Al and Ti location in the MFI orthorhombic HZSM-5 framework. DFT calculation and neutron diffraction experiment

Domoroshchina, E. N.; Светогоров, Р. Д.; Кузьмичева, Г. М.; Kravchenko, G. V.; Pirutko, Larisa V.; Zhukova, Anna I.; Утенышев, А. Н.; Bozhenko, K. V.

doi:10.1007/s10853-023-08294-w

Cited by 3 publications

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“…A molecular sieve made of microporous silicon called Silicalite-1 has a tetrahedral MFI structure8,9. It has been noted that new molecular sieves with selective oxidation capabilities can be produced by isomorphous substituting Silicon (vi) ions in framework of silicalite-1 with tetra-and pentavalent ions like Titanium, Vanadium or Tin 10,11 . It has been demonstrated that the silica minerals Ti, V and Sn silicalite-1 have special catalytic capabilities in oxidation reactions using H 2 O 2 as the oxidant 12,13 .…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization and Catalytic application of Mn-MFI prepared by Different Methods

Thabet

2023

Orient. J. Chem

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Utilizing various techniques, the synthesis of silicalite-1 (MFI), Mn-MFIin-situ, and Mn-MFIImp samples derived from rice husk has been studied. Several physico-chemical approaches were used to characterize the produced materials. The results showed that the addition of Mn ions through in-situ preparation methods will result in a rearrangement of Silicalite's structural composition and disappearance of quartz silica. The presence of crystalline MnO2 species was noted in Mn-MFIin-situ, dealumination, and a decrease in cell volume. According to XRD, ESR, and surface texture analyses, all of the samples' FTIR spectra showed MFI structure and good assimilation of Mn species into MFI channels. The catalytic activity of the samples was measured and judged to be toward hydroxylation of benzene at a temperature of 80 degrees Celsius. The data revealed that the catalytic activity occurred in the following order: Silicalite > Mn-MFIimp > Mn-MFIin-situ.

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