Alumina supported mono and bimetallic Co and Fe catalysts, with different metal loading and different Co/Fe ratio, were used for decomposition reaction of ammonia to produce COx-free hydrogen in the microwave reactor system by mixing with mesoporous carbon. The structural and surface properties of the catalysts before and after being exposed to microwave radiation at the catalytic bed were examined by different techniques. Catalysts exhibited high catalytic performance in the microwave system, such that total conversion was achieved at 400 °C under the flow of ammonia (GHSV of 36,000 ml/g_cat.h), while they showed negligible activity in the conventionally heated reactor system. Microwave exposure causes the formation of cobalt carbide and iron carbide in the structure of monometallic cobalt and monometallic iron catalysts, respectively. Moreover a phase transition from γ-alumina to$\alpha$ -alumina was recognized for both of them. Long term exposure to microwave further enhance the carbide formation that could be effective getting stable conversion values in time on stream experiments. While, alumina supported monometallic cobalt catalysts gave better yield than alumina supported monometallic iron catalysts in both of the systems, bimetallic catalysts showed better activity than monometallic catalysts, especially at temperatures lower than 400 °C.

氧化铝负载的单金属和双金属Co和Fe催化剂具有不同的金属负载量和不同的Co / Fe比，用于在微波反应器系统中与中孔碳混合，使氨分解反应生成无COx的氢。通过不同的技术检查了在催化剂床暴露于微波辐射之前和之后的催化剂的结构和表面性质。催化剂在微波系统中表现出较高的催化性能，因此在氨流（GHSV为36,000 ml / g _cat.h），尽管它们在常规加热的反应器系统中的活性可忽略不计。微波辐射分别在单金属钴和单金属铁催化剂的结构中形成碳化钴和碳化铁。而且从γ-氧化铝到$\alpha$-氧化铝被认可为他们两个。长期暴露于微波可进一步增强碳化物的形成，这可以有效地在流实验中及时获得稳定的转化值。尽管在两种体系中，氧化铝负载的单金属钴催化剂均比氧化铝负载的单金属铁催化剂具有更好的产率，但双金属催化剂显示出比单金属催化剂更好的活性，特别是在低于400℃的温度下。