Study on the application of microporous membrane separation technology in the preparation of methanol catalyst
High sodium content in methanol catalyst will affect the activity and selectivity of the catalyst.The aluminum gel carrier of methanol catalyst is washed and desodified by microporous membrane separation technology.The concentration of aluminum glue,washing time,water consumption and membrane pore size during the washing process are explored,and the key properties of the catalyst such as crystal structure,surface properties and thermal stability are analyzed by XRD,nitrogen adsorption and desorption,thermogravimetry,H2-TPR and other characterization methods.The results show that the sodium concentration in the aluminum glue after membrane washing is reduced by 93.9%,and the sodium mass fraction in the obtained catalyst is reduced to 489 mg/kg.The grain size of the active center CuO of the catalyst is smaller,and the specific surface area,pore volume and average pore size are higher.The performance test show that the initial activity,thermal activity and selectivity of the catalyst treated by the separation membrane are higher than those of the untreated catalyst,and the crude methanol produced by the catalyst has lower impurity content.
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