Ir/Pt-HZSM5 for n-pentane isomerization: effect of iridium loading on the properties and catalytic activity
The effects of iridium loading on the properties of Ir/Pt-HZSM5 and n-pentane isomerization were studied. XRD, IR, and NMR results indicated that increasing iridium loading did not much change the properties of catalysts, but eliminated the perturbed silanol groups at 3700 and 3520 cm -1, whereas IR...
Saved in:
Main Authors: | , , |
---|---|
Format: | Article |
Published: |
Elsevier
2012
|
Subjects: | |
Online Access: | http://eprints.utm.my/id/eprint/32874/ http://dx.doi.org/10.1016/j.jcat.2012.07.012 |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
id |
my.utm.32874 |
---|---|
record_format |
eprints |
spelling |
my.utm.328742019-03-05T02:03:30Z http://eprints.utm.my/id/eprint/32874/ Ir/Pt-HZSM5 for n-pentane isomerization: effect of iridium loading on the properties and catalytic activity Setiabudi, H. D. Abdul Jalil, Aishah Triwahyono, Sugeng TP Chemical technology The effects of iridium loading on the properties of Ir/Pt-HZSM5 and n-pentane isomerization were studied. XRD, IR, and NMR results indicated that increasing iridium loading did not much change the properties of catalysts, but eliminated the perturbed silanol groups at 3700 and 3520 cm -1, whereas IR and ESR spectroscopy confirmed that increasing iridium loading continuously decreased the permanent Lewis and Bronsted acid sites and inhibited the formation of protonic acid sites induced by hydrogen. At low iridium loading (0-0.3 wt%), cracking process proceed through dimerization-cracking step, whereas high iridium loading (0.5-2.0 wt%) reduces the contribution of dimerization-cracking step and promotes the contribution of hydrogenolysis. The excessive amount of iridium loading, with the presence of a low amount of active protonic acid sites and hydrogen gas, accelerated the hydrogenolysis process. The activity of Ir/Pt-HZSM5 was marginal in the absence of hydrogen, showing the dependence of activity on promotive effect of hydrogen. Elsevier 2012-10 Article PeerReviewed Setiabudi, H. D. and Abdul Jalil, Aishah and Triwahyono, Sugeng (2012) Ir/Pt-HZSM5 for n-pentane isomerization: effect of iridium loading on the properties and catalytic activity. Journal of Catalysis, 294 . pp. 128-135. ISSN 0021-9517 http://dx.doi.org/10.1016/j.jcat.2012.07.012 DOI:10.1016/j.jcat.2012.07.012 |
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 |
TP Chemical technology |
spellingShingle |
TP Chemical technology Setiabudi, H. D. Abdul Jalil, Aishah Triwahyono, Sugeng Ir/Pt-HZSM5 for n-pentane isomerization: effect of iridium loading on the properties and catalytic activity |
description |
The effects of iridium loading on the properties of Ir/Pt-HZSM5 and n-pentane isomerization were studied. XRD, IR, and NMR results indicated that increasing iridium loading did not much change the properties of catalysts, but eliminated the perturbed silanol groups at 3700 and 3520 cm -1, whereas IR and ESR spectroscopy confirmed that increasing iridium loading continuously decreased the permanent Lewis and Bronsted acid sites and inhibited the formation of protonic acid sites induced by hydrogen. At low iridium loading (0-0.3 wt%), cracking process proceed through dimerization-cracking step, whereas high iridium loading (0.5-2.0 wt%) reduces the contribution of dimerization-cracking step and promotes the contribution of hydrogenolysis. The excessive amount of iridium loading, with the presence of a low amount of active protonic acid sites and hydrogen gas, accelerated the hydrogenolysis process. The activity of Ir/Pt-HZSM5 was marginal in the absence of hydrogen, showing the dependence of activity on promotive effect of hydrogen. |
format |
Article |
author |
Setiabudi, H. D. Abdul Jalil, Aishah Triwahyono, Sugeng |
author_facet |
Setiabudi, H. D. Abdul Jalil, Aishah Triwahyono, Sugeng |
author_sort |
Setiabudi, H. D. |
title |
Ir/Pt-HZSM5 for n-pentane isomerization: effect of iridium loading on the properties and catalytic activity |
title_short |
Ir/Pt-HZSM5 for n-pentane isomerization: effect of iridium loading on the properties and catalytic activity |
title_full |
Ir/Pt-HZSM5 for n-pentane isomerization: effect of iridium loading on the properties and catalytic activity |
title_fullStr |
Ir/Pt-HZSM5 for n-pentane isomerization: effect of iridium loading on the properties and catalytic activity |
title_full_unstemmed |
Ir/Pt-HZSM5 for n-pentane isomerization: effect of iridium loading on the properties and catalytic activity |
title_sort |
ir/pt-hzsm5 for n-pentane isomerization: effect of iridium loading on the properties and catalytic activity |
publisher |
Elsevier |
publishDate |
2012 |
url |
http://eprints.utm.my/id/eprint/32874/ http://dx.doi.org/10.1016/j.jcat.2012.07.012 |
_version_ |
1643649165805223936 |
score |
13.160551 |