Phosphorus-Modified Zeolite Catalyst for Light Olefin Production

The patent combines the phosphorus introduction step with the crystallization process by adding phosphorus-containing compounds (such as phosphoric acid or phosphates) to the synthesis gel during zeolite formation. This merging of steps allows phosphorus to be incorporated into the zeolite structure during crystallization, eliminating the need for separate ion exchange or impregnation steps, thereby reducing manufacturing complexity while achieving the desired phosphorus content

The patent applies preliminary action by incorporating phosphorus during the synthesis stage rather than as a post-treatment. The phosphorus-containing compounds are added to the synthesis gel before crystallization occurs, allowing the phosphorus to be integrated into the zeolite framework during the formation process itself, which simplifies subsequent manufacturing steps

The patent applies the taking out principle by completely eliminating the organic template component from the synthesis system. Instead of using organic templates that require harsh removal procedures (such as acid treatment or incineration), the patent employs inorganic structure-directing agents or uses the phosphorus-containing compounds themselves to guide crystallization, thereby removing the harmful organic substances from the process entirely and reducing environmental impact

The patent replaces expensive and environmentally problematic organic templates with inexpensive inorganic phosphorus-containing compounds that can be easily handled and disposed of. These inorganic additives serve the temporary function of directing crystallization but can be removed by simple washing or remain as beneficial structural modifiers, eliminating the need for complex template removal procedures and reducing both cost and environmental burden

The patent merges the steam treatment and phosphorus introduction steps into a single combined process. By adding phosphorus-containing compounds to the synthesis gel during crystallization, the phosphorus is incorporated simultaneously with the zeolite formation, eliminating the need for separate steam treatment steps and significantly reducing energy consumption while maintaining zeolite stability

The patent applies preliminary action by incorporating phosphorus during the synthesis stage rather than as a post-treatment. The phosphorus-containing compounds are added to the synthesis gel before crystallization occurs, allowing the phosphorus to be integrated into the zeolite framework during the formation process itself, which eliminates subsequent steam treatment steps and reduces energy consumption

The patent applies the universality principle by designing a single zeolite catalyst with dual functionality. The zeolite is engineered to simultaneously perform both the methanol-to-olefins conversion and the olefin cracking functions that traditionally required separate catalysts. This is achieved by optimizing the zeolite's crystalline structure, pore size distribution, and acid site characteristics to enable both reaction types within one catalyst, thereby simplifying the overall process while maintaining high propylene production

The patent merges the functions of multiple catalysts into a single integrated catalyst system. By combining the MTO and cracking activities in one zeolite catalyst, the patent eliminates the need for separate reactor beds or catalyst regeneration systems, reducing device complexity and operational difficulty while maintaining the productivity benefits of the multi-catalyst approach