Chemical thermal energy storage material structure, method of producing the same, and chemical heat accumulator

A method of producing a chemical thermal energy storage material structure, the method comprising:

• mixing at least a powdered chemical thermal energy storage material and a clay mineral having a layered ribbon structure to prepare a mixture in which a secondary particle size of the chemical thermal energy storage material is 50 μm or less;
• molding the mixture to form a molded body;
• and
• calcinating the molded body in an atmosphere containing oxygen in a temperature range of from 700° C. to lower than 800° C.