Surface alumina species on modified titanium dioxide: A solid-state 27Al MAS and 3QMAS NMR investigation of catalyst supports

Edward W. Hagaman; Jian Jiao; Banghao Chen; Zhen Ma; Hongfeng Yin; Sheng Dai

doi:10.1016/j.ssnmr.2010.05.003

Surface alumina species on modified titanium dioxide: A solid-state ²⁷Al MAS and 3QMAS NMR investigation of catalyst supports

Edward W. Hagaman
, Jian Jiao
, Banghao Chen
, Zhen Ma
, Hongfeng Yin
, Sheng Dai

Chemical Sciences Division

Research output: Contribution to journal › Article › peer-review

16 Scopus citations

Abstract

²⁷Al MAS and 3QMAS NMR have been used to study Al ₂O₃/TiO₂ catalyst supports synthesized via excess-solution impregnation and surface solgel methods. Temperature and alumina loading level strongly affect chemical states of aluminum oxide species observed. Surface cations, Al(H2O)63, a surface alumina monolayer, and disordered transitional aluminas (multilayers) and α-alumina, coexist on the TiO₂ surface. Chemical shift and quadrupole coupling constants are reported for the major species identified in 3QMAS experiments. Gold particle catalysts prepared from supports calcined at 500 °C have optimum catalytic activity in CO oxidation, and smallest gold particle size for supports, which show maximum monolayer type octahedral alumina on the titania surface.

Original language	English
Pages (from-to)	82-90
Number of pages	9
Journal	Solid State Nuclear Magnetic Resonance
Volume	37
Issue number	3-4
DOIs	https://doi.org/10.1016/j.ssnmr.2010.05.003
State	Published - May 2010

Funding

Research sponsored by the Division of Chemical Sciences, Geosciences, and Biosciences, Office of Basic Energy Sciences, US Department of Energy.

Keywords

Al MAS NMR: Al 3QMAS NMR
Alumina-modified titania
Aluminum speciation
Catalyst supports
Chemical shifts
Quadrupole coupling constants

Access to Document

10.1016/j.ssnmr.2010.05.003

Cite this

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title = "Surface alumina species on modified titanium dioxide: A solid-state 27Al MAS and 3QMAS NMR investigation of catalyst supports",

abstract = "27Al MAS and 3QMAS NMR have been used to study Al 2O3/TiO2 catalyst supports synthesized via excess-solution impregnation and surface solgel methods. Temperature and alumina loading level strongly affect chemical states of aluminum oxide species observed. Surface cations, Al(H2O)63, a surface alumina monolayer, and disordered transitional aluminas (multilayers) and α-alumina, coexist on the TiO2 surface. Chemical shift and quadrupole coupling constants are reported for the major species identified in 3QMAS experiments. Gold particle catalysts prepared from supports calcined at 500 °C have optimum catalytic activity in CO oxidation, and smallest gold particle size for supports, which show maximum monolayer type octahedral alumina on the titania surface.",

keywords = "Al MAS NMR: Al 3QMAS NMR, Alumina-modified titania, Aluminum speciation, Catalyst supports, Chemical shifts, Quadrupole coupling constants",

author = "Hagaman, \{Edward W.\} and Jian Jiao and Banghao Chen and Zhen Ma and Hongfeng Yin and Sheng Dai",

year = "2010",

month = may,

doi = "10.1016/j.ssnmr.2010.05.003",

language = "English",

volume = "37",

pages = "82--90",

journal = "Solid State Nuclear Magnetic Resonance",

issn = "0926-2040",

publisher = "Elsevier",

number = "3-4",

}

TY - JOUR

T1 - Surface alumina species on modified titanium dioxide

T2 - A solid-state 27Al MAS and 3QMAS NMR investigation of catalyst supports

AU - Hagaman, Edward W.

AU - Jiao, Jian

AU - Chen, Banghao

AU - Ma, Zhen

AU - Yin, Hongfeng

AU - Dai, Sheng

PY - 2010/5

Y1 - 2010/5

N2 - 27Al MAS and 3QMAS NMR have been used to study Al 2O3/TiO2 catalyst supports synthesized via excess-solution impregnation and surface solgel methods. Temperature and alumina loading level strongly affect chemical states of aluminum oxide species observed. Surface cations, Al(H2O)63, a surface alumina monolayer, and disordered transitional aluminas (multilayers) and α-alumina, coexist on the TiO2 surface. Chemical shift and quadrupole coupling constants are reported for the major species identified in 3QMAS experiments. Gold particle catalysts prepared from supports calcined at 500 °C have optimum catalytic activity in CO oxidation, and smallest gold particle size for supports, which show maximum monolayer type octahedral alumina on the titania surface.

AB - 27Al MAS and 3QMAS NMR have been used to study Al 2O3/TiO2 catalyst supports synthesized via excess-solution impregnation and surface solgel methods. Temperature and alumina loading level strongly affect chemical states of aluminum oxide species observed. Surface cations, Al(H2O)63, a surface alumina monolayer, and disordered transitional aluminas (multilayers) and α-alumina, coexist on the TiO2 surface. Chemical shift and quadrupole coupling constants are reported for the major species identified in 3QMAS experiments. Gold particle catalysts prepared from supports calcined at 500 °C have optimum catalytic activity in CO oxidation, and smallest gold particle size for supports, which show maximum monolayer type octahedral alumina on the titania surface.

KW - Al MAS NMR: Al 3QMAS NMR

KW - Alumina-modified titania

KW - Aluminum speciation

KW - Catalyst supports

KW - Chemical shifts

KW - Quadrupole coupling constants

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U2 - 10.1016/j.ssnmr.2010.05.003

DO - 10.1016/j.ssnmr.2010.05.003

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JO - Solid State Nuclear Magnetic Resonance

JF - Solid State Nuclear Magnetic Resonance

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