Thermocatalytic and photocatalytic chemoselective reduction of cinnamaldehyde to cinnamyl alcohol and hydrocinnamaldehyde over Ru@ZnO/CN

Abstract

The selective hydrogenation of unsaturated carbonyl compounds requires a catalyst with a suitable combination of support and active sites to activate a specific functional group. In this work, ZnO and...

Co–Ti Bimetallic Complex-Induced Phase Modulation of Co@Black TiO2 for Catalytic Hydrogenation of Cinnamaldehyde

“…Moreover, the η4 adsorption mode significantly aids this reaction, leading to the production of a mixture of HCAL, COL, and HCOL from CAL hydrogenation. , Therefore, catalyst modification is crucial to enhance selective CO bond hydrogenation for achieving exclusive selectivity to specific target products. Although there are reports of selective hydrogenation of CAL to a particular product with a noble/non-noble metal catalyst, controlling reaction efficiency and selectivity to a particular hydrogenated product in the presence of monometallic catalysts is a challenging task. − Among few notable contributions in this regard the Yang and Liu group has made significant contributions to this field by developing a metal–organic framework (MOF) based monometallic catalyst (Co) as well as a bimetallic catalyst (Co–Mo, Co–W, and Co–Pt) and achieved high selectivity toward COL under optimal reaction conditions. , However, achieving maximum activity and selectivity with these non-noble metal-based catalysts still remains a challenge. Next, to assess the catalytic activity of the synthesized materials, we selected cinnamaldehyde (CAL) as a model substrate for hydrogenation.…”

Selective Hydrogenation of Cinnamaldehyde, Furanic, and Aromatic Aldehydes over a Z-Scheme Heterojunction Photocatalyst Constituted of Pd NPs Supported on g-C3N4/ZnO Nanocomposite

“…It underlies the amplified activity observed in g-C 3 N 4(0.73) /ZnO (0.27) . The synthesized g-C 3 N 4(0.73) /ZnO (0.27) nanocomposite is Z-Scheme, which was proved and reported in our previous report through some control studies such as NBT and THA test (also conducted for present work (Figure S13a,b)). The results of these studies indicate that the heterojunction is a Z-Scheme type instead of a conventional Type-II (Figure c).…”

“…The process of synthesizing g-C 3 N 4 and ZnO, a protocol that had been previously documented, was employed (see Supporting Information). , The systematic method of synthesizing Z%Pd@g-C 3 N 4( x ) /ZnO ( y ) nanocomposites is provided in Figure . To fabricate the composites of g-C 3 N 4( x ) /ZnO ( y ) in fixed ratios, thermal analysis was considered (Figure S1), for which a discussion is provided in Supporting Information (SI).…”

“…27 Recently, our group has reported a 1%Ru@ZnO(1.5)/CN for the thermocatalytic selective hydrogenation of CNM to CNMA with 85% selectivity (96% CNM conversion) with HCOOH as a hydrogen donor and 4%Ru@ZnO(1.5)/CN afforded 99% yield for HCNMA under photocatalytic conditions in isopropanol employing 2 bar H 2 . 28 The novelty of this study is that it employed 0.5%Pd@g-C 3 N 4(0.73) / ZnO (0.27) for the CNM to HCNM with ∼99% yield and 3% Pd@g-C 3 N 4(0.73) /ZnO (0.27) for the CNM to HCNMA with ∼99% yield under photocatalytic conditions in IPA employing 2 bar H 2 . Another novelty is that the catalyst exhibited selective −CHO reduction or ring reduction and −CHO reduction of furanic aldehydes just by varying the Pd contents.…”

Advancing sustainable lignin valorisation: utilizing Z-scheme photocatalysts for efficient hydrogenolysis of lignin's β-O-4, α-O-4, and 4-O-5 linkages under ambient conditions

“…The presence of metallic components had a minimal impact on the surface area of the composite, likely due to the additional N 2 adsorption sites facilitated by the presence of Pd NPs. 42,43 The details of the surface area and total pore volume for the catalysts are comprehensively outlined in Table S2. † and (d and e) CN/rGO/BMO(2 : 1) composite, HR-TEM images (f ) BMO and (g) CN, (h-l) 3%Pd@CN/ rGO/BMO(2 : 1) and (m-r) elemental mapping of 3%Pd@ CN/rGO/BMO(2 : 1).…”