Nickel supported on titania-silica: Preparation, characterisation and activity for liquid phase hydrogenation of acetophenone
β Scribed by P.S. Kumbhar
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 668 KB
- Volume
- 96
- Category
- Article
- ISSN
- 0926-860X
No coin nor oath required. For personal study only.
β¦ Synopsis
TiO2:SiO2 supports were prepared by impregnation of SiO2 with an n-hexane solution of titanium tetraethoxide and were used to prepare supported nickel (20% w/w ) catalysts. The supports were characterised by X-ray fluorescence (XRF), BET surface area measurements, X-ray diffraction (XRD), UV-VIS diffuse reflectance spectroscopy, and transmission electron microscopy (TEM). The supported nickel catalysts were further characterised by hydrogen chemisorption, XRD, TEM, temperature-programmed reduction (TPR), and degree of reduction measurements. The catalysts were tested for liquidphase hydrogenation of acetophenone. The TiO~: SiO~ supports were found to have good dispersion of TiO2 at lower loading but showed agglomeration at higher loadings and existed exclusively as anatase phase. Ni/Ti02:Si02 catalysts showed strong suppression in hydrogen chemisorption similar to a Ni/ TiO2 catalyst indicating strong metal support interaction (SMSI). The catalysts showed good activity for liquid-phase hydrogenation of acetophenone, which was comparable to Ni/TiO2 and greater than Ni/SiO2. Ni/7.3%TiO2:SiO2 showed a maximum in both catalytic activity and in the suppression of hydrogen chemisorption.
π SIMILAR VOLUMES