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Evidence of Intracrystalline Mesostructured Porosity in Zeolites by Advanced Gas Sorption, Electron Tomography and Rotation Electron Diffraction
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK).
Vise andre og tillknytning
2014 (engelsk)Inngår i: ChemCatChem, ISSN 1867-3880, E-ISSN 1867-3899, Vol. 6, nr 11, s. 3110-3115Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The small size of micropores (typically <1 nm) in zeolites causes slow diffusion of reactant and product molecules in and out of the pores and negatively impacts the product selectivity of zeolite based catalysts, for example, fluid catalytic cracking (FCC) catalysts. Size-tailored mesoporosity was introduced into commercial zeolite Y crystals by a simple surfactant-templating post-synthetic mesostructuring process. The resulting mesoporous zeolite Y showed significantly improved product selectivity in both laboratory testing and refinery trials. Advanced characterization techniques such as electron tomography, three-dimensional rotation electron diffraction, and high resolution gas adsorption coupled with hysteresis scanning and density functional theory, unambiguously revealed the intracystalline nature and connectivity of the introduced mesopores. They can be considered as molecular highways that help reactant and product molecules diffuse quickly to and away from the catalytically active sites within the zeolite crystals and, thus, shift the selectivity to favor the production of more of the valuable liquid fuels at reduced yields of coke and unconverted feed.

sted, utgiver, år, opplag, sider
2014. Vol. 6, nr 11, s. 3110-3115
Emneord [en]
catalysis, characterization, cracking, mesoporous materials, zeolites
HSV kategori
Identifikatorer
URN: urn:nbn:se:su:diva-110177DOI: 10.1002/cctc.201402499ISI: 000344330800014OAI: oai:DiVA.org:su-110177DiVA, id: diva2:787500
Merknad

AuthorCount:7;

Tilgjengelig fra: 2015-02-10 Laget: 2014-12-08 Sist oppdatert: 2017-12-04bibliografisk kontrollert

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