Biomass-derived carbon-based functional materials have seen remarkable progress in recent years, especially in the field of heterogeneous organic catalysis, which is now a rapidly growing research frontier. In this context,...
Herein, we report a novel and efficient (Al,Mn)P-NiSR electrocatalyst with enriched O/Al vacancies and diverse metal oxyhydroxides including NiOOH and MnOOH prepared by the Al/Mn bimetals-modulated reconstruction of the as-prepared...
This review develops a route-resolved framework linking Lewis acid–base cooperation, evidence, water management, and process translation toward CO 2 -to-GC synthesis.
A palladium catalyst supported on porous poly(p-phenylene sulfide) (Pd(0)/PPS) was developed for the chemoselective hydrogenation of alpha,beta-unsaturated carbonyl compounds. Uniformly dispersed Pd nanoparticles (2.86 +/- 0.76 nm) on the PPS support selectively hydrogenated C = C bonds to afford the corresponding saturated carbonyl compounds in good to excellent yields without the use of soluble catalyst poisons. In contrast to conventional Pd/C, Pd(0)/PPS effectively suppressed over-hydrogenation of the carbonyl group and maintained high selectivity under low catalyst loading (maximum turnover number (TON) = 960, maximum turnover frequency (TOF) = 37 h(-1)) and even under atmospheric hydrogen pressure. The catalyst exhibited broad substrate scope, including alpha,beta-unsaturated ketones and cinnamic acid derivatives. Importantly, Pd(0)/PPS showed a markedly higher ignition temperature (510 degrees C) than commercial Pd/C (<200 degrees C) and exhibited no spontaneous ignition after hydrogenation. These results demonstrate that PPS is an effective support for achieving both chemoselective hydrogenation and enhanced catalyst safety.
Utilizing mild photocatalytic lignin cleavage to produce high-value aromatic chemicals is an important pathway to address the global fossil resource shortage and achieve sustainable development. Achieving the efficient and precise depolymerization of the C alpha-C beta bonds in lignin is considered a major challenge. This article successfully synthesized a sandwich-like, N-Nb2O5/Na-C3N4 type-II heterojunction using element-doping and heterojunction-modification strategies and used it to selectively depolymerize the C alpha-C beta bonds in beta-O-4 model compounds under simulated sunlight. The characterization results and mechanism studies indicate that the light absorption range is expanded and enhanced, the e--h+ pair separation efficiency is improved and the oxidation-reduction ability is enhanced. Heterojunctions mainly generate & centerdot;O2-, which is the most effective free radical for cleaving the C alpha-C beta bonds. The optimized heterojunction system significantly enhances the conversion rate of the cleavage reaction, which is 4.49 times that of Nb2O5 and 2.14 times that of C3N4, achieving 97% selectivity for the C alpha-C beta bond cleavage. This study provides a new paradigm for constructing efficient lignin depolymerization catalysts.
