Photocatalytic Reduction of CO2 to CH3OH Coupling with the Oxidation of Amine to Imine

CuMoxW(1-x)O4 Solid Solution Display Visible Light Photoreduction of CO2 to CH3OH Coupling with Oxidation of Amine to Imine

“…The mechanism for photocatalytic reduction of CO 2 to CH 3 OH coupling with the conversion of amine to corresponding imine is similar to our previous report [ 61 ] as shown in Figure 4 . Details are as follows: Catalyst + hv → catalyst ∗ + e - cond + p + val , PhCH 2 NH 2 + 2p + val → PhCH=NH + 2H + cond , CO 2 + 2H + cond + 2e - cond → HCOOH, HCOOH + 2H + cond + 2e - cond → HCHO + H 2 O, HCHO + 2H + cond + 2e - cond → CH 3 OH, PhCH=NH + H 2 O → PhCHO + NH 3(S) , PhCHO + PhCH 2 NH 2 → PhCH=NCH 2 Ph + H 2 O, …”

“…The decrease in photocatalytic efficiency was mainly due to the loss of crystal water in the photocatalyst after use. The mechanism for photocatalytic reduction of CO2 to CH3OH coupling with the conversion of amine to corresponding imine is similar to our previous report [61] as shown in Figure 4. Details are as follows:…”

Synergistic Redox Reaction for Value-Added Organic Transformation via Dual-Functional Photocatalytic Systems

“…42,123,[125][126][127] For example, Yang and co-workers employed the Cu/TiO2 photocatalysts to reduce CO2 into CH3OH and simultaneously oxidize amine to imine under the illumination of UV light (λ = 365 nm). 126 After 15 h of reaction, the optimal photocatalyst of 0.5wt% Cu/TiO2 exhibited the maximum conversion of benzylamine to N-benzylidenebenzylamine (89%) with a high selectivity of 98%, and the CH3OH yield was 961.4 µmol g −1 . The yield of CH3OH and the conversion of amines were affected by different kinds of methylsubstituted benzylamine (at ortho-, meta-, para-positions of the benzene ring).…”

Coupling Strategy for CO2Valorization Integrated with Organic Synthesis by Heterogeneous Photocatalysis

“…In addition to the direct photocatalytic insertion of CO 2 into organic substrates,constructing adual-functional photocatalytic reaction system that pairs CO 2 reduction and oxidative organic synthesis in ac ooperative reaction offers an alternative coupling strategy to achieve the simultaneous valorization of CO 2 and organics.M oreover,t he dual-functional reaction system enables the production of more valuable chemical products in both reduction and oxidation ends simultaneously.S uch dual-functional photocatalytic reaction systems have been constructed and intensively investigated in recent years.T ypical examples include the coupling of CO 2 reduction with alcohol oxidation, the oxidation of unsaturated C À Cb onds,h ydrocarbon dehydrogenation, and the oxidation of amines to imines. [36,56] The dual-functional reaction systems coupling CO 2 reduction with oxidative organic synthesis that are covered in this Review are summarized in Table 2. Cyclohexanone (CH) is an important chemical raw material and the main intermediate for the manufacture of nylon, caprolactam, and adipic acid.…”