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The Surface Chemistry of Metallurgical Aluminas by Grant J. McIntosh; James B. Metson; Margaret M. Hyland is a Engineering article available to read on EtoBox.

What is The Surface Chemistry of Metallurgical Aluminas about?

We have studied the evolution of surface basicity as a function of calcination temperature in a range of transition alumina‐rich analogues of metallurgical grade aluminas produced by calcination of Bayer gibbsite. Specific basicity, the number of basic sites per unit surface area, was determined by thermometric back‐titration and found to increase with calcination temperature up to ~700°C to 800°C, decreasing dramatically thereafter. The population of tetrahedrally coordinated Al^3+^, which exhibits a qualitatively similar evolution, was determined by Al __K__‐edge near‐edge X‐ray absorption fine structure (NEXAFS) spectroscopy but found not to correlate with basicity changes. Interestingly, a shift to higher and then lower binding energy of Al 2__p__ photoelectrons by X‐ray photoelectron spectroscopy and changes in the intensity of O __K__‐edge NEXAFS spectra do appear to correlate with surface basicity. Exploiting the differing surface sensitivities of NEXAFS spectra collected in partial electron and total fluorescence yield modes, we find O __K__‐edge spectra intensities, Al 2__p__ X‐ray photoelectron spectrometer binding energies, and surface basicity all reflect the reorganisa

Who reads The Surface Chemistry of Metallurgical Aluminas?

Author

Grant J. McIntosh; James B. Metson; Margaret M. Hyland

Publisher

Wiley

Published

2017

Language

EN

Field

Engineering (Physical Sciences)