CLEERS Teleconferences

Palladium speciation in Pd-zeolite passive NOx adsorbers Mark Crocker University of Kentucky Abstract: Pd-exchanged zeolites have been extensively investigated for their performance as Passive NOx Adsorbers (PNAs), although much remains to be understood about the deactivation of these materials in the presence of exhaust gas components such as H2, H2O, and CO. In this study, ...

Pt Catalyzed NH3 Oxidation: From Nitric Acid to Diesel Emission Control Mike Harold University of Houston Abstract: Ammonia (NH3) is an important molecule with conflicting roles. On the one hand, NH3 is a commodity chemical; its manufacture is integral to the production of fertilizers and polyamides. The oxidation of NH3 on Pt to NOx (x ...

Review of Vehicle Engine Efficiency and Emissions Ameya Joshi Corning Abstract: Images of clear skies due to reduced human activity in recent times shows what is possible with cleaner mobility. With tightening regulations and adoption of the latest technologies have the potential to make clean air a permanent reality. This is a review of these ...

Technology Solutions for Cleaning-Up Heavy-Duty Vehicles Michael Geller MECA Abstract: This presentation includes results from two recent MECA-authored white papers that assess market-ready technologies being commercialized by suppliers of emission control and efficiency components for heavy-duty diesel vehicles to meet lower intermediate standards for NOx by 2024 as well as final standards in 2027. The ...

Review of Vehicle Engine Efficiency and Emissions Dr. Ameya Joshi Corning Incorporated Abstract: To say that 2020 was a special year would be an understatement. While we would like to forget most of it, there were major changes to the mobility sector and the drive towards sustainable transportation which are worth reviewing – and will ...

Structural Interconversion of Agglomerated Pd Domains and Mononuclear Pd Sites in CHA Zeolites for Passive NOx Adsorption Dr. Raj Gounder Purdue University Abstract: Pd-exchanged chabazite (CHA) zeolites have received interest as passive NOx adsorbers (PNA) that mitigate vehicular NOx emissions during cold-start conditions. Mononuclear Pd cations are proposed precursors to low-temperature NO adsorption sites. In ...

Challenges in emission control of natural gas and hydrogen engines Prof. Olaf Deutschmann Karlsruhe Institute of Technology Abstract: Lean-operated internal combustion engines fueled by natural gas (NG) or hydrogen have attracted a lot of interest recently due to their potential to reduce or avoid emissions of greenhouse gases. Since the fuel is burnt by air ...

Laser-based Ammonia Imaging and Prospects for other Applications of Absorption Spectroscopy in Aftertreatment Systems Prof. Scott Sanders University of Wisconsin Abstract: First, this talk will describe ammonia imaging experiments performed at Cummins Emission Solutions.  In that work, we used a 10.4 um laser to image ammonia concentration in a diesel aftertreatment system.  Optical access through ...

Computational Modeling of Condition and Particle Size Effects on the Interconversion between Nanoparticles and Cations in Pd-exchanged SSZ-13 Zeolites Prof. Chris Paolucci University of Virginia Abstract: Metal-exchanged zeolites, though often exhibiting enhanced resistance to reduction and sintering in comparison to other supported metal cation counterparts, may gradually lose their potency in reducing environments. Optimization of ...

Coupled Uptake and Conversion of NOx and Reductants on Pd/SSZ-13: Experiments and Modeling Prof. Mike Harold University of Houston Abstract: The trapping of NO in the presence of various reductants (CO, H2, C2H4, and C12H26) and H2O over a Pd/SSZ-13 washcoated Passive NOx Adsorber (PNA) monolith is examined through a combination of experiments, molecular and ...