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Title:

Evaluation of Secondary Aerosol Formation from Primary Amines and Implications for Selective Catalytic Reduction Units

Accession Number:

01152387

Record Type:

Component

Availability:

Transportation Research Board Business Office

500 Fifth Street, NW
Washington, DC 20001 United States

Abstract:

With the mandated reduction of NOx from heavy-duty trucks, advanced emission control technologies are being implemented in order to comply with these lower standards. One of these strategies is the adaptation of selective catalytic reduction (SCR) units. These units are modified in various ways, with use of new reductants being among them. Currently the focus has been on use of urea due to its many advantages. Urea however suffers from several issues itself including its stability at elevated temperatures (>50°C) and its tendency to form deposits in the exhaust gas stream. Therefore, the use of compounds with amine functional groups has been proposed as reductants. Amines, such as methylamine (CH3-NH2), have a distinct advantage as they can thermally degrade to form ammonia, thereby eliminating the need for expensive catalysts in SCR units. However, during periods where the exhaust gas is insufficiently heated, complete conversion to ammonia not achieved and excess amine reductant will be emitted with the exhaust gas. Here we present a series of experiments focusing on the fate of four common primary amines in atmospheric conditions with the nitrate radical. This system shows potential for significant particle formation as evidenced by our previous work (1). It is found that ultrafine particles are formed with mass based yields ranging from <2% for methylamine to greater than 44% for butyl and ethylamine. Lower bounds for rate constants range from 1.39x10-16 cm3/molec/sec for methylamine to 7.75x10-17 cm3/molec/sec for ethylamine, indicating that these reactions are competitive with acid-base reactions.

Monograph Accession #:

01147878

Report/Paper Numbers:

10-1697

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Malloy, Quentin
Qi, Li
Warren, Bethany
Cocker III, David
Erupe, Mark
Silva, Philip

Pagination:

17p

Publication Date:

2010

Conference:

Transportation Research Board 89th Annual Meeting

Location: Washington DC, United States
Date: 2010-1-10 to 2010-1-14
Sponsors: Transportation Research Board

Media Type:

DVD

Features:

Figures (10) ; References (25)

Subject Areas:

Environment; Highways; Vehicles and Equipment; I96: Vehicle Operating Costs

Source Data:

Transportation Research Board Annual Meeting 2010 Paper #10-1697

Files:

TRIS, TRB

Created Date:

Jan 25 2010 10:46AM