Abstract

Catalysts based on manganese oxides, doped with Pt, and supported on ceramic monoliths with a honeycomb structure were produced by impregnation and solution combustion synthesis (SCS). In SCS, glycine was used as a fuel additive, ensuring different conditions of the combustion of depleted (φ < 1) and enriched (φ > 1) fuel mixtures. The catalysts were studied by TGA, XRD, HRTEM, TPR-H₂, BET, and differential dissolution. The catalytic properties of the samples were investigated in the deep oxidation of butane and methane. It was shown that, under SCS conditions, the active components form as a finely dispersed particles of metallic platinum and manganese oxides Mn₃O₄ in the near-surface layers of the support. Unlike this, after the thermal treatment of the impregnated catalyst, the formed manganese oxides are enriched with Mn(IV) cations and primarily localized in the bulk of the support, forming with it an interaction phase. The high activity of the SCS catalysts in the oxidation of butane and methane is manly determined by the presence of reduced forms of manganese oxide and the accessibility of the active components for the reactants in the near-surface layers of the support.

中文翻译：

---

溶液燃烧合成条件对Pt-MnO x整体催化深度氧化烃性能的影响

摘要

通过浸渍和固溶燃烧合成（SCS）生产基于锰氧化物的，掺杂有Pt并负载在具有蜂窝结构的陶瓷整料上的催化剂。在SCS中，甘氨酸用作燃料添加剂，可确保贫化（φ<1）和富集（φ> 1）混合燃料在不同的燃烧条件下燃烧。通过TGA，XRD，HRTEM，TPR-H ₂，BET和微分溶解对催化剂进行了研究。在丁烷和甲烷的深度氧化中研究了样品的催化性能。结果表明，在SCS条件下，活性成分形成为细分散的金属铂和锰氧化物Mn ₃ O ₄颗粒。在支撑物的近表层。与此不同的是，在对浸渍的催化剂进行热处理之后，所形成的锰氧化物富含Mn（IV）阳离子，并主要位于大部分载体中，并与之形成相互作用相。SCS催化剂在丁烷和甲烷氧化中的高活性是由还原形式的氧化锰的存在和活性成分对载体近表面层中反应物的可及性决定的。