Renewable H2 from glycerol steam reforming: effect of La2O3 and CeO2 addition to Pt/Al2O3 catalysts.
Glycerol is the main byproduct of biodiesel production and its increased production volume derives from the increasing demand for biofuels. The conversion of glycerol to hydrogen-rich mixtures presents an attractive route towards sustainable biodiesel production. Here we explored the use of Pt/Al(2)O(3)-based catalysts for the catalytic steam reforming of glycerol, evidencing the influence of La(2)O(3) and CeO(2) doping on the catalyst activity and selectivity. The addition of the latter metal oxides to a Pt/Al(2)O(3) catalyst is found to significantly improve the glycerol steam reforming, with high H(2) and CO(2) selectivities. A good catalytic stability is achieved for the Pt/La(2)O(3)/Al(2)O(3) system working at 350 degrees C, while the Pt/CeO(2)/Al(2)O(3) catalyst sharply deactivates after 20 h under similar conditions. Studies carried out on fresh and exhausted catalysts reveal that both systems maintain high surface areas and high Pt dispersions. Therefore, the observed catalyst deactivation can be attributed to coke deposition on the active sites throughout the catalytic process and only marginally to Pt nanoparticle sintering. This work suggests that an appropriate support composition is mandatory for preparing high-performance Pt-based catalysts for the sustainable conversion of glycerol into syngas.
Montini
Tiziano
T
Department of Chemical Sciences, ICCOM-CNR Research Unit, University of Trieste via L. Giorgieri 1, 34127 Trieste, Italy.
Singh
Rakesh
R
Das
Piyali
P
Lorenzut
Barbara
B
Bertero
Nicolás
N
Riello
Pietro
P
Benedetti
Alvise
A
Giambastiani
Giuliano
G
Bianchini
Claudio
C
Zinoviev
Sergey
S
Miertus
Stanislav
S
Fornasiero
Paolo
P
D000537:Aluminum Oxide / Q000737:chemistry*; D002245:Carbon Dioxide / Q000737:chemistry; D002384:Catalysis; D002563:Cerium / Q000737:chemistry*; D005990:Glycerol / Q000737:chemistry*; D006859:Hydrogen / Q000737:chemistry*; D007811:Lanthanum / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry; D010087:Oxides / Q000737:chemistry*; D010984:Platinum / Q000737:chemistry*; D013227:Steam; D014961:X-Ray Diffraction
D010087:Oxides; D013227:Steam; D002245:Carbon Dioxide; D002563:Cerium; D010984:Platinum; C103829:lanthanum oxide; C030583:ceric oxide; D007811:Lanthanum; D006859:Hydrogen; D000537:Aluminum Oxide; D005990:Glycerol