Diesel Soot Catalysis

A special issue of Catalysts (ISSN 2073-4344). This special issue belongs to the section "Environmental Catalysis".

Deadline for manuscript submissions: closed (30 June 2019) | Viewed by 3133

Special Issue Editor


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Guest Editor
Department of Inorganic Chemistry and Institute of Materials, University of Alicante, Sant Vicent del Raspeig, 03690 Alicante, Spain
Interests: ceria-based materials; removal of pollutants from vehicles; soot combustion; NOx reduction; PNA; co oxidation at low temperatures; dry reforming of methane; diesel soot catalysis

Special Issue Information

Dear Colleagues,

Among the different alternatives to mitigate the Particulate Matter emissions from diesel vehicles, the entrapment of particulates from exhaust gases by Diesel Particulate Filters (DPFs) has received much interest in recent years. However, the soot that forms diesel exhaust particulate can be burnt off at temperatures above 600 °C, whereas typical diesel engine exhaust temperatures fall within the 200–500 °C range. Therefore, oxidation catalysts are necessary to increase the oxidation rate of filter traps at low temperatures. Moreover, the feasibility of soot combustion depends to a great extent on the catalyst–soot contact conditions, and it is therefore necessary to maximize the interaction between the soot particles and the catalyst, both of which are solid materials. In recent years, many soot oxidation catalyst formulations have been investigated and the most promising catalytic technologies focus on stable materials that exhibit high mobility of the oxidizing species able to be effectively transferred to the soot surface under the operating conditions required for this demanding application.

The purpose of this Special Issue is to cover promising recent research and novel trends in the field of diesel soot oxidation catalysis. Welcome are studies addressing challenges in: (1) novel catalytic materials and catalysts designs (2) scientific understanding of reaction pathways and kinetics (3) strategies for catalytic coatings into DPFs and filter regeneration and (4) coated-DPF modelling and simulation approaches.

Prof. Dr. Avelina García-García
Guest Editor

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Keywords

  • Diesel exhaust
  • Soot catalytic oxidation
  • Soot/catalyst contact
  • Mechanisms assisting diesel soot combustion
  • Mixed oxides
  • Active-oxygen species
  • Coated-Diesel Particulate Filters
  • Filter regeneration

Published Papers (1 paper)

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Research

15 pages, 3599 KiB  
Article
Reactive Fe-O-Ce Sites in Ceria Catalysts for Soot Oxidation
by Boyu Li, Abhishek Raj, Eric Croiset and John Z. Wen
Catalysts 2019, 9(10), 815; https://0-doi-org.brum.beds.ac.uk/10.3390/catal9100815 - 28 Sep 2019
Cited by 12 | Viewed by 2778
Abstract
This study investigates the role of oxygen vacancy on Fe-doped CeO2 catalyst activity for soot oxidation. The oxygen vacancy was assessed through Ce3+ content. The Fe content was varied between 0 and 30% for two catalyst preparation methods, co-precipitation (CP) and [...] Read more.
This study investigates the role of oxygen vacancy on Fe-doped CeO2 catalyst activity for soot oxidation. The oxygen vacancy was assessed through Ce3+ content. The Fe content was varied between 0 and 30% for two catalyst preparation methods, co-precipitation (CP) and solution combustion synthesis (SCS). X-ray photoelectron spectroscopy indicates that ceria exists as both Ce4+ and Ce3+, while iron is present only as Fe3+. The catalyst’s activity was evaluated by ignition (T10) and combustion (T50) temperatures using thermogravimetric analysis. Optimum Fe contents yielding the highest activity were found to be 10% and 5% for CP and SCS catalysts, respectively. The surface area and morphology showed a moderate effect on catalyst activity, because catalytic soot oxidation involves solid–solid contact. More importantly, regardless of the fabrication method, it was found that Ce3+ content, which is closely related to oxygen vacancies, plays the most important role in affecting the catalyst activity. Full article
(This article belongs to the Special Issue Diesel Soot Catalysis)
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