Change search
ReferencesLink to record
Permanent link

Direct link
Hydrogen generation from dimethyl ether by autothermal reforming
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology.
2007 (English)Licentiate thesis, comprehensive summary (Other scientific)
Abstract [en]

Heavy-duty trucks are in idle operation during long periods of time, providing the vehicles with electricity via the alternator at standstill. Idling trucks contribute to large amounts of emissions and high fuel consumption as a result of the low efficiency from fuel to electricity. Truck manufacturers are working to develop equipment using auxiliary power units to supply the trucks with electricity, which operate independently of the main engine. Fuel cell-based auxiliary power units could offer high efficiencies and low noise and vibrations. The hydrogen required for the fuel cell can be generated in an onboard fuel reformer. This thesis is devoted to hydrogen generation from dimethyl ether, DME, by autothermal reforming focusing on the application of fuel cell auxiliary power units. In the search for alternative fuels, DME has lately been identified as a promising diesel substitute.

The first part of the thesis gives an introduction to the field of DME reforming with a literature survey of recent studies within the area. Included are also results from thermodynamic equilibrium calculations.

In the following parts of the thesis, experimental studies on autothermal reforming of DME are presented. A reformer constructed to generate hydrogen to feed a 5 kWe polymer electrolyte fuel cell is evaluated with emphasis on trying to work close to a practically viable process, i.e. without external heating and using gas mixtures resembling real conditions. Additional experiments have been conducted to investigate the use of catalytic oxidation of dimethyl ether as a heat source during startup. The results of these studies are presented in Paper I.

In the second experimental study of this thesis, which is presented in Paper II, Pd-based monolithic catalysts are evaluated at small scale for use in autothermal reforming of DME. A screening of various catalyst materials has been performed followed by a study of the influence on the product composition of varying operating parameters such as oxygen-to-DME ratio, steam-to-DME ratio, and temperature.

Place, publisher, year, edition, pages
Stockholm: KTH , 2007. , 62 p.
Trita-CHE-Report, ISSN 1654-1081 ; 2007:34
Keyword [en]
autothermal reforming, auxiliary power unit, dimethyl ether, fuel cell, hydrogen, palladium, reforming catalyst, temperature-programmed reduction, truck idling, X-ray diffraction, zinc
National Category
Chemical Engineering
URN: urn:nbn:se:kth:diva-4434ISBN: 978-91-7178-673-9OAI: diva2:12299
2007-06-07, 591, Teknikringen 42, Stockholm, 13:00
QC 20101115Available from: 2007-06-13 Created: 2007-06-13 Last updated: 2010-11-15Bibliographically approved

Open Access in DiVA

fulltext(2952 kB)1348 downloads
File information
File name FULLTEXT01.pdfFile size 2952 kBChecksum SHA-1
Type fulltextMimetype application/pdf

Search in DiVA

By author/editor
Nilsson, Marita
By organisation
Chemical Engineering and Technology
Chemical Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 1348 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 559 hits
ReferencesLink to record
Permanent link

Direct link