Effect of Acid Treatment on the Catalytic Activity and Mechanical Stability of SmMnO₃/Cordierite Monolithic Catalysts

Abstract

SmMnO 3 /cordierite monolithic catalysts were synthesized by a modified citric acid method and treated with dilute HNO 3 , which was used to explore the effect of acid treatment on the catalytic performance and mechanical stability of the monolithic catalysts. Firstly, acid treatment can significantly improve catalytic activity of catalyst in o-xylene oxidation, which is attributed to the increase of the specific surface area of the catalyst and the change of surface oxygen species. A series of single factor experiments show that the SmMnO 3 /cordierite monolithic catalyst treated by 1.0 mol/L HNO 3 for 6 h and calcined at 450°C for 1 h has the best performance. Furthermore, the mechanical stability of the catalysts treated by dilute HNO 3 was tested, which show that too long acid treatment time and too high acid concentration will reduce the mechanical stability of the catalyst and 1.0 mol/L HNO 3 treatment for 1 h is the best. Different calcination temperature and calcination time will also affect the mechanical stability of the catalyst. Finally, the catalyst has good stability of catalytic performance and mechanical stability.

Study on the Adsorption Properties of Oxalic Acid-Modified Cordierite Honeycomb Ceramics for Neutral Red Dyes

“…38 In one study, the monolithic catalysts of diatomite-modified wood ceramics have been widely used for the adsorption of pollutants due to their large specific surface area, strong adsorption capacity, and lower cost. 39 Compared to conventional pellets or powder catalysts, which have the drawbacks of a low recycling rate and difficult recovery in an aqueous solution, cordierite honeycomb ceramics (COR), which have a high specific surface area, 40 high permeability, high adsorption capacity, relatively high mechanical strength, 41,42 inherent high porosity, 43 and low cost, were chosen as adsorbents. 44,45 In this paper, oxalic acid was used to simply modify cordierite honeycomb ceramics (CORA), and the effectiveness of NR dyes in solution adsorption was assessed.…”

“…Compared to conventional pellets or powder catalysts, which have the drawbacks of a low recycling rate and difficult recovery in an aqueous solution, cordierite honeycomb ceramics (COR), which have a high specific surface area, high permeability, high adsorption capacity, relatively high mechanical strength, , inherent high porosity, and low cost, were chosen as adsorbents. , In this paper, oxalic acid was used to simply modify cordierite honeycomb ceramics (CORA), and the effectiveness of NR dyes in solution adsorption was assessed. In the study of pollutant removal from NR-contaminated wastewater, the materials’ rate of utilization was not only improved, but the results were also satisfactory.…”

Catalytic Activity and Mechanical Stability of ZIFs‐Derived CoCeOx/Cordierite Monolithic Catalysts

“…Finally, CuÀ Mn and ZSM-5 zeolite layers were loaded on cordierite matrix by co-impregnation method, and the catalyst obtained had good o-xylene catalytic activity. Bao et al [30] loaded SmMnO 3 perovskite onto cordierite by dipping method, and investigated the effect of acid treatment concentration and time on catalytic activity and mechanical stability. The longer the acid treatment time, the worse the mechanical stability of the catalyst coating, and the better the catalytic activity.…”