In Situ Grown Monolithic Au/TiO₂ Catalysts on Flexible Ti Mesh for Efficient Low‐Temperature CO Oxidation

Abstract

The development of advanced catalyst integration strategy is of great importance and promising for long‐term and stable gas catalysis in environmental processing. However, conventional catalyst fabrication techniques including spray method and spin coating cannot overcome the key problems of catalyst peeling off from substrate and related severe performance degradation. In this work, an in situ integration strategy of monolithic Au/TiO2 catalysts on Ti mesh for efficient and stable low‐temperature CO oxidation is reported. Plasma electrolytic oxidation technology can create a porous TiO2 seeding layer with strong substrate adherence. Subsequent hydrothermal reaction, ion exchange, and calcination processes can induce the in situ nucleation of sodium titanate nanosheets and their follow‐up conversion to TiO2 nanosheets with huge surface area. The oxygen defects generated in anatase TiO2 nanosheet supports can not only provide sufficient anchoring sites for the deposition and attachment of gold nanoparticles (Au NPs) during deposition–precipitation process, but also absorb and activate oxygen species. Meanwhile, the strong interactions between Au NPs and TiO2 support make the catalysts more chemically active. As a result, the Au/TiO2 monolithic catalysts can eliminate CO completely at low temperature and exhibit considerably high stability, suggesting their potential in practical applications.

Flexible Ti Mesh-Supported MnOx–CuOx/TiO2 Nanosheet Monolithic Catalysts for Low-Temperature Selective Catalytic Reduction of NOx with NH3

“…The typical synthetic procedures of the H 2 Ti 2 O 5 /Ti support involved a series of reaction steps, which included PEO, hydrothermal reaction, and ion exchange, which were systemically reported in our previous works. − Mn and Cu active species were loaded onto the H 2 Ti 2 O 5 /Ti supports by using a simple coprecipitation method. A solution containing 30 mmol of Mn­(NO 3 ) 2 and Cu­(NO 3 ) 2 in 50 mL of ultrapure H 2 O was prepared, followed by the addition of 50 mL of a 30 mmol/L NaHCO 3 solution as the precipitating agent.…”

“…In this work, we propose a synthetic strategy of monolithic catalysts, including plasma electrolytic oxidation (PEO), hydrothermal, and coprecipitation methods, to address the above issues. First, TiO 2 nanosheet arrays with robust substrate adhesion and a large surface area were in situ-prepared on flexible Ti mesh, as reported in our previous works. − Then, highly dispersed Cu–Mn active components with excellent synergistic effects were loaded in situ onto the surface of TiO 2 supports to promote catalytic activity and durability. It has been demonstrated that the flexible Ti mesh-supported MnO x –CuO x /TiO 2 nanosheet monolithic catalysts could realize high NO x conversion and N 2 selectivity in the wide operating temperature range of 145–300 °C with excellent resistance to H 2 O and good recoverability after SO 2 poisoning.…”

In situ fabrication of Cu–Mn–O nanostructure catalysts on Ti mesh and their catalytic property optimization for low-temperature and stable CO oxidation

“…During this process, the electrolyte solution temperature is controlled below 25 °C by the cooling system to maintain the good oxidation quality of porous TiO 2 film. Detailed PEO process of Ti anode can be found in our previous works [15][16][17]. To synthesize Cu-Mn-O catalysts, the Ti mesh covered with rough TiO 2 film is inserted into an autoclave filled with mixed solution of Cu(NO 3 ) 2 , KMnO 4 and urea with a total concentration of 0.06 M in 40 ml and a molar ratio of Cu: Mn = 0:1, 2:1, 1:2 and 1:0, and the hydrothermal reaction to synthesize Cu-Mn-O catalysts is carried out at 150 °C for 6, 12 and 18 h to investigate any possible morphology evolution.…”

Two‐Dimentional Nanostructured Metal Oxide/Sulfide–Based Photoanode for Photoelectrochemical Water Splitting

“…This method has been applied to fabricate many 2D metal oxides/sulfides for PEC water splitting, such as Zn 1− x Cd x S [ 52 ] and TiO 2 . [ 53–56 ]…”