Preparation method of vulcanization type catalyst

Abstract

The invention discloses a preparation method of a vulcanization type catalyst. The method comprises: adopting a dipping solution containing a sulfide precursor of active metal Mo or W and an inorganic salt of Ni or Co to dip a needed catalyst carrier, and then conducting after-treatment under certain vacuum degree and temperature, thus obtaining the vulcanization type catalyst. The method can control vulcanization of the catalyst under an appropriate temperature in a startup activation process, thus avoiding untimely vulcanization of the active metal, release of a hydrogen sulfide gas and the consequent influence on equipment air tightness. Meanwhile, in the after-treatment process, redundant water in catalyst pores are removed to prevent excess water in recycle hydrogen from influencing the catalyst activity during activation and corroding equipment. The catalyst prepared by the method provided in the invention is applicable to preparation of a petroleum fraction hydrogenation catalyst.

Description

technical field [0001] The invention relates to a method for preparing a sulfurized catalyst, in particular to a method for preparing a sulfurized hydrogenation catalyst using a solution containing a metal sulfide precursor. Background technique [0002] Conventional hydrogenation catalysts are in an oxidized state, but the active substances are in a sulfurized state in actual use, so they need to be sulfurized in the reactor before use. This not only increases the production cost, but also the vulcanization process is likely to cause pollution to people and the environment, so researchers at home and abroad are actively seeking solutions. The current research mainly focuses on two aspects: one is presulfurization outside the device, and the other is the direct preparation of sulfurized catalysts. External presulfurization refers to the introduction of vulcanizing agent into the pores of the oxidized catalyst by sublimation, melting or impregnation, and then the catalyst is...

AI Technical Summary

Problems solved by technology

In the catalyst prepared by this method, the active metal does not exist in a sulfide state, and there is no problem of self-heating. However, during the start-up process of the catalyst, the active metal sulfides prematurely, releasing hydrogen sulfide gas, which affects the airtightness of the device.

In addition, the catalyst still retains some water after low-temperature drying. During the activation process of the catalyst, too much water vapor in the circulating hydrogen will corrode the device.

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