The invention relates to the field of adsorbents, and concretely provides a 5A
molecular sieve adsorbent, and a preparation method and an application thereof. The method comprises the following steps:(1) carrying out rolling molding on a
powder containing 4A
molecular sieve and a binder source to obtain
pellets, and
drying and calcining the
pellets to obtain matrix
pellets; (2) pre-
wetting the matrix pellets, and carrying out
crystal transformation to basically convert the binder in the matrix pellets into 4A
molecular sieve in order to obtain 4A molecular
sieve pellets; and (3), washing the4A molecular
sieve pellets with water, carrying out
calcium exchange to obtain 5A molecular
sieve pellets, washing the 5A molecular sieve pellets with water,
drying the washed 5A molecular sieve pellets, and calcining the dried 5A molecular sieve pellets, wherein the pre-
wetting process comprises a stage (1), a stage (2) and a stage (3), and the
ambient humidity in the stage (1) and the
ambient humidity in the stage (3) are higher than the
ambient humidity in the stage (2). The 5A molecular sieve adsorbent has the advantages of high 5A molecular sieve content, large n-
pentadecane adsorbing capacity, high adsorbing efficiency and good strength.