Gold Nanoparticle: Enhanced CO Oxidation at Low Temperatures by Using Fe-Doped TiO2 as Support

Hinojosa-Reyes, Mariana; Camposeco-Solís, Roberto; Zanella, Rodolfo; Rodríguez-González, Vicente; Ruíz, Facundo

doi:10.1007/s10562-017-2260-9

Cited by 19 publications

(8 citation statements)

References 44 publications

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“…The origin of such changes was related to the mutual influence of the support and the metal crystallites on each other through their interactions at the catalyst preparation step. Furthermore, it was found [38][39][40][41] that during the gold deposition, the support surface is protonated, which leads to formation of additional OH groups, which can remain on the surface even after drying and redox pretreatments. Moreover, a part of the acid sites previously present on the surface can be blocked by formed gold nanoparticles.…”

Section: Catalyst Characterization Resultsmentioning

confidence: 99%

Reductive Amination of Ketones with Benzylamine Over Gold Supported on Different Oxides

et al. 2019

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Reductive amination of cyclohexanone with benzylamine was investigated at 100 °C under 30 bar hydrogen in toluene with five different gold catalysts prepared by deposition-precipitation method and supported on TiO 2 , La 2 O 3 /TiO 2 , CeO 2 / TiO 2 , La 2 O 3 and CeO 2. Size of metallic gold varied in the range of 2.6-3.6 nm. The best catalysts in reductive amination of cyclohexanone with benzylamine were 4 wt% Au/TiO 2 and 4 wt% Au/CeO 2 /TiO 2 giving 72% and 79% yield of the desired amine. The most acidic and basic catalysts were also unselective and exhibited low activity towards imine hydrogenation. The best catalyst 4 wt% Au/CeO 2 /TiO 2 gave in reductive amination of propiophenone 56% selectivity to the corresponding amine at 20% conversion in 5 h.

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Section: Catalyst Characterization Resultsmentioning

confidence: 99%

Reductive Amination of Ketones with Benzylamine Over Gold Supported on Different Oxides

et al. 2019

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“…Gold was loaded onto the supports (unmodified TiO 2 or modified Me x O y /TiO 2 ), with nominal loadings of 0.5 and 4 wt. %, using HAuCl 4 ⋅ 3H 2 O as precursor, by deposition‐precipitation with urea, in the absence of light, following the procedure previously reported …”

Section: Methodsmentioning

confidence: 99%

Green Oxidation of n‐Octanol on Supported Nanogold Catalysts: Formation of Gold Active Sites under Combined Effect of Gold Content, Additive Nature and Redox Pretreatment

et al. 2019

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What prompted you to investigate this topic?The selective oxidation of alcohols to yield valuable chemical products is very important in fine organic synthesisa nd has great industrial importance.T he traditional oxidation processes use strong oxidants, which increaset he cost of the reaction and produce al arge amount of toxic waste. Thus, there is the need for more beneficiala nd sustainable technologies, using renewable feedstocks, like biomass, replacing fossil resources. Supported gold catalysts show remarkable activity for the oxidation of alcohols from biomass conversionp roducts in the liquid phase, with high activity,h igh selectivity and betterr esistancet od eactivation, compared to traditional platinum group metals.T he activity of gold catalysts is strongly dependent on many factors, and still requires further study. What inspired you for the cover image?The reaction of 1-octanol, representative of the class of less reactive aliphatic alcohols,f ound in large quantities in the products of biomass transformation,i sp resented. According to our research, the aerobic oxidation of this alcohol into valuable chemical, pharmaceutical and agrochemical products using gold supported catalysts occurs predominantly on cationic gold.

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“…192 This concept of forming TiO 2 with a semireduced surface has been used to rationalize the improved performance of Fe-doped TiO 2 as a support compared to a reference pure TiO 2 material. 193 The titania support was prepared using titanium-(IV) isopropoxide in a sol−gel synthesis approach with iron(III) nitrate introduced into the sol−gel to provide the desired level of doping. Au particles were added using the deposition precipitation route with urea as the reducing agent.…”

Section: Co Oxidation and Related Reactionsmentioning

confidence: 99%

Role of the Support in Gold-Containing Nanoparticles as Heterogeneous Catalysts

et al. 2020

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In this review, we discuss selected examples from recent literature on the role of the support on directing the nanostructures of Au-based monometallic and bimetallic nanoparticles. The role of support is then discussed in relation to the catalytic properties of Au-based monometallic and bimetallic nanoparticles using different gas phase and liquid phase reactions. The reactions discussed include CO oxidation, aerobic oxidation of monohydric and polyhydric alcohols, selective hydrogenation of alkynes, hydrogenation of nitroaromatics, CO2 hydrogenation, C–C coupling, and methane oxidation. Only studies where the role of support has been explicitly studied in detail have been selected for discussion. However, the role of support is also examined using examples of reactions involving unsupported metal nanoparticles (i.e., colloidal nanoparticles). It is clear that the support functionality can play a crucial role in tuning the catalytic activity that is observed and that advanced theory and characterization add greatly to our understanding of these fascinating catalysts.

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Gold Nanoparticle: Enhanced CO Oxidation at Low Temperatures by Using Fe-Doped TiO2 as Support

Cited by 19 publications

References 44 publications

Reductive Amination of Ketones with Benzylamine Over Gold Supported on Different Oxides

Reductive Amination of Ketones with Benzylamine Over Gold Supported on Different Oxides

Green Oxidation of n‐Octanol on Supported Nanogold Catalysts: Formation of Gold Active Sites under Combined Effect of Gold Content, Additive Nature and Redox Pretreatment

Role of the Support in Gold-Containing Nanoparticles as Heterogeneous Catalysts

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