Dataset for "Systematic approaches towards template-free synthesis of EMT-type zeolites"

Data collection method:

Powder X-ray diffraction data were collected using the Bruker D8-Advance X-ray powder diffractometer at the CCAF (Chemical Characterisation and Analysis Facility) at the University of Bath, using a Cu K(alpha) (1.5418 A) radiation source. Unit cell parameters were calculated using the program UnitCell by Holland and Redfern. Scanning electron microscope images were taken using the JEOL SEM6480LV microscope at the MAS (Microscopy Analysis Suite) at the University of Bath. Magic-angle solid state nuclear magnetic resonance spectroscopy (on 29-Si, 27-Al and 23-Na nuclei) were performed at the previously EPSRC-sponsored NMR service at Durham University. This was using a Varian VNMRS 400 spectrometer.

Data processing and preparation activities:

Within the relevant article, a parameter called the "omega value" is defined. This is used to qualitatively compare the crystallinity of the zeolite phases produced using a quick and simplistic method. To begin with, the first three Bragg peaks of the EMT frameworks were deconvoluted - these being the [100], [002] and [101] peaks. Upon deconvolution, the peaks were fitted to Gaussian curves, and the peak area consequently calculated. Next, the area of each Bragg peak was divided by the area of the equivalent peak in the zeolite sample prepared using the standard procedure, giving a peak area ratio. For each sample, an average of the ratio for each of the three peaks was taken, and dubbed the "omega value". As the standard procedure sample was compared to itself, it was reported as having an "omega value" of "1.0". An explanation of this calculation is also contained within the article.

Methodology link: