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Topics in Catalysis

, Volume 59, Issue 10–12, pp 1049–1053 | Cite as

Durability Evaluations and Rapid Ageing Methods in Commercial Emission Catalyst Development for Diesel, Natural Gas and Gasoline Applications

  • T. MaunulaEmail author
  • K. Kallinen
  • A. Savimäki
  • T. Wolff
Original Paper

Abstract

The ageing conditions were analyzed with gasoline, diesel and natural gas (NG) catalysts to find the simplified, rapid thermal and chemical (sulfur) ageing methods for catalyst development. Rich-stoichiometric conditions prevented the deactivation of TWCs in gasoline and NG applications. Active metals and support are sintered thermally during short lean periods by increasing deactivation as a function of oxygen concentration. Air ageing for 3–10 h is an appropriate rapid ageing method for TWCs. Active regeneration conditions for DPF with a higher carbon concentration deactivated DOCs less than normal diesel exhaust conditions at 700 °C. Natural gas oxidation catalysts were sulfated in use conditions but almost complete recovery was possible above 600 °C with higher methane feeds at lean. In addition to sulfur, other chemical poisoning was also included in the rapid ageing methods by fittings to the diesel and NG field aged catalysts.

Keywords

Emissions Catalysts Deactivation TWC DOC SCR DPF 

Abbreviations

ATS

After-treatment system

CPF

Catalyzed particulate fliter

DOC

Diesel oxidation catalyst

DPF

Diesel particulate filter

EGA

Exhaust gas ageing

EGAL

Exhaust gas ageing-low HC

FSCR

Filter with SCR coating

HC

Hydrocarbons

HDD

Heavy-duty diesel

HDLG

Heavy-duty lean gas

HDSG

Heavy-duty stoichiometric gas

HTx

Hydrothermal ageing at x °C, where x = 700–900

LDD

Light-duty diesel

LDG

Light-duty gasoline/gas

LG

Lean gas

LNT

Lean NOx trap

MOC

Methane oxidation catalyst

NG

Natural gas

RAH2

Rapid ageing with two parallel converters

PGM

Platinum group metals like platinum, palladium and rhodium

PM

Particulate matter

+S

Sulfation

−S

Desulfation

SCR

Selective catalytic reduction

SV

Space velocity, exhaust gas flow rate/catalyst volume, h−1

THC

Total hydrocarbons

TWC

Three-way catalyst

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Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  • T. Maunula
    • 1
    Email author
  • K. Kallinen
    • 1
  • A. Savimäki
    • 1
  • T. Wolff
    • 2
  1. 1.Innovations and R&D, Catalyst DevelopmentDinex Ecocat OyOuluFinland
  2. 2.Innovations and R&DDinex GmbHBindlachGermany

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