In the era of sustainable chemistry the development of nanocatalysis has drawn special attention. Here we report the preparation of nanocrystalline, mesoporous cerium-tin oxide solid solutions and tested for selective oxidation of benzyl alcohol, cinnamyl alcohol, 4-methylbenzyl alcohol, 2-octanol, and geraniol using molecular oxygen as an oxidant. Among different mesoporous supports with Ce/Sn compositions (98/2, 95/5, 90/10 and 80/20, the highest activity was found for the Ce-Sn mixed oxide (Ce/Sn = 95/5) supported gold nanoparticles. The microkinetic study shows that there was no mass transfer limitation in three phase catalytic system. The supports and the corresponding gold catalysts were extensively characterized by N₂ physisorption, XRD, H₂-TPR, NH₃-TPD, TEM, XPS, RAMAN and XAFS techniques. The nanocrystalline solid solution of Ce_xSn_1-xO₂ was detected by XRD analysis. The presence of oxide vacancy was confirmed by XPS and RAMAN studies. The reducibility of Ce-Sn mixed oxide support increased upon gold deposition which was confirmed by H₂-TPR techniques. The TPD study indicates the alteration of acid-basic sites of the CeO₂ oxide upon incorporation of tin and gold nanoparticles. The cooperative role between the gold species and the ceria-tin support has been observed while correlating the catalytic activity results with the characterization studies.

中文翻译：

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介孔铈锡复合氧化物上的金纳米颗粒有氧氧化苯甲醇

在可持续化学时代，纳米催化的发展引起了人们的特别关注。在这里，我们报告了纳米晶，介孔铈锡氧化物固溶体的制备，并测试了使用分子氧作为氧化剂对苯甲醇，肉桂醇，4-甲基苯甲醇，2-辛醇和香叶醇的选择性氧化。在具有Ce / Sn组成（98 / 2、95 / 5、90 / 10和80/20）的不同介孔载体中，发现Ce-Sn混合氧化物（Ce / Sn = 95/5）负载的金纳米颗粒的活性最高微动力学研究表明，三相催化体系没有传质限制，载体和相应的金催化剂具有N ₂物理吸附，XRD，H ₂ -TPR，NH ₃广泛表征。-TPD，TEM，XPS，RAMAN和XAFS技术。通过XRD分析来检测Ce _x Sn _1-x O ₂的纳米晶固溶体。XPS和RAMAN研究证实了氧化物空位的存在。Ce-Sn混合氧化物载体的还原性随着金的沉积而增加，这通过H ₂ -TPR技术得到了证实。TPD研究表明，在掺入锡和金纳米颗粒后，CeO ₂氧化物的酸碱性位点发生了变化。在将催化活性结果与表征研究联系起来的同时，还观察到了金和铈-锡载体之间的协同作用。