Preparation of Metal Ion Modified ETS-4 Molecular Sieve with High Adsorption Performance

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

Liyun Song¹, Hongxing Dai¹,Jian Li¹, Yongling Li², Yingshu Liu²*, Hong He¹*

¹College of Environmental and Energy Engineering,

Beijing University of Technology, Beijing 100124, China

²University of Science and Technology Beijing, Xueyuan Road 30, Beijing, 100083, China

Key words: ETS-4, adsorption, PSA

Abstract

ETS-4 had attracted more and more attentions for many researchers because of its potential properties in adsorption, mixed 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.

Reference

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[4] Moises L. Pinto. J. Am. Chem. Soc. 2011, 133, 6396¨C6402