PETR 113 |
| The side-chain alkylation of toluene has been studied over basic catalysts such as basic oxides (MgO, CaO) or alkali metals (Na, Rb, Cs, K) exchanged zeolites. In this contribution, we tried to impregnate MgO into the carbon templated mesoporous zeolites in a direct method. Firstly, the surface of carbon nanospheres was modified with metal oxide precursors and then the metal oxide impregnated carbon was used as a hard template to synthesize single crystal-shaped mesoporous zeolite. The encapsulated metal oxides were confirmed as nanoparticles with high dispersion into mesopores which were surrounded as the external surface of the zeolitic parts. After calcination, impregnated MgO showed X-ray amorphous and their super-basicity was measured by TPD of CO2. The directly encapsulated MgO catalysts having both mesoporosity and zeolitic microporosity showed better resistance to deactivation with the enhanced selectivities and activities in the side alkylation of toluene with methanol, especially by giving quite less other alkylaromatics as by products besides ethylbenzene and further dehydrogenated styrene as products. |
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Zeolite Catalysis for Green Chemistry in Synthesis of Chemicals and Fuels
1:20 PM-5:30 PM, Tuesday, April 8, 2008 Morial Convention Center -- Rm. 208, Oral
Division of Petroleum Chemistry |