球形γ-Al2O3孔结构及其水热稳定性调控策略

Pore Structure and Hydrothermal Stability Control Strategies of Spherical γ-Al2O3 Carriers

摘要:

负载型催化剂广泛应用于石油化工和精细化工等重要领域，其中载体作用极为关键。多孔球形氧化铝载体因晶型众多、孔结构优异、化学性质稳定等优点，在工业载体中所占份额最大，然而其性能与相应的孔结构及其水热稳定性息息相关。本文总结了国内外在球形γ-Al2O3氧化铝孔结构及其水热稳定性调控策略方面的研究进展，一方面着重从球形γ-Al2O3前驱体、油氨柱成型过程及其后处理等三个方面着手分析载体孔结构调控规律，另一方面从氧化铝孔结构水热稳定性调控机制及其增强手段如表面羟基钝化和γ-Al2O3含量等总结其调控策略，为国内高端球形氧化铝工业载体孔结构及其水热稳定性调控提供建议，以期突破相关的关键技术，构建自主知识产权体系。

Abstract:

Supported catalysts are widely used in important fields such as petrochemicals and fine chemicals, among which the support function is extremely crucial. Porous spherical alumina carriers account for the largest share in industrial carriers due to their numerous crystal forms, excellent pore structure, and stable chemical properties. However, their performance is closely related to the corresponding pore structure and its hydrothermal stability. This work mainly summarizes the recent research progress on the pore structure and the corresponding hydrothermal stability control strategies of spherical alumina both domestically and internationally. On the one hand, it focuses on the regulation rules of carrier pore structure from three aspects: Al2O3 precursor, oil ammonia column forming process, and post-treatment. On the other hand, it discusses the regulation mechanism and enhancement methods of alumina pore structure hydrothermal stability, such as surface hydroxyl passivation and γ-Al2O3 content. It may provide suggestions for the regulation of pore structure and hydrothermal stability of high-value spherical alumina industrial carriers in China, with the aim of breaking through relevant key technologies and building an independent intellectual property system.