Acidic catalysts for the dehydration of glycerol: Activity and deactivation
Acidic catalysts for the dehydration of glycerol: Activity and deactivation
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DOI：
10.1016/j.molcata.2009.04.017
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发表时间：
2009-08
影响因子：
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通讯作者：
W. Suprun;Michal Lutecki;T. Haber;H. Papp
中科院分区：
文献类型：
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作者：
W. Suprun;Michal Lutecki;T. Haber;H. Papp
采用PO 4-离子浸渍法对Al 2 O3和TiO 2载体进行改性，制备了SAPO-11和SAPO-34样品，并对其进行了表征。用氨程序升温脱附法测定了催化剂的酸性。在280°C下研究了甘油在水存在下的气相脱水。甘油转化率和丙烯醛选择性取决于总酸度和质地性质。此外，在甘油脱水和1-羟基丙酮和3-羟基丙醛催化剂的转化过程中的副产物的形成进行了研究。SAPO样品在低反应时间下显示出高选择性。对于所有测试的催化剂，观察到快速失活和碳质沉积物的形成。采用TPD-NH3和TPO分析对失活催化剂的性能进行了研究。
Al2O3and TiO2supports modified by impregnation with PO4-ions and SAPO-11 and SAPO-34 samples were synthesized and characterized by physico-chemical methods. The acidic properties of these catalysts were determined by ammonia TPD. The gas-phase dehydration of glycerol in presence of water was investigated at 280°C. Glycerol conversion and acrolein selectivity depended on the total acidity and on the textural properties. Additionally, the formation of by-products during the dehydration of glycerol and the conversion of 1-hydroxyacetone and 3-hydroxypropionaldehyde catalysts was studied. The SAPO samples showed high selectivity at low reaction times. Rapid deactivation and formation of carbonaceous deposits was observed for all tested catalysts. The properties of the deactivated catalysts were studied by TPD-NH3and TPO analysis.