RHA-Al, RHA-Ga, RHA-In and RHA-Fe heterogeneous catalysts were prepared by modifying the surface of silica extracted from rice husk ash (RHA) with Al3+, Ga3+, In3+ and Fe3+ ions, respectively. The as-synthesized solid catalysts showed good textural and structural properties as it was confirmed by the physico-chemical techniques such as FT-IR, 29Si MAS NMR, solid-state NMR and ESR for metal nuclei, powder XRD, N2-adsorption, SEM-EDX, TEM and ICP-MS elemental analysis. The heterogeneous catalysts exhibited good activity for the benzylation and tert- butylation of benzene and some substituted...

Alkylation of phenol has been a subject of interest due to its industrial importance. In this book, the new mesoporous silica modified with sulfanilic and sulfonic acids was synthesized by using rice husk ash (RHA) as the silica source and used to study the liquid-phase alkylation of phenol with tert-butanol (TBA) as an alkylating agent. The 29Si MAS NMR showed the presence of T2, T3, Q3 and Q4 silicon centres. The 13C MAS NMR confirmed that RHABzSO3H had three chemical shifts consistent with the three carbon atoms of the propyl group and a series ...

Methylene Blue (MB) is one of the major contaminants found in water sources. Therefore, this study emphasizes the importance of the removal of this organic pollutant. Silica based metals incorporated catalysts were synthesized via sol-gel method and were characterized by several physico-chemical techiques such as FT-IR, XRD, Nitrogen Adsorption- Desorption, TGA, SEM-EDX, TEM, AAS, and Photoluminescence. The metals incorporated were titania, ceria and silver oxide. The presence of these metals were proven by the XRD, SEM-EDX and AAS analysis. The adsorption capability of Rice Husk ...