Application for a Newly Developed High-Capacity NO_x Denuder: Low-NO_x Diesel Transformation Experiments

Figures & data

Table 1. Results from EUPHORE experiments with (May 30 and 31, 2006) and without denuder (May 26 and June 13, 2006) for DE injections

Experiment NOx Denuder Usage	Engine-Out NOx (ppm)	Injection Time (min)/Volume (L)	In-Chamber NOx (ppm)	In-Chamber DPM (μg m^−3)	Median Diameter (nm)	Mean Diameter (nm)	Injected DE Mass Concentrations (μg L^−3)
DE without denuder	430	6 (774) ^a	1.7	33	62	71	8.7 ^b
DE without denuder	410	10 (1290)	2.6	60	61	69	9.5
DE with denuder	390	20 (1000)	0.009	30	75	84	6.1
DE with denuder	415	27 (1350)	0.050	54	88	100	8.2
Notes:
^aValue in parentheses represents total injection volume using estimated flows of 129 (without) and 50 L/min (with);
^bCalculated using in-chamber DPM multiplied by total chamber volume (204.5 m^3) divided by injection volume.

Table 2. Percent difference values for NPAHs in μg (mgEC) ⁻¹

	Low NOx			High NOx
Compound/Group	May 30, 2006, D-1a	May 31, 2006, D-1b	Average with Denuder ^a	May 26, 2006, D-1c	June 13, 2006 D-1d	Average without Denuder ^b	Percent Difference ^c
1NN ^d	0.10	0.50	0.30 (±0.27)	1.72	1.68	1.70 (±0.02)	82
1NP ^e	0.11	0.02	0.07 (±0.06)	0.05	0.16	0.11 (±0.08)	38
NPAH (particle)	0.36	0.13	0.25 (±0.17)	0.65	0.28	0.46 (±0.26)	46
NPAH (gas)	0.11	0.40	0.26 (±0.20)	2.32	2.26	2.29 (±0.04)	88
Notes: “Particle” implies particle-phase totals, “gas” implies gas-phase totals.
^aValues with denuder are averaged for May 30 and 31, 2006;
^bValues without denuder are averaged for May 26 and June 13, 2006;
^cPercent difference =[(without denuder – with denuder)/without denuder]× 100;
^dGas + particle phase;
^eGas + particle phase.