Sun Yinyong, Ma Shengqian, Du Yunchen, Yuan Lina, Wang Shichao, Yang Jun, Deng Feng, Xiao Feng-Shou
College of Chemistry & State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University, Changchun 130023, China.
J Phys Chem B. 2005 Feb 24;109(7):2567-72. doi: 10.1021/jp046335a.
Nanosized sulfated zirconia with Brønsted acidic sites has been prepared by a simple calcination in the absence of any solvent. XRD patterns reveal that the sulfated zirconia mainly consists of tetragonal crystalline zirconia with average size of about 7 nm, which is further confirmed by TEM images. N2 adsorption data show that the nanosized sulfated zirconia has high surface area (165-193 m2/g) and exhibits uniform pore distribution aggregated by zirconia nanoparticles. IR spectra of samples show that the sulfur species in the nanosized sulfated zirconia is a little different from that in conventional sulfated zirconia. Furthermore, IR spectra of adsorbed pyridine indicate that the nanosized sulfated zirconia contains relatively more Brønsted acidic sites than conventional sulfated zirconia. Catalytic tests show that the nanosized sulfated zirconia exhibits much higher activity than conventional sulfated zirconia in catalytic esterification of cyclohexanol with acetic acid.
通过在无任何溶剂的情况下进行简单煅烧制备了具有布朗斯特酸性位点的纳米硫酸化氧化锆。X射线衍射图谱表明，硫酸化氧化锆主要由平均尺寸约为7nm的四方晶型氧化锆组成，透射电子显微镜图像进一步证实了这一点。N₂吸附数据表明，纳米硫酸化氧化锆具有高比表面积（165 - 193 m²/g），并且呈现出由氧化锆纳米颗粒聚集而成的均匀孔分布。样品的红外光谱表明，纳米硫酸化氧化锆中的硫物种与传统硫酸化氧化锆中的略有不同。此外，吸附吡啶的红外光谱表明，纳米硫酸化氧化锆比传统硫酸化氧化锆含有相对更多的布朗斯特酸性位点。催化测试表明，在环己醇与乙酸的催化酯化反应中，纳米硫酸化氧化锆比传统硫酸化氧化锆表现出更高的活性。
