Hydrocarbon decomposition on oxygen permeable perovskite membranes

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.advisor Kihlman, Johanna
dc.contributor.author Yan, Chao
dc.date.accessioned 2015-11-19T11:29:42Z
dc.date.available 2015-11-19T11:29:42Z
dc.date.issued 2015-11-10
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/18696
dc.description.abstract Synthesis gas (CO+H2) can be produced via various pathways such as steam reforming, partial oxidation as well as autothermal reforming. Steam reforming is strongly endothermic and partial oxidation is weakly exothermic. By combing of the steam reforming and partial oxidation process can be operated at autothermal conditions (autothermal reforming). However, using the pure oxygen as oxidant is quite expensive and using the air would have the nitrogen content in the downstream processes. Oxygen permeable membrane enables the oxygen ions to be selectively transported through the membrane by blocking the nitrogen and other gases outside. In the literature part of the study, the mechanism and applications of the perovskite membranes as well as the preparation methods were introduced. There were 12 membranes (A-H) tested in this thesis for toluene decomposition on the perovskite membrane under different temperatures, air flow rates, toluene amounts, bottom flow rate of toluene and nitrogen. Furthermore, the effect of the steam and gasification gas at atmospheric pressure were investigated. The results showed that the oxygen flux increased with the increased temperature and air flow rate. Higher bottom flow rate (2 l/min) of toluene and nitrogen results in lower oxygen flux value and the toluene amount has less effects on the oxygen permeability. Moreover, the oxygen flux reached to 3.03 ml/min*cm2 at 900 oC, air flow rate of 0.45 l/min and total bottom flow of 0.5 l/min by adding the gasification gas, of which oxygen flux value of 1.8 ml/min*cm2 for a normal run under the same condition. Regarding to the toluene conversion, it was clear that the toluene conversion increased with the increase of the temperature and it was higher with the gasification gases than with the steam. In summary, the oxygen fluxes were in the same range from 1.75 to 2.46 ml/min*cm2 and C7 membrane had the highest oxygen flux and the optimal condition for the membrane was high temperature (900 oC), high air flow rate (0.45 l/min),with gasification gases and the optimal toluene amount dependent on the oxygen flux value en
dc.format.extent 85+40
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.title Hydrocarbon decomposition on oxygen permeable perovskite membranes en
dc.type G2 Pro gradu, diplomityö en
dc.contributor.school Kemian tekniikan korkeakoulu fi
dc.subject.keyword synthesis gas en
dc.subject.keyword hydrocarbon decomposition en
dc.subject.keyword oxygen permeable perovskite membranes en
dc.subject.keyword partial oxidation en
dc.identifier.urn URN:NBN:fi:aalto-201511205253
dc.programme.major Process Systems Engineering fi
dc.programme.mcode KE3004 fi
dc.type.ontasot Master's thesis en
dc.type.ontasot Diplomityö fi
dc.contributor.supervisor Lehtonen, Juha
dc.programme Master's Programme in Chemical Technology fi
dc.location PK fi


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