De-SO sub x catalyst; An XRD study of magnesium aluminate spinel and its solid solutions

Journal Article · Mon Jul 01 00:00:00 EDT 1991 · Industrial and Engineering Chemistry Research; (United States)

DOI:https://doi.org/10.1021/ie00055a007· OSTI ID:5877267

Yoo, J S; Bhattacharyya, A A; Radlowski, C A ^[1]

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1. Amoco Chemical Co., Naperville, IL (United States). Research and Development Dept.

This paper reports on a systematic X-ray diffraction study that was undertaken to characterize the stoichiometric spinel (MgAl{sub 2}O{sub 4}), alumina excess spinel (MgAl{sub 2}O{sub 4} {center dot} xAl{sub 2}O{sub 3}) and magnesia excess spinel (MgAl{sub 2}O{sub 4} {center dot} MgO). A Vegard's plot, lattice parameter vs the composition of these solid solutions, reveals that, in alumina excess spinel, a continuous solid solution (x = 0 {minus} {infinity}) exists, while, in magnesia excess material, the solid solution is limited to y = 0-1. When y = 1, a solid solution assumes the composition of MgAl{sub 2}O{sub 4} {center dot} MgO. If y {gt} 1, both periclase and stoichiometric spinel (MgAl{sub 2}O{sub 4}) phases coexist. The SO{sub x} removal activity of various hydrothermally stable cerium oxide containing solid solution spinels was evaluated. In the magnesia excess solid solutions, SO{sub x} removal activity increased as MgO increased and reached maximum at y = 1, which is the CeO{sub 2}/MgAl{sub 2}O{sub 4} {center dot} MgO system. This catalyst is the most widely used SO{sub x} reduction catalyst today.

• OSTI ID: 5877267
• Journal Information: Industrial and Engineering Chemistry Research; (United States), Vol. 30:7; ISSN 0888-5885
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ALUMINIUM OXIDES
X-RAY DIFFRACTION
MAGNESIUM OXIDES
SOLID SOLUTIONS
CATALYSTS
CHEMICAL COMPOSITION
LATTICE PARAMETERS
PHASE STUDIES
REDUCTION
SPINELS
STOICHIOMETRY
SULFUR OXIDES
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
COHERENT SCATTERING
DIFFRACTION
DISPERSIONS
MAGNESIUM COMPOUNDS
MINERALS
MIXTURES
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
SCATTERING
SOLUTIONS
SULFUR COMPOUNDS
360202* - Ceramics
Cermets
& Refractories- Structure & Phase Studies
400201 - Chemical & Physicochemical Properties