Evidences of the Cerium Oxide-Catalysed DPF Regeneration in a Real Diesel Engine Exhaust

The active phase Ce0.5Pr0.5O2 has been loaded on commercial substrates (SiC DPF and cordierite honeycomb monolith) to perform DPF regeneration experiments in the exhaust of a diesel engine. Also, a powder sample has been prepared to carry out soot combustion experiments at laboratory. Experiments performed in the real diesel exhaust demonstrated the catalytic activity of the Ce–Pr mixed oxide for the combustion of soot, lowering the DPF regeneration temperature with regard to a counterpart catalyst-free DPF. The temperature for active regeneration of the Ce0.5Pr0.5O2-containing DPF when the soot content is low is in the range of 500–550 °C. When the Ce0.5Pr0.5O2-containing DPF is saturated with a high amount of soot, pressure drop and soot load at the filter reach equilibrium at around 360 °C under steady state engine operation due to passive regeneration. The uncoated DPF reached this equilibrium at around 440 °C. Comparing results at real exhaust with those at laboratory allow concluding that the Ce0.5Pr0.5O2-catalysed soot combustion in the real exhaust is not based on the NO2-assisted mechanism but is most likely occurring by the active oxygen-based mechanism.

Occupational exposure to hydrogen cyanide and cyanide salts (NaCN,KCN,and Ca (CN)2).

Mode of access: Internet.

Molten salts : selected references /

"Included are 205 references to unclassified reports received by the Office of Technical Information Extension since mid-1958"--Page [1].

Molten salts : selected references /

Includes indexes.

Paper electrophoretic studies of radioactive chromium salts in blood /

"Published with the approval of the Director of the University of Tennessee Agricultural Experiment Station."--Page iii.

Investigation of salts for use in uranium metal heat-treating baths /

Numerous salts were considered for uranium metal annealing baths. Tests on melting point, solubility, corrosion stability, and hydrogen concentration were conducted on the salts which appeared to be the most feasible for this operation under existing conditions.

Corrosion of superalloys by selected fused salts

Mode of access: Internet.

On the determination of nitric acid as nitric oxide : by means of its reaction with ferrous salts.

Reprinted from th Journal of the chemical society, July 1880.

An electrical method of determining the soluble salt content of soils : with some results of investigations on the effect of water and soluble salts on the electrical resistance of soils /

Mode of access: Internet.

Carbonisation of seaweed as a preliminary to the extraction of iodine and potassium salts,

Mode of access: Internet.

A catalytic decomposition of certain phenol silver salts.

Mode of access: Internet.