Adsorbent, vacuum heat insulating material having the same and refrigerator

A vacuum heat insulating material comprising:

• a core material;
• an adsorbent provided to adsorb a heat transfer medium such that no activation treatment of the adsorbent is required and adsorption performance of the adsorbent in a vacuum state is maintained relative to adsorption performance of the adsorbent at atmospheric pressure;
• and
• an envelope provided to accommodate the core material and the adsorbent,
• wherein the adsorbent comprises:
• a first adsorption component provided to adsorb oxygen and including a transition metal oxide having an oxygen deficiency structure, wherein the transition metal oxide includes at least one of titanium oxide (TiO2-x), where x is 0.1 or more and 0.5 or less, or cerium oxide (CeO2-x), where x is 0.1 or more and 0.7 or less;
• a second adsorption component provided to adsorb moisture, and including at least one of an alkaline earth metal oxide or a zeolite;
• and
• a third adsorption component provided with palladium oxide to adsorb hydrogen,
• wherein a weight ratio of the third adsorption component with respect to the first adsorption component is 0.01 or more and 5 or less, and
• wherein the first adsorption component is provided at 0.5 mg/L to 390 mg/L with respect to a volume of a pore formed by the core material in the envelope.

An adsorbent comprising:

• a first adsorption component provided to adsorb oxygen and including a transition metal oxide having an oxygen deficiency structure, wherein the transition metal oxide includes at least one of titanium oxide (TiO2-x), where x is 0.1 or more and 0.5 or less, or cerium oxide (CeO2-x), where x is 0.1 or more and 0.7 or less;
• a second adsorption component provided to adsorb moisture, and including at least one of an alkaline earth metal oxide or a zeolite;
• and
• a third adsorption component provided with palladium oxide to adsorb hydrogen,
• wherein a weight ratio of the third adsorption component with respect to the first adsorption component is 0.01 or more and 5 or less, and
• wherein no activation treatment of the adsorbent is required and adsorption performance of the adsorbent in a vacuum state is maintained relative to adsorption performance of the adsorbent at atmospheric pressure, and
• wherein the first adsorption component is provided at 0.5 mg/L to 390 mg/L with respect to a volume of a pore formed by a core material in an envelope of a vacuum heat insulating material.