Development and validation of an analytical methodology for quantification of Al in alumina-based materials by 27Al Solid-state nmr

Abstract

In this work, a simple protocol for counting the Al spins present in diamagnetic materials used as carriers and catalysts based on 27Al solid-state nuclear magnetic resonance using routine 4 mm rotors was developed and validated. The acquisition parameters were optimized, and validation tests were performed using a standard sample of γ-alumina with a known aluminium concentration. The validation results indicated that solid-state NMR can be used for the quantification of quadrupolar aluminium (mmol Al.g-1 material) in diamagnetic materials by employing non-special tools with satisfactory results, similar to the NMR quantitative analysis of dipolar nuclei in solids.