Selective epoxidation of olefins is a very important reaction as epoxides are widely been used as platform chemical in polymer and pharmaceutical industries. Unlike conventional oxidants like molecular O₂ or peroxides, the use of CO₂ as a soft oxidant for the oxidation of olefins is very challenging as it offers the utilization of waste and plentiful CO₂ together with the potential for the mitigation of its harmful environmental effect. Thus, this process is cost effective and environmentally challenging. Herein, we report the synthesis of a new crystalline porous organosilica material TSOS-1 with orthorhombic crystal structure by using a tailor made bridging organoslilane precursor prepared through the Schiff base condensation of p-terphenyl-4,4′'-dialdehyde and 3-aminopropyl-trimethoxysilane. This novel crystalline material TSOS-1 has been synthesized hydrothermally in the absence of any structure-directing agent and it showed high BET surface area (220 m² g⁻¹) and nanoscale porosity. TSOS-1 is used as a support for stabilizing tiny AgNPs to obtain a robust nanocatalyst Ag@TSOS-1, which efficiently catalyses the conversion of styrene into predominantly styrene oxide (SO) using CO₂ as a soft oxidant in an autoclave reactor under mild reaction conditions.

烯烃的选择性环氧化是一个非常重要的反应，因为环氧化物被广泛用作聚合物和制药行业的平台化学品。与分子 O ₂或过氧化物等传统氧化剂不同，使用 CO ₂作为烯烃氧化的软氧化剂非常具有挑战性，因为它提供了废物和大量 CO ₂的利用以及减轻其有害环境影响的潜力. 因此，该过程具有成本效益且对环境具有挑战性。在此，我们报告了使用通过p的席夫碱缩合制备的特制桥接有机硅烷前体合成具有正交晶体结构的新型结晶多孔有机二氧化硅材料 TSOS-1。-三联苯-4,4''-二醛和3-氨基丙基-三甲氧基硅烷。这种新型晶体材料 TSOS-1 是在没有任何结构导向剂的情况下通过水热合成的，它显示出高 BET 表面积（220 m ² g ^-1）和纳米级孔隙率。TSOS-1 用作稳定微小 AgNPs 的载体以获得稳定的纳米催化剂 Ag@TSOS-1，该催化剂在温和条件下在高压釜反应器中使用 CO ₂作为软氧化剂有效催化苯乙烯转化为主要是氧化苯乙烯（SO）反应条件。