| Hydrogen Production via the Glycerol Steam Reforming using Ce-La-xCu Catalysts pt.2 Ayesha Alkhoori1; Kyriaki Polychronopoulou1; 1KHALIFA UNIVERSITY, Abu Dhabi, United Arab Emirates; PAPER: 505/Energy/Regular (Oral) SCHEDULED: 16:20/Thu. 24 Oct. 2019/Coralino ABSTRACT: An unintended consequence of the drive towards replacing petro-based sources in the transport sector and the subsequent growth of the biodiesel industry is the co-production of large amounts of crude glycerol (C<sub>3</sub>H<sub>8</sub>O<sub>3</sub>) which constitutes the main by-product of the transesterification process [1-3]. A promising solution is its steam reforming since every mol of C<sub>3</sub>H<sub>8</sub>O<sub>3</sub> can theoretically produce 7 mol of H<sub>2</sub>. Thus, research efforts are directed towards the discovery of cheap (i.e., transition metal based), highly active and stable catalysts. In the work presented herein, a series of Ce-La-xCu, (x=3, 5, 7, 10, 20 at.%) catalysts were evaluated for the glycerol steam reforming reaction in the 400-750<sup>o</sup>C temperature range. Stability tests were conducted at 650<sup>o</sup>C for 12h. The catalysts were prepared by coupling microwave radiation with the sol-gel method and BET, XRD, Raman, NH<sub>3</sub>-TPD, CO<sub>2</sub>-TPD, H<sub>2</sub>-TPR, SEM, HAADF-STEM and XPS. These were used in order to derive information regarding their textural, morphological and physic-chemical properties to elucidate their effect on catalytic performance. The results obtained show that C<sub>3</sub>H<sub>8</sub>O<sub>3</sub> conversion of over 85% can be achieved with values for H<sub>2</sub> selectivity and approaches the yield of the thermodynamically predicted ones. The liquid effluents produced contained differing amounts of acetol, acetone, acetic acid, acrolein, allyl alcohol and acetaldehyde depending on the reaction temperature. Time-on-stream results, which were undertaken at more severe conditions, showed that all catalysts maintain quite a stable performance. References: [1] Papageridis, K.N.; Charisiou, N.D.; Siakavelas, G.; Avraam, D.G.; Tzounis, L.; Kousi, K.; Goula, M.A. Comparative study of Ni, Co, Cu supported on gamma-alumina catalysts for hydrogen production via the glycerol steam reforming reaction. Fuel Process. Technol. 2016, 152, 156-175.<br />[2] Bepari, S.; Pradhan, N.C.; Dalai, A.K. Selective production of hydrogen by steam reforming of glycerol over Ni/Fly ash catalyst. Catal. Today 2017, 291, 36-46.<br />[3] Goula, M.A.; Charisiou, N.D.; Pandis, P.K.; Stathopoulos, V.N. Ni/apatite-type lanthanum silicate supported catalyst for the glycerol steam reforming reaction. RSC Adv. 2016, 6, 78954-78958. |
