Direct conversion of biomass components to the biofuel methyl levulinate catalyzed by acid-base bifunctional zirconia-zeolites
Direct conversion of biomass components to the biofuel methyl levulinate catalyzed by acid-base bifunctional zirconia-zeolites
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DOI：
10.1016/j.apcatb.2016.07.007
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发表时间：
2017-01-01
影响因子：
22.1
通讯作者：
Yang, Song
中科院分区：
文献类型：
--
作者：
Li, Hu;Fang, Zhen;Yang, Song
采用浸渍法和沉积-沉淀法制备了一系列金属-沸石杂化材料，并对其进行了表征。研究了这些催化剂在微波辅助下甲醇中将选定的碳水化合物转化为燃料组分乙酰丙酸甲酯（ML）的催化性能。结果表明，金属氧化物含量/类型和酸碱双官能度分别与底物转化率和ML产率密切相关。在所制备的各种催化剂中，具有中等酸碱中心含量（0.97 ~ 0.08 mmol g（-1））、高稳定性和高孔隙率（平均中孔直径6.2 nm）的ZrY 6（0.5）表现出较好的上级催化活性。在180 ° C下，可以从单糖（例如，葡萄糖、甘露糖和半乳糖）、蔗糖、淀粉和纤维素。Zr-Y_6（0.5）杂化物具有良好的稳定性，可重复使用5次，以葡萄糖为原料的ML产率>= 63%。(C)2016爱思唯尔B. V.保留所有权利。
A series of metal-zeolite hybrids was prepared by impregnation and deposition-precipitation methods and charaterized with different techniques. Catalytic performance of these catalysts on microwave assisted conversion of selected carbohydrates to the fuel component methyl levulinate (ML) in methanol was studied. It was demonstrated that metal oxide content/type and acid-base bifunctionality were closely correlated with substrate conversion and ML yield, respectively. Among various as-prepared catalysts, zirconia-zeolite hybrid ZrY6(0.5) with moderate acid-base site content (0.97 & 0.08 mmol g(-1)), high stability and porosity (average mesopore diameter: 6.2 nm) exhibited superior catalytic activity. At 180 degrees C, around 67-73%, 78%, 53% and 27% yields of ML could be achieved from monosaccharides (e.g., glucose, mannose and galactose), sucrose, starch and cellulose, respectively. The Zr-Y6(0.5) hybrid exhibited good stability, and could be reused for five times with ML yields of >= 63% from glucose. (C) 2016 Elsevier B.V. All rights reserved.