Diploma Thesis Defense by Mr Konstantinos Marmanidis
Thesis Title: «Effect of the nature of the support and operating parameters for the production of hydrogen (H2) via propane steam reforming reaction. »
Thursday 8 July 2021, at: 10:00
Αίθουσα: https://tuc-gr.zoom.us/j/93072004248?pwd=elptVWI3R0ZrUE1sT21aUTEvQnB1dz09
Meeting ID: 930 7200 4248
Password: 677415
Examination Committee
- Paraskevi Panagiotopoulou (advisor)
- Ioannis V. Yentekakis
- Apostolos Giannis
Abstract
The aim of this study is the investigation of the effect of the nature of the support and the operational parameters on H2 hydrogen production through the steam propane reformation reaction. Two rodium (Rh) catalysts were examined, with a loading of 0.5 wt.% supported on the composite metal oxides 10 wt.% La2O3-Al2O3 and 10 wt.% Gd2O3-Al2O3. Among the two catalysts investigated optimal behavior was exhibited by 0.5%Rh/10%La2O3-Al2O3, as even at low reaction temperatures (~575 °C) achieves high propane conversion and high selectivity toward H2. However, at temperatures below 450 °C the reaction is not affected by the nature of the support, with the two catalysts exhibiting similar behavior. For these two catalysts, the effect of the Steam:C ratio was examined on the range of 2.00-7.00, as well as the effect of the Gas Hourly Space Velocity (GHSV) between 23100 and 107800h-1 for 0.5%Rh/10%La2O3-Al2O3 catalyst and between 24200 and 112700h-1 for 0.5%Rh/10%Gd2O3-Al2O3 catalyst. The results showed that an increase in the Steam:C ratio leads to a shift in the propane conversion curve towards significantly lower temperatures for both catalysts examined. Decreasing GHSV leads to an improvement of catalytic performance for temperatures higher than 450 °C. At lower reaction temperatures the propane conversion remains practically unaffected by varying GHSV. The most active 0.5%Rh/10%La2O3-Al2O3 catalyst was examined under realistic reaction conditions in pellet form and using a GHSV of 9000 h-1. The results showed that this catalyst exhibits exceptional activity, selectivity and stability and is therefore a promising catalyst for H2 production via propane steam reformation reaction.
