Eling, M. (2021) Effect of WHSV and magnesium impregnation on HZSM-5 catalyst coke formation in MTA-process. Bachelor's Thesis, Chemical Engineering.
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Abstract
In this project, the effect of weight hour space velocity (WHSV) and magnesium impregnation on coke formation during methanol to aromatics (MTA) reaction was investigated. Nitrogen was used as carrier gas in combination with a methanol saturator to lead this gas mixture through a packed-bed reactor. A HZSM-5 catalyst was used in the reactor. The effect of WHSV on coke formation was analysed by changing the amount of catalyst. Magnesium was impregnated in the HZSM-5 catalyst via incipient wetness impregnation with different weight percentages of magnesium. The impregnated catalyst was analysed with XRD, nitrogen physisorption and NH3-TPD. It was found that magnesium impregnation does not affect the crystalline structure but decreases the acidity of the catalyst. Product analysis showed that methane has the highest selectivity of the formed gas products and increases at larger WHSV. It seemed that methane formation is favoured when the catalyst is deactivated. The spent catalyst is analysed with thermogravimetric analysis (TGA). The TGA data shows that decreasing the WHSV decreases coke formation, while magnesium impregnation increases coke formation. The reason for this is higher amounts of catalyst decreases the average coke formation and that lower acidity leads to carbon build-up, which is responsible for coke formation.
| Item Type: | Thesis (Bachelor's Thesis) |
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| Supervisor name: | Xie, J. and Yue, J. |
| Degree programme: | Chemical Engineering |
| Thesis type: | Bachelor's Thesis |
| Language: | English |
| Date Deposited: | 21 Jun 2021 16:18 |
| Last Modified: | 21 Jun 2021 16:18 |
| URI: | https://fse.studenttheses.ub.rug.nl/id/eprint/24657 |
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