Selective Alkylation of Benzene by Propane over Bifunctional Pd-Acid Catalysts
| Autor: | Sophie E. Hodgkiss, Abdullah Alotaibi, Elena F. Kozhevnikova, Ivan V. Kozhevnikov |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
propane
Alkylation 010402 general chemistry lcsh:Chemical technology 01 natural sciences Medicinal chemistry Catalysis Propene lcsh:Chemistry chemistry.chemical_compound benzene Propane Pd-zeolite catalysts alkylation with alkanes isopropylbenzene Pd-heteropoly acid Organic chemistry Dehydrogenation lcsh:TP1-1185 Physical and Theoretical Chemistry Benzene Zeolite Bifunctional 010405 organic chemistry 0104 chemical sciences chemistry lcsh:QD1-999 |
| Zdroj: | Catalysts; Volume 7; Issue 8; Pages: 233 Catalysts, Vol 7, Iss 8, p 233 (2017) |
| ISSN: | 2073-4344 |
| DOI: | 10.3390/catal7080233 |
| Popis: | The alkylation of benzene by propane to yield isopropylbenzene (iPrPh) was studied using bifunctional Pd-acid catalysts, such as Pd-heteropoly acid and Pd-zeolite, in a fixed bed reactor at 300 °C and 1 bar pressure. Keggin-type tungstosilicic acid H4SiW12O40 (HSiW) and zeolite HZSM-5 were used as the acid components in these catalysts. The reaction occurred most efficiently over 2%Pd/25%HSiW/SiO2, giving iPrPh with up to 88% selectivity. The Pd-HSiW catalyst was more selective than the Pd-HZSM-5; the latter gave only 11–18% iPrPh selectivity. The reaction proceeded via a bifunctional mechanism including the dehydrogenation of propane to form propene on Pd sites, followed by the alkylation of benzene with the propene on acid sites. The effect of Pd loading in Pd-HSiW and Pd-HZSM-5 catalysts indicated that the first step reached quasi-equilibrium at 1.5–2% Pd loading and the second step became rate limiting. The addition of gold to Pd-HSiW enhanced the activity of this catalyst, although the Au-HSiW without Pd was inert. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|