Negative effect of NI on PTHY in n-pentane isomerization evidenced by IR and ESR studies
Ni/PtHY with different Ni loadings was prepared by impregnating HY with hexachloroplatinic acid solution and Ni2+/N, N-dimethylformamide solution. An increase in the Ni loading decreased the crystallinity, specific surface area and meso-micropores of the catalysts. Ni interacted with hydroxyl groups...
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my.utm.472692019-03-31T08:37:47Z http://eprints.utm.my/id/eprint/47269/ Negative effect of NI on PTHY in n-pentane isomerization evidenced by IR and ESR studies Ab. Aziz, Muhammad Arif Kamarudin, Nur Hidayatul Nazirah Setiabudi, Herma Dina Hamdan, Halimaton Abdul Jalil, Aishah Triwahyono, Sugeng TD Environmental technology. Sanitary engineering Ni/PtHY with different Ni loadings was prepared by impregnating HY with hexachloroplatinic acid solution and Ni2+/N, N-dimethylformamide solution. An increase in the Ni loading decreased the crystallinity, specific surface area and meso-micropores of the catalysts. Ni interacted with hydroxyl groups to produce IR absorption bands at 3740–3500 cm−1. Increasing Ni loadings resulted in a decrease in the intensities of the broad bands at 3730-3500 cm−1 and the sharp band at 3740 cm−1 with simultaneous development of new absorbance band at 3700 cm−1 that was attributed to (–OH)Ni. The acidity of the samples did not significantly change with Ni loadings up to 1.0 wt%, which indicated that Ni mostly interacts with non-acidic silanol groups (terminal- and structural-defect OH groups). The presence of Ni decreased the activity of PtHY toward the isomerization of n-pentane because of a decrease in the number of active protonic-acid sites that formed from molecular hydrogen. IR and ESR studies confirmed that Pt facilitated the formation of protonic-acid sites from molecular hydrogen, whereas Ni, even when combined with Pt, didn't exhibit such ability. The absence of protonic-acid sites from molecular hydrogen significantly decreased the yield of iso-pentane and markedly increased the cracking products. Elsevier Ltd. 2012 Article PeerReviewed Ab. Aziz, Muhammad Arif and Kamarudin, Nur Hidayatul Nazirah and Setiabudi, Herma Dina and Hamdan, Halimaton and Abdul Jalil, Aishah and Triwahyono, Sugeng (2012) Negative effect of NI on PTHY in n-pentane isomerization evidenced by IR and ESR studies. Journal Of Natural Gas Chemistry, 21 (1). pp. 29-36. ISSN 1003-9953 http://dx.doi.org/10.1016/S1003-9953(11)60329-0 DOI:10.1016/S1003-9953(11)60329-0 |
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TD Environmental technology. Sanitary engineering Ab. Aziz, Muhammad Arif Kamarudin, Nur Hidayatul Nazirah Setiabudi, Herma Dina Hamdan, Halimaton Abdul Jalil, Aishah Triwahyono, Sugeng Negative effect of NI on PTHY in n-pentane isomerization evidenced by IR and ESR studies |
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Ni/PtHY with different Ni loadings was prepared by impregnating HY with hexachloroplatinic acid solution and Ni2+/N, N-dimethylformamide solution. An increase in the Ni loading decreased the crystallinity, specific surface area and meso-micropores of the catalysts. Ni interacted with hydroxyl groups to produce IR absorption bands at 3740–3500 cm−1. Increasing Ni loadings resulted in a decrease in the intensities of the broad bands at 3730-3500 cm−1 and the sharp band at 3740 cm−1 with simultaneous development of new absorbance band at 3700 cm−1 that was attributed to (–OH)Ni. The acidity of the samples did not significantly change with Ni loadings up to 1.0 wt%, which indicated that Ni mostly interacts with non-acidic silanol groups (terminal- and structural-defect OH groups). The presence of Ni decreased the activity of PtHY toward the isomerization of n-pentane because of a decrease in the number of active protonic-acid sites that formed from molecular hydrogen. IR and ESR studies confirmed that Pt facilitated the formation of protonic-acid sites from molecular hydrogen, whereas Ni, even when combined with Pt, didn't exhibit such ability. The absence of protonic-acid sites from molecular hydrogen significantly decreased the yield of iso-pentane and markedly increased the cracking products. |
format |
Article |
author |
Ab. Aziz, Muhammad Arif Kamarudin, Nur Hidayatul Nazirah Setiabudi, Herma Dina Hamdan, Halimaton Abdul Jalil, Aishah Triwahyono, Sugeng |
author_facet |
Ab. Aziz, Muhammad Arif Kamarudin, Nur Hidayatul Nazirah Setiabudi, Herma Dina Hamdan, Halimaton Abdul Jalil, Aishah Triwahyono, Sugeng |
author_sort |
Ab. Aziz, Muhammad Arif |
title |
Negative effect of NI on PTHY in n-pentane isomerization evidenced by IR and ESR studies |
title_short |
Negative effect of NI on PTHY in n-pentane isomerization evidenced by IR and ESR studies |
title_full |
Negative effect of NI on PTHY in n-pentane isomerization evidenced by IR and ESR studies |
title_fullStr |
Negative effect of NI on PTHY in n-pentane isomerization evidenced by IR and ESR studies |
title_full_unstemmed |
Negative effect of NI on PTHY in n-pentane isomerization evidenced by IR and ESR studies |
title_sort |
negative effect of ni on pthy in n-pentane isomerization evidenced by ir and esr studies |
publisher |
Elsevier Ltd. |
publishDate |
2012 |
url |
http://eprints.utm.my/id/eprint/47269/ http://dx.doi.org/10.1016/S1003-9953(11)60329-0 |
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1643652273821188096 |