Abstract

Сerium(IV) oxide, copper(II) oxide and their composite (CeO₂/CuO) were successfully synthesized via a simple method—solution combustion synthesis (SCS). The obtained samples were tested as a catalyst for the conversion of n-hexane, which could become the first step to further the synthesis of new simple catalysts constituted from oxide or composite in order to replace traditional ones and maintain a steady level of activity, which is urgently needed in petroleum refineries. The characteristics of the synthesized catalysts were achieved by various methods based on the analysis of TG/DSC, XRD, SEM, N₂ adsorption−desorption and determination of acid−base centers. Through analysis of thermochemical aspects revealed that the SCS process can be divided into 3 stages: evaporation of water to form a viscous mixture, combustion complex compounds and removal of residual substances. The ignition temperature touched 205, 226, and 233°C for the synthesis of CeO₂/CuO, CeO₂, and CuO catalysts, respectively. The combustion mode took place at different rates, therein the synthesis of composite combusted earlier and weaker than its oxides. Here, the relationship between particle size, morphology, surface area, and catalytic activity is also discussed. It was shown that among catalysts mentioned above, the CeO₂ sample exhibited the highest activity in the isomerization reactions of n-hexane conversion (68.7%), which was explained by the highest specific surface area (85.8 m²/g), and concentration of Lewis base centers (276.1 µmol/g). These findings are worth considering because of some of its advantages compared to commercial catalysts.

中文翻译：

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SCS方法制备CeO 2 / CuO纳米复合材料的研究：热化学方面和正己烷转化中的催化活性

摘要

氧化er（IV），氧化铜（II）及其复合物（CeO ₂ / CuO）是通过一种简单的方法成功地合成的-固溶燃烧合成（SCS）。将得到的样品进行试验作为用于转化的催化剂Ñ正己烷，这有可能成为第一个步骤，以进一步的从氧化物或复合构成新的简单的催化剂合成，以取代传统的那些和保持活性的一个稳定的水平，这炼油厂迫切需要。通过对TG / DSC，XRD，SEM，N ₂的分析，采用各种方法获得了合成催化剂的特性。吸附-解吸和酸碱中心的测定。通过热化学方面的分析表明，SCS过程可分为3个阶段：蒸发水以形成粘稠的混合物，燃烧复合物以及去除残留物质。合成CeO ₂ / CuO，CeO ₂和CuO催化剂的着火温度分别达到205、226和233°C 。燃烧模式以不同的速率发生，其中合成物的合成比其氧化物燃烧更早且更弱。在此，还讨论了粒径，形态，表面积和催化活性之间的关系。结果表明，在上述催化剂中，CeO ₂样品表现出最高的活性的异构化反应Ñ正己烷转化率（68.7％），这是由最高比表面积（85.8米说明² / g），以及路易斯碱中心的浓度（276.1微摩尔/克）。这些发现值得考虑，因为与商业催化剂相比，它具有某些优势。