Phosphorus-modified zeolite with an intergrowth structure of AFX and CHA (P-AFX/CHA) was synthesized by a triple-template system. The synthesis system involved two nitrogen-containing organic structure directing agents (N-OSDAs, N,N,N-trimethyl-1-adamantammonium hydroxide and 1,1´-(1,4-butanediyl)bis(1-azonia-4-azabicyclo (Martinez and Corma, 2011; Martinez and Corma, 2011; Martinez and Corma, 2011) [2,2,2]bib2bib2octane) dibromide) for developing the intergrowth zeolite phase. Tetraethylphosphonium cation (TEP) was also added as a phosphorus-modifying agent. The calcination treatment causes the decomposition and oxidation of TEP to form a phosphorus oxide species that interacts with the zeolite framework, thereby realizing direct-phosphorus modification in the zeolite cavity. We optimized the synthesis condition of P-AFX/CHA, tuning the synthesis gel composition and selecting the counter anion in TEP, and found that tetraethylphosphonium bromide (TEPBr) is useful for effectively incorporating phosphorus into the intergrowth zeolite. ³¹P magic angle spinning (MAS) NMR confirmed the phosphorus modification via the decomposition of P-OSDA, whereas X-ray diffraction and transmission electron microscopy revealed the intergrowth structure. In addition, ¹³C dipolar decoupling (DD) MAS NMR, elemental analysis, and other synthesis results suggested the selective modification of phosphorus into the CHA phase in the intergrowth zeolite. Phosphorus modification was effective in improving the thermal stability of P-AFX/CHA. The thermal stability increased with increasing the phosphorus modification degree.

通过三模板系统合成了具有AFX和CHA共生结构的磷改性沸石（P-AFX / CHA）。该合成系统涉及两种含氮有机结构导向剂（N-OSDAs，N，N，N-三甲基-1-金刚烷铵氢氧化物和1,1′-（1,4-丁二基）双（1-氮杂-4-氮杂双环（Martinez and Corma，2011; Martinez and Corma，2011; Martinez and Corma，2011）[2 ，2,2] bib2bib2octane）dibromide）来发展共生沸石相。还添加了四乙基phosph阳离子（TEP）作为磷改性剂。煅烧处理引起TEP的分解和氧化，形成与沸石骨架相互作用的氧化磷物质，从而实现沸石腔体中的直接磷改性。我们优化了P-AFX / CHA的合成条件，调整了合成凝胶的组成并选择了TEP中的抗衡阴离子，发现四乙基溴化phosph（TEPBr）可用于有效地将磷掺入共生沸石中。³¹P魔角旋转（MAS）NMR通过P-OSDA的分解证实了磷的修饰，而X射线衍射和透射电子显微镜显示了共生结构。此外，¹³ C双极解耦（DD）MAS NMR，元素分析和其他合成结果表明，共生沸石将磷选择性修饰为CHA相。磷改性可有效改善P-AFX / CHA的热稳定性。随着磷改性度的增加，热稳定性增加。