Phosphorus promotion and poisoning in zeolite-based materials: synthesis, characterisation and catalysis

Bij, Hendrik E. van der; Weckhuysen, Bert M.

doi:10.1039/c5cs00109a

Cited by 167 publications

(147 citation statements)

References 188 publications

(1,312 reference statements)

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“…However, based on toluene adsorption isotherms (Figure S5), shape selective effects can be ruled out. Whether bulkier aromatic molecules, as suggested by Abubakar et al . on P‐modified ZSM‐5, can be formed inside of the pores of the Ca modified ZSM‐5 catalyst is still not clear.…”

Section: Resultsmentioning

confidence: 99%

Suppression of the Aromatic Cycle in Methanol‐to‐Olefins Reaction over ZSM‐5 by Post‐Synthetic Modification Using Calcium

et al. 2016

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Incorporation of Ca in ZSM‐5 results in a twofold increase of propylene selectivity (53 %), a total light‐olefin selectivity of 90 %, and a nine times longer catalyst lifetime (throughput 792 gMeOH gcatalyst−1) in the methanol‐to‐olefins (MTO) reaction. Analysis of the product distribution and theoretical calculations reveal that post‐synthetic modification with Ca2+ leads to the formation of CaOCaOH+ that strongly weaken the acid strength of the zeolite. As a result, the rate of hydride transfer and oligomerization reactions on these sites is greatly reduced, resulting in the suppression of the aromatic cycle. Our results further highlight the importance of acid strength on product selectivity and zeolite lifetime in MTO chemistry.

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Section: Resultsmentioning

confidence: 99%

Suppression of the Aromatic Cycle in Methanol‐to‐Olefins Reaction over ZSM‐5 by Post‐Synthetic Modification Using Calcium

et al. 2016

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“…In the steamed 8MR zeolites, trimethylphosphite is expected to be too large to fit through 8MR pores and thus can only access acid sites in the mesopores and on the crystallite surface. Similar trimethylphosphite treatments have been used to modify the acidity and shape selectivity of ZSM-5 for various catalytic processes [18][19][20]. We initially verified the treatment method on a ZSM-5 with a Si/Al ratio of 15 to confirm that the Brønsted acid sites are effectively poisoned by the trimethylphosphite treatment ( Figure S1).…”

Section: Accepted Manuscriptmentioning

confidence: 93%

Steam-dealuminated, OSDA-free RHO and KFI-type zeolites as catalysts for the methanol-to-olefins reaction

Birmingham

Deimund

et al. 2016

Microporous and Mesoporous Materials

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“…This may indicate that dehydration of zeolite induced the polymerization of nearby phosphorus species. 16,17 Solid-State MAS NMR Spectra of the CW Sample. The MAS NMR spectra of the CW sample were shown in Figures 2 and 3.…”

Section: Resultsmentioning

confidence: 99%

Solid‐State MAS NMR Study of Hydrated/Dehydrated Phosphorus‐modified ZSM‐5 Zeolite

Kim

2018

Bulletin Korean Chem Soc

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The chemical changes of the phosphorus-modified ZSM-5 zeolites in hydration/dehydration processes have been studied by using the solid-state MAS NMR spectroscopy. The identification of the chemical species of the steamed or washed zeolite could be done by analyzing the spectral changes on the solid-state multinuclear MAS NMR spectroscopy when the zeolite was hydrated and dehydrated. It was reconfirmed that the steaming process effectively remove Al-attached polyphosphates from the zeolite framework even though the zeolite was modified with phosphorus but the washing process did not. Dehydration process led to a dramatic change of aluminum species by breaking the aluminum-oxygen bond in the zeolite framework and to a formation of polyphosphate attached to aluminum.

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Phosphorus promotion and poisoning in zeolite-based materials: synthesis, characterisation and catalysis

Abstract: Complex interactions between phosphorus and zeolites are related to several promotional and poisoning effects in zeolite catalysis.

Cited by 167 publications

References 188 publications

Suppression of the Aromatic Cycle in Methanol‐to‐Olefins Reaction over ZSM‐5 by Post‐Synthetic Modification Using Calcium

Suppression of the Aromatic Cycle in Methanol‐to‐Olefins Reaction over ZSM‐5 by Post‐Synthetic Modification Using Calcium

Steam-dealuminated, OSDA-free RHO and KFI-type zeolites as catalysts for the methanol-to-olefins reaction

Solid‐State MAS NMR Study of Hydrated/Dehydrated Phosphorus‐modified ZSM‐5 Zeolite

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