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Efficient catalysts for achieving NO /NO2 equilibrium

Lid, Mads Alexander
Master thesis
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URI
http://hdl.handle.net/11250/2416087
Date
2016
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  • Institutt for kjemisk prosessteknologi [1206]
Abstract
The aim of this work was to characterize an alumina supported Pt catalyst

before and after post- and pre-modification with WO3. A 2wt%Ru/Al2O3

and a WO3/ZrO2 catalyst were also characterized.

Pt/Al2O3 with a loading of 1wt%Pt was prepared by one step aqueous incipient

wetness impregnation. Post and pre-modified 1wt%Pt-1.3wt%WO3 catalyst

was prepared by two step aqueous incipient wetness impregnation. In this work,

characterization by N2 adsorption, H2 and CO chemisorption, X-ray

fluorescence (XRD), Scanning electron microscopy (SEM), energy-dispersive X-ray

analysis (EDS), X-ray diffraction (XRD), temperature programmed reduction (TPR),

Fourier transform infra-red Attenuated Total Reflectance (FTIR-ATR) and in-situ

Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS) with

pyridine adsorption were performed.

Nitrogen adsorption showed that the addition of platinum and tungsten oxide did

not alter the surface area, pore size or pore volume of the support.

Chemisorption showed a good dispersion of platina on alumina, but this

decreased slightly when modified by WO3, indicating blockage of active

sites. XRF measurements shows a metal loading of 1.2wt\%Pt for unmodified

catalyst, and 0.8wt%Pt and 0.7%wtWO3 for both post- and pre-modified

catalyst. No reliable results were obtained from TPR, which could mean that

platinum was already in its elemental state. Due to the low Pt and WO3

content and highly amorphous alumina, assignment of phase type or calculation

of crystallite size with XRD was not feasible. Ex-situ investigation with ATR

did not detect changes in the surface structure after addition of Pt and WO3.

DRIFT investigations shows that band associated with strong and medium Lewis

acid sites are barely present in Pt/Al2O3 catalyst. By contrast, these

bands increased in intensity for post- and pre-modified catalyst. This

indicates increased acidity of the alumina after WO3 addition.

These results will later be used in the investigation of a suitable catalyst

for the current non-catalytic NO oxidation step in nitric acid production.
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NTNU

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