TiO2 Support Research Articles

V2O5-WO3 catalysts treated with titanium isopropoxide using a one-step co-precipitation method for selective catalytic reduction with NH3

Selective Catalytic Reduction (SCR) of nitrogen oxides (NOx) is the most effective way to reduce NOx emissions. However, the most used catalysts for this purpose, V2O5-WO3/TiO2 (VWTi) hybrid system, have limited applicability owing to its narrow operating temperature range (300–400 °C). Therefore, catalysts with abundant active sites are needed to extend the temperature range to more acceptable values (200–400 °C). The number of active sites depends on the catalyst synthesis method. The aim of this study is to increase the dispersion of V-OH and W-OH through a one-step process, this is achieved by treating the TiO2 support with titanium isopropoxide (TTIP) and simultaneously incorporating the V-OH and W-OH. This synthesis method used here is expected to enhance the interaction between the support and V-OH and W-OH by increasing the number of catalytically active sites. This process is simple and could be applied for the catalyst manufacturing process in the industrial scale. The optimal performance observed for the catalysts prepared at a TTIP loading of 5 wt% using a one-step method is due to its higher catalytic activity at lower temperatures, the observed results could be explained based on the formation of abundant V-OH and W-OH functional groups and the V4+/V5+ ratio (≈1). The scope of this study is to develop a new catalyst for selective catalytic reduction of nitrogen oxides.

Ceria accelerates ammonium bisulfate decomposition for improved SO2 resistance on a V2O5-WO3/TiO2 catalyst in low-temperature NH3-SCR

BackgroundAmmonia bisulfate (ABS) deposition on the active sites of the catalyst surface is the main reason for SO2 poisoning in low-temperature NH3-selective catalytic reduction (SCR). Accelerated ABS decomposition efficiently enhances the SO2 resistance. MethodsIn this work, ceria was specifically chosen to decorate V2O5-WO3/TiO2 catalyst (Ce-VW/Ti) to activate ABS decomposition in low-temperature NH3-SCR. Significant findingsThe optimal 7Ce-VW/Ti catalyst accelerated the decomposition of ABS and had superior SO2 tolerance at 250°C. The additive CeO2 improved the specific surface area and surface acidity, favoring the NH3-SCR catalytic activity. ABS was preferentially deposited on the additive CeO2 on the surface of the 7Ce-VW/Ti catalyst and generated cerium sulfate, eventually protecting the active V2O5 sites and TiO2 support. Moreover, high quantity of V5+ and charge transfer between active species V2O5 and support TiO2 could be maintained due to CeO2 protection, subsequently maintaining the high NH3-SCR performance and enhancing the SO2 tolerance.

Direct activation of PMS by highly dispersed amorphous CoOx clusters in anatase TiO2 nanosheets for efficient oxidation of biomass-derived alcohols

Developing a green and cost-effective catalytic system for the selective oxidation of biomass-derived alcohols is vital for the sustainable synthesis of fine chemicals. Herein, highly dispersed subnanometric amorphous CoOx clusters in anatase TiO2 nanosheets (Co-TiO2) fabricated by green solvent CO2-assisted approach could directly activate peroxymonosulfate (PMS) for the highly selective oxidation of various biomass-derived alcohols. Advanced characterizations (e.g., EXAFS, EPR, AC HAADF-STEM) reveal that a strong interaction of CoOx clusters and the anatase TiO2 support exist in Co-TiO2 and Co atom in Co-TiO2 is mainly consisted of Co2+ and Co3+. The Co-TiO2 catalyst offers superior catalytic performance in the conversion of six types of alcohols (e.g., benzyl alcohol (BAL), 5-hydroxymethylfurfural (HMF)) with high selectivity to produce corresponding aldehydes. Highly dispersed CoOx clusters and the interaction between CoOx clusters and TiO2 support contribute to the superior performance. Mechanism studies show that SO4•− radicals play the dominant role in the selective oxidation of model reactant BAL and 1O2 participates in the non-radical pathway. DFT calculations are well matched with experiment and decipher that the strong interaction between CoOx clusters and TiO2 support promotes the formation of SO4•– and SO5•–.

Perpetual hyperpolarization of allyl acetate from parahydrogen and continuous flow heterogeneous hydrogenation with recycling of unreacted propargyl acetate

A novel closed loop, continuous flow (CF) reactor system for parahydrogen enhanced nuclear magnetic resonance (NMR) of liquids via heterogeneous catalysis is introduced which enables recycling of unreacted liquid substrate reactant. This system consists of an HPLC pump, a liquid substrate reservoir incorporating a gas diffuser, an all-metal packed bed catalytic reactor, and an AF-2400 tube-in-tube gas permeable membrane for removal of normal H2. Two types of supported metal nanoparticle catalysts were tested: mesoporous silica encapsulated Pt3Sn intermetallic nanoparticles and a Rh on anatase TiO2 support. In the CF hydrogenation of propargyl acetate to allyl acetate, the hyperpolarized signals exhibited stability over 20 min of recirculation, with signal enhancements of up to 626 using 99% p-H2 and negligible leaching of the catalyst into the flowing solutions. These results demonstrate the practicality of performing systematic optimization of conditions for continuous flow catalysis and polarization transfer to heteronuclei with important implications for biomedical magnetic resonance imaging.

Partial Oxidation of Methane over CaO Decorated TiO2 Nanocatalyst for Syngas Production in a Fixed Bed Reactor

Syngas is a valuable entity for downstream liquid fuel production and chemical industries. The efficient production of syngas via catalytic partial oxidation of methane (CPOM) is an important process. In this study, partial oxidation of methane (POM) was carried out using CaO decorated TiO2 catalysts. The catalysts were synthesized employing the sol-gel method, while the decoration of TiO2 with CaO was achieved in an aqueous solution by wetness impregnation method. The prepared catalysts were characterized by employing XRD, Raman, TG-DTG, and SEM-EDX for structural and morphological analysis. On testing for POM, at 750 °C the catalysts demonstrate excellent CH4 conversion of 83.6 and 79.5% for 2% and 3% CaO loaded TiO2, respectively. While the average H2/CO ratio for both 2% and 3% CaO loaded TiO2, 2.25 and 2.28, respectively, remained slightly above the theoretical value (H2/CO = 2.0) of POM. The improved POM performance is attributed to the optimally loaded CaO on the TiO2 surface that promotes the reaction where TiO2 support ensure less agglomerated particles, resulting into a fine distribution of the active catalytic sites.

Tuning charge transfer of Pt cluster by support defects in Pt/TiO2 for photocatalytic conversion of fatty acid into diesel-like alkane

Efficient deoxygenation for the bio-derived fatty acid is paramount to producing diesel-like alkane and usually requires harsh reaction conditions. Here, we reported an efficient conversion system for the photocatalytic conversion of fatty acid over Pt/TiO2 catalysts and acid conversion higher than 99.0% (yield nearly 84.5%) under the mild conditions 30 °C, 0.1 MPa H2, and 365 nm light. X-ray photoelectron spectroscopy (XPS) and Density Functional Theory (DFT) calculations suggest that the oxygen vacancies TiO2 can achieve the charge transfer from TiO2 support to Pt clusters. The electron-rich Pt cluster can promote hydrogen spillover to form a hydrogen-rich surface. Thus, it leads to the photo-decarboxylation Cn-1 alkyl radical being amenable to proton hydrogenation to produce Cn-1 alkane. Detailed characterization demonstrates that 0.50 wt% Pt/TiO2 has superior photocatalytic performance. Introducing the Pt atoms can promote the formation the oxygen vacancies and reverse charge transfer, which determines the acid adsorption and conversion mechanism.

Interaction between noble metals (Pt, Pd, Rh, Ir, Ag) and defect-enriched TiO2 and its application in toluene and propene catalytic oxidation

The particle size, electronic state, as well as metal-support interaction of supported noble metal catalysts significantly influence their VOC oxidation performance. A series of noble metals (including Pt, Pd, Rh, Ir, and Ag) was successfully loaded on TiO2 modified by hydrogen reduction to scrutinize their effects on toluene and propene combustion. The prepared catalysts were characterized by SEM, TEM, BET, XRD, ESR, UV–vis, H2-TPR, XPS, in-situ DRIFTS, GC–MS and DFT calculations. It was interesting to note that all the noble metals could be well-dispersed on the low-surface-area TiO2 support and modulated its properties. The electron transfer ability and oxygen mobility of the as-prepared materials were enhanced via noble metal doping. Among them, the Pd/TiO2 and Pt/TiO2 catalysts exhibited excellent catalytic performance by inducing local electron transfer from TiO2 to the noble metal NPs via the strong metal-support interaction. Experimental results and theoretical calculations revealed that the activation of toluene, propene and oxygen on suitable interfaces contributed to the good performance of the Pd and Pt catalysts. This work explored and elucidated the effects of electron-rich noble metal catalysts in enhancing the activation of ground-state oxygen.

Coal-based carbon quantum dots-sensitized TiO2 NRs/PTTh heterostructure for self-powered UV detection

In recent years, TiO2-based UV photodetectors (UVPDs) have gained widespread attention owing to their abundant raw materials and low synthesis cost. However, the low responsivity, slow response speed and high-power consumption limit the application of these UVPDs. In this study, p-n heterojunction self-powered UVPDs consisting of n-type coal-based carbon quantum dot-sensitized TiO2 nanorod arrays (TiO2 NRs:C-CQDs) and p-type poly(2, 2′:5′, 2′'-trithiophene) (PTTh) are reported. The structure, morphology and photoresponse properties of the TiO2 NRs:C-CQDs/PTTh heterojunctions are methodically investigated. These results indicate that the sensitization of C-CQDs has a significant impact on the electrical and optical properties of p-n heterojunction UVPDs. The performance study results of UVPDs at different optical power densities show that the device is able to accurately detect UV light of specific wavelengths, and the device achieved a maximum responsivity (R) (1.45 mA/cm2) and a high detectivity (D*) (4.94 × 1010 Jones) when the light intensity is 0.35 mW/cm2, while the rise and fall times shortened to 91.2 ms and 3.19 ms, respectively.These indicate that TiO2 NRs:C-CQDs/PTTh achieves the high performance self-powered UV light detection. This work offers theoretical support and technical route for TiO2 based self-powered UVPDs.

Particle-Size-Dependent Electronic Metal–Support Interaction in Pd/TiO2 Catalysts for Selective Hydrogenation of 3-Nitrostyrene

The Pd/TiO2 catalysts with varying Pd nanoparticle sizes are used to study the control of selectivity toward the hydrogenation of 3-nitrostyrene (3-NS). Our results show the selectivities of 3-vinylanilline (3-VA) rise by decreasing the particle size, while the selectivity of 3-ethylnitrobenzene (3-EN) is the opposite. However, over the Pd/SiO2 catalysts, 3-EN moieties are the dominant product regardless of their differences in particle size. We find that the electronic interactions between Pd NPs and the TiO2 support rise by decreasing particle size, as a result, creating more admetals on the Pd NPs in contact with TiO2, which favorably adsorb the nitro group of 3-NS, thus resulting in enhanced selectivity of 3-VA. However, the classical strong metal–support interactions (SMSI) induced by reduction at elevated temperatures play no significant role in the controlling of selectivities of 3-VA and 3-EN. The SiO2-supported Pd NPs without electronic metal–support interactions (EMSIs) prefer the reduction of the vinyl group of 3-NS. This work underlines the importance of EMSI governing the selectivity for hydrogenation of unsaturated nitroarene reactions.

Platinum catalysts supported on mixed-phase TiO2 coated by nitrogen-doped carbon derived from NH2-MIL-125 for methanol oxidation

Supports play a key role in the performance of platinum-based catalysts. In this work, using NH2-MIL-125 as the precursor, mixed-phase TiO2 coated by nitrogen-doped carbon (TiO2 @NC) is successfully prepared, and used to support platinum (Pt/TiO2 @NC) for methanol oxidation reaction. In 0.5 M H2SO4 solution containing 0.5 M CH3OH, the area specific activity of Pt/TiO2 @NC catalyst (1.186 mA cm-2 Pt) is 4.4 times that of commercial Pt/C (0.272 mA cm-2Pt). At a fixed potential of 0.15 V (vs. Hg/Hg2SO4), the current density of Pt/TiO2 @NC is still 3.6 times that of Pt/C after 3600 s of polarization. Meanwhile, Pt/TiO2 @NC has also a low tafel slope, a large exchange current density and a high charge transfer coefficient. A large number of Ti-OH groups can alleviate poisoning effect caused by the produced "COads" intermediate during methanol oxidation reaction. Nitrogen-doped carbon not only improves the conductivity of TiO2 support, but provides strong anchor sites for the nucleation of Pt nanoparticles, resulting in an enhanced catalytic activity of Pt/TiO2 @NC.

Facile synthesis of Co-Rh bimetallic catalysts for methane decomposition: Effect of support morphology

In this study, the performance of 10 wt.% Co -1 wt. % Rh/TiO2 catalysts with varying textural properties have been investigated to produce the hydrogen and carbon nanotubes via the methane decomposition process. An improved evaporation-induced self-assembly approach synthesized the mesoporous TiO2 supports, and Co-Rh nanoparticles over the as-synthesized TiO2 supports were created by the co-impregnation method. XRD, BET, TGA, SEM, and TEM studies characterized the fresh and used catalysts. The findings revealed that the texture of TiO2 support has an important influence on catalytic performance. With the increase in calcination temperature, the specific surface area of the catalysts decreases while the anatase content of TiO2 species increases. The catalyst prepared with TiO2 calcined at 600 °C displayed superior catalytic activity and stability due to the better metal dispersion and higher anatase phase content in support. The initial activity depended on the specific surface area, whereas the stability or the hydrogen productivity for the equal deactivation level was related to the anatase composition of the catalyst. The nature of deposited carbon varies due to the phase composition of TiO2. The SEM and TEM images revealed that anatase TiO2 generated smaller multi-walled carbon nanotubes (MWCNTs) with a more consistent diameter distribution than the other catalysts. Catalysts with an amorphous composition increase the formation of CHx carbon species. The apparent activation energies for various Co-Rh catalysts varied between 65 and 85 kJ mol−1. The Co-Rh bimetallic combination had more significant activity than the Ni metal.

Iron removal and titanium dioxide support recovery from spent V2O5-WO3/TiO2 catalyst

Iron seriously affects the quality of TiO2 support recovered from spent selective catalytic reduction (SCR) catalyst. In this paper, the iron removal and TiO2 support recovery from spent SCR catalyst were studied. The experiment results suggested that iron exists on the surface and bulk structure of a spent SCR catalyst. The iron deposited on the surface of the spent SCR catalyst was removed by ultrasonic cleaning. The iron remaining in the bulk structure of the spent SCR catalyst was primarily Fe(III) and was adequately removed by NaOH activation and acid washing. The NaOH activation process considerably increased the specific surface area of the spent SCR catalyst. Subsequently, iron was efficiently dissolved through the synergistic effect of sulfuric acid and ascorbic acid. Sulfuric acid dissolved iron in the form of Fe3+, and ascorbic acid promoted iron dissolution by reducing Fe3+ to Fe2+. After the recovery process, 97.1% of the iron in the spent SCR catalyst was removed, and anatase TiO2 was recovered from the spent SCR catalyst. The recovered anatase TiO2 can be used as support material to produce fresh SCR catalyst.

TiO2 supported Pd nanoclusters with surface defects toward highly efficient hydrogenation of quinone to hydroquinone under mild conditions

Hydrogenation of quinones is an efficient way to produce hydroquinone compounds. Typically, 2,3,5-trimethylhydroquinone (TMHQ), the key intermediate of vitamin E, can be produced via hydrogenation of 2,3,5-trimethylbenzoquinone (TMBQ). In order to effectively obtain the target products, the exploration of efficient heterogeneous catalysts is highly desired. In this study, supported Pd nanocluster catalysts (PdN/TiVo) were designed through a deposition-precipitation method over TiO2 support with surface defects (TiVo) to achieve high atomic utilization efficiency of the noble metal Pd under mild reaction conditions. The characterization showed that oxygen vacancies generated by H2 reduction on the support TiO2 acted as specific sites to promote the formation of the coupled eutectic growth structure composed of the active metal Pd and TiVo. The active metal Pd which not only exhibited high dispersion but also formed electron-rich active sites can activate H2 while the Ti3+ atoms at oxygen vacancy sites can adsorb the oxygen species from TMBQ, thereby a synergistic catalytic effect can be shown to enhance the adsorption and hydrogenation of C=O bonds. Thus PdN/TiVo revealed a high yield of TMHQ of 96% and TOF of 276 min−1 under a considerably wild condition (45°C, 0.2 MPa, 60 min). By comparison, state-of-the-art carbon based Pd catalysts (PdN/C) acquired only 29% yield and 41 min−1 TOF in the same way. The simultaneous engineering of Pd catalyst and oxygen vacancies on TiO2 offers a new strategy to develop efficient heterogeneous catalysts for hydrogenation of quinones.

Photocatalytic transformation of Rhodamine B to Rhodamine-110 – The mechanism revisited

Understanding of the TiO2-assisted phototransformations observed for fundamentally important derivatives of Rhodamine B is expected to bring consistent and eventually comprehensive knowledge on behavior of this dye. The photocatalytic transformations of Rhodamine B in solution irradiated with visible light embrace an N-deethylation process eventually forming Rhodamine-110 rather than degradation of the chromophore. The N-deethylation of Rhodamine B was studied in solution and for the first time in the solid state. In this work, the influence of the wavelength of incident light on the photocatalytic processes involving Rhodamine dyes, is presented. The results indicate that the selection of wavelength is crucial to govern the pathway of RhB degradation. The N-deethylation process does not require reactive oxygen species, as assumed in literature, but the photoinduced electron transfer between the adsorbed RhB molecule and the TiO2 support, followed by radical transformations of the dye, plays a key role.

Preparation of a transition metal-supported TiO2 catalyst and the catalytic oxidative degradation of toluene

The synthesis of supported transition metal oxides with satisfactory low-temperature catalytic performance and application potential is still a challenge for the complete degradation of VOCs. Ni-Cu-loaded TiO2 catalysts were prepared by an impregnation method. The lattice defect and oxygen vacancy concentrations of the prepared materials could be tuned by controlling the Ni/Cu molar ratio and the mass proportion of the TiO2 support. 5Ni-Cu/TiO2 exhibited the best catalytic activity and showed superior catalytic stability during complete toluene oxidation. The obtained catalysts were fully characterized by XRD, FT-IR, TEM, N2 adsorption analysis, XPS, H2-TPR, O2-TPD, TPD analysis, and XPS. The 5Ni-Cu/TiO2 catalyst had improved pore sizes and specific surface area, had more oxygen vacancies on its surface, had increased concentrations of adsorbed and lattice oxygen species, and had good redox properties; these characteristics were favorable for low-temperature catalytic performance and catalytic stability. Cyclic transformations of metal valence states between Cu+ and Cu and between Ni and Ni2+ were observed in the catalytic system. A potential catalytic reaction process based on the M-vK mechanism was proposed. This work serves as a reference for the application of supported transition metal catalysts for the degradation of VOCs.

Role of Temperature, Pressure, and Surface Oxygen Migration in the Initial Atomic Layer Deposition of HfO2on Anatase TiO2(101)

The atomic layer deposition of HfO2 on a TiO2(101) surface from tetrakis(dimethylamido)hafnium and water is investigated using a combination of in situ vacuum X-ray photoelectron spectroscopy (XPS) and time-resolved ambient pressure XPS. Precursor pressures and surface temperature are tuned as to map the space state of the deposition. In the initial stages of ALD, a reaction mechanism based on dissociative adsorption dominates over a classic ligand exchange mechanism, typically evoked when metal-amido complexes and water are used as the precursors for metal oxide ALD. Surface species, including a dimethyl ammonium ion and an imine, are identified. It is found that they can be formed only if the active role of the TiO2(101) surface is taken into consideration. The temperature of the surface enhances the formation of these species based on an insertion reaction of a hydrogen atom, which then assists the formation of more than the expected monolayer of HfO2. A HfO2 overlayer is produced already during the first half-cycle, enabled by a reduction of the TiO2 support. Dosing water at high pressure allows hydroxyl formation, which marks the transition toward a well-described ligand exchange reaction type. From the experiments performed, we find that the ALD of HfO2 at room temperature, performed at high pressure, is mainly based on dissociation and that no side reaction occurs. These insights into the ALD reaction mechanism highlight how in situ studies can help understand how deposition parameters affect the growth of HfO2 and how the ALD model for transition metal oxide formation from amido complexes and water can be extended.

Interfacial engineering boosting charge extraction for efficient photocatalytic hydrogen evolution

In heterostructure photocatalyst, metal–support interaction plays a key role in determining the photocatalytic reaction, which is rarely studied due to its complicated mechanism involving interfacial bonding, internal electric field, and charge transfer etc. Here we report an interfacial engineering to promote the photocatalytic hydrogen evolution of the model photocatalyst Pt/TiO2. A stable oxidized Cu+ layer was inserted as an interlayer between Pt nanoparticles and TiO2 support, which boosts the efficiency of photoinduced charge extraction and regulates the surface charge state of the photocatalyst. The synthesized photocatalyst Pt/Cu/TiO2 exhibits highly efficient hydrogen evolution of 1 L g−1h−1, which is 63% higher than the photocatalyst Pt/TiO2. This charge extraction strategy is also evidenced on photocatalysts Pt/(Rh, Co or Ni)/TiO2. Our findings not only provide insight into interfacial interaction in photocatalyst, but also offer effective guidelines for the design and fabrication of high-performance photocatalysts.

(Invited) Three-Dimensional Investigation of the Anodic Catalyst Layer in Polymer Electrolyte Water Electrolysis

Reducing precious metal loading in the anodic catalyst layer (CL) is indispensable for lowering capital costs and enabling the widespread adoption of polymer electrolyte water electrolysis (PEWE). This work presents the first three-dimensional reconstruction of a state-of-the-art TiO2-supported IrO2 based core shell catalyst layer (3 mgIrO2/cm2), using high-resolution X-ray ptychographic tomography at a cryogenic temperature of 90 K. The ptychographic tomography was performed at the cSAXS beamline of the Swiss Light Source (PSI). The high data quality and phase sensitivity of the technique have allowed the reconstruction of all four phases namely pore space, IrO2, TiO2 support matrix and the ionomer network, the latter of which has proven to be a challenge in the past. Results show that the IrO2 forms thin nanoporous shells around the TiO2 particles and that the ionomer has a non-uniform thickness and partially covers the catalyst. The TiO2 particles do not form a percolating network while all other phases have high connectivity. The analysis of the CL ionic and electronic conductivity shows that for a dry CL, the ionic conductivity is orders of magnitudes lower than the electronic conductivity. Varying the electronic conductivity of the support phase by simulations reveals that the conductivity of the support does not have a considerable impact on the overall CL electrical conductivity. Figure 1

Singly dispersed Ir1Ti3 bimetallic site for partial oxidation of methane at high temperature

The interaction between metal and support is an essential topic in heterogeneous catalysis. The role of strong metal-support interaction (SMSI) between support and metal particles, oxide, or single atom site in catalysis has been investigated recently. In this work, we report a singly dispersed bimetallic site (SDBM), Ir1Ti3, formed on TiO2 support during partial oxidation of methane. The Ir1Ti3 site exhibits an unusual “switch on/off” catalytic activity for partial oxidation of methane to produce syngas, which is due to the strong interaction between TiO2 support and in-situ formed Ir1Ti3 SDBM site. The high activity and stability of the catalyst are also due to the unique structure according to the strong interaction effect. This work reveals the SMSI between oxide and SDBM and further impacts on catalysis.

Catalytic behavior of gold nanoparticles supported on a TiO2-Al2O3 mixed oxide for CO oxidation at low temperature.

The present work highlights the versatility of a TiO2-Al2O3 mixed oxide bearing highly dispersed gold nanoparticles that was applied in the CO oxidation reaction at room temperature. The TiO2, Al2O3, and TiO2-Al2O3 supports were synthesized by the sol-gel method, while gold nanoparticles were added by the deposition-precipitation with urea method using a theoretical Au loading of 2 wt.%. A promotional effect of the TiO2-Al2O3 support on the activity of gold catalysts with respect to TiO2 and Al2O3 was observed; Au/TiO2-Al2O3 showed outstanding CO oxidation, being active from 0°C and stable throughout a 24-h test. As for the alumina content (5, 10, and 15 wt.%) in TiO2, it improved the textural properties by retarding the crystal growth and anatase-rutile phase transformation of TiO2, suppressing the deposition of carbon on the catalyst surface and stabilizing the Au nanoparticles even at high temperatures. Gold was highly dispersed with nanoparticle sizes ranging from 1 to 2nm when H2 was used to treat thermally the Au/TiO2-Al2O3, Au/TiO2, and Au/Al2O3 materials. In addition, the XPS technique helped elicit that Au0 and Au1+ boosted their interaction with the TiO2, Al2O3, and TiO2-Al2O3 supports by means of charge transfer, which resulted in outstanding CO oxidation activity from 0°C. Likewise, the key factors that control the peculiar catalytic performance in the CO oxidation reaction are discussed, which represents a step forward in the versatility behavior of gold catalysts supported on mixed oxide catalysts.