A porous ceramic coating applied to catalyst substrates to support active catalytic materials in SCR systems.
A washcoat is a thin, porous ceramic layer applied to the surface of catalyst substrates (typically honeycomb monoliths) in Selective Catalytic Reduction (SCR) systems. It serves as a high-surface-area support structure for active catalytic materials (such as vanadium, tungsten, or zeolite-based compounds) that facilitate the reduction of nitrogen oxides (NOx) with ammonia or urea. The washcoat enhances catalytic activity, thermal stability, and poison resistance while maintaining low pressure drop across the system.
诱因 → 失效模式 → 工程缓解
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To provide a high-surface-area support for active catalytic materials, maximizing NOx conversion efficiency while ensuring mechanical and thermal stability.
Higher porosity increases surface area for catalytic reactions and reduces diffusion resistance, but must be balanced with mechanical strength to prevent washcoat detachment.
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