In-Duct Selective Catalytic Reduction of NOx

EPA Contract Number: 68D30133
Title: In-Duct Selective Catalytic Reduction of NOx
Investigators: Kittrell, J. R.
Small Business: KSE Inc.
EPA Contact: Manager, SBIR Program
Phase: I
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)


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.

Supplemental Keywords:

Scientific Discipline, Air, Toxics, Sustainable Industry/Business, air toxics, cleaner production/pollution prevention, Chemistry, HAPS, VOCs, Technology for Sustainable Environment, New/Innovative technologies, Engineering, Engineering, Chemistry, & Physics, Nitrogen Oxides, Nox, stationary sources, life cycle analysis, air pollutants, catalyst composition, control, selective catalytic reduction, emission control technologies, nitrogren oxides (NOx), pollution control technologies, air pollution control, air pollution, catalysts, emissions, treatment, life cycle assessment, catalytic combustion, nitrogen oxides (Nox), Volatile Organic Compounds (VOCs), air emissions, pollution prevention, removal, selective catalytic reduction (SCR)

Progress and Final Reports:

  • Final