Hydrothermal Synthesis of a Novel Double‐Sided Nanobrush Co₃O₄ Catalyst and Its Catalytic Performance for Benzene Oxidation

Abstract

A double‐sided nanobrush Co3O4 (Co3O4−B) catalyst was successfully prepared by a hydrothermal method for the first time, and Co3O4 rods (Co3O4−R), Co3O4 hexagonal plates (Co3O4−H) and Co3O4 double‐sided helianthus discs (Co3O4−D) were also synthesized through tuning the water/ethanol ratio. Among all of the as‐prepared catalysts, the Co3O4−B catalyst exhibited the best catalytic activity for benzene oxidation. The excellent catalytic performance could be attributed to the surface abundance Co3+ species, good low‐temperature reducibility and high number of lattice defects with substantial active oxygen species, which resulted from the unique structure of the double‐sided nanobrush. The stability and water tolerance tests demonstrated that the Co3O4−B catalyst displays excellent stability for benzene combustion, and the deactivation caused by water vapor is also reversible. It is concluded that the unique structure of the catalysts plays a crucial role in determining its catalytic oxidation performance.

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“…Moreover, toluene conversion could be recovered to the initial conversion after the water vapor was cut off, because the H 2 O molecule was easily desorbed from the surface of catalysts at high temperature. Thus, the deactivation caused by water vapor is reversible …”

“…Figure 3d shows the Thus, the deactivation caused by water vapor is reversible. 23 3.3. Chemical State and Electronic Properties.…”

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“…Among them, catalytic oxidation has been considered one of the most promising technologies because it can completely convert VOCs under relatively low temperatures (<400 • C) into harmless CO 2 and H 2 O with low energy consumption, which has gained a lot of attention either in scientific and industrial fields. The key issue of catalytic oxidation is to design catalysts with high catalytic activity and low cost [6,7].…”

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