A Comparison Between Low and High Temperature Bi2O3MoO3 Phases FOR 1-Butene Reactions

Portela, H. Farinha; Pinheiro, Carla; Dias, Cristina R.; Pires, Maria João

doi:10.1016/s0167-2991(08)61928-x

Cited by 5 publications

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“…Bismuth molybdates have been largely studied because of their interesting catalytic properties in selective olefin oxidation and ammonoxidation processes. , Perhaps Bi 2 MoO 6 is one of the most complex compounds belonging to this system, because it crystallizes in four polymorphic phases, that can be isolated at increasing temperatures depending on the synthesis protocol, with each of them exhibiting different applications as ionic conductor, ferroelectric material, and also catalyst , The γ(L) phase is easily obtained by the traditional ceramic route, at moderate temperatures, remaining stable up to 600 °C, when a reversible γ(L)↔γ(I) transition occurs.…”

Section: Introductionmentioning

confidence: 99%

New Bi₂Mo₁_-_xW_xO₆ Solid Solution: Mechanosynthesis, Structural Study, and Ferroelectric Properties of the x = 0.75 Member

et al. 2003

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To search for new ferroelectric materials exhibiting an Aurivillius structural type, the syntheses of the solid solution Bi 2 Mo 1-x W x O 6 has been undertaken. A phase with a large homogeneity range exists for 0.5 < x e 1.0. The thermal behavior of mechanochemically assisted precursor powders has been studied, showing that the consecutive crystallization of fluorite and Aurivillius-type phases arrives before a ferro-paraelectric transition occurs. TEM studies of the representative mechanoactivated 1:0.25:0.75 Bi 2 O 3 :MoO 3 :WO 3 mixture indicates that mechanosynthesis of a Bi 2 Mo 0.25 W 0.75 O 6 amorphous phase takes place. The ferroelectric properties of Bi 2 Mo 0.25 W 0.75 O 6 well-densified ceramic material have been measured. The crystal structure of Bi 2 Mo 0.25 W 0.75 O 6 has been refined using X-ray and neutron powder diffraction combined with Rietveld analysis. This oxide is isostructural with both γ(L) Bi 2 MoO 6 and Bi 2 WO 6 belonging to the orthorhombic system, space group Pca2 1 , a ) 5.44547( 7) Å, b ) 16.3731(2) Å, and c ) 5.46659(7) Å, V ) 487.40(1) Å 3 , Z ) 4, and F cal ) 9.21 g‚cm -3 . The structure keeps the Aurivillius-type framework with alternating [Bi 2 O 2 ] and [Mo/WO 4 ] layers. The structural characteristics of Bi 2 Mo 0.25 W 0.75 O 6 can be considered intermediate between those of γ(L) Bi 2 MoO 6 and Bi 2 WO 6 .

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Section: Introductionmentioning

confidence: 99%

New Bi₂Mo₁_-_xW_xO₆ Solid Solution: Mechanosynthesis, Structural Study, and Ferroelectric Properties of the x = 0.75 Member

et al. 2003

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The Upper Limit of the Solid Solution Bi2−x SbxMoO6: Structure Refinement of Bi1.1Sb0.9MoO6

Begue

Enjalbert

Castro

2001

Journal of Solid State Chemistry

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Mixed valence oxide ((Sb,As)2O)Mo45+Mo66+O30: synthesis, crystal structure and physical properties

Iglesias

Castro

Enjalbert

et al. 2004

Solid State Sciences

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A Comparison Between Low and High Temperature Bi2O3MoO3 Phases FOR 1-Butene Reactions

Cited by 5 publications

References 1 publication

New Bi₂Mo₁_-_xW_xO₆ Solid Solution: Mechanosynthesis, Structural Study, and Ferroelectric Properties of the x = 0.75 Member

New Bi₂Mo₁_-_xW_xO₆ Solid Solution: Mechanosynthesis, Structural Study, and Ferroelectric Properties of the x = 0.75 Member

The Upper Limit of the Solid Solution Bi2−x SbxMoO6: Structure Refinement of Bi1.1Sb0.9MoO6

Mixed valence oxide ((Sb,As)2O)Mo45+Mo66+O30: synthesis, crystal structure and physical properties

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A Comparison Between Low and High Temperature Bi2O3MoO3 Phases FOR 1-Butene Reactions

Cited by 5 publications

References 1 publication

New Bi2Mo1-xWxO6 Solid Solution: Mechanosynthesis, Structural Study, and Ferroelectric Properties of the x = 0.75 Member

New Bi2Mo1-xWxO6 Solid Solution: Mechanosynthesis, Structural Study, and Ferroelectric Properties of the x = 0.75 Member

The Upper Limit of the Solid Solution Bi2−x SbxMoO6: Structure Refinement of Bi1.1Sb0.9MoO6

Mixed valence oxide ((Sb,As)2O)Mo45+Mo66+O30: synthesis, crystal structure and physical properties

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Product

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New Bi₂Mo₁_-_xW_xO₆ Solid Solution: Mechanosynthesis, Structural Study, and Ferroelectric Properties of the x = 0.75 Member

New Bi₂Mo₁_-_xW_xO₆ Solid Solution: Mechanosynthesis, Structural Study, and Ferroelectric Properties of the x = 0.75 Member