Nitrogen doped hydrotalcite adsorbent preparation method

The invention discloses a nitrogen doped hydrotalcite adsorbent preparation method. The preparation method comprises the following steps: calcium-magnesium-aluminum hydrotalcite is prepared by a double-drop co-precipitation method, salting liquid and aqueous alkali are mixed in different proportions, and a mixture is subjected to aging, washing and drying to obtain the calcium-magnesium-aluminum hydrotalcite; the calcium-magnesium-aluminum hydrotalcite is used as a precursor, one of urea, melamine and hexamethylenetetramine is used as a nitrogen source, and is mixed with the calcium-magnesium-aluminum hydrotalcite according to a certain proportion, the mixture is ground, the obtained sample is subjected to calcining under nitrogen atmosphere, and the nitrogen doped hydrotalcite adsorbent is prepared. The nitrogen doped hydrotalcite adsorbent has good adsorption effect for acidic gases such as hydrogen chloride gas, has the advantages of high temperature resistance and large adsorptionquantity, and is the high