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- W2351711721 abstract "The catalytic activity of silica-alumina catalyst heavily depends on its acidic properties.The acidity of silica-alumina catalyst comes from Al atoms which have different oxygen coordination,but not from Si atoms.It is proposed that the type of acid center and acidic strength of silica-alumina catalyst are determined by coordination number of Al atom,i.e.the number of oxygen atoms coordinated with Al atom,which relates to the hybrid manner of Al atom outer orbital.13Al atom takes the outer orbital distribution of 3s23p1d0,which has three kinds of orbital hybrid,i.e.sp3,sp3d,and sp3d2.Four hybrid orbitals will be created if Al atom takes sp3 hybridization.Among the four sp3,three orbitals are unbonded,and the other is unoccupied.One Al atom can bond with two O atoms,forming [AlO2] a unit.There is a valence electron in the outer orbital of Al atom.At the same time,Al atom in [AlO2] unit still has an unoccupied orbital,which can accept electrons,so the [AlO2] is a two-coordination Lewis acid center.Meanwhile,one Al atom may bond with three O atoms,forming a [AlO3] unit.In [AlO3] unit,Al atom has an unoccupied orbital,so the [AlO3] unit is a three-coordination Lewis acid center.If one Al atom bonds with four O atoms and one H[AlO4] atom,forming a four-coordination unit H,which form is regular tetrahedron.Otherwise,Al atom can take sp3d hybridization,making the Al atom have three unbonded hybrid orbitals and two unoccupied orbitals,then one Al atom can bond with five O atoms and two H atoms,forming a five-coordination unit H2[AlO5],which form is tetragonal pyramid or trigonal bipyramid.Likely,through sp3d2 hybridization,six sp3d2 hybrid orbitals will be created around Al atom,among which three are unbonded orbitals and the other three are unoccupied orbitals.In this case,one Al atom can bond with six O atoms and three H atoms,forming a six-coordination unit H3[AlO6],which form is regular hexahedron.One H[AlO4] can provide one H+,being a four-coordination BrΦnsted acid center.Meanwhile,one H2[AlO5] can provide two H+,being a five-coordination BrΦnsted acid center,and H3[AlO6] can provide three H+,being a six-coordination BrΦnsted acid center." @default.
- W2351711721 created "2016-06-24" @default.
- W2351711721 creator A5030617408 @default.
- W2351711721 date "2011-01-01" @default.
- W2351711721 modified "2023-10-14" @default.
- W2351711721 title "Formation and Structural Characteristics of Acidic Centers of Silica-Alumina Catalyst" @default.
- W2351711721 hasPublicationYear "2011" @default.
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