Synthesis and Experimental Study of Bimetallic Nanocatalysts for the Preferential Oxidation of CO in Hydrogen Flow

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Zare, Zahra | 2018

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 50633 (06)
University: Sharif University of Technology
Department: Chemical and Petroleum Engineering
Advisor(s): Khorasheh, Farhad; Khodadadi, Abbas Ali; Mortazavi, Yadollah
Abstract:
In this investigation, silica-based iron-metal catalyst was synthesized by the Atomic layer deposited (ALD) method with iron-acetylate (Fe(acac)3) as a precursor in different loading dosages. The synthesized catalyst were characterized by nitrogen absorption and excretion (BET), by Field Emission Scanning Electron Microscope (FESEM), X-ray diffraction (XRD), and Temperature-Programmed Reduction (TPR), Fourier-transform infrared spectroscopy (FTIR), Atomic Emission Spectroscopy (ICP) etc.
The temperature range of 180 to 200 °C was determined for the self-limited chemisorption of Fe(acac)3 on the silica surface as the first and the most important step in a single atomic cycle. Also the enough time for the self-limited chemisorption and oxidation of the acetyl acetate residual ligands in air, through the monitoring of the reactor outlet gases by an infrared spectrometer analyser. After that the catalyst was coated 5 wt% Au metal by incipient wet impregnation method. The catalytic activity of the Au-Fe/SiO2 catalyst has been investigated by the PROX process, which at a temperature of 140 °C the highest conversion value is 60%
Keywords:
Bimetallic Catalyst ; Gold ; Iron ; Preferential Co Oxidation (Prox) ; Atomic Deposition

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