The following conclusions were obtained. (1) Compared with a commercial catalyst, the catalysts manufactured in this study on trial generally showed only a small in the drop in the catalytic activity and showed a superior selectivity in the hydrodesulfurization reaction at rather high reaction temperatures. (2) From the experimental results of the 2,000 hour catalytic activity tests, the authors estimated the catalytic life of the catalysts manufactured on trial to be 17 to 26 bbl/lb and that of the commercial catalyst to be 16 bbl/lb. (3) The catalysts which had large mean pore diameters showed a comparatively slow drop in the desulfurization activity. Their activity for vanadium and asphaltene removal was high.
Summary:The Effects on the catalytic activity of the differences in the preparation methods of hydrodesulfurization catalysts for residual fuel was studied. From the experimental results, the following conclusions were obtained.(1) Two stage impregnation method in which molybdenum was supported first, showed the highest activity which did not depend on whether the impregnation was carried out under normal or decreased pressure.calcination should be within such a time as would not give any effect on its physical structure.(3) The addition of such organic polymers as carbowax 4,000 and avicel in a given amount improved the activity.(4) The addition of palladium and chromium reduced the activity and the addition of magnesia improved it.(5) The optimum amount of supported metals was found to be as follows; the ratio of M0O3/ NiO=2 or 3, the amount of M0O3 12 to 15wt% the amount of NiO 4 to 5 wt%.
In Bezug auf das ggf. stufenweise Aufbringen des aktiv wirkenden Metalles zeigt sich eine höhere Aktivität, wenn der Träger zuerst mit der Molybdänsalzlösung imprägniert wird.
Zahlreiche der in der 1. Mitt. beschriebenen Katalysatoren werden in Langzeitversuchen ( 1000 bzw. 3000 Stdn.) auf ihre Standfestigkeit hin untersucht.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.