Formation of nanometer-sized Au particles on USY zeolites under hydrogen atmosphere

Okumura, Kazu; Murakami, Chika; Oyama, Tetsuya; Sanada, Takashi; Isoda, Ayano; Katada, Naonobu

doi:10.1007/s13404-012-0051-z

Cited by 8 publications

(7 citation statements)

References 28 publications

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“…For mesoporous silica, the challenges in preparation are similar to those described for the regular silica supports which were discussed earlier. Mesoporous silica materials can also be deliberately decorated with functional groups, such as amine, − thiol, , and pyrrolidone, , to increase the interaction of the support with Au. Functionalizing the preformed Au particles/clusters before deposition on the mesoporous silica support is another approach which has been tried.…”

Section: The Role Of the Support During Catalyst Synthesismentioning

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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Section: The Role Of the Support During Catalyst Synthesismentioning

confidence: 99%

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

et al. 2020

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“…Figure 9a shows that the conversion of benzyl alcohol and the yield of benzaldehyde increased with an increase in the calcination temperature. The highest activity (conversion and yield) was obtained when the catalyst was treated at 673-973 K. Similarly, the dependence of the catalytic activity on the thermal treatment temperature was observed in the homocoupling of phenylboronic acid [19]. The change in the particle size of Au was correlated with the catalytic activity, which increased as the size of the Au particles decreased.…”

Section: Catalytic Performance In Aerobic Oxidation Of Benzyl Alcoholmentioning

confidence: 72%

Fabrication and Catalytic Activity of Thermally Stable Gold Nanoparticles on Ultrastable Y (USY) Zeolites

et al. 2013

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Au was deposited on ultrastable Y (USY) zeolites using an ion-exchange method. Up to 5.5 wt% Au was introduced into the NH 4 -form of USY zeolites. In contrast, deposition of Au hardly took place on the H-and Na-forms of Y-type zeolites, NH 4 -forms of mordenite, and ZSM-5. Treatment of the Au-loaded USY zeolite in a H 2 atmosphere, afforded Au 0 nanoparticles. These particles were thermally stable even at 973 K, where their mean particle diameter was 3.7 nm. In contrast, highly aggregated Au particles were observed after thermal treatment at temperatures lower than 523 K, followed by storage in air for a month. The resulting particle sizes were in good correlation with the IR band intensity of the adsorbed CO and the catalytic activity of Au in the aerobic oxidation of benzyl alcohol. The Au nanoparticles showed highest activity when the Au/USY zeolite was thermally treated at 673-973 K. A negligible deactivation was observed after repeating the reaction at least 12 times. In the case of Au/TiO 2 catalyst prepared by the deposition-precipitation method, the highest activity was observed at 573 K, which was lower than the temperature used for the Au/USY zeolites. This study demonstrated the potential use of the NH 4 -form of USY zeolites for supporting Au. OPEN ACCESSCatalysts 2013, 3 600

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“…Recently, Okumura et al . reported a preparation method for highly dispersed small metal supported NH 4 ‐USY zeolite catalysts ,. For this work, we adopted the method to prepare a 1 wt% Pt/NH 4 ‐USY catalyst with highly dispersed small Pt particles.…”

Section: Resultsmentioning

confidence: 99%

Low‐Temperature Direct Catalytic Hydrothermal Conversion of Biomass Cellulose to Light Hydrocarbons over Pt/Zeolite Catalysts

et al. 2017

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Direct catalytic hydrothermal conversion of cellulose to C 3 + C 4 hydrocarbons at a low temperature (443 K) over a Pt/zeolite catalyst without hydrogen or other expensive reagents was investigated. Pt supported on NH 4 + -form ultra-stable Y-type (NH 4 -USY) zeolite catalyst, which showed the highest activity among the tested Pt/zeolite catalysts, has appropriate acidity and a suitable active Pt site. The C 3 + C 4 hydrocarbon yield reached 14.5 C-% during the reaction over the Pt/NH 4 -USY catalyst at 443 K after 72 h of the reaction. Results showed that the acid strength of the zeolite support was an important factor affecting the cellulose decomposition activity. Because of their structural sensitivity, Pt/zeolite catalysts with Pt particles larger than 5 nm, including Pt/NH 4 -USY catalyst, showed higher TOF values than catalysts with Pt particles smaller than 5 nm.

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Formation of nanometer-sized Au particles on USY zeolites under hydrogen atmosphere

Cited by 8 publications

References 28 publications

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

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

Fabrication and Catalytic Activity of Thermally Stable Gold Nanoparticles on Ultrastable Y (USY) Zeolites

Low‐Temperature Direct Catalytic Hydrothermal Conversion of Biomass Cellulose to Light Hydrocarbons over Pt/Zeolite Catalysts

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