Self-Sustained Oscillations of Temperature and Conversion in a Packed Bed Microreactor during 2-Methylpropene (Isobutene) Hydrogenation

0447333 - ÚCHP 2016 RIV NL eng J - Journal Article
Stavárek, Petr - Vajglová, Zuzana - Křišťál, Jiří - Jiřičný, Vladimír - Kolena, J.
Self-Sustained Oscillations of Temperature and Conversion in a Packed Bed Microreactor during 2-Methylpropene (Isobutene) Hydrogenation.
Catalysis Today. Roč. 256, NOV 1 (2015), s. 250-260. ISSN 0920-5861. E-ISSN 1873-4308.
[InternationalCongress of Chemical and Process Engineering CHISA 2014 /21./. Prague, 23.08.2014-27.08.2014]
Institutional support: RVO:67985858
Keywords : hydrogenation * microreactor * oscillation
Subject RIV: CI - Industrial Chemistry, Chemical Engineering
Impact factor: 4.312, year: 2015

Hydrogenation of 2-methylpropene over commercial Platinum catalyst was studied in the packed bed microreactor. The presence of heat and mass transfer limitations was assessed by means of common dimensionless criteria and some experimental diagnostics tests. The analysis results pointed to presence of diffusional limitations, therefore only a limited data set under the kinetic control regime was collected. At certain conditions, the self-sustained spontaneous and reproducible oscillations of 2-methylpropene conversion were observed. Catalyst bed temperature well reflected the course of 2-methylpropene conversion oscillations. The oscillations showed exceptionally long periods ranging from 11 to 22 hours depending on the space velocity. We explain the presence of oscillations as a result of complex interaction between the exothermic reaction, heat transfer and a reversible decrease in the catalyst activity. Possible mechanisms for temporary catalyst activity decrease were proposed.
Permanent Link: http://hdl.handle.net/11104/0249852