A Novel Magnetic Solid Acid for Specially Cleaving the C‐O Bridged Bond in Dibenzyl Ether

Abstract

A novel magnetic solid acid was prepared by immobilizing trifluoromethanesulfonic acid (TFMSA) and AlCl3 on a magnetic support (i. e., Fe3O4 coated by SiO2). Dibenzyl ether (DBE) which contains C−O bridged‐bond was used as a coal model compound to evaluate the activity of the catalyst for cleaving Calk‐O bonds in coal. The prepared magnetic solid acid was characterized by X‐ray diffraction, transmission electron microscopy, Fourier transform infrared spectrometer, scanning electron microscopy and energy dispersive spectrometer, and NH3‐temperature‐programmed desorption. The results show that the prepared catalyst possesses nanometer size, core‐shell structure and strong acidity. The Calk‐O bond in DBE can be cleaved at a temperature of as low as 413 K over the catalyst AlCl3‐TFMSA/Fe3O4/SiO2. The attack of H+ that generated from the magnetic solid acid and/or via hydrogen heterolysis on oxygen atom of DBE could be a crucial step for DBE hydrocracking over the magnetic solid acid.

Controllable selectivity of carboxylic acids produced by H3+n[PMo12‐nVnO40]‐catalyzed oxidation of lignite and its oxidative mechanism analysis

“…Besides, lots of hydroxyl‐substituted BZA and benzaldehydes can also be detected in solution, it can be inferred from those main intermediates that 1,2‐diphenylethanol should be further oxidized into benzaldehydes and BZA, and ⋅OH plays the crucial role in the cleavage of bridge bond of 1,2‐diphenylethane. Notably, dibenzyl ether has a great potential to be cleaved due to the low bond energy of the fragile C−O bond [28] …”

“…Notably, dibenzyl ether has a great potential to be cleaved due to the low bond energy of the fragile CÀ O bond. [28] The total ion chromatograms (TICs) of o-xylene and butylbenzene as the side chains-containing models were presented in Figure 7b. The main intermediate o-tolylmethanol is generated during HPA-2-cayalyzed oxidation, implying that •OH will attack Ph-CH 2 R first, which can be ascribed to the reason that Ph-CH 2 R bond has strong stability compared to other positions of side-chains due to the conjugation effect.…”

Advances in Catalytic Hydroconversion of Typical Heavy Carbon Resources under Mild Conditions

“…A number of organic compounds were significantly enriched and even separated as pure compounds by subsequent fine separations, including fractional extraction, gradient column chromatography, and sequential crystallization from the soluble portion. − Alternatively, the soluble portion can be converted to alkanes as well as nonsubstituted and alkyl-substituted cyclanes under pressurized H 2 over Ni-loading catalysts. ,,, The insoluble portion can be ultrasonically isolated to a light insoluble portion and a heavy insoluble portion in carbon tetrachloride according to the density difference . The catalytically hydroconverted light insoluble portion can be relatively easily separated from the catalyst by the density difference, and adding a magnetic core into the catalyst further facilitates recovering the catalyst. ,,− , In addition, ultrasonically extracting a solid sample, e.g., a coal sample, significantly reduced the size of the sample particles, facilitating the CHC. Using an insoluble portion as the reactant makes an insight into the mechanisms for the CHC easier by avoiding the disturbance of the inherently existing soluble species in the raw sample.…”