title: Technology innovations and experience curves for nitrogen oxides control technologies.
abstract: This paper reviews the regulatory history for nitrogen oxides (NOx) pollutant emissions from stationary sources, primarily in coal-fired power plants. Nitrogen dioxide (NO2) is one of the six criteria pollutants regulated by the 1970 Clean Air Act where National Ambient Air Quality Standards were established to protect public health and welfare. We use patent data to show that in the cases of Japan, Germany, and the United States, innovations in NOx control technologies did not occur until stringent government regulations were in place, thus "forcing" innovation. We also demonstrate that reductions in the capital and operation and maintenance (O&M) costs of new generations of high-efficiency NOx control technologies, selective catalytic reduction (SCR), are consistently associated with the increasing adoption of the control technology: the so-called learning-by-doing phenomena. The results show that as cumulative world coal-fired SCR capacity doubles, capital costs decline to approximately 86% and O&M costs to 58% of their original values. The observed changes in SCR technology reflect the impact of technological advance as well as other factors, such as market competition and economies of scale.
authors.affiliation: National Risk Management Research Laboratory, Office of Research and Development, U.S. Environmental Protection Agency, Research Triangle Park, NC 27711, USA. yeh.sonia@epa.gov
authors.forename: Sonia
authors.initials: S
authors.lastname: Yeh
authors.forename: Edward S
authors.initials: ES
authors.lastname: Rubin
authors.forename: Margaret R
authors.initials: MR
authors.lastname: Taylor
authors.forename: David A
authors.initials: DA
authors.lastname: Hounshell
mesh_terms: D000393:Air Pollutants / Q000592:standards; D000397:Air Pollution / Q000191:economics / Q000331:legislation & jurisprudence / Q000517:prevention & control*; D003031:Coal; D003365:Costs and Cost Analysis; D005060:Europe; D033161:Government Regulation; D007564:Japan; D009589:Nitrogen Oxides / Q000592:standards; D010330:Patents as Topic; D011210:Power Plants; D013672:Technology; D014481:United States; D018505:Waste Management / Q000191:economics / Q000379:methods
chemical_list: D000393:Air Pollutants; D003031:Coal; D009589:Nitrogen Oxides