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About this book

This book not only explores catalysis processes in redox reactions but also proposes a potential after-treatment strategy. Summarizing the authors’ major works, it offers a guidebook for those working on environmental and industrial catalysis. It presents insights into reaction kinetics in a variety of materials and analyzes the external conditions influencing the reaction. As such it is of particular interest to engineers and scientists in the field of material chemistry, chemical engineering and automobile industry. With novel images and illustrations, it provides a new perspective for interpreting soot abatement material and understanding the reaction process and inspires scientists to design new catalysts with moderate redox capacity.

Table of Contents


Chapter 1. Introduction

Diesel engines have been widely popularized as a power source for vehicles owing to its reliable horsepower and excellent fuel economy. In Europe, especially, they occupy an enormous market share in public transportation and private uses. However, the pollution caused by diesel-engine exhausts has become more and more severe in the last decade, while the exhausts of gasoline-fueled engines operated near stoichiometric air/fuel ratio have been successfully cleaned up by three-way catalytic systems. In China, the emission of diesel particulate matter has become one of the primary sources of PM2.5 pollution in cities. The emission from diesel engines is still a teaser, which bothering the scientific researchers and policymakers for years and it is affected by many factors such as the horsepower of vehicles, the composition of diesel, and combustion parameters.

Wenfeng Shangguan, Guchu Zou, Zhi Jiang

Chapter 2. Catalytic Materials for Simultaneous NOx–Soot Removal

The catalysts are the major challenge for this scheme. Both soot oxidation and NOx reduction should be considered and evaluated; it is tough to balance the two aspects mentioned above. Also, the material is required to be thermally stable in oxygen-rich conditions up to high temperature (above 700 °C); in this way, it could survive the thermal load impact. Naturally, oxides are firstly tested due to their thermal stability and activity.

Wenfeng Shangguan, Guchu Zou, Zhi Jiang

Chapter 3. Kinetics Study for Simultaneous Removal of Soot and NOx

Chemical kinetics is the study of the rate and mechanism by which a chemical species is converted to another. The gas reaction over solid catalysts have been widely explored and investigated; some mechanisms were reliably clear for a specific system. Such catalysts depend on their activity in part, at least, on the extent of surface area because it adsorbs gas reactants and serves as the site where the catalytic reactions proceed [1]. It is especially difficult to resolve the reaction mechanism involving solid since the process itself is unsteady. It is confirmed that the reaction takes place at the solid–solid–gas interface, the specific surface area is of less importance than in the usual solid–gas reaction. This indicates the untraditional and complicated mechanism for this heterogeneous reaction.

Wenfeng Shangguan, Guchu Zou, Zhi Jiang

Chapter 4. Influencing Factors for Simultaneous NOx–Soot Removal

Apart from the material and kinetics, other several factors are affecting the multiplex reaction, simultaneous NOx–soot removal via catalysts. It is believed that most catalytic reactions occur on the surfaces. Hence, the discussions on surface modification in addition to composition design are indispensable to this process. The surface modifications by a variety of preparation techniques will consequently cause the alteration of many macrolevel parameters including surface areas and morphology and in turn influence the reactant/intermediate adsorption and desorption behaviors on the surface.

Wenfeng Shangguan, Guchu Zou, Zhi Jiang

Chapter 5. Conclusion and Prospects

This book focuses on research on the simultaneous NOx–soot removal via catalysis to purify the exhaust from diesel engines. Diesel engines have been widely popularized as a power source for vehicles owing to its reliable horsepower and excellent fuel economy. However, the emission from diesel engines is still a teaser. Simultaneous NOx–soot removal via catalysis is one of the fundamental reactions, which serves as a bridge between soot and NOx, one pair of pollutions with trade-off relations. Extensive concerns have risen to this strategy since current diesel engine after-treatment processes suffering severe problems, such as complicated system and by-product disposal. To date, various catalysts have been investigated to achieve the above goal.

Wenfeng Shangguan, Guchu Zou, Zhi Jiang
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