Method for preparing hydrogenation aromatization catalyst

Abstract

The preparation process of hydrogenating and aromatizing catalyst includes: modifying titanian and SB aluminum hydroxide with two or three of ammonium tungstate, ammonium molybdenate, cobalt nitrate and nickel nitrate; modifying ZSM-5 molecular sieve with one or two of zinc nitrate, zirconium nitrate and ammonium dihydrogen phosphate; mixing modified titanian and SB aluminum hydroxide and modified ZSM-5 molecular sieve to form the mixture; and adding sesbania powder in the amount of 2-5 wt% of the mixture, citric acid of 1-3 wt% and expanding agent of 5-15 wt% to obtain the catalyst. The catalyst can eliminate impurity sulfide in catalytic cracked gasoline effectively, lowering the olefin content in gasoline and raise octane number of gasline in hydroforming condition.

Description

technical field [0001] The invention relates to a catalyst used in the hydrogenation process of hydrocarbons, more specifically to a preparation method of a low-quality gasoline hydrogenation aromatization catalyst. Background technique [0002] With the increasingly stringent environmental regulations around the world, people have higher and higher requirements on the quality of fuel oil, and the production of clean fuel is even more important. The European IV vehicle emission standard requires that the sulfur content in gasoline be reduced to less than 50 μg / g in 2005, and the olefin content is less than 18.0% by volume; the US Tier II vehicle emission standard requires that the sulfur content in gasoline be reduced to less than 30 μg / g in 2006, The olefin content is less than 14.0% by volume, and it will be implemented in stages starting from 2004. The purpose of limiting the content of olefins, aromatics and sulfur in gasoline is to reduce harmful substances in vehicle ...

AI Technical Summary

Problems solved by technology

However, this invention uses mixing titanium dioxide powder, molecular sieve and binder as a carrier, and then saturated impregnating or immersing it with an aqueous solution containing hydrogenation active components to prepare a catalyst, so part of the hydrogenation active metals are supported on the aromatic structure. Therefore, the hydrogenation activity of the hydrogenation active metal is not fully exerted, and the aromatization activity of the modified molecular sieve is also partially inhibited, which is manifested by high reaction temperature, low desulfurization rate, and liquid Lower yield and shorter catalyst life cycle