Preparation of metal ion modified ETS-4 molecular sieve with high adsorption performance

ID# 233717 ETS-4 had attracted more and more attentions for many researchers because of its potential properties in adsorption, gas separation, and catalysis, which has octahedral-tetrahedral structure with the potential properties that were different from the conventional zeolite materials[1]. The preparation and crystallization of ETS-4 with small pores had been reported by many researchers[2-4]. In this paper, titanosilicate ETS-4 sieves with the Sr and Ni modification were prepared by hydrotherrmal method using the titanium trichloride and tetraethoxysilane as the precursors. The properties and morphology of the materials were also characterized by XRD, SEM and PSA techniques. The Sr and Ni doping could improve the N2 and CH4 adsorption capacity of ETS-4. The N2 and CH4 adsorbance increased in the pressurization process for ETS-4-Sr and ETS-4-Ni, but no significant change in N2 and CH4 adsorbance with the pressure increasing was observed over the ETS-4 sample. At the pressure of 1200 mmHg, the N2 adsorbances for ETS-4-Sr and ETS-4-Ni were 4.2 and 3.9 times as that of ETS-4 sieve, respectively. Summary, the metal ion doping (Sr2+ and Ni2+) can improve the adsorption performance of ETS-4 greatly.