Waste-free scale up synthesis of nanocrystalline hexaaluminate: properties in oxygen transfer and oxidation reactions

Laassiri, Said; Bion, Nicolas; Can, Fabien; Courtois, Xavier; Duprez, Daniel; Royer, Sébastien; Alamdari, Houshang

doi:10.1039/c2ce25737h

Cited by 13 publications

(24 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The impact of the two steps of grinding over α‐MnO 2 structure is comparable to results obtained over perovskites and hexaaluminates . For these two kinds of material, the reduction of crystal size occurred during the HEBM step, and only surface area was enhanced during LEBM step.…”

Section: Resultssupporting

confidence: 68%

“…The approach, in its principle, is considered as sustainable since no solvent is used during the whole production process, and abundant and cheap inorganic precursor can be used for final material production . A two steps grinding process has been developed, based on our experience for the preparation of perovskite and hexaaluminate, to produce a nanocrystalline α‐MnO 2 material, starting from commercial sample. The study illustrates the potential of the two‐step ARS to modify material morphology, producing a material with adequate properties for low temperature oxidation reaction.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Simple and Green Procedure to Prepare Efficient Manganese Oxide Nanopowder for the Low Temperature Removal of Formaldehyde

et al. 2017

Self Cite

View full text Add to dashboard Cite

Activated reactive synthesis, as a top‐down synthesis approach, is proposed for the production of a nanocrystalline, high surface area, manganese (IV) oxide starting from commercial micrometric α‐MnO2. The developed approach consists of two‐steps: 1) high energy ball milling (HEBM) produces a nano‐sized material, 2) low energy ball milling (LEBM) improves textural properties. During the HEBM step, elementary crystals are observed to evolve from several hundred elongated cylindrical particles to short length cylinders and pseudo spherical particles. Despite fractioning of the elementary crystals, surface area remains low over the HEBM derived solid. The LEBM step, achieves crystal shape modification, giving rise to only pseudo‐spherical nanometric particles and significantly increasing the surface area to approximately 60–80 m2 g−1. Catalytic activity of α‐MnO2 powder is affected by the grinding process. Activity is similar to the fresh commercial MnO2 after HEBM, and increases upon LEBM reaching a maximum for LEBM time of 1 h. Thereafter, activity remains constant despite the further increase in surface area upon prolonged LEBM. The presence of an optimal activity after limited LEBM time is paralleled with the increase of the iron contamination occurring after prolonged LEBM time which impacts manganese reducibility and results in less reactive surface.

show abstract

Section: Resultssupporting

confidence: 68%

Section: Introductionmentioning

confidence: 99%

A Simple and Green Procedure to Prepare Efficient Manganese Oxide Nanopowder for the Low Temperature Removal of Formaldehyde

et al. 2017

Self Cite

View full text Add to dashboard Cite

show abstract

“…9 A promising synthesis route, recently reported for the preparation of MOs, is to use the ''Activated Reactive Synthesis'' ARS process. 11,12 The synthesis approach is based on the restructuring of a pre-crystallized MO via reactive grinding process to generate nanostructured materials with high surface area. The increase in the surface area occurring during the ARS process was reported to greatly enhance the catalytic activity of the hexaaluminate catalyst.…”

Section: Introductionmentioning

confidence: 99%

Clear microstructure–performance relationships in Mn-containing perovskite and hexaaluminate compounds prepared by activated reactive synthesis

Laassiri¹,

Bion²,

Duprez³

et al. 2014

Phys. Chem. Chem. Phys.

Self Cite

View full text Add to dashboard Cite

Microstructural properties of mixed oxides play essential roles in their oxygen mobility and consequently in their catalytic performances. Two families of mixed oxides (perovskite and hexaaluminate) with different microstructural features, such as crystal size and specific surface area, were prepared using the activated reactive synthesis (ARS) method. It was shown that ARS is a flexible route to synthesize both mixed oxides with nano-scale crystal size and high specific surface area. Redox properties and oxygen mobility were found to be strongly affected by the material microstructure. Catalytic activities of hexaaluminate and perovskite materials for methane oxidation were discussed in the light of structural, redox and oxygen mobility properties.

show abstract

“…These BHA materials display excellent methane combustion activity and stability after being coated with 10 wt% CeO 2 . 12,13 However, solid-state reaction needs a very high temperature, even more than 1500 uC, and proceeds slowly. 10 These BHA materials showed a high surface area of y90 m 2 g 21 even after calcination at 1300 uC.…”

Section: Introductionmentioning

confidence: 99%

Template preparation of high-surface-area barium hexaaluminate as nickel catalyst support for improved CO methanation

et al. 2013

View full text Add to dashboard Cite

We report the simple preparation of the barium hexaaluminate (BaO?6Al 2 O 3 , BHA) with high surface area (BHA-HSA) (>100 m 2 g 21 ) through a coprecipitation method using carbon black as the hard template. Ni catalysts supported on BHA-HSA (Ni/BHA-HSA) with different NiO loadings (10, 20, and 40 wt%) were investigated in CO methanation for the production of synthetic natural gas (SNG). The CO methanation reaction was carried out at 0.1 and 3.0 MPa with a weight hourly space velocity of 30 000 mL g 21 h 21 . It was found that Ni/BHA-HSA catalysts showed increased activity at low temperature (240-400 uC) compared with more conventional Ni/BHA catalysts with the same NiO loadings. A highest CH 4 yield of 95.7% can be obtained over Ni/BHA-HSA (40 wt% of NiO loading) at 400 uC and 3.0 MPa, and a lifetime test shows that, at 500 uC and 3.0 MPa, it is more stable than Ni/BHA. The serious aggregation of Ni nanoparticles is the major reason for the deactivation of the latter. The work demonstrates that BHA-HSA can be effectively prepared using carbon black as the hard template and is more suitable as a Ni catalyst support for CO methanation.

show abstract

Waste-free scale up synthesis of nanocrystalline hexaaluminate: properties in oxygen transfer and oxidation reactions

Cited by 13 publications

References 44 publications

A Simple and Green Procedure to Prepare Efficient Manganese Oxide Nanopowder for the Low Temperature Removal of Formaldehyde

A Simple and Green Procedure to Prepare Efficient Manganese Oxide Nanopowder for the Low Temperature Removal of Formaldehyde

Clear microstructure–performance relationships in Mn-containing perovskite and hexaaluminate compounds prepared by activated reactive synthesis

Template preparation of high-surface-area barium hexaaluminate as nickel catalyst support for improved CO methanation

Contact Info

Product

Resources

About