Biopolymer templated porous TiO2: An efficient catalyst for the conversion of unutilized sugars derived from hemicellulose
| Autor: | Asim Bhaumik, Sudipta De, Basudeb Saha, Bharat S. Rana, Anil K. Sinha, Saikat Dutta, Astam K. Patra |
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| Rok vydání: | 2012 |
| Předmět: |
Aqueous solution
Chemistry Thermal desorption spectroscopy Process Chemistry and Technology Inorganic chemistry technology industry and agriculture Sorption engineering.material Catalysis Nanomaterial-based catalyst chemistry.chemical_compound Chemical engineering Ionic liquid engineering Hemicellulose Biopolymer |
| Zdroj: | Applied Catalysis A: General. :197-203 |
| ISSN: | 0926-860X |
| DOI: | 10.1016/j.apcata.2012.06.002 |
| Popis: | An efficient procedure for the conversion of unutilized abundant sugar derivatives, such as d -mannose, d -galactose and lactose, into platform molecule 5-hydroxymethylfurfural in aqueous and organic medium is reported. This process involves biopolymer sodium alginate templated porous TiO 2 nanocatalysts containing strong Lewis acidic sites as determined by pyridine-IR and temperature programmed desorption (TPD) of ammonia studies. Porous TiO 2 materials were characterized by XRD, SEM, HR-TEM and N 2 sorption techniques. Biopolymer templating pathway provided effective synthetic route for the TiO 2 nanomaterials, which contain considerable mesoscopic void space as revealed from the HR-TEM and N 2 sorption studies. Using this TiO 2 catalyst, improved HMF yields were obtained without using expensive ionic liquids as solvents. Hydrothermally obtained TiO 2 nanocatalysts showed maximum activity in d -mannose conversion to HMF, whereas nonporous TiO 2 is inactive in this reaction. Porosity (surface area), small particle size and strong acidic sites generated through biopolymer templating pathway are crucial for high catalytic activity. |
| Databáze: | OpenAIRE |
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