Ethanol-assistant synthesis of TS-1 containing no extra-framework Ti species

Kinetics simulation of propylene epoxidation over different Ti species in TS‐1

“…The kinetic model for the MME generation from the alcoholysis of PO over the untreated TS‐1 was established using the same data (Table S9) as for the PO formation. Previous studies 42‐44 proposed three possible mechanisms for the MME formation reaction, as shown in Figure 4. In Mechanism ①, the “TiO 4 ” species are considered the primary active centers for the alcoholysis of PO to form MME by serving as Lewis acid centers 42 .…”

“…Mechanism ② was proposed by Russo et al, 22 in which oxygen anions in PO were activated by hydrogen ions at β sites in the five member‐ring structure, and then reacted with methanol in liquid phase. Mechanism ③ suggests that the adsorbed methanol in the five member‐ring was more active than that in liquid phase 44 . The O─H bond in methanol is thus easier to be attacked by the PO in liquid phase.…”

A nucleation-tuned mechanism to prepare centre-crossed zeolite lamellas by the rotating/static switch crystallization strategy

“…S1 † indicate that four-coordination framework titanium is the fundamental Ti species in RS-series catalysts. 23,27 The extremely weak peak at about 280 nm, which is invisible for RS-56-AT but visible for other samples, can be ascribed to a tiny amount of partially polymerized six-coordinated non-framework Ti species 28 that is not removed by acid treatment. In particular, CCZL catalysts (RS-140-AT and RS-160-AT) have a relatively larger BET surface area (Table 3), and hierarchically micro-mesoporous structures can be distinctly observed in their N 2 adsorption-desorption isotherms and pore size distributions (Fig.…”

Crossed intergrowth triggered TS-2 microsphere: Formation mechanism, modification and catalytic performance

“…S3(c)). The presence of alcohols has been reported to be of high importance in synthesizing titanosilicates [33]. The alcohols including ethanol and butanol formed in the hydrolysis of TEOS and TBOT were then kept in the synthetic gels, which induced the formation of MEL and MFI composite (Fig.…”