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LIBRIS Formathandbok  (Information om MARC21)
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020 z 9789175953922
024a uri
024a urn:nbn:se:kth:diva-1585492 urn
040 a S
041a eng
042 9 EPLK
100a Andersson, Robert4 aut
2451 0a Catalytic conversion of syngas to higher alcohols over MoS 2 -based catalystsh [Elektronisk resurs]
264 1a Stockholm :b KTH Royal Institute of Technology,c 2015
300 a ix, 106
490a TRITA-CHE-Report,x 1654-1081
500 a <p>QC 20150115</p>
500 a Härtill 4 uppsatser
500 a Teknologie doktorsexamen
500 a Degree of Doctor of Philosophy
502 a Diss. (sammanfattning) Stockholm : Kungliga Tekniska högskolan, 2015
506a gratis
520 a The present thesis concerns catalytic conversion of syngas (H 2 + CO) into a blend of methanol and higher alcohols, an attractive way of producing fuels and chemicals. This route has the potential to reduce the oil dependence in the transport sector and, with the use of biomass for the syngas generation, produce CO 2 -neutral fuels. Alkali promoted MoS 2 -based catalysts show a high selectivity to higher alcohols, while at the same time being coke resistant, sulfur tolerant and displaying high water-gas shift activity. This makes this type of catalyst especially suitable for being used with syngas derived from biomass or coal which typically has a low H 2 /CO-ratio. This thesis discusses various important aspects of higher alcohol synthesis using MoS 2 -based catalysts and is a summary of four scientific papers. The first part of the thesis gives an introduction to how syngas can be produced and converted into different fuels and chemicals. It is followed by an overview of higher alcohol synthesis and a description of MoS 2 -based catalysts. The topic alcohol for use in internal combustion engines ends the first part of the thesis. In the second part, the experimental part, the preparation of the MoS 2 -based catalysts and the characterization of them are handled. After describing the high-pressure alcohol reactor setup, the development of an on-line gas chromatographic system for higher alcohol synthesis with MoS 2 catalysts is covered (Paper I). This method makes activity and selectivity studies of higher alcohol synthesis catalysts more accurate and detailed but also faster and easier. Virtually all products are very well separated and the established carbon material balance over the reactor closed well under all tested conditions. The method of trace level sulfur analysis is additionally described. Then the effect of operating conditions, space velocity and temperature on product distribution is highlighted (Paper II). It is shown that product selectivity is closely correlated with the CO conversion level and why it is difficult to combine both a high single pass conversion and high alcohol selectivity over this catalyst type. Correlations between formed products and formation pathways are additionally described and discussed. The CO 2 pressure in the reactor increases as the CO conversion increases, however, CO 2 influence on formation rates and product distribution is to a great extent unclear. By using a CO 2 -containing syngas feed the effect of CO 2 was studied (Paper III). An often emphasized asset of MoS 2 -based catalysts is their sulfur tolerance. However, the use of sulfur-containing feed and/or catalyst potentially can lead to incorporation of unwanted organic sulfur compounds in the product. The last topic in this thesis covers the sulfur compounds produced and how their quantity is changed when the feed syngas contains H 2 S (Paper IV). The effect on catalyst activity and selectivity in the presence of H 2 S in the feed is also covered.
650 7a Engineering and Technology2 hsv
650 7a Chemical Engineering2 hsv
650 7a Teknik och teknologier2 hsv
650 7a Kemiteknik2 hsv
650 7a Chemical Engineering2 kth
650 7a Kemiteknik2 kth
653 0a conversion
653 0a higher alcohols
653 0a mixed alcohols
653 0a MoS2
653 0a syngas
700a Boutonnet, Magali4 ths
700a Järås, Sven4 ths
700a Holmen, Anders4 opn
710a KTHb Skolan för kemivetenskap (CHE)4 pbl
772i channel recordw 22698348
7760 8i Annat formatz 9789175953922
830 0a TRITA-CHE-Report,x 1654-1081
8564 0u
8564 0u
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