Hollow mesoporous ceria nanoreactors with enhanced activity and stability for catalytic application

Liu, Baocang; Yu, Shengli; Wang, Qin; Hu, Wenting; Peng, Jing; Liu, Yang; Jia, Wenjing; Liu, Yongxin; Liu, Lixia; Zhang, Jun

doi:10.1039/c3cc40665b

Cited by 122 publications

(83 citation statements)

References 25 publications

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“…The observed TOF's were comparatively better than those of other catalysts reported in literature [35][36][37][38]. Mn substituted cobalt ferrites as catalysts have the added advantage of their chemical stability, magnetic separability and facile synthetic procedure as compared to other expensive metal catalysts with tedious synthetic procedures.…”

Section: Kinetics Of Reductionmentioning

confidence: 75%

Mn substituted cobalt ferrites (CoMnxFe2−xO4 (x=0.0, 0.2, 0.4, 0.6, 0.8, 1.0)): As magnetically separable heterogeneous nanocatalyst for the reduction of nitrophenols

Singhal

Bansal²,

Kumar³

et al. 2015

Applied Surface Science

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Section: Kinetics Of Reductionmentioning

confidence: 75%

Mn substituted cobalt ferrites (CoMnxFe2−xO4 (x=0.0, 0.2, 0.4, 0.6, 0.8, 1.0)): As magnetically separable heterogeneous nanocatalyst for the reduction of nitrophenols

Singhal

Bansal²,

Kumar³

et al. 2015

Applied Surface Science

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“…56 the Pd-1 catalyst demonstrates obviously superior catalytic activity. It is clear that the Pd-1 catalyst prepared in this work is much more active than CNT/PiHP/Pd (300 h -1 of TOF).…”

Section: Resultsmentioning

confidence: 98%

PdO nanoparticles enhancing the catalytic activity of Pd/carbon nanotubes for 4-nitrophenol reduction

Wang

Yang

et al. 2015

RSC Adv.

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In this work, Pd/PdO nanoparticles supported on oxidized multi-walled carbon nanotubes (OCNTs) catalyst is first time prepared by a one-pot gas-liquid interfacial plasma (GLIP) method with the precursor Pd(NO 3 ) 2 ·2H 2 O. Our results demonstrate that the presence of PdO nanoparticles can significantly enhance the catalytic performance of Pd catalyst for the reduction of 4-nitrophenol (4-NP).In this work, we demonstrate that the presence of PdO nanoparticles can significantly enhance the catalytic performance of Pd catalyst for the reduction of 4-nitrophenol (4-NP). Heterogeneous Pd/PdO nanoparticles supported on oxidized multi-walled carbon nanotubes (OCNTs) catalyst is prepared by a one-pot gas-liquid interfacial plasma (GLIP) method with the precursor Pd(NO3)22H2O. The Pd/PdO catalysts with uniform size distribution exhibit remarkable catalytic activity during the reduction of 4-NP to 4-aminophenol (4-AP) in neat water at room temperature. The turnover frequency (TOF) value is up to 750 h -1 , which shows much higher catalytic activity than single Pd nanoparticles supported on OCNTs. Our results indicate that the Pd/PdO catalyst can be readily recovered and reused for 10 times.

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“…Our group has also focused on a Au-CeO 2 hybrid system. 98 We observed that a one-pot self-assembly synthesis could be induced by the addition of HAuCl 4 , Ce(NO 3 ) 3 , L-lysine, polyvinylpyrrolidone and butylmine in water at 80°C for 1 h. Figure 15 shows the corresponding TEM images of the as-obtained Au-CeO 2 hybrids with graphene-like nanostructures. Many drapes were observed in the final products, which could be attributed to the self-folding behavior of the 2D nanostructure.…”

Section: Ceo 2 -Encapsulated Au and Ag Nanostructuresmentioning

confidence: 97%

CeO2-encapsulated noble metal nanocatalysts: enhanced activity and stability for catalytic application

2015

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Encapsulation of small noble metal nanoparticles has received attention owing to the resulting highly increased stability and high catalytic activity and selectivity. Among the types of inert metal oxides, CeO 2 is unique. It is inexpensive and highly stable, and, more importantly, the unique electronic configuration gives it a strong capability to provide active oxygen. The method of fabricating CeO 2 -encapsulated noble metal nanocatalysts is determined by the requirements of the application. In this review, we first describe the various types of encapsulated noble metals and then the current developments of synthesis in detail, including the types of hybrid nanostructures and successful synthetic strategies. The following section, concerning catalytic applications, is divided into three topics: anti-sintering capabilities, catalytic activities and selectivities. We hope that this review of the recent achievements and the proposed strategy for addressing the emerging challenges will inspire further developments in this research area. NPG Asia Materials (2015) 7, e179; doi:10.1038/am.2015.27; published online 8 May 2015 INTRODUCTIONNoble metal catalysts have received much attention in the past decade because of their unique chemical and physical properties, and they have been widely applied in industrial use. [1][2][3][4][5][6][7][8][9][10] With the help of noble metal catalysts, environmental friendly catalysis resulting in the decreased production of pollutants, waste minimization and new synthetic routes that circumvent modern synthetic techniques such as Sonogashira-, Heck-and Miyaura-Suzuki-type reactions can be easily realized. 11-15 However, for most technologically important chemical processes, noble metal catalysts spontaneously aggregate and grow to reduce the surface energy, which limits the catalysts' lifetime and efficiency. The ultra-high prices of noble metals have also seriously limited their further development. Because of the development of modern industry, there remains a critical need for robust, simple and readily controllable routes to fabricate highly active, stable and recyclable nanocatalysts.To maximize the catalytic performance of noble metals and reduce the quantity used, it is necessary to load the active centers on a substrate. [16][17][18][19][20] A suitable substrate not only provides a high surface area to stabilize small nanoparticles (NPs) under long-term catalysis but also renders hybrid junctions with rich redox reactions on the two-phase interface. With the development of synthetic techniques in nanoscience, small noble metal NPs, especially atomically precise nanoclusters/metal oxide hybrid nanostructures, have been successfully fabricated very recently, and these materials exhibit remarkable enhanced catalytic activity and selectivity. [21][22][23] However, this simple loading form cannot meet the growing demand for the stability, because the noble metal catalysts contain numerous exposed surfaces

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Hollow mesoporous ceria nanoreactors with enhanced activity and stability for catalytic application

Abstract: Novel hollow mesoporous @M/CeO(2) (M = Au, Pd, and Au-Pd) nanospheres are created. The nanospheres can be used as effective nanoreactors with superior catalytic activity and stability for reduction of 4-nitrophenol due to their hollow mesoporous structural features.

Cited by 122 publications

References 25 publications

Mn substituted cobalt ferrites (CoMnxFe2−xO4 (x=0.0, 0.2, 0.4, 0.6, 0.8, 1.0)): As magnetically separable heterogeneous nanocatalyst for the reduction of nitrophenols

Mn substituted cobalt ferrites (CoMnxFe2−xO4 (x=0.0, 0.2, 0.4, 0.6, 0.8, 1.0)): As magnetically separable heterogeneous nanocatalyst for the reduction of nitrophenols

PdO nanoparticles enhancing the catalytic activity of Pd/carbon nanotubes for 4-nitrophenol reduction

CeO2-encapsulated noble metal nanocatalysts: enhanced activity and stability for catalytic application

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