Extra-large pore ITQ-33 zeolite (ITT, 18 × 10 × 10-rings) is a very promising catalyst for the catalytic cracking of gasoil but, unfortunately, this material shows a limited hydrothermal stability due to the large germanium content present in the ITQ-33 structure. Taking this into account, the Ge-containing ITQ-33 has been post-synthetically modified using different acid procedures with the aim of studying the effect of these treatments on the overall hydrothermal stability of this extra-large pore zeolite. In this sense, the as-prepared ITQ-33 has been treated with different HCl solutions in ethanol (from 0.1 to 1 M), containing also tetraethylorthosilicate (TEOS) as silicon precursor, at different temperatures (150–175 °C). From the different acid treatments, it is observed that treating ITQ-33 with a TEOS-containing 1 M HCl solution in ethanol at 150 °C for 24 h, allows increasing the Si/Ge ratio from 2 to 3.2, mostly preserving the crystalline structure. If this acid-treatment is repeated three consecutive times, the Si/Ge can be increased up to 7.5, resulting in a highly stable extra-large pore zeolite. This post-synthetically modified ITQ-33 zeolite has been characterized by different techniques, including PXRD, FESEM, N₂ and Ar adsorption, ICP and ²⁷Al MAS NMR to unravel its physico-chemical properties. Finally, the catalytic behavior of the treated ITQ-33 zeolite has been tested for the catalytic cracking of gasoil, confirming in this way a remarkably higher hydrothermal stability when compared to the as-prepared Ge-rich ITQ-33, permitting its regeneration for successive catalytic cycles.

超大孔隙度的ITQ-33沸石（ITT，18×10×10环）是瓦斯油催化裂化的非常有前途的催化剂，但不幸的是，由于该材料中存在大量的锗，因此其水热稳定性有限。 ITQ-33结构。考虑到这一点，已使用不同的酸方法对含Ge的ITQ-33进行了后合成改性，目的是研究这些处理方法对这种超大孔沸石的整体水热稳定性的影响。从这个意义上讲，在不同的温度（150–175°C）下，已用不同的HCl乙醇溶液（0.1至1 M）处理了所制备的ITQ-33，其中还包含原硅酸四乙酯（TEOS）作为硅前体。从不同的酸处理方法来看，可以观察到，用含TEOS的1M HCl乙醇溶液在150°C下处理ITQ-33 24小时，可使Si / Ge比从2增加到3.2，主要保留了晶体结构。如果连续3次重复进行该酸处理，则Si / Ge可提高至7.5，从而得到高度稳定的超大孔沸石。这种合成后改性的ITQ-33沸石已通过多种技术进行了表征，包括PXRD，FESEM，N₂和Ar吸附，ICP和²⁷ Al MAS NMR揭示其理化性质。最后，已测试了处理后的ITQ-33沸石对瓦斯油的催化裂化的催化行为，从而证实了与制备的富Ge的ITQ-33相比，水热稳定性显着提高，从而使其能够连续再生。催化循环。