Recent advances in heterogeneous selective oxidation catalysis for sustainable chemistry

Abstract

Oxidation catalysis not only plays a crucial role in the current chemical industry for the production of key intermediates such as alcohols, epoxides, aldehydes, ketones and organic acids, but also will contribute to the establishment of novel green and sustainable chemical processes. This review is devoted to dealing with selective oxidation reactions, which are important from the viewpoint of green and sustainable chemistry and still remain challenging. Actually, some well-known highly challenging chemical reactions involve selective oxidation reactions, such as the selective oxidation of methane by oxygen. On the other hand some important oxidation reactions, such as the aerobic oxidation of alcohols in the liquid phase and the preferential oxidation of carbon monoxide in hydrogen, have attracted much attention in recent years because of their high significance in green or energy chemistry. This article summarizes recent advances in the development of new catalytic materials or novel catalytic systems for these challenging oxidation reactions. A deep scientific understanding of the mechanisms, active species and active structures for these systems are also discussed. Furthermore, connections among these distinct catalytic oxidation systems are highlighted, to gain insight for the breakthrough in rational design of efficient catalytic systems for challenging oxidation reactions.

Heterogeneously catalyzed lignin depolymerization

“…This approach has been applied to wood pulp delignification, in which oxidation of the C a alcohol to a ketone favours the breakdown of b-O-4 linkages. Wang et al [85] also reported a bifunctional Pd/CeO 2 catalyst able to efficiently cleave b-O-4 bonds in the presence of C a -hydroxyl group, in which synergy between palladium activation of the oxidant and the redox properties of ceria facilitates b-O-4 cleavage; Pd is widely used in heterogeneous catalysis for aerobic alcohol oxidation [86][87][88][89][90]. This bifunctional catalyst was able to transform a range of Organosolv lignin in ethanol under oxygen to vanillin, guaiacol, and 4-hydroxybenzaldehyde.…”

CuII(Sal-Ala)/CuAlLDH Hybrid as Novel Efficient Catalyst for Artificial Superoxide Dismutase (SOD) and Cyclohexene Oxidation by H2O2

“…The design of heterogeneous oxidation catalysts by the molecular control of the active species and their uniform distribution into a controlled environment might allow finetuning of the catalytic features in order to improve the reactivity, selectivity and potential applications [1]. By analogy with naturally occurring Fe-or Cu-containing metalloenzymes, both the structure of the metal sites and the environment of their vicinities must be controlled [2].…”

Utilization of Volatile Organic Compounds as an Alternative for Destructive Abatement

“…One of the strategies in the C-H bond activation is the catalytic oxidation process. Oxidation process is one of the most viable, easy and efficient methods in VOC abatement and utilization technologies [95]. One of the commercially applied conversion technology is the catalytic methane combustion (CMC) (in the form of LNG and/or CNG) in automotive applications.…”