Synthesis and Characterization of a Carbon‐Supported Cobalt Nitride Nano‐Catalyst

Abstract

Transition metal nitrides have attracted great interest among the non‐noble catalysts employed in heterogeneous catalytic processes because of their exceptional stability and catalytic potential. However, the approach for their synthesis has remained a tremendous challenge. This study presents the synthesis of Co4N/C catalyst fabricated at 400, 600, and 800 °, symbolized as Co4N/C‐400, Co4N/C‐600, Co4N/C‐800, respectively. The characterization of fabricated catalysts is carried out through various advanced analytical techniques. As prepared nano‐catalyst Co4N/C shows remarkable catalytic efficiency in terms of low activation energy (Ea=3.038×10−1 KJ mol−1), fast conversion rate (Kapp=0.2884 s−1), and 97.57% conversion efficiency. Moreover, it also exhibits excellent stability and reusability because of its metallic characteristics. The outstanding catalytic activity of the catalyst is the combined effect in which the Co4N nanoparticles acted as active sites, and the carbon support doped with nitrogen provided an expressway for the transport of electrons required for catalytic reduction. Moreover, the designed catalyst is immobilized on the cellulose membrane filter support, to demonstrate the catalytic reduction of 4‐nitrophenol to 4‐aminophenol. We envision that our work would facilitate the fabrication of cobalt nitrides‐based nano‐catalysts for a wide range of industrial applications.

Cobalt‐based Co3Mo3N/Co4N/Co Metallic Heterostructure as a Highly Active Electrocatalyst for Alkaline Overall Water Splitting

“…In Figure 2c, all the samples show a peak at 26°, which can be attributed to the (002) plane of graphitic carbon (PDF#75‐0444) [22] . In Figure S5, for Co 4 N/Co, the diffraction maxima at 35.5°, 44°, 52°, and 76° match well with the cubic phase of Co 4 N with the space group Pm3 m (ICDD 04–021‐6262), [10] indicating its presence in the sample. However, the peaks at 44°, 52° and 76° are slightly shifted compared to Co 4 N and are between the main peaks of cubic cobalt and Co 4 N, indicating that Co 4 N and Co can be present at the same time.…”

Nanoparticles of Cobalt for the Reversible (De)Hydrogenation and Oxidative Dehydrogenation of N-Heterocycles under Mild Conditions

“…34,35 In the Fourier transform infrared (FT-IR) spectra of Co-L1(1:4.5)@C-800, the characteristic Co−N x stretching bands were observed at 558 cm −1 , which is in accordance with the reported literature value. 37 Further, the TEM study revealed that the Co-L1(1:4.5)@C-800 material consisted of an average particle size of 12.54 nm (ranging from 4 to 24 nm; Figure 1g,h). The high-resolution TEM image exhibited a wellresolved lattice spacing of 0.204 nm corresponding to the Co(111) plane (Figure 1i).…”

“…In the deconvoluted nitrogen N 1s XPS spectra, three peaks were observed, which indicated the presence of pyridinic-type (398.2 eV), pyrrolic-type or Co–N x (399.1 eV), and graphitic-type (401.2 eV) nitrogen in the material (Figure d) . In the deconvoluted O 1s spectrum, three peaks centered at 531.5 eV (CO), 532.8 eV (–C–O), and 535.2 eV (–OH or H 2 O) (Figure e) were observed. , In the Fourier transform infrared (FT-IR) spectra of Co-L1(1:4.5)@C-800, the characteristic Co–N x stretching bands were observed at 558 cm –1 , which is in accordance with the reported literature value . Further, the TEM study revealed that the Co-L1(1:4.5)@C-800 material consisted of an average particle size of 12.54 nm (ranging from 4 to 24 nm; Figure g,h).…”

Recent Progress in Microfiltration/Ultrafiltration Membranes for Separation of Oil and Water Emulsions

“…Several photoactive materials are famous for photocatalysis application of degradation of the organic pollutants. The catalytic membranes have also shown promising potential to degrade or convert the organic contamination to valuable products [250,251] …”

“…The catalytic membranes have also shown promising potential to degrade or convert the organic contamination to valuable products. [250,251] Figure 25. Cross-section and outer surface SEM images of the membranes sintered at 1350 °C and produced with pure and mixed SiC and Si powders as starting ceramic materials:, and Visual aspect and microscopic photographs of the water/oil emulsion before and after the filtrations through the HF-SiC70Si30 membrane.…”