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Orientational analysis of adsorbates in molecular sieves by FTIR/ATR spectroscopy
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Industriell miljö- och processteknik.ORCID-id: 0000-0002-4755-5754
Luleå tekniska universitet.
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Industriell miljö- och processteknik.ORCID-id: 0000-0001-9794-8305
Luleå tekniska universitet.ORCID-id: 0000-0003-1053-4623
2008 (engelsk)Inngår i: Chemistry of Materials, ISSN 0897-4756, E-ISSN 1520-5002, Vol. 20, nr 19, s. 6270-6276Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

ZnS ATR elements were coated with well-defined b-oriented ZSM-5 films by in situ growth. Both adsorption isotherms, as well as molecular orientation of p-xylene adsorbed in the films, were measured at 323 and 373 K by FTIR/ATR spectroscopy. The observed isotherms for the b-oriented ZSM-5 films in the present work were very similar to previously reported isotherms of supported MFI films, albeit the crystals in the latter films were aluminum free (silicalite-1) and orientated differently relative to the support surface than the crystals in the films studied in the present work. The novel technique facilitated, for the first time, the examination of how the tilt angle varies with loading and temperature. The data obtained in the present work showed that the p-xylene molecules were mainly oriented with their long axis parallel to the b-direction of the MFI crystals in concert with previously reported results based on FTIR microscopy, Monte Carlo simulations, NMR, and XRD data. At high concentrations, the tilt angle was in good agreement with observations by FTIR microscopy. It was also found that the orientation of the molecules changed with loading, this might be due to different adsorption geometries in the channel intersection as reported previously. The observed tilt angles may also be influenced from competitive adsorption on silanol groups, as was also indicated in the spectra. The results also indicate that the adsorption properties of zeolite films and powders may differ. Hence, adsorption parameters determined for zeolite powders may not necessarily be applicable to films.

sted, utgiver, år, opplag, sider
2008. Vol. 20, nr 19, s. 6270-6276
HSV kategori
Forskningsprogram
Kemisk teknologi; Fysikalisk kemi
Identifikatorer
URN: urn:nbn:se:ltu:diva-13100DOI: 10.1021/cm801399sISI: 000259871500044Scopus ID: 2-s2.0-54849423229Lokal ID: c43aa530-945d-11dd-a897-000ea68e967bOAI: oai:DiVA.org:ltu-13100DiVA, id: diva2:986051
Merknad

Validerad; 2008; 20081007 (linste)

Tilgjengelig fra: 2016-09-29 Laget: 2016-09-29 Sist oppdatert: 2023-09-05bibliografisk kontrollert

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Grahn, MattiasHolmgren, AllanHedlund, Jonas

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