Effect of CaO, Al 2 O 3 , and MgO Supports of Ni Catalysts on the Formation of Graphite-like Carbon Species during the Boudouard Reaction and Methane Cracking.
Artem KaporovOleksandr ShtykaRadoslaw CiesielskiAdam KedzioraWaldemar ManiukiewiczMalgorzata Iwona Szynkowska-JozwikYelubay MadeniyetTomasz ManieckiPublished in: Materials (Basel, Switzerland) (2023)
The investigation of the course of the Boudouard reaction and methane cracking was performed over nickel catalysts based on oxides of calcium, aluminum, and magnesium. The catalytic samples were synthesized by the impregnation method. The physicochemical characteristics of the catalysts were determined using atomic adsorption spectroscopy (AAS), Brunauer-Emmett-Teller method analysis (BET), temperature-programmed desorption of ammonia and carbon dioxide (NH 3 - and CO 2 -TPD), and temperature-programmed reduction (TPR). Qualitative and quantitative identification of formed carbon deposits after the processes were carried out using total organic carbon analysis (TOC), temperature-programmed oxidation (TPO), X-ray diffraction (XRD), and scanning electron microscopy (SEM). The selected temperatures for the Boudouard reaction and methane cracking (450 and 700 °C, respectively) were found to be optimal for the successful formation of graphite-like carbon species over these catalysts. It was revealed that the activity of catalytic systems during each reaction is directly related to the number of weakly interacted nickel particles with catalyst support. Results of the given research provide insight into the mechanism of carbon deposit formation and the role of the catalyst support in this process, as well as the mechanism of the Boudouard reaction.
Keyphrases
- carbon dioxide
- electron microscopy
- metal organic framework
- highly efficient
- high resolution
- anaerobic digestion
- room temperature
- transition metal
- reduced graphene oxide
- electron transfer
- oxide nanoparticles
- ionic liquid
- crystal structure
- systematic review
- mass spectrometry
- nitric oxide
- genetic diversity
- carbon nanotubes
- single cell
- magnetic resonance