Magnesium@high-sulfur coke hydrogen storage material and preparation method thereof

A method comprising:

• ball milling magnesium powder with coke in a first inert atmosphere to obtain a mixture;
• forming a pressed tablet by pressing the mixture, followed by melt infiltration in a second inert atmosphere to obtain an infiltrated product;
• and
• subjecting the infiltrated product to adsorption and condensation of magnesium vapor;
• wherein the method further comprises preparing the coke by:
• mixing petroleum coke with an alkali, followed by calcination activation and carbonization in a third inert atmosphere, neutralization with an acid, and washing with water and drying;
• wherein the mass ratio of the magnesium powder to the coke is in a range of 9:1 to 20:1;
• wherein the pressing comprises placing the mixture in a pressing mold and pressing the mixture at 20-40 MPa for 0.5-1.5 h;
• wherein the alkali is KOH or NaOH;
• wherein the mass ratio of the petroleum coke to the alkali is in a range of 1:2 to 1:5;
• wherein the calcination activation and carbonization in the third inert atmosphere is conducted at 900-1000° C. for 0.5-1.5 h;
• wherein the heating rate during the activation and carbonization is 3-8° C./min;
• wherein the adsorption and condensation are conducted in an adsorption condensation bed by fixing the pressed tablet at a sand core of the adsorption condensation bed, followed by introducing the magnesium vapor;
• and
• wherein circulating cooling water is introduced to an outer layer of the adsorption condensation bed during the adsorption and condensation.