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Optimized H2O2 production in a trickled bed reactor, using water and methanol enriched with selectivity promoters
Process Chemistry Centre, Laboratory of Industrial Chemistry and Reaction Engineering, Åbo Akademi, Turku/Åbo, Finland.
Umeå University, Faculty of Science and Technology, Department of Chemistry. Process Chemistry Centre, Laboratory of Industrial Chemistry and Reaction Engineering, Åbo Akademi, Turku/Åbo, Finland.
Department of Chemical Engineering and Environmental Technology, High Pressure Processes Group, University of Valladolid, Spain.
Process Chemistry Centre, Laboratory of Industrial Chemistry and Reaction Engineering, Åbo Akademi, Turku/Åbo, Finland.
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2015 (English)In: Chemical Engineering Science, ISSN 0009-2509, E-ISSN 1873-4405, Vol. 123, 334-340 p.Article in journal (Refereed) Published
Abstract [en]

In the present work a comparison between two different working solutions in the H2O2 catalytic direct synthesis (CDS) was studied in a continuous reactor. The two working solutions (i.e. water and methanol) were chosen due to their large use in the catalytic direct synthesis. Both the working solutions have advantages and drawbacks: it is well known that methanol is mainly used due to the possibility of higher H2 and O2 solubilization compared to water, while water is the “greenest” solvent for excellence. Different parameters such as temperature, gas flow rate and catalyst amount were studied in order to identify the major differences between water and methanol. A study to compare the gases solubility in our conditions in water and methanol was performed in order to understand how gas solubility can affect the reaction. Gas solubility was found to be 10 times higher in methanol compared to water. Consequently the consumption of the reagents was faster in methanol compared to water. Unexpectedly, the final concentration of H2O2 was comparable between water and methanol working solutions at the different operations conditions studied. This indicated that the transport phenomena are important to fine tune the reaction path. The maximum H2O2 was around 2.3 wt%.

Place, publisher, year, edition, pages
Elsevier, 2015. Vol. 123, 334-340 p.
Keyword [en]
H2O2 direct synthesis, reactor performance, solubility properties, palladium catalyst
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:umu:diva-100330DOI: 10.1016/j.ces.2014.10.040ISI: 000348034500033OAI: oai:DiVA.org:umu-100330DiVA: diva2:791567
Available from: 2015-03-01 Created: 2015-03-01 Last updated: 2017-12-04Bibliographically approved

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Publisher's full texthttp://www.sciencedirect.com/science/article/pii/S0009250914006174

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