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Synthesis of NaX coated honeycombs in a continuous flow reactor
2010 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The aim of this work was to grow zeolite NaX on ceramic cordierite monolith wall in a continuous flow reactor. Zeolite NaX is interesting for CO2 adsorption and has already been synthesized in a batch reactor. Growing it in a continuous flow reactor should allow faster production. This work has been done to determine whether it is feasible or not and to optimize the process in case of success. In this report, we show that it is clearly feasible, especially as demonstrated by two samples. One film was grown on a 1200 channels per square inch (cpsi) support that was coated with aluminum oxide. The other was grown on a 400 cpsi monolith. Both were synthesized with a flow rate of 6 mL/min which produced a better film than what was obtained in a batch reactor. However, more synthesis solution was required. Considering the optimization of the process, it is shown that one of the main issues is the formation of a bubble under the monolith that plugs the entrance of some of the channels and causes the formation of a film of very bad quality. This can be avoided by using a different setup. The temperature tests showed that it is possible to grow the film already at 80°C, and also that the film synthesis at 100°C was difficult to control, with a lot of parasite reactions. The synthesis solution also needs to be optimized to obtain better results. The best solution used herein contained 10% more aluminum than the standard recipe, but further increase of the aluminum content might also improve the synthesis. The last parameter that has been studied is the flow rate. Increasing the flow rate results in better films but a part of the reactants is wasted because it does not react. This parameter is directly linked to the reactants concentration and temperature. It needs to be optimized accordingly.

Place, publisher, year, edition, pages
Keyword [en]
Physics Chemistry Maths
Keyword [sv]
Fysik, Kemi, Matematik
URN: urn:nbn:se:ltu:diva-57899ISRN: LTU-PB-EX--10/076--SELocal ID: e85643fb-13ee-4de1-ba81-4b71c93a1e93OAI: diva2:1031287
Subject / course
Student thesis, at least 30 credits
Educational program
Chemical Engineering, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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