University of Twente Student Theses
Concentration Polarization to Measure the Nanopore Accessibility of Fluid Catalytic Cracking Particles
Eidhof, Martijn (2018) Concentration Polarization to Measure the Nanopore Accessibility of Fluid Catalytic Cracking Particles.
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| Abstract: | Fluid catalytic cracking (FCC) particles are an important catalyst for the oil refinery processes. The porous structure of these particles enables large feedstock molecules into the catalyst domain, where they are cracked into smaller hydrocarbons. Deactivation of FCC particles happens by accumulation of the metal atoms Fe, V and Ni in the nanopores of the catalyst domain. Fe, V and Ni are the residue of the cracking process and settle inside the pores, stacking over time and eventually blocking the pores. As the particles age, the density of the FCC particles increases by the stacking of Fe, V and Ni in the nanopores, corresponding to an effective decrease in the nanopore-sizes. In this study, ionic concentration polarization (ICP) effects are measured for different densities of FCC particles, which is related to the effective nanopore size. First particles of similar density fractions will be used to measure differences in ICP effects for different concentrations. When the boundary region of ICP effects is found, meaning the region in which ICP effects are barely observable to the region in which these are not observable, the limit of the concentration for these ICP effects will be approached to measure differences in ICP effects for the different density fractions. If there are differences in ICP for the different density fractions of FCC particles, the ICP effects will vary more when the limit of ICP is approached. This study reveals that differences in ICP can indeed be measured for different concentrations of electrolyte. Furthermore, there are inconsistent differences measured in ICP between the different density fractions of FCC particles. This implies that ICP cannot be used to measure the nanopore accessibility of FCC particles. |
| Item Type: | Essay (Bachelor) |
| Faculty: | EEMCS: Electrical Engineering, Mathematics and Computer Science |
| Subject: | 50 technical science in general, 51 materials science, 53 electrotechnology |
| Programme: | Electrical Engineering BSc (56953) |
| Link to this item: | https://purl.utwente.nl/essays/76596 |
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