58.硫化モリブデン分散触媒を用いた石炭の水素化分解特性の解明

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Addition of water has a strong promoting effect on low-severity catalytic coal hydrogenation using in-situ generated MoS_2 catalyst from ammonium tetrathiomolybdate (ATTM). In this coal hydrogenation using ATTM and water, the conversion of coal is largest at 375℃. In order to clarify the promoting effect of water on the largest conversions at 375℃, two-step model reactions of DNE and NMBB were carried out using ATTM as the catalyst precursor in the presence and absence of water. Two-step reaction was conducted as follows: MoS_2 was prepared from ATTM with and without water at 350, 375, 400℃ in the first step. After hot-venting the gases generating from ATTM and water, model compounds were hydrogenated with and without added water at 350℃. After preparing active MoS_2 catalysts from both ATTM and ATTM+H_2O in the first step, added water in the second step decreased the conversions of both DNE and NMBB significantly. With added water in the second step, conversions of both DNE and NMBB using MoS_2 from ATTM+H_2O at 375 and 400℃ in the first step were very low and similar each other. We cannot find significant differences between the conversions of model compounds using MoS_2 generated at 375℃ and those at 400℃ in the first step. In the one-step reaction, the conversions of both DNE and NMBB using ATTM+H_2O were largest at 375℃ under the conditions we used. Since the previous DNE-conversions without hot-venting in the two-step test are larger than those with hot-venting in this study, it is possible that MoS_2 generating from ATTM and ATTM+H_2O is deactivated by the hot-venting for removing water and gases.
一般社団法人日本エネルギー学会の論文
2000-09-28

58.硫化モリブデン分散触媒を用いた石炭の水素化分解特性の解明

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