Interfacial compatibility critically controls Ru/TiO2 metal-support interaction modes in CO2 hydrogenation
Jun Zhou1, Zhe Gao2, Guolei Xiang3
1State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, China.
Interfacial compatibility between ruthenium and titanium dioxide supports critically controls catalytic performance in CO2 hydrogenation. Different annealing conditions tune metal-support interactions, altering product selectivity and conversion efficiency.
Area of Science:
- Materials Science
- Catalysis
- Surface Chemistry
Background:
- Metal-support interactions (MSIs) significantly influence the activity, selectivity, and stability of metal nanoparticle catalysts.
- Understanding the fundamental principles of MSIs is challenging due to the complex interplay of metal and support properties (composition, size, facet).
Purpose of the Study:
- To investigate how metal-support interfacial compatibility governs MSI modes and catalytic performance in CO2 hydrogenation.
- To elucidate the role of different TiO2 polymorphs (rutile and anatase) in modulating these interactions.
Main Methods:
- Utilized Ruthenium (Ru) supported on rutile and anatase TiO2 as model catalysts.
- Employed annealing in air as a method to modify the metal-support interface.
- Analyzed catalytic performance in CO2 hydrogenation, focusing on conversion and product selectivity.
Main Results:
- Annealing Ru/rutile-TiO2 enhanced CO2 to methane conversion due to improved interfacial coupling between RuOx and rutile-TiO2.
- Annealing Ru/anatase-TiO2 decreased CO2 conversion and shifted selectivity to CO, attributed to strong metal-support interaction (SMSI).
- Demonstrated that interfacial compatibility, not just composition, fundamentally alters catalyst behavior.
Conclusions:
- Metal-support interfacial compatibility is a critical factor in controlling MSI strength, catalyst morphology, and surface atomic configuration.
- Tailoring interfacial compatibility offers a powerful strategy to tune catalytic performance in heterogeneous catalysis.
- The choice of TiO2 polymorph (rutile vs. anatase) significantly impacts the outcome of MSI modification via annealing.
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