Please use this identifier to cite or link to this item:
https://open.uns.ac.rs/handle/123456789/11369
DC Field | Value | Language |
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dc.contributor.author | Ollendorff, R. | en |
dc.contributor.author | Bošković, Goran | en |
dc.contributor.author | Butt, J. | en |
dc.date.accessioned | 2020-03-03T14:44:06Z | - |
dc.date.available | 2020-03-03T14:44:06Z | - |
dc.date.issued | 1990-01-01 | en |
dc.identifier.issn | 01669834 | en |
dc.identifier.uri | https://open.uns.ac.rs/handle/123456789/11369 | - |
dc.description.abstract | The hydrogenolysis of methylcyclopropane (MCP) was investigated over a series of Pt/Al2O3 catalysts containing different levels of chloride at atmospheric pressure and 0-100°C. Catalysts were prepared by chloriding a set of chloride-free Pt/Al2O3 catalyst that encompassed a wide range of percentage metal exposed. Both HCl and CCl4 were used as the chloride source, and both low (0.3 wt.-%) and high (1.0 wt.-%) levels of chloride were studied. MCP hydrogenolysis on the metallic function takes place via a metallocycle intermediate producing mainly i-butane (in excess H2) with a selectivity (ratio of i-butane to n-butane formation rates) of 10-15. On the acidic function the reaction goes via a carbenium ion mechanism producing an increased amount of n-butane with selectivities on the order of 1-5. While HCl chloriding increases catalyst activity, the selectivities of the series remain comparable to those on non-chlorided catalysts. However, the Pt/Al2O3-Cl ex CCl4 produces a large increase in n-butane and some increase in i-butane, with corresponding selectivities of 5-7. This increase in n-butane production is lost upon dilution of the Pt/Al2O3-Cl with additional Al2O3, presumably by Cl migration, and is indication of the participation of a localized PtClAl complex in the overall reaction. Apparent activation energies for both i- and n- butane production are about 20% higher for chlorided catalysts ex-HCl (ca. 50 and 69 kJ/mol, respectively) than those for corresponding non-chlorided materials in the mid-range of metal dispersion. Corresponding catalysts prepared ex-CCl4 show a sharp decrease in the apparent activation energy for n-butane formation, to about 30 kJ/mol, indicative of a possible shift away from metal function hydrogenation in this case. © 1990. | en |
dc.relation.ispartof | Applied Catalysis | en |
dc.title | Platinum/alumina. III. Influence of Chloride on Methylcyclopropane Hydrogenolysis at Moderate Temperatures | en |
dc.type | Journal/Magazine Article | en |
dc.identifier.doi | 10.1016/S0166-9834(00)82239-3 | en |
dc.identifier.scopus | 2-s2.0-0025436863 | en |
dc.identifier.url | https://api.elsevier.com/content/abstract/scopus_id/0025436863 | en |
dc.relation.lastpage | 103 | en |
dc.relation.firstpage | 85 | en |
dc.relation.issue | 1 | en |
dc.relation.volume | 62 | en |
item.grantfulltext | none | - |
item.fulltext | No Fulltext | - |
Appears in Collections: | TF Publikacije/Publications |
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