In this report, experimental methods and calculation procedures are described for direct and simultaneous quantification of the Brønsted- and Lewis-acid site concentrations in a sample of USY zeolite. The concentrations of both types of add sites are characterized by solid-state 31P MAS NMR spectroscopy of trimethylphosphine oxide probe molecules. The errors associated with the area measurements in the NMR spectrum, and hence the errors in the concentration measurements reported, are estimated with Monte Carlo simulations applied with spectral line-fitting and deconvolution procedures.
All Science Journal Classification (ASJC) codes
- Physical and Theoretical Chemistry