In-Duct Selective Catalytic Reduction of NOxEPA Contract Number: 68D30133
Title: In-Duct Selective Catalytic Reduction of NOx
Investigators: Kittrell, J. R.
Small Business: KSE Inc.
EPA Contact: Manager, SBIR Program
Project Period: September 1, 1993 through March 1, 1994
Project Amount: $49,975
RFA: Small Business Innovation Research (SBIR) - Phase I (1993) RFA Text | Recipients Lists
Research Category: Air Quality and Air Toxics , SBIR - Air Pollution , Small Business Innovation Research (SBIR)
Description:The conventional control device of NOx emissions from stationary sources at 90% removal efficiency is the Selective Catalytic Reduction (SCR) system. Conventional SCR systems rely on monolithic catalysts; these catalysts often represent nearly one- half the capital investment. In recent years, European regulations have prompted development of in-duct dust injection control processes for certain gaseous emissions. These in-duct systems have been demonstrated to provide lower capital and operating costs than alternative systems.
In the Phase I research, the technical feasibility is to be demonstrated of an in-duct SCR control process for NOx control from gas-fired stationary sources. From preliminary laboratory experiments, this in-duct SCR technology appears able to utilize highly active, small particle SCR catalysts to achieve remarkable reactor productivity, with space velocities of approximately 1,000,000 hr-1. The process reduces internal catalyst diffusion limitations, thereby capturing the inherent catalyst activity. The in-duct SCR technology holds promise of approaching the low life- cycle costs of NOx control through non-catalytic urea injection, while achieving the high NOx removal efficiencies of conventional catalytic SCR systems. Ammonia slip may also be more effectively controlled.