Influence of mild dealumination on physicochemical, acidic and catalytic properties of H-ZSM-5
Mild dealumination of ZSM-5 using HCl, acetylacetone and ammonium hexafluorosilicate resulted in a slight increase in the XRD crystallinity and overall surface area, but there was a marginal decrease in the micropore area and a considerable increase in mesopore area. 27Al MAS–NMR spectra showed very...
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Published in | Journal of molecular catalysis. A, Chemical Vol. 154; no. 1; pp. 115 - 120 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
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Amsterdam
Elsevier B.V
20.03.2000
Elsevier |
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Abstract | Mild dealumination of ZSM-5 using HCl, acetylacetone and ammonium hexafluorosilicate resulted in a slight increase in the XRD crystallinity and overall surface area, but there was a marginal decrease in the micropore area and a considerable increase in mesopore area.
27Al MAS–NMR spectra showed very weak signals due to octahedral aluminium for the samples treated with HCl and acetylacetone. FTIR spectra revealed small amounts of extra framework Al and four bands due to OH stretching vibration. The nature and intensity of the bands due to different hydroxyl groups varied depending on the treatment. Dealumination resulted in an increase in
m-xylene conversion but a decrease in isomerization selectivity. The activity was maximum for HCl- and acetylacetone-treated samples that is attributed to the increase in the overall acidity (both Lewis and Bronsted) of samples as well as to the creation of mesoporosity. |
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AbstractList | Mild dealumination of ZSM-5 using HCl, acetylacetone and ammonium hexafluorosilicate resulted in a slight increase in the XRD crystallinity and overall surface area, but there was a marginal decrease in the micropore area and a considerable increase in mesopore area.
27Al MAS–NMR spectra showed very weak signals due to octahedral aluminium for the samples treated with HCl and acetylacetone. FTIR spectra revealed small amounts of extra framework Al and four bands due to OH stretching vibration. The nature and intensity of the bands due to different hydroxyl groups varied depending on the treatment. Dealumination resulted in an increase in
m-xylene conversion but a decrease in isomerization selectivity. The activity was maximum for HCl- and acetylacetone-treated samples that is attributed to the increase in the overall acidity (both Lewis and Bronsted) of samples as well as to the creation of mesoporosity. |
Author | Sivasanker, S. Kumar, S. Sinha, A.K. Hegde, S.G. |
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Keywords | Dealumination Acidity Disproportionation Isomerization ZSM-5 m-Xylene Hydrocarbon NMR spectrometry Zeolite X ray diffraction Mesoporosity Molecular sieve Infrared spectrometry Heterogeneous catalysis Benzenic compound Physicochemical properties Catalyst Modified material |
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Snippet | Mild dealumination of ZSM-5 using HCl, acetylacetone and ammonium hexafluorosilicate resulted in a slight increase in the XRD crystallinity and overall surface... |
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SubjectTerms | Acidity Catalysis Catalysts: preparations and properties Chemistry Dealumination Disproportionation Exact sciences and technology General and physical chemistry Isomerization m-Xylene Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry ZSM-5 |
Title | Influence of mild dealumination on physicochemical, acidic and catalytic properties of H-ZSM-5 |
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