Jump to main content
Jump to site search
PLANNED MAINTENANCE Close the message box

Scheduled maintenance work on Wednesday 22nd May 2019 from 11:00 AM to 1:00 PM (GMT).

During this time our website performance may be temporarily affected. We apologise for any inconvenience this might cause and thank you for your patience.



Fast method for determination of surface area on zeolites-based catalysts and zeolites using near infrared emission spectroscopy

Abstract

A new, fast and reagent free method for determination of surface area of zeolite-based catalysts and zeolites using direct spectral information of near infrared emission spectroscopy and chemometrics is described. Small samples amounts (approximately 3.0 mg) were heated at a fixed temperature (270 oC) and their emission spectra recorded using a prototype emission spectrometer with an acousto-optical tunable filter as wavelength selector. Emission spectra were correlated to the surface area determined by the reference Brunauer-Emmett-Teller (BET) method, using Partial Least Squares (PLS) regression models. Sixty-six samples of Y zeolite-based catalysts, ZSM-5 zeolite-based catalysts and Y and ZSM-5 zeolites were used to construct the models. A local model (including only catalysts) and a global model (including catalysts and zeolites) were developed with RMSEP of 24.7 and 22.3 m2g-1, respectively (which represents 9% and 8% of the median value, respectively) and precision (repeatability) of 26.0 m2g-1. The paired t-test at 95% confidence level demonstrated that the analytical results obtained by NIRES multivariate models are equivalent to measurements performed by BET method. The cost and speed were improved in comparison with the BET method. The method based on NIRES requires no sample preparation and speeds up the surface area analysis (4.5 min) about 370 times when compared with the BET method.

Back to tab navigation

Publication details

The article was received on 12 Mar 2019, accepted on 08 May 2019 and first published on 14 May 2019


Article type: Paper
DOI: 10.1039/C9AY00521H
Anal. Methods, 2019, Accepted Manuscript

  •   Request permissions

    Fast method for determination of surface area on zeolites-based catalysts and zeolites using near infrared emission spectroscopy

    J. P. Rebouças, J. J. Rodrigues Rohwedder and C. Pasquini, Anal. Methods, 2019, Accepted Manuscript , DOI: 10.1039/C9AY00521H

Search articles by author

Spotlight

Advertisements