Ammonia gas adsorbent and preparation method thereof

[0027] The present invention provides a method of preparing a ammonia adsorbent according to the above scheme, comprising the steps of:

[0028] Metal chloride is dissolved in a solvent to give a metal chloride solution;

[0029] Mix the molecular sieve with a metal chloride solution, dried to give an active component;

[0030] The active group was dispensed into a slurry coated on cordierite honeycomb ceramic to obtain ammonia absorbent.

[0031] The present invention dissolves the metal chloride in a solvent to obtain a metal chloride solution. In the present invention, the solvent is preferably water, methanol, ethanol. In the present invention, the concentration of the metal chloride solution is preferably 5% to 20%, more preferably 10% to 15% by weight, and more preferably 10% to 15% by weight.

[0032] After the metal chloride solution was obtained, the molecular sieve was mixed with a metal chloride solution to obtain an active component. In the present invention, the mixing manner is preferably stirred. In the present invention, the stirring speed is preferably from 100 to 500 r / min, and the time of agitation is preferably 2 h. In the present invention, the drying temperature is preferably 70 to 90 ° C, more preferably 80 ° C; the dry time is preferably from 4 to 6 h, more preferably 5 h. In the present invention, after mixing the molecular sieve and the metal chloride solution, the molecular sieve simultaneously adsorbs the metal chloride and solvent in the metal chloride solution, and after the molecular sieve is suction, dry, dry and remove the solvent, then placed in a metal chloride solution. Adsorption until adsorption is completed.

[0033] After the active component is obtained, the active group is dispensed into a slurry to coated on cordierite honeycomb ceramic to obtain ammonia absorbent. In the present invention, the method of dispensing the formation of a slurry is preferably: mixing the active components, water, and binder. In the present invention, the binder is preferably a silica sol, an aluminum sol or a thin aluminum stone. In the present invention, the active components, the mass ratio of the binder and water are preferably from 1: 0.5 to 1: 8 to 8.5, more preferably from 1: 1: 8. In the present invention, the coating is preferably vacuum adsorption. The vacuum adsorption is preferably 0.1 to 0.5 MPa, and the vacuum adsorption time is preferably 4 to 6 min, more preferably 5 min. In the present invention, it is preferably purged and dried after vacuum adsorption. In the present invention, the drying temperature is preferably 90 to 110 ° C, more preferably 100 ° C; the dry time is preferably from 2.5 to 3.5 h, more preferably 3 h.

[0034] The present invention coated the active component on a cordierite honeycomb ceramic that can further increase the contact area of ​​ammonia gas, increase the adsorption amount of ammonia gas, and the adsorbent component is applied to honeycomb ceramics and fully dispersed the adsorbent. Component, thereby avoiding the stack of adsorbents to pacify powder.

[0036] Example 1

[0037] Active component preparation

[0038] The 20 g of ZSM-5 molecular sieves were mixed in a copper chloride solution having a concentration of 80 g of a mass concentration of 5%, and the molecular sieve was taken out in an oven at 80 ° C for 5 h at an oven at 80 ° C, then placed in chlorine after drying. Adsorption in the copper copper solution, repeat the above operation until the adsorption is completed, resulting in an active component.

[0039] 2. Application

[0040] The active component is uniformly dispersed in deionized water, and an aluminum sol binder (active component: binder: water mass ratio is 1: 1: 8), stirring at a rotational speed of 100 R / min for 2 h, then immersed in Bluestone honeycomb ceramics (active components are 30% of cordierite honeycomb ceramics), vacuum adsorption (vacuum is 0.5 MPa) 2min, take-out, purged, 100 ° C for 3 h, to obtain ammonia absorbent.

[0041] Example 2

[0042] Active component preparation

[0043] The 20 g of SAPO-34 molecular sieves were mixed in a calcium chloride solution having a concentration of 5 g of a concentration of 20%, and stirred at a rotational speed of 100 R / min for 2 h, and then dried in an oven at 70 ° C for 6 h to obtain an active component.

[0044] 2 coated

[0045] The active component is uniformly dispersed in deionized water, adding a silica sol binder (active component: binder: water mass ratio of 1: 0.5: 8.5), stirred at a speed of 100 r / min for 2 h, then immerse Bluestone honeycomb ceramics (active components are 25% of cordierite honeycomb ceramics), vacuum adsorption (vacuum is 0.1 MPa) 5 min, take it, purged, 110 ° C for 2.5 h, to obtain ammonia adsorbents.