Catalytic Oxidation of Aniline to Azoxybenzene Over CuCr2O4 Spinel Nanoparticle Catalyst
Catalytic Oxidation of Aniline to Azoxybenzene Over CuCr2O4 Spinel Nanoparticle Catalyst
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DOI：
10.1021/sc5000545
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发表时间：
2014-04-01
影响因子：
8.4
通讯作者：
Bal, Rajaram
中科院分区：
文献类型：
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作者：
Acharyya, Shankha S.;Ghosh, Shilpi;Bal, Rajaram
报道了阳离子表面活性剂十六烷基三甲基氯化铵水热法合成CuCr 2 O 4尖晶石纳米粒子。采用XRD、XPS、SEM、TEM、TGA和ICP-AES等手段对CuCr 2 O 4尖晶石纳米粒子催化剂进行了表征。表征结果表明，形成的CuCr 2 O 4尖晶石纳米粒子的尺寸在25和50 nm之间。结果表明，该催化剂能以H2 O2为氧化剂，选择性地将苯胺转化为氧化偶氮苯。研究了反应温度、H_2O_2与苯胺摩尔比、反应时间等因素对苯胺收率的影响。在70 ℃下，苯胺转化率为78%，氧化偶氮苯选择性为92%。该催化剂在重复使用5次后未出现任何浸出，表明了该催化剂的真实不均匀性。然而，在催化剂上发生显著的H2 O2分解，需要其以五倍过量使用。
Cationic surfactant cetyltrimethylammonium chloride-mediated hydrothermal preparation of CuCr2O4 spinel nanoparticles has been reported. This CuCr2O4 spinel nanoparticle catalyst has been characterized by XRD, XPS, SEM, TEM, TGA, and ICP-AES. Characterization results showed the formation of CuCr2O4 spinel nanoparticles with sizes between 25 and SO nm. It was found that the catalyst can selectively convert aniline to azoxybenzene with H2O2 as oxidant. The effect of different reaction parameters like reaction temperature, H2O2 to aniline molar ratio, reaction time, and so forth have been studied in detail. An aniline conversion of 78% with azoxybenzene selectivity of 92% can be achieved over this catalyst at 70 degrees C. The catalyst did not show any leaching up to five reuses, showing the true heterogeneity of the catalyst. However, significant H2O2 decomposition occurs on the catalyst necessitating its usage in five-fold excess.