Cuznal Catalyst In Nanoscale Synthesis, Characterization And Evaluation

Methanol is a major chemical product only inferior to ammonia.Being a fundamental material in C1 industries,methanol is widely used in organic synthesis, dyes, pesticides, paint ,national defense and other industrial fields.Recently, with the development of science and technology, the use of methanol is also continuing to expand, it has become a potential vehicle fuels and fuel-cell fuels. As a power fuel, methanol by mixing 15% of its petrol with an octane number up to 100, on the combustion characteristics similar to gasoline, and tends to incomplete combustion, be considered the most promising fuel substitute for petrol power.Methanol will be the 21st century competitive alternative clean fuel. In addition,the need of methanol increaces significantly with the world's nervous energy,so,methanol synthesis study more and more attracted the attention of all countries.At the same time,being a country rich in coal and poor in matelote,primary energy with coal-based long-term pattern will continue. steam, diesel and other liquid fuels will become increasingly serious shortage situation,for this,the development of alternative fuels, especially coal-based clean alternative fuel is imperative, and vigorously develop coal-based alcohols (mainly methanol) of alternative fuels in China is entirely in keeping with national conditions, realistic and practical.At the same time, methanol fuel cell development and application is expected to become environment-friendly fuel cell fuel, the application of methanol to bring a bright prospect.Since the 1960s,, research with methanol synthesis catalyst attracts great attention.In spite of industrialized process,there still exist many drawbacks of copper-based catalysts,such as poor tolerance to posioning,low thermal stability and low mechanial strength.A series of Cu/ZnO/Al2O3 catalysts were prepared by adding different kinds of promoter and changing preparation conditions and methods in this article .These catalysts were characterized by the means of XRD,TPR,BET and SEM.It was found that the activity of catalysts reached its maximum tops when the ratio of Cu/Zn reached 1.0.XRD patterns showed CuOand ZnO dispersed very fine in this catalysts.The existence of Aluminum remarkably ebhanced the the performance especial at its optimum 10.0mol%.In our experiments,the addition of Mn could increase the activity of the catalyst at its optimum concentration 2.0 mol%.We found that the activity of catalysts reached its maximum performance when the pregnant liquor concertration reached 0.3mol/L.and Na2CO3 was the better percipitation agent than NaHCO3 NH4HCO3 and H2C2O4.As the precipitation method,co- precipitation and fractional precipitation 1 method were superior to normal,reverse and two-stage precipitationIt was found that suitable precipitation temperature can rang from 70 to 80℃and pH 7 to 8.The suitable calcinations temperature and time was 350℃and 6 h. We found that trace CO2 in the synthesis gas can accelerate the rate of methanol synthesis and the rate of conversion of CO.The activities of catalysts reached its maxium performance when the concertrtion of CO renched 2.0%.STY was the highest at 250℃with increasing reaction temperature.At last the summarization of the whole article and prespect for the rearch of copper-based catalysts were put forward.