In this work, bio-inspired Au nanoparticles (NPs) were loaded through an ionic-liquid-enhanced-immobilization method onto TS-1 support, leading to efficient Au/TS-1 catalysts for gas-phase propylene epoxidation in the presence of O2 and H2. Specifically, the mesoporous TS-1 was synthesized by a hydrothermal method using nanosized TS-1 (size of ∼ 220 nm) as seeds, and the support was then etched with acid (HCl or HNO3). Both the pristine TS-1 and Au/TS-1 catalysts were fully characterized to understand the effects of preparation conditions on the catalytic performance in propylene epoxidation. Interestingly, it was found that the amount of Lewis acid sites in the seed-induced TS-1 was greater than that on the control sample formed without seed; more importantly, the size of the loaded Au NPs can be regulated by changing the amount of Lewis acid site. Furthermore, we have demonstrated that the post-treatment of TS-1 with appropriate acid sites could enhance the propylene conversion and propylene oxide (PO) selectivity.

中文翻译：

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用仿生金纳米颗粒固定的种子诱导沸石 TS-1 用于丙烯与 O2 和 H2 的环氧化

在这项工作中，通过离子液体增强固定化方法将仿生金纳米粒子 (NPs) 负载到 TS-1 载体上，从而获得了在 O2 存在下用于气相丙烯环氧化的高效 Au/TS-1 催化剂和 H2。具体而言，介孔 TS-1 是通过水热法合成的，使用纳米尺寸的 TS-1（尺寸约为 220 nm）作为种子，然后用酸（HCl 或 HNO3）蚀刻载体。对原始 TS-1 和 Au/TS-1 催化剂进行了充分表征，以了解制备条件对丙烯环氧化催化性能的影响。有趣的是，发现种子诱导的 TS-1 中路易斯酸位点的数量大于没有种子形成的对照样品；更重要的是，可以通过改变路易斯酸位点的量来调节负载的 Au NPs 的大小。此外，我们已经证明用适当的酸位点对 TS-1 进行后处理可以提高丙烯转化率和环氧丙烷 (PO) 的选择性。