Manipulating catalytic activity and durability of Pt-modified Cu–Fe–La/γ-Al₂O₃ ternary catalyst for catalytic wet air oxidation: effect of calcination temperature

Abstract

A series of novel Pt-modified Cu-Fe-La/g-Al 2 O 3 catalysts were prepared by an incipient-wetness impregnation method, and their performances were evaluated in catalytic wet air oxidation (CWAO) of printing and dyeing wastewater (PDW). The as-prepared catalysts were characterized by X-ray photoelectron spectroscopy (XPS), nitrogen adsorption-desorption, X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), Raman spectroscopy, and temperature programmed reduction by hydrogen (H 2 -TPR). The effects of catalyst composition and calcination temperature on the catalytic performance were investigated. The chemical oxygen demand (COD) removal efficiency and decolorization rate are satisfactory over Cu 1.5 Fe 1.5 La 3 /g-Al 2 O 3 catalyst, with poor stability under CWAO conditions. In contrast, catalytic performance and stability of all Pt-modified catalysts are significantly improved. With increasing calcination temperatures from 350 C to 750 C, the activity of the catalysts significantly decreases from 97.3% to 84.6%, and the size of the particles varies from 4.71-6.95 nm. The XRD, HRTEM, and XPS results indicate that the Pt , and the incorporation of Pt increases the binding energies (BEs) of the metal elements in the catalyst, owing to synergistic interactions between the Pt and the Cu, Fe, and La elements. After five cycles, the COD removal efficiency and decolorization rate for PDW over the Pt 1 Cu 1 Fe 1 La 3 /g-Al 2 O 3 catalyst calcined at 650 C remain comparable with the fresh catalyst, indicating that Pt-modified Cu-Fe-La/g-Al 2 O 3 ternary oxide is a promising catalyst with high activity and stability for CWAO treatment. Fig. 1 Influence of components on the activity and stability of catalysts. (a) COD removal efficiency, (b) decolorization rate, (c) metal leaching, ()) Pt

Highly Efficient Ru Supported on Carbon Nanosphere Nanoparticles for Ciprofloxacin Removal: Effects of Operating Parameters, Degradation Pathways, and Kinetic Study

“…Furthermore, for this catalyst dose, the lowest percentage of leached ruthenium (1.5%) was found (Figure b). Similarities with values reported in the literature have been found. − …”

“…In addition, it is noteworthy to highlight that some of the samples corresponding to 110, 120, and 130 °C tests stayed below the detection limit of the equipment (0.2 mg·L –1 ). The found values of leached metal are similar to those reported in the literature. − …”

Constructing Ni–Pt Bimetallic Catalysts for Catalytic Hydrogenation and Rearrangement of Furfural into Cyclopentanone with Insight in H/D Exchange by D2O Labeling

“…The phase purity and crystallinity of all of the reduced and calcined Ni/Al 2 O 3 , Pt/Al 2 O 3 , Ni 1 Pt 0.004 /Al 2 O 3 , Ni 1 Pt 0.007 /Al 2 O 3 , and Ni 1 Pt 0.015 /Al 2 O 3 were analyzed via XRD (Figure ). The XRD patterns of the catalysts show the characteristic 2θ peaks at 19, 32, 38, 39, 45, and 67° corresponding to (101), (112), (103), (202), (220), and (224) planes, respectively, which are attributed to the Al 2 O 3 phase (PDF 01-074-4629). ,− Figure a indicates the NiO phase (PDF 01-080-5508) of calcined Ni/Al 2 O 3 and Ni–Pt/Al 2 O 3 with the diffraction peaks at 37, 44, and 63°, indicating the (111), (200), and (220) planes, respectively . The peaks of calcined Pt/Al 2 O 3 and Ni–Pt/Al 2 O 3 at 32, 37, and 63° correspond to the (111), (222), and (311) planes, respectively, ascribed to the PtO 2 phase (PDF 01-089-3603).…”

NO Reduction by CO over Highly Active and Stable Perovskite Oxide Catalysts La0.8Ce0.2M0.25Co0.75O3 (M = Cu, Mn, Fe): Effect of the Role in B Site

“…In the Fe 2p spectral scope, the major signal of Fe 2p 1/2 and Fe 2p 3/2 exists at 724.1 and 711.3 eV with the shoulder at 717.4 eV, indicating the appearance of Fe 3+ . Moreover, a little signal at 709.9 eV is observed, demonstrating that a large proportion of Fe owns the valence of +3 and a fraction of Fe 2+ coexists in La 0.8 Ce 0.2 Fe 0.25 Co 0.75 O 3 …”