Interaction of zn2+ with extraframework aluminium in HBEA zeolite and its role in enhancing n-pentane isomerization
The electrodeposition method was used to produce Zn2+ cation precursors, followed by the introduction of Zn2+ cation precursors to HBEA by the ion exchange technique. The introduction of Zn2+ cations slightly changed the specific surface area and crystallinity of HBEA. IR, XPS and solid state MAS NM...
Saved in:
Main Authors: | , , , , , , , |
---|---|
Format: | Article |
Published: |
Elsevier Ltd.
2012
|
Subjects: | |
Online Access: | http://eprints.utm.my/id/eprint/47116/ https://dx.doi.org/10.1016/j.apcata.2012.04.020 |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
id |
my.utm.47116 |
---|---|
record_format |
eprints |
spelling |
my.utm.471162019-03-05T02:03:08Z http://eprints.utm.my/id/eprint/47116/ Interaction of zn2+ with extraframework aluminium in HBEA zeolite and its role in enhancing n-pentane isomerization Kamarudin, Nur Hidayatul Nazirah Abdul Jalil, Aishah Triwahyono, Sugeng Mukti, Rino R. Ab.Aziz, Muhammad Arif Setiabudi, Herma Dina Mohd.Muhid, Mohd. Nazlan Hamdan, Halimaton QD Chemistry The electrodeposition method was used to produce Zn2+ cation precursors, followed by the introduction of Zn2+ cation precursors to HBEA by the ion exchange technique. The introduction of Zn2+ cations slightly changed the specific surface area and crystallinity of HBEA. IR, XPS and solid state MAS NMR results showed that Zn2+ cations interacted with (AlO)+ extraframework aluminum to form Zn(OAl)2 and simultaneously induced the formation of bridging hydroxyl groups, Si(OH)Al. The pyridine adsorbed IR study revealed that the presence of Zn2+ cations fully eliminated weak and partially eliminated strong Brønsted acid sites. As a result, strong and relatively weak Lewis acid sites were formed in which the pyridine probe molecule desorbed at 623 K and below. The presence of Zn2+ cations enhanced the catalytic activity of HBEA in n-pentane isomerization due to the presence of strong Lewis acid sites; the sites may facilitate the formation and maintenance of active protonic acid sites through a hydrogen spillover mechanism. At 598 K, the yield of isopentane for Zn-HBEA was 25.7% higher than that of HBEA. Within a reaction temperature range of 373–648 K, the apparent activation energy for isomerization of n-pentane over HBEA and Zn-HBEA was 118.76 and 90.79 kJ/mol, respectively. Elsevier Ltd. 2012 Article PeerReviewed Kamarudin, Nur Hidayatul Nazirah and Abdul Jalil, Aishah and Triwahyono, Sugeng and Mukti, Rino R. and Ab.Aziz, Muhammad Arif and Setiabudi, Herma Dina and Mohd.Muhid, Mohd. Nazlan and Hamdan, Halimaton (2012) Interaction of zn2+ with extraframework aluminium in HBEA zeolite and its role in enhancing n-pentane isomerization. Applied Catalysis A: General, 431-43 . pp. 104-112. ISSN 0926-860X https://dx.doi.org/10.1016/j.apcata.2012.04.020 DOI:10.1016/j.apcata.2012.04.020 |
institution |
Universiti Teknologi Malaysia |
building |
UTM Library |
collection |
Institutional Repository |
continent |
Asia |
country |
Malaysia |
content_provider |
Universiti Teknologi Malaysia |
content_source |
UTM Institutional Repository |
url_provider |
http://eprints.utm.my/ |
topic |
QD Chemistry |
spellingShingle |
QD Chemistry Kamarudin, Nur Hidayatul Nazirah Abdul Jalil, Aishah Triwahyono, Sugeng Mukti, Rino R. Ab.Aziz, Muhammad Arif Setiabudi, Herma Dina Mohd.Muhid, Mohd. Nazlan Hamdan, Halimaton Interaction of zn2+ with extraframework aluminium in HBEA zeolite and its role in enhancing n-pentane isomerization |
description |
The electrodeposition method was used to produce Zn2+ cation precursors, followed by the introduction of Zn2+ cation precursors to HBEA by the ion exchange technique. The introduction of Zn2+ cations slightly changed the specific surface area and crystallinity of HBEA. IR, XPS and solid state MAS NMR results showed that Zn2+ cations interacted with (AlO)+ extraframework aluminum to form Zn(OAl)2 and simultaneously induced the formation of bridging hydroxyl groups, Si(OH)Al. The pyridine adsorbed IR study revealed that the presence of Zn2+ cations fully eliminated weak and partially eliminated strong Brønsted acid sites. As a result, strong and relatively weak Lewis acid sites were formed in which the pyridine probe molecule desorbed at 623 K and below. The presence of Zn2+ cations enhanced the catalytic activity of HBEA in n-pentane isomerization due to the presence of strong Lewis acid sites; the sites may facilitate the formation and maintenance of active protonic acid sites through a hydrogen spillover mechanism. At 598 K, the yield of isopentane for Zn-HBEA was 25.7% higher than that of HBEA. Within a reaction temperature range of 373–648 K, the apparent activation energy for isomerization of n-pentane over HBEA and Zn-HBEA was 118.76 and 90.79 kJ/mol, respectively. |
format |
Article |
author |
Kamarudin, Nur Hidayatul Nazirah Abdul Jalil, Aishah Triwahyono, Sugeng Mukti, Rino R. Ab.Aziz, Muhammad Arif Setiabudi, Herma Dina Mohd.Muhid, Mohd. Nazlan Hamdan, Halimaton |
author_facet |
Kamarudin, Nur Hidayatul Nazirah Abdul Jalil, Aishah Triwahyono, Sugeng Mukti, Rino R. Ab.Aziz, Muhammad Arif Setiabudi, Herma Dina Mohd.Muhid, Mohd. Nazlan Hamdan, Halimaton |
author_sort |
Kamarudin, Nur Hidayatul Nazirah |
title |
Interaction of zn2+ with extraframework aluminium in HBEA zeolite and its role in enhancing n-pentane isomerization |
title_short |
Interaction of zn2+ with extraframework aluminium in HBEA zeolite and its role in enhancing n-pentane isomerization |
title_full |
Interaction of zn2+ with extraframework aluminium in HBEA zeolite and its role in enhancing n-pentane isomerization |
title_fullStr |
Interaction of zn2+ with extraframework aluminium in HBEA zeolite and its role in enhancing n-pentane isomerization |
title_full_unstemmed |
Interaction of zn2+ with extraframework aluminium in HBEA zeolite and its role in enhancing n-pentane isomerization |
title_sort |
interaction of zn2+ with extraframework aluminium in hbea zeolite and its role in enhancing n-pentane isomerization |
publisher |
Elsevier Ltd. |
publishDate |
2012 |
url |
http://eprints.utm.my/id/eprint/47116/ https://dx.doi.org/10.1016/j.apcata.2012.04.020 |
_version_ |
1643652238104592384 |
score |
13.160551 |