Abstract A propane combustion catalyst was prepared by supporting of Pd on optimized multiphase composition, containing Al2O3, La2O3 and CeO2 aiming for possible application in catalytic converters for abatement of propane in waste gases. The catalyst characterization has been made by N2- physisorption, XRD, SEM/EDX, TEM and XPS. The obtained values for reaction order towards propane and oxygen are 0.57 and 0.14, respectively. The negative reaction order towards the water vapour (−0.26) shows an inhibition effect of the water molecules. According to the kinetics model calculations, the reaction pathway over Pd-modified La–Ce catalyst proceeds most probably through Langmuir–Hinshelwood mechanism with adsorption of propane and oxygen on different types of sites, dissociative adsorption of oxygen, whereupon water molecules compete with propane molecules for one and the same type of adsorption sites. For practical evaluation of the synthesized material, a sample of Pd/Al2O3–La2O3–CeO2, supported on rolled Al-containing stainless steel (Aluchrom VDM®) to form a single monolithic channel was prepared and tested. Two-dimensional heterogeneous models were used to simulate the propane combustion from laboratory reactor to full-scale adiabatic monolithic converter for ensuring an effective abatement of propane emissions.

中文翻译：

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丙烷在 Pd 改性 Al-La-Ce 催化剂上的催化燃烧——从反应动力学和机理到整体反应器测试和放大

摘要 通过将钯负载在优化的多相组成上制备了一种丙烷燃烧催化剂，其中含有 Al2O3、La2O3 和 CeO2，旨在可能在催化转化器中应用以减少废气中的丙烷。通过 N2-物理吸附、XRD、SEM/EDX、TEM 和 XPS 对催化剂进行了表征。获得的丙烷和氧气的反应顺序值分别为 0.57 和 0.14。对水蒸气的负反应级数 (-0.26) 显示出对水分子的抑制作用。根据动力学模型计算，Pd 修饰的 La-Ce 催化剂的反应途径最有可能通过 Langmuir-Hinshelwood 机制进行，丙烷和氧在不同类型的位点吸附，氧的解离吸附，因此，水分子与丙烷分子竞争一种相同类型的吸附位点。为了对合成材料进行实际评估，制备并测试了 Pd/Al2O3–La2O3–CeO2 样品，该样品支撑在轧制的含铝不锈钢 (Aluchrom VDM®) 上以形成单个整体通道。二维非均相模型用于模拟从实验室反应器到全尺寸绝热整体式转化器的丙烷燃烧，以确保有效减少丙烷排放。