scholarly journals Flame Pyrolysis Synthesis of Mixed Oxides for Glycerol Steam Reforming

Materials ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 652
Author(s):  
Francesco Conte ◽  
Serena Esposito ◽  
Vladimiro Dal Santo ◽  
Alessandro Di Michele ◽  
Gianguido Ramis ◽  
...  
Keyword(s):  
Thermal Resistance ◽  
Spray Pyrolysis ◽  
Steam Reforming ◽  
Mixed Oxides ◽  
Surface Acidity ◽  
Coke Formation ◽  
Flame Spray Pyrolysis ◽  
Flame Spray ◽  
Base Materials ◽  
High Temperature Synthesis

Flame spray pyrolysis was used to produce nanosized Ni-based catalysts starting from different mixed oxides. LaNiO3 and CeNiO3 were used as base materials and the formulation was varied by mixing them or incorporating variable amounts of ZrO2 or SrO during the synthesis. The catalysts were tested for the steam reforming of glycerol. One of the key problems for this application is the resistance to deactivation by sintering and coking, which may be increased by (1) improving Ni dispersion through the production of a Ni-La or Ni-Ce mixed oxide precursor, and then reduced; (2) using an oxide as ZrO2, which established a strong interaction with Ni and possesses high thermal resistance; (3) decreasing the surface acidity of ZrO2 through a basic promoter/support, such as La2O3; and (4) adding a promoter/support with very high oxygen mobility such as CeO2. A further key feature is the use of a high temperature synthesis, such as flame spray pyrolysis, to improve the overall thermal resistance of the oxides. These strategies proved effective to obtain active and stable catalysts at least for 20 h on stream with very limited coke formation.

Flame-Made CuO/ZnO/Al2O3 Catalyst for Methanol Steam Reforming

2013 ◽  
Author(s):  
Emmanuel Lim ◽  
Teeravit Visutipol ◽  
Wen Peng ◽  
Nico Hotz
Keyword(s):  
Carbon Monoxide ◽  
Spray Pyrolysis ◽  
Steam Reforming ◽  
Methanol Conversion ◽  
Flame Spray Pyrolysis ◽  
Spray Pyrolysis Method ◽  
Methanol Steam Reforming ◽  
Flame Spray ◽  
Inlet Flow ◽  
Flow Rates

In the present study, a catalyst produced by flame spray pyrolysis (FSP) was evaluated for its ability to produce hydrogen-rich gas mixtures. Catalyst particles fabricated by a novel flame spray pyrolysis method resulting in a highly active catalyst with high surface-to-volume ratio were compared to a commercially produced catalyst (BASF F3-01). Both catalysts consisted of CuO/ZnO/Al2O3 of identical composition (CuO 40wt%, ZnO 40wt%, Al2O3 20wt%). Reaction temperatures between 220 and 295 °C, methanol-water inlet flow rates between 2 and 50 μl/min, and reactor masses between 25 and 100 mg were tested for their effect on methanol conversion and the production of undesired carbon monoxide. 100% methanol conversion can be easily achieved within the operational conditions mentioned for this flame-made catalyst — at reactor temperatures of 255 °C (achievable with non-concentrating solar collectors) more than 80% methanol conversion can be reached for methanol-water inlet flow rates as high as 10 μl/min. The FSP catalyst demonstrates similar catalytic abilities as the BASF, produces a consistent gas composition and produces lower overall CO production. Furthermore, the FSP catalyst demonstrates a better suitability to fuel cell use through its higher resistance to degradation and smaller production of carbon monoxide over long-term use. In the present study, the merits of using flame spray pyrolysis to produce CuO/ZnO/Al2O3 methanol steam reforming catalysts are examined, and directly compared to catalysts that are commercially produced in bulk pellet form, and then ground and sieved. The comparison is performed from several different perspectives: catalytic activity and CO production at various temperatures and fuel inlet flow rates; surface and structure characteristics are determined via scanning electron and transmission electron microscopy; surface area characteristics are determined via BET tests.

Flame-Made Catalyst for Bio-Methanol Steam Reforming

2013 ◽  
Author(s):  
Nico Hotz
Keyword(s):  
Carbon Monoxide ◽  
Spray Pyrolysis ◽  
Steam Reforming ◽  
Methanol Conversion ◽  
Flame Spray Pyrolysis ◽  
Spray Pyrolysis Method ◽  
Methanol Steam Reforming ◽  
Flame Spray ◽  
Inlet Flow ◽  
Flow Rates

In the present study, a catalyst produced by flame spray pyrolysis (FSP) was evaluated for its ability to produce hydrogen-rich gas mixtures. Catalyst particles fabricated by a novel flame spray pyrolysis method resulting in a highly active catalyst with high surface-to-volume ratio were compared to a commercially produced catalyst (BASF F3-01). Both catalysts consisted of CuO/ZnO/Al2O3 of identical composition (CuO 40wt%, ZnO 40wt%, Al2O3 20wt%). Reaction temperatures between 220 and 295 °C, methanol-water inlet flow rates between 2 and 50 μl/min, and reactor masses between 25 and 100 mg were tested for their effect on methanol conversion and the production of undesired carbon monoxide. 100% methanol conversion can be easily achieved within the operational conditions mentioned for this flame-made catalyst — at reactor temperatures of 255 °C (achievable with non-concentrating solar collectors) more than 80% methanol conversion can be reached for methanol-water inlet flow rates as high as 10 μl/min. The FSP catalyst demonstrates similar catalytic abilities as the BASF, produces a consistent gas composition and produces lower overall CO production. Furthermore, the FSP catalyst demonstrates a better suitability to fuel cell use through its higher resistance to degradation and smaller production of carbon monoxide over long-term use. In the present study, the merits of using flame spray pyrolysis to produce CuO/ZnO/Al2O3 methanol steam reforming catalysts are examined, and directly compared to catalysts that are commercially produced in bulk pellet form, and then ground and sieved. The comparison is performed from several different perspectives: catalytic activity and CO production at various temperatures and fuel inlet flow rates; surface and structure characteristics are determined via scanning electron and transmission electron microscopy; surface area characteristics are determined via Brunauer-Emmett-Teller (BET) tests.

CuAl2O4–CuO–Al2O3 catalysts prepared by flame-spray pyrolysis for glycerol hydrogenolysis

2021 ◽  
pp. 111426
Author(s):  
Naphaphan Kunthakudee ◽  
Pongtanawat Khemthong ◽  
Chuleeporn Luadthong ◽  
Joongjai Panpranot ◽  
Okorn Mekasuwandumrong ◽  
...  
Keyword(s):  
Spray Pyrolysis ◽  
Flame Spray Pyrolysis ◽  
Flame Spray ◽  
Glycerol Hydrogenolysis

Ultrafast Synthesis of High Entropy Oxide Nanoparticles by Flame Spray Pyrolysis

Langmuir ◽  
2021 ◽  
Author(s):  
Abhijit H. Phakatkar ◽  
Mahmoud Tamadoni Saray ◽  
Md Golam Rasul ◽  
Lioudmila V. Sorokina ◽  
Timothy G. Ritter ◽  
...  
Keyword(s):  
Spray Pyrolysis ◽  
Flame Spray Pyrolysis ◽  
Oxide Nanoparticles ◽  
Flame Spray ◽  
High Entropy

scholarly journals Double-Nozzle Flame Spray Pyrolysis as a Potent Technology to Engineer Noble Metal-TiO2 Nanophotocatalysts for Efficient H2 Production

Energies ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 817
Author(s):  
Maria Solakidou ◽  
Yiannis Georgiou ◽  
Yiannis Deligiannakis
Keyword(s):  
Spray Pyrolysis ◽  
Noble Metal ◽  
H2 Production ◽  
Flame Spray Pyrolysis ◽  
Flame Spray ◽  
Scale Production ◽  
Efficient Technology ◽  
Tio2 Photocatalysts ◽  
Surface Dispersion ◽  
Tio2 Matrix

Noble metal-TiO2 nanohybrids, NM0-TiO2, (NM0 = Pt0, Pd0, Au0, Ag0) have been engineered by One-Nozzle Flame Spray Pyrolysis (ON-FSP) and Double-Nozzle Flame Spray Pyrolysis (DN-FSP), by controlling the method of noble metal deposition to the TiO2 matrix. A comparative screening of the two FSP methods was realized, using the NM0-TiO2 photocatalysts for H2 production from H2O/methanol. The results show that the DN-FSP process allows engineering of more efficient NM0-TiO2 nanophotocatalysts. This is attributed to the better surface-dispersion and narrower size-distribution of the noble metal onto the TiO2 matrix. In addition, DN-FSP process promoted the formation of intraband states in NM0-TiO2, lowering the band-gap of the nanophotocatalysts. Thus, the present study demonstrates that DN-FSP process is a highly efficient technology for fine engineering of photocatalysts, which adds up to the inherent scalability of Flame Spray Pyrolysis towards industrial-scale production of nanophotocatalysts.

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