Effects of the Extent of Silica Doping and the Mesopore Size of an Alumina Support on Activity as a Diesel Oxidation Catalyst

In this contribution, we present an industrial example on how tailored operando spectroscopic methodologies provide the insights needed for the development of new catalytic technologies and support their global utilization. We describe the use of operando spectroscopic methods to investigate how the CO oxidation performance of catalysts is impacted by NOx, H2, temperature, and moisture, as well as the catalyst support. This operando spectroscopic analysis provides mechanistic insights into the current diesel oxidation catalyst (DOC) system and shines light on the material and process development efforts on future DOC catalysts for low-temperature emission control to meet the new regulations. This investigation has shown that at cold-start temperatures, the nitrate growth can occupy the precious metal–alumina support interfacial sites that are critical for O2 dissociation and/or oxygen transfer and hinder CO conversion. Introduction of hydrogen on the catalyst surface can inhibit the nitrate growth, which in turn keeps these critical interfacial sites open.

Download Full-text

The effect of biodiesel on activity of diesel oxidation catalyst and selective catalytic reduction catalysts in diesel engine

Renewable and Sustainable Energy Reviews ◽

10.1016/j.rser.2021.111286 ◽

2021 ◽

Vol 148 ◽

pp. 111286

Author(s):

Ibrahim Aslan Resitoglu

Keyword(s):

Diesel Engine ◽

Selective Catalytic Reduction ◽

Catalytic Reduction ◽

Diesel Oxidation Catalyst ◽

Oxidation Catalyst ◽

Diesel Oxidation ◽

Reduction Catalysts

Download Full-text

Development of a Low Emissions Upgrade Kit for EMD GP20D and GP15D Locomotives

ASME 2012 Internal Combustion Engine Division Fall Technical Conference ◽

10.1115/icef2012-92128 ◽

2012 ◽

Author(s):

Steven G. Fritz ◽

John C. Hedrick ◽

Tom Weidemann

Keyword(s):

Fuel Injection ◽

Diesel Oxidation Catalyst ◽

Oxidation Catalyst ◽

Particulate Filter ◽

Injection Timing ◽

Fuel Injection Timing ◽

Tier 1 ◽

Emission Regulations ◽

Diesel Oxidation ◽

Tier 3

This paper describes the development of a low emissions upgrade kit for EMD GP20D and GP15D locomotives. These locomotives were originally manufactured in 2001, and met EPA Tier 1 locomotive emission regulations. The 1,491 kW (2,000 HP) EMD GP20D locomotives are powered by Caterpillar 3516B engines, and the 1,119 kW (1,500 HP) EMD GP15D locomotives are powered by Caterpillar 3512B engines. CIT Rail owns a fleet of 50 of these locomotives that are approaching their mid-life before first overhaul. Baseline exhaust emissions testing was followed by a low emissions retrofit development focusing on fuel injection timing, crankcase ventilation filtration, and application of a diesel oxidation catalyst (DOC), and then later a diesel particulate filter (DPF). The result was a EPA Tier 0+ certification of the low emissions upgrade kit, with emission levels below EPA Line-Haul Tier 3 NOx, and Tier 4 HC, CO, and PM levels.

Download Full-text