A New Feature of Metallic Foam Structured Catalyst Prepared by Slurry Coating for Selective Catalytic Reduction of Nitrogen Oxide with Ammonia

摘要

In this study, the metallic structured catalyst (MSC) for applying selective catalytic reduction with ammonia (NH3-SCR) was prepared using the metallic structure substrate by slurry coating to compensate the defects of ceramic honeycomb catalyst (CHC). The SEM images showed the homogeneous dispersion of catalyst particles deposited onto the surface of the metallic structure substrate, providing that the MSC was successfully synthesized. The results of NH3-TPD revealed that the as-prepared samples had two peaks assigning Bronsted acid sites for low-temperature region and Lewis acid sites for high-temperature region. In addition, the total amounts of acid sites for both as-prepared samples were similar values. This means that they are almost the same as the sum of active sites. In general terms, the active sites have an effect on the catalytic activity of NH3-SCR reaction. The NOx conversion of the as-prepared MSC was approximately equal to that of the commercial CHC under similar SCR conditions on ship (GHSV = 10,000 h(-1)). We first attempted to use metallic based SCR catalyst prepared by coating process to substitute an existing honeycomb catalyst. It is expected that the MSC showed its possibility as alternative catalyst for NH3-SCR reaction.