Controlled decrease of acid strength by orthophosphoric acid on ZSM5

J. A. Lercher; G. Rumplmayr

doi:10.1016/S0166-9834(00)81239-7

Controlled decrease of acid strength by orthophosphoric acid on ZSM5

J. A. Lercher, G. Rumplmayr

Technical University of Vienna

Research output: Contribution to journal › Article › peer-review

147 Scopus citations

Abstract

H₃PO₄ was used to decrease the acid strength of ZSM5. The effects of increasing amounts of phosphorus were studied by SEM, i.r. spectroscopy and t.p.d.. Phosphorous converts strong Bronsted acid sites into weak Bronsted acid sites without changing the overall acid-base properties. The degree of conversion was monitored by the t.p.d. maxima of base molecules desorbing from Bronsted acid sites. A model for the surface structure of the modifier is proposed and discussed in terms of electronic and structural consequences. The morphology of the crystals was found to change only slightly up to 5 w% P. Higher loadings cause deposition of plates on the surfaces of the crystals.

Original language	English
Pages (from-to)	215-222
Number of pages	8
Journal	Applied Catalysis
Volume	25
Issue number	1-2 C
DOIs	https://doi.org/10.1016/S0166-9834(00)81239-7
State	Published - 15 Aug 1986
Externally published	Yes

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title = "Controlled decrease of acid strength by orthophosphoric acid on ZSM5",

abstract = "H3PO4 was used to decrease the acid strength of ZSM5. The effects of increasing amounts of phosphorus were studied by SEM, i.r. spectroscopy and t.p.d.. Phosphorous converts strong Bronsted acid sites into weak Bronsted acid sites without changing the overall acid-base properties. The degree of conversion was monitored by the t.p.d. maxima of base molecules desorbing from Bronsted acid sites. A model for the surface structure of the modifier is proposed and discussed in terms of electronic and structural consequences. The morphology of the crystals was found to change only slightly up to 5 w\% P. Higher loadings cause deposition of plates on the surfaces of the crystals.",

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T1 - Controlled decrease of acid strength by orthophosphoric acid on ZSM5

AU - Lercher, J. A.

AU - Rumplmayr, G.

PY - 1986/8/15

Y1 - 1986/8/15

N2 - H3PO4 was used to decrease the acid strength of ZSM5. The effects of increasing amounts of phosphorus were studied by SEM, i.r. spectroscopy and t.p.d.. Phosphorous converts strong Bronsted acid sites into weak Bronsted acid sites without changing the overall acid-base properties. The degree of conversion was monitored by the t.p.d. maxima of base molecules desorbing from Bronsted acid sites. A model for the surface structure of the modifier is proposed and discussed in terms of electronic and structural consequences. The morphology of the crystals was found to change only slightly up to 5 w% P. Higher loadings cause deposition of plates on the surfaces of the crystals.

AB - H3PO4 was used to decrease the acid strength of ZSM5. The effects of increasing amounts of phosphorus were studied by SEM, i.r. spectroscopy and t.p.d.. Phosphorous converts strong Bronsted acid sites into weak Bronsted acid sites without changing the overall acid-base properties. The degree of conversion was monitored by the t.p.d. maxima of base molecules desorbing from Bronsted acid sites. A model for the surface structure of the modifier is proposed and discussed in terms of electronic and structural consequences. The morphology of the crystals was found to change only slightly up to 5 w% P. Higher loadings cause deposition of plates on the surfaces of the crystals.

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VL - 25

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JO - Applied Catalysis

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IS - 1-2 C

ER -

Controlled decrease of acid strength by orthophosphoric acid on ZSM5

Abstract

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