LOGO Water Gas Shift Reaction Over Au/Ce x Ti y O 2 Cheng Wan.

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Presentation transcript:

LOGO Water Gas Shift Reaction Over Au/Ce x Ti y O 2 Cheng Wan

Objective To investigate the structural properties and chemical activity of a potential catalyst (Au supported on Ce x Ti y O 2 ) for water gas shift (WGS) reaction.

CO Oxidation WGS CH 4 + H 2 O → CO 2 +CO + H 2 CO + H 2 O  CO 2 + H 2 CO + 1/2O 2  CO 2 Steam Reforming Hydrogen Production CO removal H 2 production Pure Clean H 2 Fuel Cell

Catalysts for WGS "Gold catalysts for pure hydrogen production in the water?gas shift reaction: activity, structure and reaction mechanism" H 2 O + CO O H H CO OH H CO 2 + H 2 Metal Oxide Support Reaction mechanism ZnO Fe 2 O 3 CeO 2 TiO 2 Al 2 O 3 Factors Influence the reactivity Metal Support Structure... Metal Supported on Oxide Metal / Oxide Au Pt Pd Rh... CeO 2 Redox Properties Oxygen Storage Capacity Ti-doped Ceria Enhance the stability and reactivity. Au/Ce x Ti y O 2

Structure Study Catalysts Synthesis Catalytic Activity Test Approach Sol – Gel Deposition Precipitation X-ray Diffraction (XRD) GC-MS MS:Mass Spectrometer GC:Gas Chromatograph

Structure Characterization Mixed oxides Ce x Ti y O 2-z have been synthetized successfully. Composition of metals in the mixed oxides affects the oxides' structures. XRD Patterns TiO 2 CeO 2

Catalysts Preparation Precursors Sols Gels Ce x Ti y O 2 1. Sol-Gel MethodPreparation for Ce x Ti y O 2 Mixed Oxides 2. Deposition Precipitation Method Au/Ce 0.5 Ti 0.5 O 2 Au/Ce 0.67 Ti 0.33 O 2 Au/Ce 0.8 Ti 0.2 O 2 Preparation for Au/Ce x Ti y O 2 Catalysts

Catalytic Activity Flow diagram of WGS test Au/CeO 2-z Au/ Ce 0.8 Ti 0.2 O 2-z Au/Ce 0.67 Ti 0.33 O 2-z Au/Ce 0.5 Ti 0.5 O 2-z CO 23.2%, H 2 O 61.8%, N 2 15% Reactor Au/Ce x Ti y O 2-z GC-MS CO, H 2 O, CO 2, H 2, N 2 H 2 O + CO Au Ce x Ti y O 2

Conclusions  Au/Ce x Ti y O 2-z catalysts were prepared.  Composition of metals in the mixed oxides affects the structures of oxides.  Au/Ce x Ti y O 2-z shows catalytic activity in WGS reaction.  Method of mixed oxides preparation need be improved in the future research.

Accoknowledge  EPSCoR  Dr. Jing Zhou  Dr. Tang and Dr. Shao Jiu  Dr. Fan and Ms. Ying Li  Dr. Yinghui Zhou and Mr. Rajendra Kumar Mahat

LOGO

Sol - Gel Method: xCe(NO 3 ) 3 ·6H 2 O+yTi(OC 3 H 7 ) 4 =Ce x Ti y O 2 +N 2 +CO 2 +H 2 O Dissolve Precursor Solution Sol Gel Hydrolysis Poly- condensation Effect of age

1. Beaker 2.Solution 3. Stir bar 4. Magnetic stirring apparatus 5. Temperature controller 6. Stirring speed adjustor 7. Thermometer Ce x Ti y O 2 + HAuCl Deposition Precipitation Method HAuCl 4 AuCl 3 / AuCl Au(OH) 3 / AuOH Au 2 O 3 /Au 2 O Au 1 atm pH=7 T=70 o C HAuCl 4 (Gold(III) chloride)+Ce x Ti y O 2 → Au/Ce x Ti y O 2