Diatomite as high performance and environmental friendly catalysts for phenol hydroxylation with H₂O₂

Abstract

A series of diatomite catalysts were treated and characterized. For the first time, the resulting materials were used in catalysis for the hydroxylation of phenol with H 2 O 2 and showed very high hydroxylation activity due to the Fe species in the diatomite. The effect of HCl treatment, contents of catalysts and H 2 O 2 were investigated and the active components of diatomite were discussed. The results show that diatomite is the promising candidate for industrial output due to their high catalytic activity, easy physical separation and very low costs. r

Layer-by-layer assembly of TiO2 colloids onto diatomite to build hierarchical porous materials

“…A broad band between 200 and 350 nm centered at 260 nm is observed in initial diatomite sample. This band has been assigned to the Fe impurity in initial diatomite [30]. For TiO 2 coated diatomite, the onset of absorption shifted to about 370 nm, which is ascribed to the deposition of small size of TiO 2 crystallite on the surface of diatomite as observed by TEM.…”

Characterization of platinum–iron catalysts supported on MCM-41 synthesized with rice husk silica and their performance for phenol hydroxylation

“…Jia et al [19] used diatomite containing 0.94 wt.% Fe as a catalyst for phenol hydroxylation. The conversion of phenol at the same amount of catalysts (0.5 g) was 40%, similar to that obtained in this work when the phenol : H 2 O 2 mole ratio was 1:1.…”

Natural diatomites: Efficient green catalyst for Fenton-like oxidation of Orange II

“…Nevertheless, the use of diatomite as a catalyst rather as catalyst support has not been extensively studied [21], although, the presence of a high percentage of iron would enable its use as a heterogeneous Fenton-like catalyst without requiring major modifications.…”