Influence of the activation temperature on the physicochemical properties and catalytic activity of La-X zeolites for isobutane/cis-2-butene alkylation

Alexander Guzman; Iker Zuazo; Andreas Feller; Roberta Olindo; Carsten Sievers; Johannes A. Lercher

doi:10.1016/j.micromeso.2006.08.006

Influence of the activation temperature on the physicochemical properties and catalytic activity of La-X zeolites for isobutane/cis-2-butene alkylation

Alexander Guzman, Iker Zuazo, Andreas Feller, Roberta Olindo, Carsten Sievers, Johannes A. Lercher

Chair of Chemical Technology II

Technical University of Munich

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

30 Scopus citations

Abstract

The influence of the activation temperature on the physicochemical properties and catalytic activity of La-X zeolites for isobutane/cis-2-butene alkylation was investigated. Under optimal activation conditions, molecularly adsorbed water was detected by in situ IR and ¹H MAS NMR spectroscopy, as well as temperature programmed desorption. Bridging hydroxyl groups were not involved in hydrogen bonding of these water molecules. Isobutane/cis-2-butene adsorption together with isobutane/n-butene alkylation indicates that the water left on the catalyst after activation at 423-453 K promotes the rate of hydride transfer with respect to that of alkene addition. As a consequence, the catalyst lifetime in alkylation was shorter for the sample activated at higher temperatures (553 K) than for those having molecular water adsorbed in the zeolite pores.

Original language	English
Pages (from-to)	49-57
Number of pages	9
Journal	Microporous and Mesoporous Materials
Volume	97
Issue number	1-3
DOIs	https://doi.org/10.1016/j.micromeso.2006.08.006
State	Published - 29 Dec 2006

Keywords

Alkylation
Hydrogen bonding
IR spectroscopy
La-exchanged X zeolite
Molecularly adsorbed water
Zeolitic hydroxyl groups and lattice vibration

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10.1016/j.micromeso.2006.08.006

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title = "Influence of the activation temperature on the physicochemical properties and catalytic activity of La-X zeolites for isobutane/cis-2-butene alkylation",

abstract = "The influence of the activation temperature on the physicochemical properties and catalytic activity of La-X zeolites for isobutane/cis-2-butene alkylation was investigated. Under optimal activation conditions, molecularly adsorbed water was detected by in situ IR and 1H MAS NMR spectroscopy, as well as temperature programmed desorption. Bridging hydroxyl groups were not involved in hydrogen bonding of these water molecules. Isobutane/cis-2-butene adsorption together with isobutane/n-butene alkylation indicates that the water left on the catalyst after activation at 423-453 K promotes the rate of hydride transfer with respect to that of alkene addition. As a consequence, the catalyst lifetime in alkylation was shorter for the sample activated at higher temperatures (553 K) than for those having molecular water adsorbed in the zeolite pores.",

keywords = "Alkylation, Hydrogen bonding, IR spectroscopy, La-exchanged X zeolite, Molecularly adsorbed water, Zeolitic hydroxyl groups and lattice vibration",

author = "Alexander Guzman and Iker Zuazo and Andreas Feller and Roberta Olindo and Carsten Sievers and Lercher, {Johannes A.}",

note = "Funding Information: Partial financial support by the Verband der Chemischen Industrie is gratefully acknowledged.",

year = "2006",

month = dec,

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doi = "10.1016/j.micromeso.2006.08.006",

language = "English",

volume = "97",

pages = "49--57",

journal = "Microporous and Mesoporous Materials",

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T1 - Influence of the activation temperature on the physicochemical properties and catalytic activity of La-X zeolites for isobutane/cis-2-butene alkylation

AU - Guzman, Alexander

AU - Zuazo, Iker

AU - Feller, Andreas

AU - Olindo, Roberta

AU - Sievers, Carsten

AU - Lercher, Johannes A.

N1 - Funding Information: Partial financial support by the Verband der Chemischen Industrie is gratefully acknowledged.

PY - 2006/12/29

Y1 - 2006/12/29

N2 - The influence of the activation temperature on the physicochemical properties and catalytic activity of La-X zeolites for isobutane/cis-2-butene alkylation was investigated. Under optimal activation conditions, molecularly adsorbed water was detected by in situ IR and 1H MAS NMR spectroscopy, as well as temperature programmed desorption. Bridging hydroxyl groups were not involved in hydrogen bonding of these water molecules. Isobutane/cis-2-butene adsorption together with isobutane/n-butene alkylation indicates that the water left on the catalyst after activation at 423-453 K promotes the rate of hydride transfer with respect to that of alkene addition. As a consequence, the catalyst lifetime in alkylation was shorter for the sample activated at higher temperatures (553 K) than for those having molecular water adsorbed in the zeolite pores.

AB - The influence of the activation temperature on the physicochemical properties and catalytic activity of La-X zeolites for isobutane/cis-2-butene alkylation was investigated. Under optimal activation conditions, molecularly adsorbed water was detected by in situ IR and 1H MAS NMR spectroscopy, as well as temperature programmed desorption. Bridging hydroxyl groups were not involved in hydrogen bonding of these water molecules. Isobutane/cis-2-butene adsorption together with isobutane/n-butene alkylation indicates that the water left on the catalyst after activation at 423-453 K promotes the rate of hydride transfer with respect to that of alkene addition. As a consequence, the catalyst lifetime in alkylation was shorter for the sample activated at higher temperatures (553 K) than for those having molecular water adsorbed in the zeolite pores.

KW - Alkylation

KW - Hydrogen bonding

KW - IR spectroscopy

KW - La-exchanged X zeolite

KW - Molecularly adsorbed water

KW - Zeolitic hydroxyl groups and lattice vibration

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U2 - 10.1016/j.micromeso.2006.08.006

DO - 10.1016/j.micromeso.2006.08.006

M3 - Article

AN - SCOPUS:33751421367

SN - 1387-1811

VL - 97

SP - 49

EP - 57

JO - Microporous and Mesoporous Materials

JF - Microporous and Mesoporous Materials

IS - 1-3

ER -

Influence of the activation temperature on the physicochemical properties and catalytic activity of La-X zeolites for isobutane/cis-2-butene alkylation

Abstract

Keywords

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