An integrated system for energy-efficient exhaust aftertreatment for heavy-duty vehicles
Book chapter, 2015

© Springer International Publishing Switzerland 2015. This chapter presents a unique system approach applied in a joint academic- industrial research programme, E4 Mistra, to attain the goals of high energy efficiency and low emissions in an exhaust aftertreatment system for heavy-duty vehicles. The high energy efficiency is achieved by heat recuperation, onboard hydrogen production for NOx reduction, and by finding new solutions for making the aftertreatment system active at low exhaust temperatures. To reach low particulate emissions, a mechanical filter using a sintered metal powder is developed and coated with catalytic material to improve the soot oxidation efficiency. Low NOx emissions are achieved by an efficient NOx reduction catalyst. The integrated E4 Mistra system comprises four technological advances: thermoelectric (TE) materials for heat recuperation, catalytic reduction of NOx over innovative catalyst substrates using either the onboard diesel or biodiesel, H2 from a high-efficiency fuel reformer, and particulate filtration over a porous metal filter. The TE materials are used in a TE generator (TEG) which converts thermal energy into electricity. The TEG is used to recuperate heat from the exhaust-gas recirculation (EGR) circuit of heavy-duty trucks and is expected to generate ~1 kW electric power from 20 kW heat in the exhaust gas. The TEG is integrated in a plate heat exchanger (HEX) designed particularly for this application. Apart from the knowledge and experiences in TEG and heat exchange technologies, a thorough fluid dynamics and TE analysis are performed in this project to understand the governing processes and optimize the system accordingly. The components of the E4 Mistra system are explained in the chapter in addition to test results, which show the system's capacity for H2 production, NOx conversion, particulate matter filtration and soot oxidation, and finally electric power generation via heat recuperation from the exhaust gas using the developed TEG-HEX system.

Emission control

Hydrogen production

Energy efficiency

Thermoelectric generators



Volvo Cars

Lennart Andersson

Volvo Cars

Lars Pettersson

Royal Institute of Technology (KTH)

Moa Ziethèn Granlund

Royal Institute of Technology (KTH)

Hanna Härelind

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry

Fredrik Gunnarsson

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry

Anders Palmqvist

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry

Richard Heijl

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry

Ronnie Andersson

Chalmers, Chemistry and Chemical Engineering, Chemical Technology

Olle Högblom

Chalmers, Chemistry and Chemical Engineering, Chemical Technology

Lennart Holmgren

Termo-Gen AB

Per Olof Larsson


Fredrik Andreasson

Alfa Laval Lund AB

Renewable Energy in the Service of Mankind

9783319177779 (ISBN)

Subject Categories

Energy Engineering

Chemical Process Engineering

Energy Systems



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