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The testing was conducted on two vehicles, one gasoline direct injection (GDI) vehicle and one multiple port injection (MPI) vehicle, with different exhaust systems designs (a close coupled GPF and an under floor GPF) and catalyst coating levels (bare and heavily coated GPFs). Good test repeatability was achieved through carefully controlling testing conditions. ...Also discussed in the paper is a simple analytical 0D model, which can very well capture the mass transport and reaction fundamentals, such as filter design parameters, coating level, engine conditions, and filter operating aspects.

Changes in mat materials, handling technology and coating variables are only a few sources of overall increased system costs. Corning has introduced the Celcor® XS™ product to the market which significantly increases the strength of thin and ultra thin walled substrates.

In order to address this question, experiments were performed to examine the influence of high velocity flow, temperature, impingement angle, particulate characteristics, and coating effect on erosion. Based on the experiment data, it was verified that the erosion phenomenon requires the presence of particulate in the exhaust stream.

This paper describes and reviews tests on a set of various Diesel Oxidation Catalyst configurations (for example cell densities), all with the same catalyst coating. The Diesel Oxidation Catalyst specimens were subjected to the European Stationary Cycle (ESC), the European Transient Cycle (ETC), and the US heavy duty Federal Test Procedure (US FTP).

Various catalyst loadings varying from 120g/l to 540 g/l were washcoated on both standard Celcor® and new high porosity cordierite substrates with standard coating techniques. Simulated laboratory testing of these samples showed that high catalyst loadings improved both low temperature conversion efficiency and high temperature ammonia storage capacity and consequently increased the overall conversion efficiency.

Advanced three-way catalysts improve with layered coating technology, and with improved understanding on engine calibration.