Abstract
Aerobic selective oxidation of the naturally occurring lignan hydroxymatairesinol (HMR) to another lignan oxomatairesinol (oxoMAT) was carried out at 70 °C and atmospheric pressure over different gold and gold-palladium catalysts. Several groups of gold catalysts were prepared: Au ion-exchanged on Y-zeolites promoted by Cu, Ni, Fe; Au and Au-Pd supported via deposition-precipitation with urea - DPU on metal oxides (magnesia, alumina, ceria, zirconia, and lanthanum oxide); and Au on alumina, and alumina-ceria-zirconia mixed oxides prepared by the sol-gel method. The catalysts were characterized by ICP-AES, TEM, XPS and UV-Vis techniques. Acidity of supports was studied by an FTIR method using pyridine as a probe molecule. No catalytic activity was detected in case of gold catalysts based on zeolites. Au and Au-Pd catalysts supported on metal oxides showed different activity and selectivity in the HMR transformation depending on the support acidity/basicity and the active phase. The highest activity was reached over Au supported on alumina with big transport pores displaying 100% selectivity to oxoMAT.
| Original language | English |
|---|---|
| Pages (from-to) | 95-103 |
| Number of pages | 9 |
| Journal | Journal of Catalysis |
| Volume | 291 |
| DOIs | |
| Publication status | Published - Jul 2012 |
| MoE publication type | A1 Journal article-refereed |
Funding
The authors express their gratitude to Dr. Lari Vähäsalo for HMR preparation and Mr. Markku Reunanen for product identification. The authors also thank E. Flores, P. Casillas, V. Garcia, M. Sainz, F. Ruiz, G. Vilchis, E. Aparicio, J. Peralta, J. Palomares, and M. Vega for technical support. This research project was partly supported by DGAPA-PAPIIT (UNAM, México) through Grant IN 224510 .
Keywords
- Biomass
- Gold
- Hydroxymatairesinol (HMR)
- Lignans
- Oxomatairesinol (oxoMAT)
- Palladium
- Selective oxidation
- Sol-gel