alumina produced the maximum acrolein (25 g/100 g feed). Also, silica-alumina produced highest formaldehyde yield of 9 g/100 g feed whereas HY produced highest acetol yield of 14.7 g/100 g feed. The effect of pore size of these catalysts was studied on optimum glycerol conversion and liquid product yield.