Catalytic oxidation of diesel particulates with base metal oxides

Voss, Ken; Lampert, Jordan; Farrauto, Robert J.; Rice, Gary W.; Punke, A.; Krohn, R.

doi:10.1016/s0167-2991(06)81454-0

Cited by 15 publications

(5 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The stringent emissions control regulations introduced by governments, for example, the Euro 6 fuel emission targets, provide set targets for nitrogen oxide (NOx), carbon monoxide (CO), hydrocarbons (HC) and particulate matter (PM). On the top of fuel emissions, the properties of lubricant oils can affect engine emissions in several ways, as the heavy hydrocarbons from the engine oil are a significant contributor to the soluble organic fraction (SOF) or organic carbon [1] which lead to particle number emissions [2]; these can be improved by modifying oil properties (composition) and better seal compatibility which, in term, lead to lower oil consumption. The interface between the piston-ring and cylinder-liner is also a major source of frictional losses (equivalent to up to 10-20% of the fuel used [3][4][5][6]) and wear that can lead to increased emissions, lubricant consumption and noise, and also to reduce the engine efficiency and its durability; these issues can be different for different lubricant properties, in particular, its viscosity, temperature and surface tension.…”

Section: Introductionmentioning

confidence: 99%

Effect of Viscosity and Speed on Oil Cavitation Development in a Single Piston-Ring Lubricant Assembly

et al. 2019

View full text Add to dashboard Cite

A high-speed camera has been used to produce unique time-resolved images of high quality to describe the dynamics of the lubricant flow and cavitation characteristics in a sliding optical liner over a fixed single piston-ring lubricant assembly for three lubricants with different viscosities to establish their impact on cavitation formation and development. The images were obtained at two cranking speeds (or liner sliding velocity) of 300 rpm (0–0.36 m/s) and 600 rpm (0–0.72 m/s), at a lubricant temperature of 70 °C and a supply lubricant rate of 0.05 L/min. A special MATLAB programme has been developed to analyse the cavitation characteristics quantitatively. The dynamic process of cavities initiation was demonstrated by time-resolved images from fern cavity formation to fissure cavities and then their development to the sheet and strings cavities at a liner sliding velocity of around 0.17 m/s. The results for both up- and down-stroke motions showed that the cavities reach their fully developed state downstream of the contact point when the liner velocity reaches its highest velocity and that they start to collapse around TDC and BDC when the liner comes to rest. Within the measured range, viscosity had a great influence on length of cavities so that a decrease in viscosity (from Lubricant A to C) caused a reduction in length of cavities of up to 35% for Lubricant C. On the other hand, an increase in speed, from 300 rpm to 600 rpm, have increased the number of string cavities and also increased the length of cavities due to thicker oil film thickness with the higher speed. Overall, the agreement between the processed data by MATLAB and visualisation measurements were good, but further thresholds refinement is required to improve the accuracy.

show abstract

Section: Introductionmentioning

confidence: 99%

Effect of Viscosity and Speed on Oil Cavitation Development in a Single Piston-Ring Lubricant Assembly

et al. 2019

View full text Add to dashboard Cite

show abstract

“…The catalytic activity for SOF combustion of prepared catalysts were tested using TG-DTA method [16,39]. Due to the fact that the diesel SOF is comprised primarily of lube with a small amount of unburned fuel [51], commercial lubricating oil was often used to simulate the diesel SOF catalytic combustion [16,39].…”

Section: Catalyst Evaluationmentioning

confidence: 99%

Synthesis of Sulfur-Resistant TiO2-CeO2 Composite and Its Catalytic Performance in the Oxidation of a Soluble Organic Fraction from Diesel Exhaust

et al. 2018

View full text Add to dashboard Cite

Sulfur poisoning is one of the most important factors deteriorating the purification efficiency of diesel exhaust after-treatment system, thus improving the sulfur resistibility of catalysts is imperative. Herein, ceria oxygen storage material was introduced into a sulfur-resistant titania by a co-precipitation method, and the sulfur resistibility and catalytic activity of prepared TiO 2 -CeO 2 composite in the oxidation of diesel soluble organic fraction (SOF) were studied. Catalytic performance testing results show that the CeO 2 modification significantly improves the catalytic SOF purification efficiency of TiO 2 -CeO 2 catalyst. SO 2 uptake and energy-dispersive X-ray (EDX) results suggest that the ceria doping does not debase the excellent sulfur resistibility of bare TiO 2 , the prepared TiO 2 -CeO 2 catalyst exhibits obviously better sulfur resistibility than the CeO 2 and commercial CeO 2 -ZrO 2 -Al 2 O 3 . X-ray powder diffraction (XRD) and Raman spectra indicate that cerium ions can enter into the TiO 2 lattice and not form complete CeO 2 crystals. X-ray photoelectron spectroscopy (XPS), H 2 -temperature programmed reduction (H 2 -TPR) and oxygen storage capacity (OSC) testing results imply that the addition of CeO 2 in TiO 2 -CeO 2 catalyst can significantly enhance the surface oxygen concentration and oxygen storage capacity of TiO 2 -CeO 2 .

show abstract

“…Diesel fuel is composed of linear hydrocarbons with chain lengths in the range C 10 eC 22 [21], which is advantageous in terms of the reaction activation due to the addition of hydrogen. Fig.…”

Section: Engine Testsmentioning

confidence: 99%

The effects of hydrogen on the efficiency of NO x reduction via hydrocarbon-selective catalytic reduction (HC-SCR) at low temperature using various reductants

Chun

2015

International Journal of Hydrogen Energy

View full text Add to dashboard Cite

Catalytic oxidation of diesel particulates with base metal oxides

Cited by 15 publications

References 1 publication

Effect of Viscosity and Speed on Oil Cavitation Development in a Single Piston-Ring Lubricant Assembly

Effect of Viscosity and Speed on Oil Cavitation Development in a Single Piston-Ring Lubricant Assembly

Synthesis of Sulfur-Resistant TiO2-CeO2 Composite and Its Catalytic Performance in the Oxidation of a Soluble Organic Fraction from Diesel Exhaust

The effects of hydrogen on the efficiency of NO x reduction via hydrocarbon-selective catalytic reduction (HC-SCR) at low temperature using various reductants

Contact Info

Product

Resources

About