CAJ | 학술논문

以 Beta 分子筛为晶核,通过二步水热晶化法成功制备了形态良好的 Beta/ MCM-22核壳结构复合分子筛。采用 X 射线衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)及 N2吸附-脱附技术等对分子筛进行了表征。结果表明,复合分子筛形态规整,Beta 与 MCM-22分别作为核壳而共生；Beta/ MCM-22复合分子筛孔结构性质介于 MCM-22、Beta 分子筛之间。在酸性分布上,复合分子筛的中强酸及 B 酸所占比例显著增加(CB / CL =13.8)。通过 Ar-H2等离子体对 Beta 分子筛进行处理,使其表面能提高并使表面正电荷富集、硅羟基增加,这是形成良好 Beta/ MCM-22核壳结构的内在原因。
이 Beta 분자사위정핵,통과이보수열정화법성공제비료형태량호적 Beta/ MCM-22핵각결구복합분자사。채용 X 사선연사(XRD)、소묘전경(SEM)、투사전경(TEM)급 N2흡부-탈부기술등대분자사진행료표정。결과표명,복합분자사형태규정,Beta 여 MCM-22분별작위핵각이공생；Beta/ MCM-22복합분자사공결구성질개우 MCM-22、Beta 분자사지간。재산성분포상,복합분자사적중강산급 B 산소점비례현저증가(CB / CL =13.8)。통과 Ar-H2등리자체대 Beta 분자사진행처리,사기표면능제고병사표면정전하부집、규간기증가,저시형성량호 Beta/ MCM-22핵각결구적내재원인。
With Beta zeolite as the core crystals, core-shell Beta / MCM-22 composite zeolites with uniformmorphology were synthesized by a two-step hydrothermal method. The composite zeolites were characterized by XRD, SEM, TEM, N2-adsorption and FT-IR. The results showed the composite zeolites exhibit uniformstructured morphology; Beta and MCM-22 zeolites act as core and shell, respectively. The pore structure of Beta / MCM-22 composite zeolites was between those of MCM-22 and Beta zeolites. The amounts of mediumacidic sites and br?nsted acidic sites are increased markedly (CB / CL = 13. 80) in the composite zeolites. The surface energy, Si-OH groups and surficial positive charges of Beta zeolites are enriched through Ar-H2 plasmasurface treatment , which contributes to the formation of uniform core-shell Beta / MCM-22 composite zeolites.