Based on solid phosphoric acid catalyst (SPAC) T 49 composed of Si P B ternary system a new SPAC T 99 composed of Si P B D quaternary system was developed.

• 在硅-磷-硼三元体系的T-49固体磷酸催化剂基础上,开发了硅-磷-硼-D四元体系的T-99固体磷酸催化剂。