Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/134455
Title: DEVELOPMENT OF NICKEL-BASED CATALYSTS FOR HIGH-TEMPERATURE WATER-GAS SHIFT REACTION
Authors: ANG MING LI
Keywords: nickel, copper, ceria, catalyst, water-gas shift, hydrogen
Issue Date: 18-Sep-2015
Source: ANG MING LI (2015-09-18). DEVELOPMENT OF NICKEL-BASED CATALYSTS FOR HIGH-TEMPERATURE WATER-GAS SHIFT REACTION. ScholarBank@NUS Repository.
Abstract: WATER-GAS SHIFT (WGS) REACTION PLAYS A DOMINANT ROLE IN PROMOTING THE IDEAL OF HYDROGEN ECONOMY BY UPGRADING HYDROGEN CONTENT OF SYNGAS. DESPITE ITS HIGH ACTIVITY AND LOW COST, USE OF NICKEL-BASED CATALYSTS IN WGS HAS BEEN PROHIBITIVE DUE TO ITS TENDENCY TOWARDS METHANATION WHICH REDUCES HYDROGEN YIELD. IN THIS WORK, SEVERAL STRATEGIES HAVE BEEN APPLIED TO SUPPRESS METHANATION. THROUGH TECHNIQUES SUCH AS XAS, IN-SITU DRIFTS, XPS, H2/CO-TPR AND XRD, CAUSES OF WGS ACTIVITY AND SELECTIVITY ENHANCEMENT WERE ELUCIDATED. FIRSTLY, FORMATION OF SMALL NI-CU ALLOY THROUGH PROMOTION WITH OLEIC ACID ENHANCED CO ADSORPTION WHICH ACTIVATED HYDROXYLS FOR ENHANCED WGS ACTIVITY. NEXT, ADDITION OF ALKALI METALS (E.G. NA AND K) INCREASED HYDROXYLS CONCENTRATION WHILE STRENGTHENING CO ADSORPTION, THEREBY PREVENTING FORMATION OF SUBCARBONYLS WHICH ARE PRECURSORS FOR METHANATION. LASTLY, NOVEL CUBIC-CEO2@NI-PHYLLOSILICATE@CEO2 CORE-SHELL STRUCTURES WITH INCREASED NICKEL-CERIA INTERFACIAL AREA AND STRONG MET
URI: http://scholarbank.nus.edu.sg/handle/10635/134455
Appears in Collections:Ph.D Theses (Open)

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