Naimah Ibrahim
Thumbnail Image
Preferred name
Naimah Ibrahim
Official Name
Ibrahim, Naimah
Alternative Name
Ibrahim, Naimah
Ibrahim, N.
Naimah, I.
Main Affiliation
Scopus Author ID
23767004300
Researcher ID
AAA-9532-2021

Research Output

Filters

2
2
Reset filters

Settings
Now showing 1 - 2 of 2
  • Publication
    Surface alkali promotion of carbon dioxide hydrogenation for conservation of carbon sources: Cyclic voltammetry study
    ( 2020-01-01)
    Tan S.Y.
    ;
    Naimah Ibrahim
    ;
    Umi Fazara Md Ali
    ;
    Sara Yasina Yusuf
    ;
    Aroua M.K.
    Conversion of CO2 captured from biogas upgrading process into useful chemicals or fuels e.g. methane is an attractive route towards conservation of carbon sources. Sustainable hydrogenation route could be achieved by combining the process with hydrogen generated from water electrolysis. In this work, cyclic voltammetry was used as preliminary technique to probe the electrochemical behaviour of Na-modified Pt/YSZ as model catalyst under CO2 hydrogenation. The reaction is irreversible and the voltammogram features are not easily distinguishable under reaction conditions. The increase in cathodic peak height and the decrease in peak potential with addition of sodium at low coverage (0.32%) indicated that the charge transfer reaction was enhanced and thus the methanation reaction could be electrochemically promoted given sufficient amount of H2 flow. However, increasing Na coverage was found to decrease the current hysteresis possibly due to formation of sodium compounds such as carbonates or oxides that populate the three-phase-boundary (tpb) active sites, thus deactivating the catalyst.
      1
  • Publication
    Carbon dioxide hydrogenation using Ru/YSZ promoted with low-coverage alkaline earth metals
    ( 2020-07-09)
    Sze Yen T.
    ;
    Naimah Ibrahim
    ;
    Umi Fazara Md Ali
    ;
    Kheireddine Aroua M.
    Utilization of CO2, which is the main contributor to the global climate change is one of the means to produce useful chemicals and fuels while at the same time reduce CO2 concentration in the atmosphere. Ruthenium (Ru) was chosen as the probe catalyst in carbon dioxide hydrogenation based on its ability to selectively enhance methanation reaction. Ru supported on YSZ solid electrolyte (Ru/YSZ) was modified with alkaline earth metal promoters i.e. calcium (Ca) and magnesium (Mg) at low coverage (0.16%). It was found that Ca-modified system is more favorable to enhance the catalytic activity and selectivity of reaction towards methane production compared to Mg-modified system, perhaps due to the higher basicity of Ca.
      1