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Silica-incorporated aluminum (RHA-Al) was synthesized from rice husk ash (RHA) using the sol-gel technique. RHA-Al was calcined at 500 degrees C for 5 h to yield RHA-Al(C). The ratio of silica to alumina was found to be 4:1. The BET analysis of RHA-Al(C) showed an increase in total pore volume and specific surface area compared to RHA-Al. SEM and XRD showed… (More)
Silica supported iron catalyst was prepared from rice husk ash (RHA) via the sol-gel technique using an aqueous solution of iron(III) salt in 3.0 M HNO3. The sample was dried at 110 degrees C and labeled as RHA-Fe. A sample of RHA-Fe was calcined at 700 degrees C for 5 h and labeled as RHA-Fe700. X-ray diffraction spectrogram showed that both RHA-Fe and… (More)
Iron and 4-(methylamino)benzoic acid have been successfully incorporated into silica extracted from rice husk. The silica/Fe/amine complex, RH-Fe(5% amine), showed a ca. 24% increase in specific surface area compared to RH-Fe. This increase was attributed to the templated formation of regular pores. The XRD showed the RH-Fe(5% amine) to be amorphous. The… (More)
In the title compound, C(8)H(12)N(2)O(3)S·H(2)O, inter-molecular O-H⋯O and N-H⋯O hydrogen bonds and weak C-H⋯O inter-actions, which form R(1) (2)(6) and R(2) (2)(12) ring motifs, link the components into a three-dimensional network.
In the crystal structure of the title salt, C(3)H(7)N(6) (+)·NO(3) (-)·C(3)H(6)N(6)·H(2)O, the asymmetric unit consists of two neutral melamine (1,3,5-triazine-2,4,6-triamine) mol-ecules, two melaminium cations, two nitrate anions and two solvent water mol-ecules. One of the nitrate anions is disordered over two sets of positions, with a refined occupancy… (More)
There are two mol-ecules in the asymmetric unit of the title compound, C9H10N2OS. In one, the dihedral angle between the aromatic ring and the carbamo-thioyl group is 52.31 (7)° and in the other it is 36.16 (6)°. Each mol-ecule features an intra-molecular N-H⋯O hydrogen bond, which generates an S(6) ring and the O and S atoms have an anti disposition. In… (More)
In the title compound, C24H20N2, the dihedral angles between the pyrazole ring and the pendant phenyl, toluoyl and phenyl-ethenyl rings are 41.50 (8), 4.41 (8) and 31.07 (8)°, respectively. In the crystal, inversion dimers linked by a π-π stacking inter-actions between the phenyl-ethenyl rings are observed [centroid-centroid separation = 3.5857 (9) Å].
A series of iron incorporated silica catalysts were prepared using rice husk ash as a source of silica. The specific surface areas of the catalysts were found to be in the range of 200-400 m 2 g-1. The activities of the catalysts were tested for liquid phase Friedel-Crafts acylation reaction of p-xylene with benzoyl chloride. The catalyst RHA-10Fe exhibited… (More)
Spherical and needle-like cobalt nanoparticles incorporated on rice husk silica was synthesized by a simple, rapid and eco-friendly sol-gel route at room temperature. This was achieved by direct mixing of 20 wt.% Co 2+ with sodium silicate from rice husk under ambient conditions to form RH-20Co. The cobalt was found to be isomorphously substituted in the… (More)
Titania and ceria incorporated rice husk silica based catalyst was synthesized via sol-gel method using CTAB and glycerol as surface directing agents at room temperature and labeled as RHS-50Ti10Ce. The catalyst was used to study the adsorption and photodegradation of methylene blue (MB) under UV irradiation. The powder XRD pattern of RHS-50Ti10Ce was much… (More)