Abstract Volatile organic compounds, as an emerging group of organic pollutants, have significant harmful effects on both human health and the environment. BTX, which consists of benzene, toluene and xylene, is the most important kind of these compounds, which is extensively produced in the oil and gas industry. To date, various treatment methods have been used to remove volatile organic compounds. Among them, the non-thermal plasma technology has attracted more attention as an efficient technology for the removal of VOC compounds due to its numerous advantages. perovskite-type metal oxides have recently been found to be effective catalysts for the total oxidation of VOCs. This research has been conducted in two steps. In the first step, a series of La0.8A0.2MnO3 (A: Co, Zn, Mg, Ba) nano-catalysts were synthesized by sol-gel method and then their catalytic activity for removal of BTX compounds were investigated in a non-thermal hybrid plasma system with the dielectric reactor, among which La0.8Zn0.2MnO3 was the most active catalyst. In the next step, further studies focused on zinc doped perovskite nanocatalysts. The catalytic activity of La1-xZnxMnO3 (x = 0.1, 0.2, 0.3, 0.4, 0.5, 0.6) nanocatalysts was investigated where La0.8Zn0.2MnO3 catalyst showed highest removal efficiency by degradation 89.73% of benzene, 88.98% of toluene and 88.66% of xylene. It should be noted that product analysis was performed using GC analyzer. The effect of operating parameters such as plasma voltage, activation time, the amount of catalyst loading on optimal sample catalyst and air flow rate were further evaluated. The results exhibited that increasing plasma voltage, activation time and the amount of catalyst loading and PDC use will develop degradation percentage, reduce air flow rate and increase the process time. The physical and chemical properties of perovskite nanocatalysts were evaluated using XRD, SEM, EDX, FTIR, DRS, BET, TEM and SAED analyses. The XRD results suggested that all the samples demonstrated a typical pure perovskite phase. SEM analysis results confirm the formation of nanostructured catalysts and EDX analysis exhibited a good dispersion of elements in optimal photocatalyst. The FTIR results showed that all the characteristic absorption peaks of perovskite were present in synthesized samples. The EDX analysis exhibited a good dispersion of elements in optimal photocatalyst and the BET analysis also revealed that the optimal catalyst had higher specific surface area. Topography and morphology was determined by TEM analysis and the SAED results showed the catalyst structure. The reaction rate equations were also calculated.

中文翻译：

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在三元钙钛矿型 La1-x(Co, Zn, Mg, Ba)xMnO3 纳米催化剂上等离子体催化降解 BTX

摘要 挥发性有机化合物作为一类新兴的有机污染物，对人类健康和环境都有着显着的危害。BTX由苯、甲苯和二甲苯组成，是这些化合物中最重要的一种，在石油和天然气工业中广泛生产。迄今为止，已使用各种处理方法来去除挥发性有机化合物。其中，非热等离子体技术作为一种去除VOC化合物的高效技术，因其众多优点而备受关注。最近发现钙钛矿型金属氧化物是 VOC 完全氧化的有效催化剂。本研究分两步进行。第一步，一系列的 La0.8A0.2MnO3（A：Co、Zn、Mg、Ba)采用溶胶-凝胶法合成纳米催化剂，然后在具有介电反应器的非热混合等离子体系统中研究其去除BTX化合物的催化活性，其中La0.8Zn0.2MnO3是活性最高的催化剂。在下一步中，进一步的研究集中在锌掺杂的钙钛矿纳米催化剂上。研究了 La1-xZnxMnO3 (x = 0.1, 0.2, 0.3, 0.4, 0.5, 0.6) 纳米催化剂的催化活性，其中 La0.8Zn0.2MnO3 催化剂通过降解 89.73% 的苯、88.98%.66% 和 88% 的苯表现出最高的去除效率二甲苯。应该注意的是，产品分析是使用 GC 分析仪进行的。进一步评估了操作参数如等离子体电压、活化时间、催化剂负载量对最佳样品催化剂和空气流速的影响。结果表明，增加等离子体电压、活化时间和催化剂负载量和 PDC 使用量会增加降解百分比，降低空气流速并增加处理时间。使用 XRD、SEM、EDX、FTIR、DRS、BET、TEM 和 SAED 分析评估钙钛矿纳米催化剂的物理和化学性质。XRD 结果表明所有样品均表现出典型的纯钙钛矿相。SEM 分析结果证实了纳米结构催化剂的形成，EDX 分析表明元素在最佳光催化剂中具有良好的分散性。FTIR 结果表明钙钛矿的所有特征吸收峰都存在于合成样品中。EDX 分析显示出最佳光催化剂中元素的良好分散，BET 分析还表明最佳催化剂具有更高的比表面积。形貌和形态通过 TEM 分析确定，SAED 结果显示催化剂结构。还计算了反应速率方程。