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Novel Ammonia Storage Materials for SCR Systems: Carbon Materials – Salt Composites
Luleå University of Technology, Department of Engineering Sciences and Mathematics.
2019 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The emissions of nitrogen oxides (NOx) are a serious environmental problem due to its relationship with the formation of smog, acid rain and because they are dangerous for human and animal health. These gases are produced in high quantities in diesel engines used for automotive applications, and different strategies are being used to reduce them, among which are the Selective Catalytic Reduction (SCR) systems. For its operation, it is necessary a supply of ammonia as NOx reducing agent, but the inefficiency at low temperatures of the systems used nowadays has led to the conception of the solid ammonia storage units (ASS). Unfortunately, the materials currently used, i.e. metal halides, do not meet the ammonia supply requirements at low temperatures and have problems of swelling and agglomeration.

In order to find a material with better properties for its application as an ammonia sorbent material, MgCl2 composites with different carbon materials (graphite, graphene, and SWCNTs) were prepared by direct mixing and wet impregnation methods, and characterized in this work. Despite the decrease of total storage capacity, improvements were found in thermal stability and mass retention, as well as in sorption and desorption kinetics, making these materials a first result towards the improvement of the solid ammonia storage units.

Place, publisher, year, edition, pages
2019. , p. 61
Keywords [en]
magnesium chloride, ammonia, carbon materials, SCR, NOx reduction, sorption
National Category
Composite Science and Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-75167OAI: oai:DiVA.org:ltu-75167DiVA, id: diva2:1333451
Subject / course
Student thesis, at least 30 credits
Educational program
Materials Engineering, master's level (120 credits)
Supervisors
Examiners
Available from: 2019-07-01 Created: 2019-07-01 Last updated: 2019-07-01Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
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