Tailoring amorphous alumina catalysts with enriched five-coordinated aluminum via pH control

Key Points

• The aim is to optimize amorphous alumina catalysts by enriching five-coordinated aluminum through pH control.
• Utilized pH control to tailor the composition of amorphous alumina catalysts.
• Conducted deconvolution of 27 Al NMR spectra to analyze aluminum coordination.
• Characterized catalytic activity related to different aluminum coordination states.
• Identified two components of five-coordinated aluminum: trigonal bipyramidal and square pyramidal.
• Square pyramidal aluminum exhibits strong Lewis acidity and enhances catalytic performance.
• Demonstrated improvement in catalytic activity through optimized aluminum coordination.