The kinetics of propylene epoxidation over Au supported on titanium silicalite-1 (Au/TS-1) catalysts were measured in a continuous stirred tank reactor (CSTR) free from temperature and concentration gradients. Apparent reaction orders measured at 473 K for H₂ (0.7 order), O₂ (0.2), and propylene (0.2) for a series of Au/TS-1 with varied Au (0.02–0.09 wt%) and Ti (Si/Ti: 75–143) contents were consistent with those reported previously. Co-feeding propylene oxide enabled measurement of the apparent reaction order in propylene oxide (−0.4 to −0.8 order) and the determination that relevant pressures of propylene oxide reversibly inhibit propylene epoxidation over Au/TS-1, while co-feeding carbon dioxide and water had no effect on the propylene epoxidation rate. Analysis of previously proposed two-site reaction mechanisms in light of reaction orders for O₂ (0.4), H₂ (1), and C₃H₆ (0.4), corrected to account for propylene oxide inhibition, provides further evidence that propylene epoxidation over Au/TS-1 occurs via a simultaneous mechanism requiring two distinct, but adjacent, types of sites, and not a sequential mechanism that invokes migration of H₂O₂ formed on Au sites to PO forming Ti sites. H₂ oxidation rates are not inhibited by propylene oxide, implying that the sites required for hydrogen oxidation are distinct from those required for propylene epoxidation.

在没有温度和浓度梯度的连续搅拌釜反应器（CSTR）中测量了负载在载有钛硅沸石-1（Au / TS-1）催化剂上的Au上丙烯环氧化的动力学。表观反应级数在473K测量ħ ₂（0.7顺序），O ₂（0.2），和丙烯（0.2）进行了一系列的Au / TS-1具有不同的Au（0.02-0.09重量％）和Ti（硅/ Ti：75-143）的含量与先前报道的一致。通过共同进料环氧丙烷，可以测量环氧丙烷的表观反应阶数（-0.4到-0.8阶数），并确定环氧丙烷的相关压力是可逆的抑制丙烯在Au / TS-1上的环氧化，而二氧化碳和水的共同进料对丙烯的环氧化速率没有影响。根据O ₂（0.4），H ₂（1）和C ₃ H ₆（0.4）的反应顺序对先前提出的两点反应机理进行分析，并纠正了环氧丙烷的抑制作用，进一步证明了丙烯环氧化通过要求两种不同但相邻的位点类型的同时机制，而不是通过顺序机制激活在Au / TS-1上发生，而不是要求将在Au位点上形成的H ₂ O ₂迁移到PO形成Ti位点的顺序机制。高₂ 氧化速率不受环氧丙烷的抑制，这意味着氢氧化所需的位点与丙烯环氧化所需的位点不同。