研究目的
Investigating the effect of acidic and alkaline synthesis conditions on Au nanoparticles supported on nanorod-like TiO2 as catalysts in the CO-PROX reaction under dark and light irradiation.
研究成果
The acidic synthetic approach produced well-defined rutile nanorods with regular gold nanoparticle distribution, leading to high activity and selectivity in the CO-PROX reaction, especially under light irradiation. The sample calcined at 700°C showed the best performance with 100% selectivity to CO2. These nanostructured materials are promising for efficient CO removal in hydrogen-rich streams for transportation applications.
研究不足
The study is limited to specific synthesis conditions (acidic and basic hydrothermal methods) and calcination temperatures. The catalysts were tested only at room temperature and atmospheric pressure, and the light source was simulated solar light, not natural sunlight. The gold loading was fixed at 1 wt%, and only TiO2 supports were used.
1：Experimental Design and Method Selection:
The study involved synthesizing TiO2 nanorods via hydrothermal methods under acidic and basic conditions, followed by depositing gold nanoparticles using a deposition-precipitation method. Catalysts were characterized and tested for CO-PROX reaction under dark and simulated solar light.
2：Sample Selection and Data Sources:
Titanium dioxide P25 (Degussa) was used as the precursor for TiO2 supports. Gold source was HAuCl4·3H2O (Sigma-Aldrich). Samples were calcined at different temperatures (500°C and 700°C).
3：List of Experimental Equipment and Materials:
Autoclave for hydrothermal synthesis, syringe pump for pH adjustment, calcination furnace, various characterization instruments (XRD, XPS, HRTEM, etc.), and a flow apparatus with fixed bed reactor for catalytic tests.
4：Experimental Procedures and Operational Workflow:
Hydrothermal synthesis of TiO2 nanorods, gold deposition, calcination, characterization using techniques like N2 physisorption, XRD, XPS, DRUV-vis, HRTEM, XRF, and catalytic activity tests under dark and light conditions.
5：Data Analysis Methods:
Data from characterization techniques were analyzed using specific software (e.g., Image J for TEM, PHI ACCESS ESCA-V6.0 F for XPS), and catalytic performance was evaluated based on CO conversion, selectivity, and turnover frequency calculations.
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X-ray diffractometer
X'Pert Pro
PANalytical
Used for X-ray powder diffraction (XRPD) to analyze crystal structure of catalysts.
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Small-angle X-ray scattering diffractometer
D8 DISCOVER
Bruker
Used for SAXS measurements to investigate nanostructures.
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Raman spectrometer
NRS-5100
JASCO
Used for Raman spectroscopy with 633 nm excitation.
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Raman microscope
Senterra
Bruker
Used for Raman spectroscopy with 785 and 532 nm excitation.
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UV-vis spectrophotometer
Lambda 35
Perkin
Used for DRUV-vis spectra to study optical properties.
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Titanium dioxide P25
P25
Degussa
Used as the precursor for synthesizing TiO2 nanorods supports.
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HAuCl4·3H2O
Sigma-Aldrich
Gold source for depositing gold nanoparticles on TiO2 supports.
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N2 physisorption apparatus
ASAP 2010
Micromeritics
Used for BET surface area and pore volume measurements.
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X-ray fluorescence spectrometer
ARL ADVANTXP
Used for elemental bulk composition analysis.
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Transmission electron microscope
TALOS F200x
Used for HRTEM and STEM to study size and morphology of nanoparticles.
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X-ray photoelectron spectrometer
PHI 5700
Physical Electronics
Used for XPS to analyze surface composition and chemical states.
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Solar simulator
Sunlight Solar Simulator
Abet Technologies
Used for simulated solar light irradiation during catalytic tests.
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Syringe pump
Used for slow addition of NaOH solution to adjust pH during gold deposition.
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Autoclave
Used for hydrothermal synthesis of TiO2 nanorods.
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