Performance of a RuCs/MgO Catalyst Coated on Additive Manufactured Support Structures Via Electrophoretic Deposition for Ammonia Synthesis

Linus Biffar, Anh Thi Pham,Walther Benzinger,Peter Pfeifer

CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION（2024）

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Abstract

This work investigates the electrophoretic deposition of a catalytic coating on so-called fluid guiding elements (FGE) with a ruthenium-based catalyst for use in ammonia synthesis reactors. FGE are additive manufactured metallic pipe inserts that have shown to enhance the heat transfer compared to empty pipes by dividing the fluid flow and alternately guiding the partial flows to the wall. Consequently, they could improve the performance of temperature sensitive structured catalytic systems. To be able to demonstrate the degree of process intensification, the required steps to enable the deposition of a reference catalyst for ammonia synthesis are developed. Further, the distribution of catalytically active compounds is characterized. The catalytic activity is assessed in a plug flow reactor under pressures up to 5MPa and compared against a fixed bed from the same batch. The expected activity from the reference catalyst is calculated by a kinetic rate expression. The coating process does not affect catalytic activity, but a steady deactivation and high sensitivity to feed gas impurities are observed. Possible mechanisms for the deactivation are examined and discussed.

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Key words

Ruthenium-based catalysts,Additive manufactured fluid guiding elements,Electrophoretic deposition,Ammonia synthesis

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【要点】：本文研究了通过电泳沉积技术在添加剂制造的支撑结构上涂覆RuCs/MgO催化剂，用于氨合成反应，提高了催化系统的热传递性能。

【方法】：采用电泳沉积技术将催化涂层涂覆在所谓的流体引导元件（FGE）上，这些元件是通过添加剂制造技术制成的金属管道插入物。

【实验】：在压力高达5 MPa的填充流反应器中对催化活性进行了评估，并与同一批次的固定床进行了比较。实验使用了电泳沉积法制备的催化剂，数据集名称未提及，结果表现为涂覆过程不影响催化活性，但观察到稳定失活和对原料气杂质的高敏感性。探讨了可能的失活机制并进行了讨论。