Reactivity of the Alkaline Pretreated Nanoporous Gold for the CO Oxidation

Han, Dongqing; Zhou, Cunqi; Yin, Huiming; Zhang, Dongju; Xu, Xin

doi:10.1007/s10562-011-0619-x

Cited by 15 publications

(11 citation statements)

References 42 publications

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“…In summary, the HPCN acted as a support for the cleaning and recycling of the catalyst, and the pore channels of HPCN served as a container for loading the Au NCs. As shown in Table S1 in the Supporting Information, Au/HPCN showed better catalytic performance than other traditional Au/C catalysts . The Langmuir–Hinshelwood model was applied to explain the CO oxidation mechanism occurring on the gold surface, which is shown in Scheme .…”

Section: Resultsmentioning

confidence: 99%

Hollow Porous Carbon with in situ Generated Monodisperse Gold Nanoclusters for Efficient CO Oxidation

Zhu

Chen

et al. 2018

ChemCatChem

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Precious metals (Au and Pt) loaded in a mesoporous substrate (carbon and silicon) are popular materials for catalytic CO oxidation. However, the preparation of noble metals and the metal particle size after deposition in the pore channels of the mesoporous materials are serious issues for environmentally friendly applications. Herein, a gold‐decorated hollow porous carbon nanospheres (Au/HPCN) catalyst, which is both durable and uniform, is synthesized by a facile in situ reduction route for continuous CO oxidation. In our approach, HPCNs were selected as the substrate because of their thermal stability, well‐defined nanostructure, and large surface area. Au nanoclusters were loaded in the pore channels of HPCN because of their stability and catalytic performance. The as‐synthesized nanocomposite possesses a uniform size and highly porous structure. Moreover, CO oxidation occurred both during the reduction of Au3+ ions and after the preparation of Au/HPCN.

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Section: Resultsmentioning

confidence: 99%

Hollow Porous Carbon with in situ Generated Monodisperse Gold Nanoclusters for Efficient CO Oxidation

Zhu

Chen

et al. 2018

ChemCatChem

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“…Han et al 39 has found that CO conversion over NaOH (pH ¼ 12) treated nanoporous gold dropped sharply to 17% at 200 C, aer that the CO conversion increased rapidly to 100% at approximately 240 C. In other works of Au/HMS, 40 Au/MgO 41 catalyst, the CO conversion had a decreased in activity with the temperature increasing. Han et al 39 has found that CO conversion over NaOH (pH ¼ 12) treated nanoporous gold dropped sharply to 17% at 200 C, aer that the CO conversion increased rapidly to 100% at approximately 240 C. In other works of Au/HMS, 40 Au/MgO 41 catalyst, the CO conversion had a decreased in activity with the temperature increasing.…”

Section: Catalytic Activity For Co Oxidationmentioning

confidence: 95%

Hydrothermal synthesis of manganese oxide nanorods as a highly active support for gold nanoparticles in CO oxidation and their stability at low temperature

et al. 2015

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Nanostructured mesoporous a-MnO 2 nanorods were synthesized via a simple hydrothermal process using MnSO 4 $H 2 O and KMnO 4 as precursors. A series of Au/MnO 2 catalysts were prepared by a colloidal deposition (CD) method and were characterized by X-ray diffraction (XRD), nitrogen adsorption, scanning electron microscopy (SEM) and temperature programmed reduction of hydrogen (H 2 -TPR) analysis. The influence of the preparation conditions of the supports on the catalytic performance of Au/MnO 2 catalysts in CO oxidation has been investigated. The results show that the structure and properties of MnO 2 products were strongly dependent on the hydrothermal time. One can distinguish the aspect ratio of MnO 2 nanorods from SEM images. The obtained Au/MnO 2 catalysts with 1 wt% Au exhibits excellent performance with a complete CO conversion at 20 C (T 100% ¼ 20 C) and 50% CO conversion at À25 C (T 50% ¼ À25 C). Furthermore, H 2 -TPR studies reveal the superior activities have been attributed to the support unique reducibility and the interaction between Au and support. However, the U-shaped activity curves show a significant drop in CO conversion at low-temperature. With the help of temperature programmed desorption (CO 2 -TPD) and CO 2 static adsorption studies, it confirms that the deactivation of catalytic activity was attributed to the adsorbed CO 2 taking up the active sites, which can be desorbed by increasing the reaction temperature.

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“…With these studies, it has been revealed that apart from silver, oxygen species such as oxidized hydrocarbon, gold oxide, and subsurface oxygen left during the leaching process play a major role in catalytic activity. 23 Han et al 24 reported an alkaline-pretreated nanoporous gold for CO oxidation ( Figure 10). AuNPore was prepared by free corrosion of Au 42 Ag 58 alloy of 25 mm thickness using nitric acid at room temperature for 24 h. After washing these AuNPore samples with ultrapure water, they were treated with alkaline solution of NaOH or ammonia for 5 or 720 min.…”

Section: Co Oxidationmentioning

confidence: 99%