Oxidation of adamantanone and norcamphor over tin containing mesoporous molecular sieves

Sn-based catalysts for Baeyer-Villiger oxidations by using hydrogen peroxide as oxidant

“…9b, further indicating the high catalytic activity of Sn-based SBA-16 catalyst. This is also consistent with the result reported by Nekoksová et al [65] in which Sn-MCM-48 with a cubic mesophase of cross-linked 3D channels exhibited higher conversion rates of adamantanone and norcamphor oxidation than Sn-MCM-41 with a block of one-way hexagonal channels. The 3D channels structure facilitates the diffusion of reactants and the transport of products resulting in the enhanced BV oxidation catalytic activity.…”

“…As a representative, the Sn-beta-zeolite catalysts follow this type catalytic mechanism which was firstly reported by Corma et al [40], so does Sn-MFI-ns [46], Sn substituted delaminated zeolites (Sn-DZ-1) [48], and the Sn-based NaY zeolites [50]. In addition, this type of catalytic mechanism is also applicable for Sn-based mesoporous catalysts such as Sn-MCM-41 [59,60], Sn-SBA-15 [64], Sn-MCM-48 [65], Sn-SBA-16 [71], Sn-MWW [77]. Sn-based cationic clay catalysts such as Sn-palygorskite [84,85], Sn-MMT [89], Sn-bentonite [90], and Sn-based polymer catalysts such as aminomethyl polystyrene resin supported tin complex (PS-Sn) [134], chloromethyl polystyrene supported dendritic Sn complexes catalyst (P-PAMAM-HBA (1.0G)-Sn(II)) [135], cellulose supported dendritic Sn complexes catalyst (P-PAMAM-HBA (2.0G)-Sn (II)) [136], chitosan supported dendritic Sn complexes [137], porous Sn(IV) phenylphosphonates (SnPP) [140].…”

“…More importantly, this Sn-SBA-16 material with tetrahedral-positioned Sn species exhibited high catalytic activity for BV oxidation of adamantanone with 60% conversion rate and almost 100% selectivity of lactone at the pH value of 6 as shown in Fig. 9a [71], which was comparable to the Sn-MCM-48 [65]. In contrast, the Zr incorporated SBA-16 (Zr-SBA-16) shows much lower conversion rate for BV oxidation of adamantanone as shown in Fig.…”

“…Compared to hexagonal honeycomb Sn-MCM-41, cubic mesophase Sn-MCM-48 would exhibit much higher catalytic performance, as an example, Sn-MCM-48 exhibited conversion rates of 51%-100% and 53%-86% for adamantanone and norcamphor BV oxidations respectively by using H2O2 as oxidation agent, while Sn-MCM-41 exhibited conversion rates of 42%-90% and 32%-73%, accordingly [65]. Moreover, the selectivity to adamantanone-lactone as well as norcamphor-lactone was almost 100% for the cubic mesophase Sn-MCM-48 catalyst.…”

Selective conversion of trioses to lactates over Lewis acid heterogeneous catalysts

“…29 The slight increase in the unit cell parameter (a 0 ) of these mesoporous materials compared with that of the all-silica MCM-41 confirms the successful incorporation of Si-substituting metals in the framework (see Table 1). 30 31 The pore size distribution is narrow for all three materials and is centred at 2.5 nm for Sn-MCM-41 and Al-MCM-41 and at 2.9 nm for Ga-MCM-41.…”