Acidic properties of HZSM-5 using acetonylacetone, TPD of ammonia, and FTIR of adsorbed pyridine

Zaki S. Seddigi

Acidic properties of HZSM-5 using acetonylacetone, TPD of ammonia, and FTIR of adsorbed pyridine

Zaki S. Seddigi^*

^*Corresponding author for this work

King Fahd University of Petroleum & Minerals

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

3 Scopus citations

Abstract

The acidic properties of the commercial zeolite catalyst HZSM-5 (Si/Al = 25) were evaluated using different techniques. Temperature programmed desorption (TPD) of ammonia showed the presence of both weak and strong acidic sites. FTIR of adsorbed pyridine showed the presence of both Brönsted (1545.2 cm^-1) and Lewis acidic sites (1445.1 cm^-1). Using the acetonylacetone method to assess the acid/basic properties in zeolites is a very interesting quantitative method that is not commonly used. Using this method, we have shown that the active sites in this catalyst are not completely acidic, but some basic sites also exist, that cannot be detected by the other two methods. Such understanding is very critical for reactions requiring an entirely acidic or basic surface.

Original language	English
Pages (from-to)	149-156
Number of pages	8
Journal	Arabian Journal for Science and Engineering
Volume	27
Issue number	2 A
State	Published - Jul 2002

Keywords

Acetonylacetone reaction
Acidity
FTIR
HZSM-5
TPD

ASJC Scopus subject areas

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Cite this

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title = "Acidic properties of HZSM-5 using acetonylacetone, TPD of ammonia, and FTIR of adsorbed pyridine",

abstract = "The acidic properties of the commercial zeolite catalyst HZSM-5 (Si/Al = 25) were evaluated using different techniques. Temperature programmed desorption (TPD) of ammonia showed the presence of both weak and strong acidic sites. FTIR of adsorbed pyridine showed the presence of both Br{\"o}nsted (1545.2 cm-1) and Lewis acidic sites (1445.1 cm-1). Using the acetonylacetone method to assess the acid/basic properties in zeolites is a very interesting quantitative method that is not commonly used. Using this method, we have shown that the active sites in this catalyst are not completely acidic, but some basic sites also exist, that cannot be detected by the other two methods. Such understanding is very critical for reactions requiring an entirely acidic or basic surface.",

keywords = "Acetonylacetone reaction, Acidity, FTIR, HZSM-5, TPD",

author = "Seddigi, \{Zaki S.\}",

year = "2002",

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volume = "27",

pages = "149--156",

journal = "Arabian Journal for Science and Engineering",

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T1 - Acidic properties of HZSM-5 using acetonylacetone, TPD of ammonia, and FTIR of adsorbed pyridine

AU - Seddigi, Zaki S.

PY - 2002/7

Y1 - 2002/7

N2 - The acidic properties of the commercial zeolite catalyst HZSM-5 (Si/Al = 25) were evaluated using different techniques. Temperature programmed desorption (TPD) of ammonia showed the presence of both weak and strong acidic sites. FTIR of adsorbed pyridine showed the presence of both Brönsted (1545.2 cm-1) and Lewis acidic sites (1445.1 cm-1). Using the acetonylacetone method to assess the acid/basic properties in zeolites is a very interesting quantitative method that is not commonly used. Using this method, we have shown that the active sites in this catalyst are not completely acidic, but some basic sites also exist, that cannot be detected by the other two methods. Such understanding is very critical for reactions requiring an entirely acidic or basic surface.

AB - The acidic properties of the commercial zeolite catalyst HZSM-5 (Si/Al = 25) were evaluated using different techniques. Temperature programmed desorption (TPD) of ammonia showed the presence of both weak and strong acidic sites. FTIR of adsorbed pyridine showed the presence of both Brönsted (1545.2 cm-1) and Lewis acidic sites (1445.1 cm-1). Using the acetonylacetone method to assess the acid/basic properties in zeolites is a very interesting quantitative method that is not commonly used. Using this method, we have shown that the active sites in this catalyst are not completely acidic, but some basic sites also exist, that cannot be detected by the other two methods. Such understanding is very critical for reactions requiring an entirely acidic or basic surface.

KW - Acetonylacetone reaction

KW - Acidity

KW - FTIR

KW - HZSM-5

KW - TPD

UR - https://www.scopus.com/pages/publications/0035982816

M3 - Article

AN - SCOPUS:0035982816

SN - 2193-567X

VL - 27

SP - 149

EP - 156

JO - Arabian Journal for Science and Engineering

JF - Arabian Journal for Science and Engineering

IS - 2 A

ER -

Acidic properties of HZSM-5 using acetonylacetone, TPD of ammonia, and FTIR of adsorbed pyridine

Abstract

Keywords

ASJC Scopus subject areas

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