In order to reveal the influences of ZrO₂ distribution on the catalytic performance of ZSM-5 zeolites, the Zr-incorporation has been carried out via the impregnation and chemical liquid deposition (CLD) methods to realize the random distribution and surface enrichment. Catalyst characterizations, including TEM, EDX point scan, XRF, XPS, XRD, H₂-TPR, N₂ adsorption-desorption isotherms, NH₃-TPD, Py-IR, TMPy-IR, ect., confirmed that the Zr-incorporation via the impregnation and CLD methods mostly preserved the characteristic crystal of ZSM-5 zeolites, while made a difference on the acid distribution. Compared with the Zr-impregnation, the Zr-CLD forced the introduced ZrO₂ concentrating on the external surface and generated a porous overlayer. The surface enrichment of ZrO₂ on ZSM-5 achieved a relatively stable activity as well as light olefins production, and decreased the coke deposit in n-pentane catalytic cracking in comparison to the parent HZSM-5. Also, it was found that ZrO₂ surface enrichment was more efficient to inhibit coke formation in comparison to ZrO₂ random distribution, and exhibited a coke deposit of 8.8 mg that was ca. 38% lower than the latter (14.3 mg) in the catalytic stability tests (i.e. n-pentane catalytic cracking at 550 °C for 12 h on stream with a WHSV of 3.7 h⁻¹). Furthermore, SO₄²⁻/ZrO₂/ZSM-5 was prepared by the sequential Zr-CLD and sulfation of ZSM-5 zeolites. As expected, it achieved the highest light olefins production of 3.87 g in the catalytic stability tests, which was 9.6% and 25.6% higher than that of the Zr-CLD modified and parent HZSM-5.

为了揭示ZrO ₂分布对ZSM-5沸石催化性能的影响，通过浸渍和化学液体沉积（CLD）方法进行了Zr掺入，以实现无规分布和表面富集。包括TEM，EDX点扫描，XRF，XPS，XRD，H ₂ -TPR，N ₂吸附-解吸等温线，NH ₃ -TPD，Py-IR，TMPy-IR等在内的催化剂表征证实了Zr的结合通过浸渍和CLD方法，大多数保留了ZSM-5沸石的特征晶体，同时改变了酸分布。与Zr浸渍相比，Zr-CLD强制引入了ZrO ₂集中在外表面上并产生多孔覆盖层。的ZrO表面富集₂上的ZSM-5获得了相对稳定的活性以及轻质烯烃的生产，并在降低了焦炭沉积物Ñ相比于母体HZSM-5 -戊烷催化裂化。而且，发现与ZrO ₂随机分布相比，ZrO ₂表面富集更有效地抑制了焦炭的形成，并且显示出约8.8mg的焦炭沉积。在催化稳定性试验中（即，在550°C的正戊烷催化裂化，WHSV为3.7 h ^-1的物流中进行12 h裂解）比后者（14.3 mg）低38％。此外，SO ₄ ²⁻通过顺序的Zr-CLD和ZSM-5沸石的硫酸化制备/ ZrO ₂ / ZSM-5。正如预期的那样，在催化稳定性测试中，它实现了3.87克的最高轻烯烃产量，比Zr-CLD改性的HZSM-5和母体HZSM-5分别高出9.6％和25.6％。