FeOx/Al2O3 catalysts for high-temperature decomposition of N2O under conditions of NH3 oxidation in nitric acid production†,Catalysis Science & Technology

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FeOx/Al2O3 catalysts for high-temperature decomposition of N2O under conditions of NH3 oxidation in nitric acid production†
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2018-04-18 00:00:00 , DOI: 10.1039/c8cy00383a
Galina Sádovská _{1,

2,

3,

4,

5} , Edyta Tabor _{1,

2,

3} , Milan Bernauer _{1,

2,

3} , Petr Sazama _{1,

2,

3} , Vlastimil Fíla _{3,

5,

6,

7} , Tomáš Kmječ _{3,

8,

9,

10,

11} , Jaroslav Kohout _{3,

8,

9,

10,

11} , Karel Závěta _{3,

8,

9,

10,

11} , Věnceslava Tokarová _{3,

12,

13} , Zdeněk Sobalík _{1,

2,

3}

Affiliation

The catalytic activity of a series of FeO_x/Al₂O₃ prepared under various conditions was evaluated for high temperature decomposition of N₂O (HT-deN₂O) in a complex gas mixture produced by oxidation of ammonia. Thus the relevant step in the industrial nitric acid production process was simulated. The catalyst stability during long-term exposure (12 days) to reaction conditions relevant to HT-deN₂O was studied. Both fresh and aged FeO_x/Al₂O₃ exhibited more than 90% conversion of N₂O in the 750–900 °C temperature range. Structural analysis showed that the prepared FeO_x/Al₂O₃ catalysts contained various proportions of δ, θ and α alumina phases and up to four individual iron species. In the δ and θ Al₂O₃ phases, well stabilized Fe(III) in T_d or O_h coordination was identified as the active species in HT-deN₂O.

中文翻译：

用于硝酸生产中NH ₃氧化条件下N ₂ O高温分解的 FeO _x / Al ₂ O ₃催化剂†

评估了在各种条件下制备的一系列FeO _x / Al ₂ O ₃的催化活性，用于在氨氧化产生的复杂气体混合物中N ₂ O（HT-deN ₂ O）的高温分解。因此，模拟了工业硝酸生产过程中的相关步骤。研究了长期暴露于与HT-deN ₂ O有关的反应条件下（12天）的催化剂稳定性。在750-900°C的温度范围内，新鲜和老化的FeO _x / Al ₂ O _3均表现出90％以上的N ₂ O转化率。结构分析表明，所制备的FeO _x/ Al ₂ O ₃催化剂包含各种比例的δ，θ和α氧化铝相以及多达四个单独的铁物种。在δ和θAl ₂ O ₃相中，在T _d或O _h配位中稳定的Fe（III）被确定为HT-deN ₂ O中的活性物质。

更新日期：2018-04-18

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