Preparation of Co-NH₂-SBA-15 and its performance of desulphurization

The mesoporous molecular sieve SBA-15 was prepared by hydrothermal synthesis, modified with the ultrasonic immersion by (CH₃COO)₂Co and with the introduction of the amino group into it with APTS as silane coupling agent, and characterized by SEM, XRD, FT-IR, BET and XPS. The prepared Co-NH₂-SBA-15 was used for adsorption of H₂S at normal temperature. The results show that both amino group and metal have been introduced into the molecular sieve. When the molar ratio of amino group to silicon is 0.20 and the Co loading is 8%, the adsorption capacity of SBA-15 is the highest. Under the conditions of the volume fraction of hydrogen sulfide of 227 μL/L, the temperature of 25 ℃ and the gas flow rate of 75 mL/min, the capacities of breakthrough sulfur and saturated sulfur come to 0.151 and 0.190 mmol/g, respectively. Moreover, the adsorbent can be regenerated for recycle. Under the assistance of molecular sieve surface being grafted by amino group and impregnated by metal, the adsorption capacity can be improved and the stability of molecular sieve can be enhanced.