Perovskite Catalyst for In-Cylinder Coating to Reduce Raw Pollutant Emissions of Internal Combustion Engines

Xiaochao Wu; Marcus Fischer; Adrian Nolte; Pia Lenßen; Bangfen Wang; Thorsten Ohlerth; Dominik Wöll; Karl Alexander Heufer; Stefan Pischinger; Ulrich Simon

doi:10.1021/acsomega.1c06530

Perovskite Catalyst for In-Cylinder Coating to Reduce Raw Pollutant Emissions of Internal Combustion Engines

ACS Omega. 2022 Feb 4;7(6):5340-5349. doi: 10.1021/acsomega.1c06530. eCollection 2022 Feb 15.

Authors

Xiaochao Wu^{1

2}, Marcus Fischer³, Adrian Nolte⁴, Pia Lenßen⁵, Bangfen Wang^{1

2}, Thorsten Ohlerth¹, Dominik Wöll⁵, Karl Alexander Heufer⁴, Stefan Pischinger^{3

2}, Ulrich Simon^{1

2}

Affiliations

¹ Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1a, 52074 Aachen, Germany.
² Center for Automotive Catalytic Systems Aachen, RWTH Aachen University, 52062 Aachen, Germany.
³ Chair for Thermodynamics of Mobile Energy Conversion Systems, RWTH Aachen University, Forckenbeckstraße 4, 52072 Aachen, Germany.
⁴ Chair of High Pressure Gas Dynamics, RWTH Aachen University, Schurzelter Str. 35, 52074 Aachen, Germany.
⁵ Institute of Physical Chemistry, RWTH Aachen University, Landoltweg 2, 52074 Aachen, Germany.

Abstract

Aiming to achieve the highest combustion efficiency and less pollutant emission, a catalytic coating for cylinder walls in internal combustion engines was developed and tested under several conditions. The coating consists of a La_0.8Sr_0.2CoO₃ (LSCO) catalyst on an aluminum-based ceramic support. Atomic force microscopy was applied to investigate the surface roughness of the LSCO coating, while in situ diffuse infrared Fourier transform spectroscopy was used to obtain the molecular understanding of adsorption and conversion. In addition, the influence of LSCO-coated substrates on the flame quenching distance was studied in a constant-volume combustion chamber. Investigations conclude that an LSCO coating leads to a reduction of flame quenching at low wall temperatures but a negligible effect at high temperatures. Finally, the influence of LSCO coatings on the in-cylinder wall-near gas composition was investigated using a fast gas sampling methodology with sample durations below 1 ms. Ion molecule reaction mass spectrometry and Fourier transform infrared spectroscopy revealed a significant reduction of hydrocarbons and carbon monoxide when LSCO coating was applied.