Preparation method of roasting-free pre-vulcanized hydrogenation catalyst

Abstract

The invention discloses a preparation method of a roasting-free pre-vulcanized hydrogenation catalyst. The method comprises the steps that the environment-friendly dipping technology is adopted for preparing the hydrogenation catalyst, after the dipped catalyst is treated under the temperature of 180-250 DEG C, an organic solvent, elemental sulfur and auxiliaries are added to be mixed to be uniform, and thermal treatment is performed to obtain the roasting-free pre-vulcanized hydrogenation catalyst. The method solves the problems that a conventional catalyst is low in activity, poor in dispersity, long in vulcanization on-stream time and high in operation cost, and meanwhile overcomes the defects that the vulcanized catalyst preparation process is complex and concentrated heat release is easy. The pre-vulcanized hydrogenation catalyst prepared through the method is high in strength, good in activity and short in preparation process flow and has the good application value.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a method for preparing a roasting-free presulfided hydrogenation catalyst, which belongs to the improvement of the method for preparing a hydrogenation catalyst. . Background technique [0002] Hydrogenation catalysts generally consist of Group VIII metals and Group VIB metals or metal oxides with hydrogenation functions, and supports and additives with certain acidic functions. Among them, the Group VIII metals are mainly Ni or Co, the Group VIB metals are mainly Mo and W, and the additives in the catalyst may contain P, Si, F, B and other components. Generally, the catalyst metal component obtained in the production process exists in an oxidized state after being roasted, and in the hydrogenation reaction process, the active metal component of the catalyst has higher reactivity when it is in a sulfurized state. Therefore, the catalyst is used It needs to be pre-vulcanized b...

AI Technical Summary

Problems solved by technology

On the one hand, when the oxidized active component is used as the precursor, the precursor and Al 2 o 3 The surface often has a strong interaction, which easily leads to uneven dispersion of the active component on the surface of the carrier, and at the same time leads to the formation of too many Al-O-Mo chemical bonds, which in turn makes it difficult to completely vulcanize the active component and form too many low-activity I phases at the same time. Low active metal utilization

In addition, taking the preparation of Mo-based catalysts as an example, the commonly used precursor ion Mo 7 o 24 6- tends to induce Al 2 o 3 Surface dissociation produces Al 3+ , and subsequently react with it to form an Anderson-type heteropolyanion Al(OH) 6 Mo 6 o 18 3- , after calcination, it is difficult to be fully vulcanized and large-grained MoO is not conducive to the improvement of catalytic activity. 3 and Al 2 (MoO 4 ) 3 species, therefore, it is difficult to achieve both high activity and high sulfidation of hydrogenation catalysts by traditional impregnation technology, resulting in unsatisfactory catalytic activity

[0004] At present, the pre-sulfurization process in the preparation technology adopts the in-vehicle vulcanization technology. The catalyst in the oxidation state is loaded into the hydrogenation reactor, and then hydrogen and sulfurizing agents are introduced into the reactor during the process of continuous heating for vulcanization. The technology is still the most widely used technology at present, but it still has a series of problems: (1) the curing time is long; (2) the curing agent is flammable and toxic, and is not friendly to the environment; (3) the operation process is complicated and the cost is high, etc.

This method can improve sulfur holding rate and catalyst activity, but further improvement is needed