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首页> 外文期刊>RSC Advances >Germanosilicate zeolite ITQ-44 with extra-large 18-rings synthesized using a commercial quaternary ammonium as a structure-directing agent
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Germanosilicate zeolite ITQ-44 with extra-large 18-rings synthesized using a commercial quaternary ammonium as a structure-directing agent

机译：使用商业季铵盐作为结构导向剂合成的具有特大18环的锗硅酸盐沸石ITQ-44

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摘要

Germanosilicate zeolite ITQ-44 with extra-large 18-rings has been hydrothermally synthesized by using a commercial benzyltriethylammonium bromide (denoted as SDA-1) as structure-directing agent (SDA). The crystallization field and the influence of various synthetic factors on the synthesis of ITQ-44, such as the crystallization temperature, the crystallization time, the Si/Ge ratio, and the amount of the F- and water have been studied. The as-synthesized ITQ-44 has been characterized by XRD, ICP, CHN, TG, SEM, NMR, N-2 adsorption and NH3-TPD. The results indicate that use of SDA-1 cations could lead to a pure phase of ITQ-44 in a wide synthetic range and remain intact in the final product. The framework structure of ITQ-44 is maintained at 500 degrees C. B, Al and Ga atoms can be introduced into the framework of germanosilicate ITQ-44, which produces Lewis acid sites in the framework. This work offers the possibility to synthesize extra-large pore germanosilicate zeolites with simple and commercial SDAs, which is important for the practical applications of germanosilicate zeolites.
机译：通过使用商业化的苄基三乙基溴化铵（表示为SDA-1）作为结构导向剂（SDA），水热合成了具有超大18环的锗硅酸盐沸石ITQ-44。研究了结晶场和各种合成因素对ITQ-44合成的影响，例如结晶温度，结晶时间，Si / Ge比以及F-和水的量。合成后的ITQ-44的特征是XRD，ICP，CHN，TG，SEM，NMR，N-2吸附和NH3-TPD。结果表明，使用SDA-1阳离子可以在广泛的合成范围内产生ITQ-44的纯相，并在最终产品中保持完整。 ITQ-44的骨架结构保持在500摄氏度。B，Al和Ga原子可以引入到锗硅酸盐ITQ-44的骨架中，该骨架在骨架中产生路易斯酸位。这项工作提供了使用简单且商业化的SDA合成超大孔隙锗硅酸盐沸石的可能性，这对于锗硅酸盐沸石的实际应用非常重要。

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