Flexible Co₃O₄/TiO₂ monolithic catalysts for low‐temperature and long‐term stable CO oxidation

Abstract

The development of efficient monolithic catalysts and their fabrication methods for low‐temperature and long‐term stable CO oxidation always remains a challenge for both fundamental research and technological application. In this work, an innovative synthetic strategy to in‐situ integrate Co3O4/TiO2 monolithic catalysts on flexible Ti mesh substrate through multi‐step processes was demonstrated. The in‐situ grown catalysts show strong substrate adhesion, large surface areas and a complete CO conversion temperature of 105°C, which is superior or comparative to most noble metal catalysts. The in‐situ grown Co3O4/TiO2 catalysts on Ti mesh also exhibit excellent long‐term stability that is critically important for industrial application. It is expected that the in‐situ synthesis strategy of well‐defined Co3O4/TiO2 monolithic catalysts on flexible mesh substrate can be extended to the development of a variety of oxide‐based monolithic catalysts towards diverse catalysis applications.

Fabrication of CuO/TiO2/Ti Monolithic Catalyst for Efficient and Stable CO Oxidation

“…More importantly, ultra‐thin TiO 2 nanosheet as support can not only provide high active surface and a large number of oxygen vacancies to achieve high catalytic performance, but also significantly reduce the electron transfer for efficient CO oxidation reaction. [ 38,39 ] Based on this aspect, CuO nanostructures with low price and excellent performance are designed as the main active component to construct CuO/TiO 2 /Ti monolithic catalysts and the specific steps are schematically illustrated in Figure .…”

Preparation and Evaluation of FeMnTi Monolithic Catalysts for High‐Efficiency CO Oxidation

“…Compare with the pure TiO 2 nanosheets (T 100 = 420 °C) and Fe 2 O 3 /TiO 2 catalysts (T 100 = 260 °C), FeMnTi catalysts in this work show excellent lowtemperature CO oxidation performance. [42,56] The influence of Fe/Mn value was also investigated and the results can be seen in Figure 6b. As the same synthesis method and parameters of Fe 2 O 3 /TiO 2 /Ti, the atomic ratio of Fe/Mn can roughly reflect the content relationship of the Fe 2 O 3 and MnO x .…”

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.…”