Catalytic Effect of Potassium Compounds in Soot Oxidation

Alexander Rinkenburger, Takaaki Toriyama, Kazuhiro Yasuda, Reinhard Niessner

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

The combustion temperatures of soot in particulate filters can be decreased to exhaust gas temperatures by using catalysts. In addition to oxidic catalysts, alkali metal salts are very effective catalysts. Although soot is one of the world's most unwanted byproducts, combustion is still not fully understood. In this study, different soot mixed internally with salt samples were produced. All salts lead to a marked, salt- and salt-content-dependent decrease of the temperature-programmed oxidation temperatures of maximum CO + CO2 emissions (Tmax), with K2CO3 being one of the most effective catalysts that leads to a decrease of the Tmax of up to 300 °C. Structural parameters of the internally mixed soot derived by using Raman microspectroscopy, SEM, and scanning mobility particle size analysis did not change significantly; BET areas showed slight trends to lower areas with increased salt content, but no substantial correlations were observed. In contrast, a correlation of the oxidation reactivity to the number distribution of the measured actual fringe lengths by using high-resolution transmission electron microscopy and the peak areas measured by using EPR spectroscopy was found. Salts lead to a narrowing of the actual fringe length number distributions to lower sizes and to reduced EPR peak areas. This demonstrates that the salts influence the nanostructure of the graphene planes by shortening the planes and further substantiates that soot oxidation is at least partly based on electron transfer and not only oxygen transfer. EPR spectroscopy measurements indicate that the oxidation mechanism is based on a temperature-dependent chemical equilibrium, which depends on the K+/anion binding strength.

Original languageEnglish
Pages (from-to)3513-3525
Number of pages13
JournalChemCatChem
Volume9
Issue number18
DOIs
Publication statusPublished - Sep 22 2017

Fingerprint

Potassium Compounds
Potassium compounds
potassium compounds
Soot
soot
Salts
salts
Oxidation
oxidation
Paramagnetic resonance
catalysts
Catalysts
Temperature
Spectroscopy
fluid filters
Alkali Metals
combustion temperature
exhaust gases
Graphite
Alkali metals

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry

Cite this

Catalytic Effect of Potassium Compounds in Soot Oxidation. / Rinkenburger, Alexander; Toriyama, Takaaki; Yasuda, Kazuhiro; Niessner, Reinhard.

In: ChemCatChem, Vol. 9, No. 18, 22.09.2017, p. 3513-3525.

Research output: Contribution to journalArticle

Rinkenburger, A, Toriyama, T, Yasuda, K & Niessner, R 2017, 'Catalytic Effect of Potassium Compounds in Soot Oxidation', ChemCatChem, vol. 9, no. 18, pp. 3513-3525. https://doi.org/10.1002/cctc.201700338
Rinkenburger, Alexander ; Toriyama, Takaaki ; Yasuda, Kazuhiro ; Niessner, Reinhard. / Catalytic Effect of Potassium Compounds in Soot Oxidation. In: ChemCatChem. 2017 ; Vol. 9, No. 18. pp. 3513-3525.
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