Bimetallic gold-silver catalysts based on ZnO and Zn/SBA-15 – The effect of various treatments on surface and catalytic properties

Kaskow, Iveta; Sobczak, Izabela; Yang, C. S.; Ziółek, Maria

doi:10.1016/j.cattod.2019.06.036

Cited by 8 publications

(4 citation statements)

References 43 publications

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“…%). It confirms the earlier results [11,19,20] showing that the interaction of gold (in the form of AuCl 4…”

Section: Composition and Structural/textural Propertiessupporting

confidence: 91%

“…It should be noted that some authors assigned the band at ~270 nm to Mn 3+ ions with tetrahedral coordination The values of specific surface area and pore volume significantly decrease for the samples modified with gold (surface area ~450-490 m 2 /g, pore volume 0.5-0.6 cm 3 /g). A similar behavior was also reported earlier for MCF [19] and SBA-15 mesoporous sieves [20], as a result of the functionalization of mesoporous solids with APTMS before modification with gold. The decrease in pore volume can be also a result of gold location in the pores of SBA-15, as shown in TEM images (Figure S2).…”

Section: Surface Characterizationsupporting

confidence: 88%

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Microwave-Assisted Base-Free Oxidation of Glucose with H2O2 on Gold- and Manganese-Containing SBA-15—Insight into Factors Affecting the Reaction Pathway

Sobczak

Kowalska

Nowicka

et al. 2022

IJMS

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The aim of this work was to gain insights into the role of manganese in MnSBA-15 support for gold in the base-free glucose oxidation with H2O2 using a microwave reactor. MnSBA-15 (manganese—acidity source) and SBA-15 (for comparison) were modified with Au (2.2 wt. %) and Cu (for comparison). The physicochemical properties of the catalysts were investigated by XRD, N2 ads/des, TEM, UV-vis, XPS, pyridine adsorption combined with FTIR, ATR-FTIR, and 2-propanol decomposition. The effects of the Mn presence in the support, Au NPs size that determines the number of active Au centers, and the Fermi energy (EF), together with the effects of the pore size, reaction temperature, and time on the activity and selectivity of the applied catalysts were assessed and discussed. It has been demonstrated that the presence of Mn generated Lewis acid centers which did not participate in glucose and H2O2 adsorption, and thus, were not directly involved in the reaction pathway. Both reagents were adsorbed on gold nanoparticles. H2O2 was decomposed to molecular oxygen which oxidized glucose to gluconic acid (50–90% of glucose conversion depending on the reaction time and ~100% selectivity). The presence of manganese in MnSBA-15 was responsible for increased Au NPs size and only slightly influenced the negative charge on gold particles. To achieve effective activity a compromise between the number of active gold species and the level of EF has to be reached (for 5.7 nm Au NPs).

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“…%). It confirms the earlier results [11,19,20] showing that the interaction of gold (in the form of AuCl 4…”

Section: Composition and Structural/textural Propertiessupporting

confidence: 91%

Section: Surface Characterizationsupporting

confidence: 88%

Microwave-Assisted Base-Free Oxidation of Glucose with H2O2 on Gold- and Manganese-Containing SBA-15—Insight into Factors Affecting the Reaction Pathway

Sobczak

Kowalska

Nowicka

et al. 2022

IJMS

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“…Therefore, it is oen constructed as a bimetallic catalyst for catalytic combustion of light hydrocarbons to solve this problem. 32,[66][67][68][92][93][94] This limits its application as a monometallic catalyst in catalytic combustion of light hydrocarbons.…”

Section: Noble Metal-based Catalystsmentioning

confidence: 99%

Recent advances and future challenges in the catalytic combustion of light hydrocarbon VOCs

He,

Dong,

Han

et al. 2024

J. Mater. Chem. A

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“…0.6 cm 3 /g). The decrease in the surface area and pore volume can be a result of the functionalization of mesoporous solids with APTMS before modification with metal [14,15] and/or copper location in the pores of SBA-15. As concerns the pore diameter, a higher decrease in this parameter was observed for Cu-SBA-15.…”

Section: Composition and Structure/texture Of Catalystsmentioning

confidence: 99%

Activation of Ethanol Transformation on Copper-Containing SBA-15 and MnSBA-15 Catalysts by the Presence of Oxygen in the Reaction Mixture

Sobczak

Wiśniewska

Decyk

et al. 2023

IJMS

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The aim of this study was to get insight into the pathway of the acetaldehyde formation from ethanol (the rate-limiting step in the production of 1,3-butadiene) on Cu-SBA-15 and Cu-MnSBA-15 mesoporous molecular sieves. Physicochemical properties of the catalysts were investigated by XRD, N2 ads/des, Uv-vis, XPS, EPR, pyridine adsorption combined with FTIR, 2-propanol decomposition and 2,5-hexanedione cyclization and dehydration test reactions. Ethanol dehydrogenation to acetaldehyde (without and with oxygen) was studied in a flow system using the FTIR technique. In particular, the effect of Lewis acid and basic (Lewis and BrØnsted) sites, and the oxygen presence in the gas reaction mixture with ethanol on the activity and selectivity of copper catalysts, was assessed and discussed. Two different reaction pathways have been proposed depending on the reaction temperature and the presence or absence of oxygen in the flow of the reagents (via ethoxy intermediate way at 593 K, in ethanol flow, or ethoxide intermediate way at 473 K in the presence of ethanol and oxygen in the reaction mixture).

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Bimetallic gold-silver catalysts based on ZnO and Zn/SBA-15 – The effect of various treatments on surface and catalytic properties

Cited by 8 publications

References 43 publications

Microwave-Assisted Base-Free Oxidation of Glucose with H2O2 on Gold- and Manganese-Containing SBA-15—Insight into Factors Affecting the Reaction Pathway

Microwave-Assisted Base-Free Oxidation of Glucose with H2O2 on Gold- and Manganese-Containing SBA-15—Insight into Factors Affecting the Reaction Pathway

Recent advances and future challenges in the catalytic combustion of light hydrocarbon VOCs

Activation of Ethanol Transformation on Copper-Containing SBA-15 and MnSBA-15 Catalysts by the Presence of Oxygen in the Reaction Mixture

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