Preparation method of TiO2/gamma-Al2O3 composite carrier material

Abstract

The invention relates to a preparation method of a TiO2 / gamma-Al2O3 composite carrier material. The method includes uniformly mixing mesoporous TiO2 crystal whisker and alumina sol, with the weight percent of the mesoporous TiO2 crystal whisker being 2-50 wt% and the weight ratio of dry mixing materials to water being 1:5-20; heating the material mixture to 60-90 DEG C, adding dropwise an inorganic acid to adjust the pH to be 2-3.5 and maintaining for 2-24 h; adding dropwise an alkaline solution to adjust the pH to be 9 to form Ti-Al-H2O composite jelly; ageing for 1-6 h, washing with deionized water to be neutral, filtering and drying in air; and calcining at 500-800 DEG C to obtain the TiO2 / gamma-Al2O3 composite carrier material. The method is simple in operation and low in cost. A molybdenum-nickel catalyst prepared from the carrier has excellent deep hydrodesulfurization performance, and is capable of reducing the sulfur content from 5000 [mu]g / g in inferior diesel oil to below 50 [mu]g / g, thus achieving the Europe IV diesel oil standard.

Description

technical field [0001] The invention relates to a catalyst carrier material used for hydrotreating petroleum fractions. Background technique [0002] With the rapid economic growth, my country's diesel demand is increasing at a rate of 5% to 6% per year, and in recent years some imported crude oil has a high content of sulfur impurities. Under the severe environmental situation, some countries and regions have put forward corresponding environmental regulations. For example, the European Union has successively formulated and implemented strict diesel emission standards such as Euro III, Euro IV, and Euro V. China has also successively formulated the National III , National IV diesel standard. [0003] Hydrodesulfurization technology is the main means to reduce the sulfur content in petroleum fractions, and its desulfurization effect largely depends on the catalytic activity of the catalyst used in the hydrodesulfurization process. Although there are many kinds of hydrodesu...

AI Technical Summary

Problems solved by technology

But ordinary TiO 2 Carriers have disadvantages such as low specific surface area, poor stability, few surface active sites, difficult molding, and high cost.

Numerous researchers will nano-TiO 2 with Al 2 o 3 For compounding, the preparation process usually adopts tetrabutyl titanate or titanium tetrachloride hydrolysis to prepare titanium sol, etc., but there are still disadvantages such as complicated preparation process and high cost, which limit the TiO2 to a certain extent. 2 Development and application of carriers and their composite carriers

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