at Google ScholarTitle data
Glowienka, Kevin ; Kern, Christoph ; Jess, Andreas:
Thermal and Catalytic Decomposition of Formic Acid for Synthesis Gas
Production in Liquid Phase.
2015
Event: DGMK Conference Synthesis Gas Chemistry
, 07.-09.10.2015
, Dresden, Deutschland.
(Conference item: Conference
,
Poster
)
Abstract in another language
Formic acid (FA) is known to decompose either to H₂ and CO₂ or to CO and H₂O; hence, FA can be regarded as a source for both hydrogen and carbon monoxide. This aspect offers a novel concept for second generation biofuels by using formic acid as an intermediate in synthesis gas production since with polyoxometalate catalyst, FA forms in high purity from waste biomass. Furthermore, the acid decomposes under very mild conditions. Thus, combining formic acid decomposition with electrolysis from renewable energy leads to neat synthesis gas as feed in Fischer-Tropsch synthesis. Within our research, the focus is on the formic acid decomposition, in particular on CO formation. For this purpose, two different setups are used: a plug flow reactor for gas phase and a semi-batch autoclave for liquid phase formic acid decomposition. In gas phase decomposition, a high selectivity (> 99 %) can be achieved into both reaction pathways depending on the catalyst. Here, supported gold catalysts, e.g. Au/TiO₂, yield H₂, whereas an acidic zeolite leads to CO formation. In the liquid phase, the same Au/TiO₂ catalyst also makes hydrogen, but the product gas contains CO as well because FA decomposes thermally to CO and water under the reaction conditions.
However, the thermal decomposition rate of formic acid depends significantly on the acidity of the system and, thus, on the water content of the substrate. Kinetic modelling of the thermal decomposition leads to a first order reaction with respect to the proton activity that was approximated using Hammett’s acidity function. The kinetic model has been confirmed by increasing the acidity by adding sulphuric acid to the feed; no change in selectivity was observed for FA conversion, and an activation energy of 139 kJ mol-1 was determined for thermal decomposition.
Further data
| Item Type: | Conference item (Poster) |
|---|---|
| Refereed: | Yes |
| Institutions of the University: | Faculties > Faculty of Engineering Science Faculties > Faculty of Engineering Science > Chair Chemical Engineering Faculties > Faculty of Engineering Science > Chair Chemical Engineering > Chair Chemical Engineering - Univ.-Prof. Dr.-Ing. Andreas Jess Faculties |
| Result of work at the UBT: | Yes |
| DDC Subjects: | 500 Science > 540 Chemistry 600 Technology, medicine, applied sciences > 600 Technology 600 Technology, medicine, applied sciences > 620 Engineering 600 Technology, medicine, applied sciences > 660 Chemical engineering |
| Date Deposited: | 11 Feb 2016 08:43 |
| Last Modified: | 11 Feb 2016 08:43 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/30609 |