Atividade e seletividade de catalisadores a base de caulim modificado

Kaolinite-titanium oxide nanocomposites prepared via sol-gel as heterogeneous photocatalysts for dyes degradation

“…Silva & Cia. It was purified according to the dispersion-decantation method [25], which yielded very pure kaolinite (see Figure 1), used for further intercalation experiments. In the formulation of the intercalated and grafted compounds, purified kaolinite is abbreviated as Ka.…”

Hybrid materials prepared by interlayer functionalization of kaolinite with pyridine-carboxylic acids

“…The diffractogram of the natural sample (Fig. S1, Supplementary material) showed that it is very rich in kaolinite, but also showed the presence of quartz and mica as mineral impurities; thus, it was purified by the dispersion-decantation method [31][32][33], which allowed obtaining very pure kaolinite (Fig. 2), used for further intercalation experiments.…”

Iron(iii) porphyrin supported on metahalloysite: an efficient and reusable catalyst for oxidation reactions

“…18 In this phase, denominated metakaolinite or metahalloysite, aluminum atoms are in a tetrahedral coordination, and the kaolinite or halloysite molecular formula changes to Al 2 Si 2 O 7 . 19 Further heat-treatment decomposes the intermediate phases into g-alumina and amorphous silica. 20 Although metakaolinite can be applied as a filler in polymers, 21 a probe for morphological investigations, 22 and a precursor of petrochemical catalysts, 19 metahalloysite remains unexplored.…”

“…19 Further heat-treatment decomposes the intermediate phases into g-alumina and amorphous silica. 20 Although metakaolinite can be applied as a filler in polymers, 21 a probe for morphological investigations, 22 and a precursor of petrochemical catalysts, 19 metahalloysite remains unexplored. To the best of our knowledge, metakaolinite and metahalloysite have not yet been investigated as supports for metalloporphyrin immobilization.…”