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- W1569367324 abstract "The results concern mechanical mixtures of sulfided CoMo (14% MoO3, 3% CoO) deposited on a non-acidic support, i.e. SiO2, with silica-aluminas (6.5, 12 or 60 wt.% Al2O3). A strong synergy between the two components is observed: (i) in the extremely selective cracking of diphenyl methane (DPM) to benzene and toluene under hydrogen pressure (5 MPa; 673 K; feed (wt.%): 29.5 DPM, 70 n-dodecane and 0.5 benzothiophene added for keeping the catalyst sulfided); (ii) FTIR band at 1540 cm−1 of pyridine relatively strongly adsorbed on Brönsted acid sites; and (iii) extend of D-H exchange as detected by FTIR OD bands. No hydrogenation of the benzenic rings is observed. Spillover hydrogen increases the acidity, the rate of cracking of DPM and the rate of D-H exchange. A new mechanism for explaining the cracking of DPM in the presence of hydrogen is proposed. In addition to creating Brönsted sites, spillover hydrogen would act as a dual hydrogenizing agent, with spillover H+ creating first a carbonium ion, which would decompose to carbenium, this carbenium reacting with a spillover hydride ion H− to form toluene." @default.
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- W1569367324 date "1997-01-01" @default.
- W1569367324 modified "2023-09-27" @default.
- W1569367324 title "Creation of acidic sites by hydrogen spillover in model hydrocracking systems" @default.
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- W1569367324 doi "https://doi.org/10.1016/s0167-2991(97)80019-5" @default.
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