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首页> 外文期刊>Applied Catalysis, A. General: An International Journal Devoted to Catalytic Science and Its Applications >Mesoporous Al-promoted sulfated zirconia as an efficient heterogeneous catalyst to synthesize isosorbide from sorbitol
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Mesoporous Al-promoted sulfated zirconia as an efficient heterogeneous catalyst to synthesize isosorbide from sorbitol

机译：中孔Al-促进的硫酸化氧化锆作为一种有效的异质催化剂，用于将异山梨醇合成来自山梨糖醇

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摘要

Mesoporous aluminum-promoted sulfated zirconia (named as mAl-SZ) was directly prepared by grind method, and firstly used to catalyze the solvent-free dehydration of sorbitol to isosorbide. The physicochemical properties of as-prepared catalysts were characterized by FT-IR, TGA, XRD, N2sorption, NH3-TPD and pyridine-infrared (IR) spectroscopy techniques in order to elucidate the relevance of the catalyst properties and the catalytic performance. It was found that the catalysts prepared by grind method possessed mesoporous structures with high surface area, pure tetragonal phase as well as high sulfur contents, which were advantage to eliminate diffusion limitation and generate abundant acidic sites, especially Br?nsted acidic sites. Furthermore, aluminum promoters could contribute to the considerable increase of the strong acidic sites and ratio of Br?nsted to Lewis acidic sites. Consequently, the mesoporous sulfated zirconia with 6?mol% Al-promoter (6Al-SZ) attained porous structure with improved acidic properties, thus showing the optimal catalytic behavior. The full sorbitol conversion with 73% isosorbide selectivity was achieved under milder conditions (175?°C, 2?h) than those of similar type of catalysts. In addition, the 6Al-SZ exhibited favorable reusability with insignificant drop in isosorbide yield during five reaction cycles.
机译：通过研磨方法直接制备介孔的铝促进的硫酸锆（命名为MAL-SZ），首先用于催化山梨糖醇对异山梨醇的无溶剂脱水。通过FT-IR，TGA，XRD，N 2，NH 3-TPD和吡啶 - 红外（IR）光谱技术以FT-IR，TGA，XRD，N 2进行了特征，以阐明催化剂性能的相关性和催化性能的表征的催化剂的物理化学性质。发现通过研磨方法制备的催化剂具有具有高表面积，纯四方相以及高硫含量的介孔结构，这是消除扩散限制并产生丰富的酸性位点的优势，特别是Br？nsted酸性位点。此外，铝促进剂可以有助于大幅增加强酸性位点和Br的比例。nsted到Lewis酸性位点。因此，具有6〜摩尔％的α-启动子（6AL-SZ）的中孔硫酸化氧化锆，其具有改进的酸性特性，因此呈现出最佳的催化性能。在比类似类型的催化剂类型中，实现具有73％异山梨醇选择性的全山梨糖醇转化率。此外，6AL-SZ在五次反应循环期间表现出具有良好的可重用性，在异山梨异常产量下降。

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