Methanol synthesizing catalyst and its prepn

Abstract

The methanol synthesizing catalyst has the molar ratio of Cu to Zn to Al to Li equal to 6:3:1:0.5, and is prepared through coprecipitation process. The preparation process includes the following steps: 1. dropping mixed solution of nitrate of Cu, Zn, Al and Li in certain molar ratio and Na2CO3 solution into small amount of deionized water while stirring and maintaining the solution pH in 7-8; and 2. ageing for 2 hr after finishing dropping, suction filtering, washing and stoving to obtain the catalyst precursor, and stoving and roasting to obtain the catalyst product. The preparation process is simple and easy to use in industrial production, and the catalyst has activity higher than traditional Cu-Zn-Al catalyst and wide application range for traditional synthetic gas and synthetic gas with relatively high CO and CO2 content.

Description

technical field

[0001] The invention relates to a catalyst for synthesizing methanol and a preparation method thereof. technical background

[0002] The process of synthesizing methanol by medium and low pressure gas phase method is an advanced process commonly used in the world at present, and the catalysts used in it are basically mixed oxides of copper, zinc and aluminum. However, due to the different preparation methods, the activity of the catalysts varies greatly.

[0003] German patent DD296855 discloses a preparation technology for synthesizing methanol catalyst, which is to co-precipitate the aqueous solution of soluble salts of copper, zinc and aluminum with alkali metal carbonate, and the precipitation is divided into two stages in the range of 20-60 ° C. Precipitate at a lower pH (4.5-5.5) first, and raise the pH value of the precipitate to 6-8 in the later stage of the reaction. Canadian patent CA1011325 discloses a preparation technology for synthesizing meth...