Co-impregnation solution and preparation method of catalyst obtained by hydrofining paraffin oil

Abstract

The invention discloses a co-impregnation solution and a preparation method of a catalyst obtained by hydrofining paraffin oil. The preparation method is characterized by comprising the following steps of preparing a catalyst carrier; preparing an aqueous solution of ammonium metatungstate, ammonium paramolybdate or ammonium tetramolybdate, nickel nitrate and orthophosphoric acid as the co-impregnation solution at the room temperature, wherein the co-impregnation solution comprises, by concentration, 16-30 g / 100ml of WO<3>, 11-16 g / 100ml of MoO<3>, 7-10 g / 100ml of NiO and 3.5-5.5 g / 100ml of P; impregnating the carrier obtained in step 1 one time with the obtained co-impregnation solution at the room temperature; firstly, drying the impregnated carrier at the room temperature, and then conducting heating and drying under water-vapor atmosphere, so that the catalyst is obtained, wherein calcinations is conducted while heating and drying are conducted. The catalyst prepared through the method is uniform in active component distribution, large in pore volume and specific surface area and high in desulfuration activity and denitrification activity.

Description

technical field [0001] The invention discloses a method for preparing a co-immersion solution and a catalyst for hydrorefining wax oil, belonging to the technical field of wax oil catalysts. Background technique [0002] Petroleum fractions contain impurities such as sulfur, nitrogen, oxygen, and metals. The existence of these impurities will not only affect the properties of the oil, but also release harmful gases that pollute the environment during use and reduce the activity and life of the catalyst. In the hydroprocessing process of petroleum hydrocarbons as raw materials, the raw materials are reacted with hydrogen under high temperature and high pressure conditions to remove harmful substances in the raw materials, such as organic sulfides, organic nitrogen compounds, and organometallic compounds. [0003] In the prior art, there is a distillate hydrorefining catalyst, which uses alumina or silicon-containing alumina as a carrier, W, Mo, and Ni as active components, an...

AI Technical Summary

Problems solved by technology

The catalyst needs to be heated to 70°C~120°C to dissolve the compound containing active metal elements and auxiliary elements when preparing the co-immersion solution, mainly because the molybdenum compound is molybdenum trioxide with poor water solubility, which will make W and Mo mainly exist in the co-immersion solution in the form of heteropolyacid anions, which affect the formation of the active center of the catalyst in the subsequent preparation, making the pore volume and specific surface area of ​​the catalyst small

In addition, this patent adopts the method of segmental impregnation, the process is complex and cumbersome, and the production cost is relatively large.