In-Soo Ryu

Understanding the Effect of NO Adsorption on Potassium-Promoted Co 3 O 4 for N 2 O Decomposition

Co3O4 and K/Co3O4 were tested in catalytic N2O decomposition. K/Co3O4 exhibited higher activity than Co3O4, which was drastically and irrecoverably decreased with added NO. Studies revealed that the Co2+ valence state changed after NO adsorption, and that potassium strengthened the Co–NO bond, impeding NO desorption, even above 400 °C.Graphical Abstract

Catalytic Microchannels Stacked by Brazing Method

Abstract Each stack of microstructured stainless steel and aluminum plates was coated and brazed in vacuum. As a supporter of the catalyst, the coating layer was formed by the sol-gel method and anodizing, respectively. Though the number of brazed plates extended to one hundred, the thickness of the coating layer on the coated plate was relatively uniform, and the leakage of assembly was effectively minimized. The critical variables for brazing were both the thickness and shape of filler metal. Consequently, the brazing method had a good resolution for 200μ m, three-dimensional, multilayer structures. Through these results, coating to support catalysts in highly stacked layers by brazing can be applied to microcatalytic heat exchangers where the reaction and heat transfer occur simultaneously.

Catalytic Micro Channels Stacked by Brazing Method

Each stack of microstructured stainless steel and aluminum plates was coated and brazed in vacuum. As a supporter of catalyst, the coating layer was formed by solgel method and anodizing respectively. Though the number of brazed plates extended to a hundred, the thickness of coating layer on the respectively coated plate was relatively uniform and the leakage of assembly was effectively minimized. The critical variables for brazing were both thickness and shape of filler metal. Consequently, brazing method had good resolution for 200μm three dimensional multi layer structures. Through these results, coating to support catalysts in highly stacked layers by brazing can be applied to micro catalytic heat exchanger where the reaction and heat transfer occur simultaneously.Copyright