Selective catalytic reduction of sulfur dioxide to elemental sulfur. Final report Page: 5 of 174
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Contents
1 Introduction .......................................................................................................1
1.1 Project Objective and Outline ...........................................................................1
1.2 Background.......................................................................................................1
1.2.1 Old Problems and New Challenges-Flue Gas Desulfurization (FGD).....1
1.2.2 Previous and Ongoing Studies of Catalytic Reduction
of Sulfur Dioxide to Elemental Sulfur.....................................................3
1.3 Formulation of a N ovel Catalyst System ........................................................ 4
1.3.1 Catalyst Formula ...................................................................................4
1.3.2 Main Reactions Studied in This Project..................................................5
1.3.3 Scientific Rational..................................................................................5
1.4 Outline of Present Research Approach ..............................................................7
1.5 Literature Cited ................................................................................................8
2 Experimental.......................................................................................................12
2.1 Catalyst Preparation ........................................................................................12
2.1.1 Precursors ..........................................................................................12
2.1.2 Complexation Method with Citric Acid ..............................................12
2.1.3 Coprecipitation ..................................................................................13
2.1.4 Catalyst Support and Impregnation ....................................................14
2.1.5 Nanocrystalline Catalysts ...................................................................14
2.2 Catalyst Characterization.................................................................................15
2.2.1 Compositional Analysis .......................................................................15
2.2.2 Surface Area, Pore Size, and Metal Dispersion ....................................15
2.2.3 X-ray Powder Diffiaction (XRD) ........................................................17
2.2.4 Spectroscopic Studies .........................................................................18
2.3 Apparatus and Procedure ................................................................................20
2.4 Literature Cited ..............................................................................................21
3 Reduction of SOZ by CO to Elemental Sulfur over Ceria Catalysts ..30
3.1 Introduction ....................................................................................................30
3.2 Experimental.............................................................................................. 30
3.3 Results and Discussion ....................................................................................31
3.3.1 CeO2 Catalyst ......................................................................................31
3.3.2 Doped CeO2 Catalysts .........................................................................31
3.3.3 CeO2(La) Catalyst ...............................................................................33
3.3.4 Water Vapor Effects ...........................................................................34
3.3.5 CeO2(La) Is an Active Catalyst for Claus Reaction
and COS Hydrolysis ............................................................................34
3.4 M echanistic Consideration ..............................................................................35
3.5 Conclusions ....................................................................................................37v
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Liu, W.; Flytzani-Stephanopoulos, M. & Sarofim, A.F. Selective catalytic reduction of sulfur dioxide to elemental sulfur. Final report, report, June 1, 1995; Cambridge, Massachusetts. (https://digital.library.unt.edu/ark:/67531/metadc624197/m1/5/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.