Evaluation of the catalytic surface of Ni impregnated meso-microporous silica KIT-6 in CH4 dry reforming by inverse gas chromatography
Autor: | Harold H. Kung, Linping Qian, Haitao Wang, Guoping Chen, Mayfair C. Kung, Qiangguo Du, Kaixiang Huang, Jie Li |
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Rok vydání: | 2017 |
Předmět: |
Chromatography
Materials science Carbon dioxide reforming Methane reformer Enthalpy 02 engineering and technology General Chemistry Microporous material 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Methane 0104 chemical sciences Catalysis chemistry.chemical_compound Adsorption chemistry Chemical engineering Mechanics of Materials Inverse gas chromatography General Materials Science 0210 nano-technology |
Zdroj: | Microporous and Mesoporous Materials. 243:301-310 |
ISSN: | 1387-1811 |
Popis: | Inverse gas chromatography (IGC) was employed in evaluating the catalytic surface of meso-microporous KIT-6 impregnated Ni (0.5–2.0 wt%) in methane dry reforming reaction. The free energy of adsorption did not changed significantly for the sample modified with highly dispersed Ni species (0.5 wt%). At higher Ni loadings, higher free energy of adsorption and enthalpy of adsorption of the probes were observed, together with high dispersive interaction and specific interaction of aromatics. The results indicated that during the impregnation, Ni species preferably penetrated into the microporous region to form Ni particles and became ‘unaccessible’. This feature was used to understand the dependence of activity on Ni loading for the gas phase catalytic methane reforming with carbon dioxide on Ni/KIT-6. The lower TOF at low metal loadings was attributed to Ni particles located in the micropores which result in diffusional constraint of reactants and products. |
Databáze: | OpenAIRE |
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