Octanol hydrorefining catalyst and preparation method thereof

Abstract

The invention discloses an octanol hydrorefining catalyst, which belongs to the field of hydrorefining catalytic materials. The prepared catalyst is used for modifying a carrier by using a rare earth element, reducing the amount of an active component of a nickel ion entering a carrier framework and improving the content of surface nickel species; the active component is loaded by adopting a hydrothermal deposition method, the dispersion of nickel salts on the surface of a carrier pore canal by using hydrothermal high-temperature and high-pressure conditions and forming nickel precipitation with proper size at the loading initial period of the active component by using a deposition reaction, so the invention can effectively control the amount of the nickel ions entering the carrier, improve the content of the surface nickel species and simultaneously can avoid the growth of nickel oxide particles; and the catalyst greatly increases the surface nickel active site, effectively improves the utilization rate of the active component of nickel and has higher catalytic reaction activity during hydrorefining the octanol at higher airspeed. The result shows that the hydrogenation rate of an unsaturated substance in crude octanol reaches over 90 percent when the temperature is 120DEG c, the pressure is 2.5MPa, the ratio of hydrogen to liquid for feeding is 8:1 and the airspeed is 30<-1>hour.

Description

technical field [0001] The invention belongs to the technical field of hydrogenation refining catalytic materials, in particular to a hydrothermal deposition synthesis of rare earth elements modified Ni / Al 2 o 3 Catalyst preparation and application. Background technique [0002] Octanol is an important chemical raw material, widely used in plasticizing, medicine, dyestuff, pesticide and so on. In industry, octanol is mainly produced by hydrogenation of octenal, but the synthesized products often contain a small amount of reactants (octenal) and unsaturated by-products (isooctanal and octenol), which greatly affect the purity of octanol. . Due to the continuous improvement of the quality requirements of fine chemicals, it is of special significance to improve the purity of octanol and remove the unsaturated components. So far, neither imported nor domestic catalysts can achieve 100% hydrogenation rate of octenal. [0003] At present, the main method adopted in this field...

AI Technical Summary

Problems solved by technology

However, nickel-based catalysts also have some problems. They are prone to agglomeration, poor dispersion, or easy to form nickel-aluminum spinel, resulting in low nickel content on the surface and low utilization rate. Therefore, general nickel-based catalysts can only be used at higher nickel loadings better catalytic activity

The main reasons for these problems are: (1) under common preparation conditions (such as impregnation), the active component Ni is easy to enter the carrier skeleton to generate metal-carrier solid solutions or new compounds, and the generation of these components reduces the active component. Distribution on the surface of the carrier; (2) In the preparation process such as precipitation method, the precipitation reaction increases the size of nickel particles, although the content of nickel species on the surface can be increased, but the dispersion of active components is not good, which is not conducive to improving the surface active sites of the catalyst.