Reaction of Di(1-naphthyl)methane over Metals and Metal−Sulfur Systems

Abstract

The reaction of di(1-naphthyl)methane (DNM) was investigated as a model reaction for coal liquefaction using Fe, Ni, and Pd/C both in the presence and in the absence of sulfur. The results show that Fe, Ni, and Pd/C mainly catalyzed DNM hydrogenation, whereas added sulfur, which was likely to react with Fe, Ni, and Pd/C to form their sulfides, retarded DNM hydrogenation but promoted DNM hydrocracking. According to the results, we consider that the metals predominately catalyzed biatomic hydrogen transfer, whereas their sulfides selectively promoted monatomic hydrogen transfer.

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

“…A part of benzyl cation attacks the benzene ring ortho‐position of benzyl alcohol to produce intermediate (IM3) . Then the intermediate becomes protonated ether (TS3) by intramolecular hydrogen transfer, and the protonated ether loses H 2 O to produce carbonium ion intermediate (IM4) quickly.…”

Effects of hydrogen and FeNi–S/γ-Al 2 O 3 on the hydroconversion of extraction residue from Geting bituminous coal in cyclohexane

“…Different from metals, metal sulfides, such as Fe-S and Ni-S, predominantly promote hydrocracking via monatomic hydrogen transfer, i.e., radical hydrogen transfer to the ipso-position of condensed aromatic rings in coals [12,[28][29][30]. Sulfur was found to have a synergic effect on the activated carbon-catalyzed hydrocracking of DNM by catalyzing H 2 S dissociation [31].…”

Catalytic hydroconversion of Geting bituminous coal over FeNi–S/γ-Al2O3

“…The bond scission can be significantly promoted by the assistance of AHAs and the radical hydrogen transfer (RHT) [19]. Metal catalysts exhibit high activity for di(1-naphthyl)methane (DNM) hydrogenation, whereas metal-sulfur systems distinctly catalyze DNM hydrocracking [20][21][22]. Hei et al [23] investigated the cleavage reactions of CRMCs (e.g., diphenylmethane, phenyloxybenzene, and bibenzyl) promoted by H 2 S. They concluded that the resulting active sulfur radicals played a crucial role in the cleavage.…”