Enhancement of the catalytic performance to methanol synthesis from CO2/H2 by gallium addition to palladium/silica catalysts
The hydrogenation of CO2 was investigated on Ga-promoted Pd/SiO2 catalysts. A 500-fold turnover rate enhancement and an increase of the selectivity to methanol synthesis, up to 70%, were found under pseudo stationary state conditions (523 K and 3 MPa) using the promoted materials as compared to Pd/S...
| Authors: | ; ; ; |
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| Format: | Article |
| Status: | Published version |
| Publication date: | 2000 |
| Country: | Argentina |
| Institution: | Consejo Nacional de Investigaciones Científicas y Técnicas |
| Repository: | CONICET Digital (CONICET) |
| Language: | English |
| OAI Identifier: | oai:ri.conicet.gov.ar:11336/27677 |
| Online Access: | http://hdl.handle.net/11336/27677 |
| Access Level: | Open access |
| Keyword: | Methanol Synthesis Carbon Dioxide Palladium Silica https://purl.org/becyt/ford/1.4 https://purl.org/becyt/ford/1 |
| Summary: | The hydrogenation of CO2 was investigated on Ga-promoted Pd/SiO2 catalysts. A 500-fold turnover rate enhancement and an increase of the selectivity to methanol synthesis, up to 70%, were found under pseudo stationary state conditions (523 K and 3 MPa) using the promoted materials as compared to Pd/SiO2. Based on apparent activation energy values and product distribution, a reaction pathway to CH3OH involving intermediates which are intrinsically associated to adsorbed CO2 is proposed. It is concluded that the Ga-Pd interaction, proved through DRS and TPR experiments, brings the catalytic performance of these Ga-Pd/silica materials close to that of the traditional Cu/ZnO-based catalyst for methanol synthesis. |
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