关键词:

天然黏土, 介孔分子筛, 稳定性, 表征

Abstract:

Mesoporous molecular sieves were synthesized by using natural clay, sodium silicate and aluminum chloride as raw materials and cetyl trimethyl ammonium bromide (CTAB) as template agent at room temperature alkaline condition.The as-synthesized samples were characterized by means of XRD, TEM, FT-IR and N₂ physical adsorption.The results showed that mesoporous molecular sieve was successfully synthesized by addition of natural clay at room temperature, and had a specific surface area of 902 m²·g^-1 and an average pore size of 3.97 nm.After calcination at 750℃ for 3h, the specific surface area of the synthesized sample decreased, but the synthesized sample still had mesoporous structure.In addition, after hydrothermal treatment at 100℃ for 15 d, the synthesized sample had a specific surface area of 776.78 m²·g^-1 and an average pore size of 4.34 nm, showing that mesoporous molecular sieve with highly thermal and hydrothermal stabilities was synthesized by addition of natural clay at room temperature.

Key words:

天然黏土, 介孔分子筛, 稳定性, 表征