It may be an important route to improve the alkylation performance of MCM-22 zeolite by regulating the Al siting during the synthesis, as the liquid alkylation of benzene with ethylene mainly occur on the acid sites in the surface pockets and supercages of MCM-22. Here, the Al siting has been successfully adjusted by introducing additional anion in the hydrothermal synthesis of MCM-22 using piperidine as the structure directing agent. The effect of the additional anion in the synthesis precursor on the physiochemical property, especially the Al siting, and alkylation performance of MCM-22 zeolite was investigated. The morphology of products tends to be irregular lamellar structure when Cl⁻, PO₄³⁻, or SO₄²⁻ are present in the synthesis gel. Although H-MCM-22-PO₄³⁻ and H-MCM-22-SO₄²⁻ show less acid site concentration than H-MCM-22, they exhibit obviously higher conversion of ethylene than H-MCM-22. This can be attributed to that more Al species are oriented to T₂ sites located in the pockets or supercages by virtue of the presence of PO₄³⁻ or SO₄²⁻ in the synthesis gel. The novel synthesis strategy may provide an alternative way to modify the performances of MCM-22 and even other zeolites.

通过在合成过程中调节Al的配位，可能是提高MCM-22沸石烷基化性能的重要途径，因为苯与乙烯的液态烷基化主要发生在MCM-22表面囊和超笼的酸性部位。在这里，通过使用哌啶作为结构导向剂在MCM-22的水热合成中引入其他阴离子，已经成功地调整了Al的位置。研究了合成前体中其他阴离子对MCM-22沸石的理化性质（特别是Al的位置）和烷基化性能的影响。产品的形态往往是不规则的层状结构时氯^-，PO ₄ ^3-，或SO ₄ ^2-存在于合成凝胶中。尽管H-MCM-22-PO ₄ ^3-和H-MCM-22-SO ₄ ^2-的酸中心浓度比H-MCM-22小，但它们的乙烯转化率明显高于H-MCM-22。这可以归因于，由于合成凝胶中存在PO ₄ ^3-或SO ₄ ^2-，更多的Al物种被定向到位于口袋或超笼中的T ₂位置。新颖的合成策略可以提供一种改变MCM-22甚至其他沸石性能的替代方法。