Niamat Ullah

Tianjin University, China

Abstract Title:Morphology-Dependent Properties of Nanostructured Ni/CeO2-NdO2 Catalysts for CO2 Methanation

Biography:

It is my pleasure to introduce myself as Niamat Ullah. Currently, I am a Post doctorate at Tiangong University (School of Material Science & Engineering). I completed my master's degree and Phd degree in chemical engineering at Tianjin University (School of Chemical Engineering & Technology) in the years 2017-2019 and phd from 2019 to 2023. My research interests focus on the hydrogenation of CO2 into value-added chemicals such as methane (CH4) and C2+ hydrocarbons.

Research Interest:

In this study, CeO2-NdO2 nanorod (NR), CeO2-NdO2 nanopolyhedral (PH), CeO2-NdO2 nanoparticle (NP) were prepared via modified hydrothermal methods. The 5%Ni/CeO2-NdO2 catalysts were prepared by incipient wetness impregnation method and were tested for CO2 methanation at reaction temperature ranging from 250 degrees to 450 degrees. The catalytic tests showed that the catalyst supported on the CeO2-NdO2 nanopolyhedra (5Ni/CeNd-PH) exhibited much higher catalytic activity and better stability than the catalysts supported on the CeO2-NdO2 nanorod and CeO2-NdO2 nanoparticle. The excellent catalytic activity of the Ni/CeO2-NdO2 nanopolyhedral should be attributed to the synergistic effect of medium strength surface basicity, medium metal-support interaction, high dispersion of metallic Ni active sites and abundant oxygen vacancies which are associated with their exposed {111}, {100} and {110} planes. The TEM, XRD, CO2-TPD, H2-TPR and Raman characterization results confirmed that the metal support interaction (MSI) and associated oxygen vacancy concentration were modulated by varying CeO2-NdO2 morphologies. H2-TPR analysis showed that the strong metal-support interaction (SMSI) between Ni and CeO2-NdO2-NP of the 5Ni/CeO2-NdO2 -NP catalyst had an adverse effect on CO2 conversion while the medium metal support interaction between Ni and CeO2-NdO2-PH of the Ni/CeO2-NdO2 -PH catalyst had a positive effect on CO2 conversion. Moreover, HRTEM results showed that the CeO2-NdO2 nanopolyhedral (PH), predominantly exposed {111}, {100} and {110} planes, which contributed to its superior catalytic performance over other morphological CeO2-NdO2 supported Ni catalysts.