Sinter-resistant metal nanoparticle catalysts achieved by immobilization within zeolite crystals via seed-directed growth

Zhang, Jian; Wang, Liang; Zhang, Bingsen; Zhao, Haixia; Kolb, Ute; Zhu, Yihan; Liu, Lingmei; Han, Yu; Wang, Guoxiong; Wang, Chengtao; Su, Dang Sheng; Gates, Bruce C.; Xiao, Feng‐Shou

doi:10.1038/s41929-018-0098-1

Cited by 344 publications

(273 citation statements)

References 49 publications

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“…1a,h represents tomogram-section structure of 2Ni0.5Pt@S-1 and 2Ni0.5Pt/S-1. This technology offers the sectioned view of the zeolite, thus avoiding the influence of metal nanoparticles on the external surface 55,[59][60][61]. The crystal cracks inFigure 1c,f indicted zeolites were successfully sectioned.…”

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confidence: 99%

Selective steam reforming of n‐dodecane over stable subnanometric NiPt clusters encapsulated in Silicalite‐1 zeolite

et al. 2020

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Multimetallic nanocatalysts have attracted increasing attention for steam reforming owing to highly exposed active sites, but often suffering from severe sintering. Herein, we design subnanometric Ni‐Pt bimetal clusters (ca. 1.7 nm) encapsulated in Silicalite‐1 zeolite (2Ni0.5Pt@S‐1) through ligand‐stabilized method to prevent sintering by fixing the metal into microporous channels. In the steam reforming of n‐dodecane test, 2Ni0.5Pt@S‐1 gave an excellent activity and stability with a decrease of conversion only 4% at 600°C for 4 hr, which was about a quarter that of 2Ni0.5Pt/S‐1 synthesized by co‐impregnation method, ascribing to superior sinter‐resistance of encapsulation structure. Moreover, 2Ni0.5Pt@S‐1 exhibited a higher H2 selectivity up to 69.9% than that of 2Ni0.5Pt/S‐1 (64.4%), owing to suppressed methanation reaction based on subnanometric clusters. Shape‐selective steam reforming of n‐dodecane and ofm‐xylene was also observed, because of m‐xylene could hardly diffuse into the zeolite channels due to its bulky molecular size, further preventing potential deactivation by tars in reforming process.

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confidence: 99%

Selective steam reforming of n‐dodecane over stable subnanometric NiPt clusters encapsulated in Silicalite‐1 zeolite

et al. 2020

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“…Figure b shows the XPS spectra of the Co 2.5 Al‐HT, Co 2.5 AlO y , Co 2.5 Al‐Ns, CoAl 2 O 4 , and Co 3 O 4 samples, revealing the surface composition of these systems . The Co 2.5 Al‐HT and CoAl 2 O 4 samples only contain Co 2+ species, while Co 2.5 Al‐Ns contain both Co 3+ and Co 2+ species with a Co 3+ /Co 2+ ratio of 1.9, which is comparable to that of the Co 3 O 4 sample (Co 3+ /Co 2+ = 2.0).…”

Section: Resultsmentioning

confidence: 88%

Mesoporous Co‐Al oxide nanosheets as highly efficient catalysts for CO oxidation

Zhang

Wang

et al. 2020

AIChE Journal

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We report mesoporous Co‐Al oxide nanosheets (CoxAl‐Ns, where x denotes the Co/Al ratio in the samples) prepared by calcination of CoAl‐hydrotalcite and subsequent alkaline treatment. X‐ray diffraction, scanning electron microscopy, transmission electron microscopy, and X‐ray photoelectron spectroscopy measurements show that the prepared Co‐Al oxide nanosheets (CoxAl‐Ns) are very thin (10–15 nm) and exhibit high mesoporosity (3–5 nm). Catalytic CO oxidation tests reveal that the CoxAl‐Ns exhibit excellent catalytic performances at relatively low temperatures: for example, the Co2.5Al‐Ns catalyst could achieve 99% CO conversion at −98°C. Kinetic studies and experimental investigations indicate that the high activity of the Co2.5Al‐Ns sample is strongly related to the abundance of active sites associated with the large Brunauer–Emmett–Teller surface area. The Co2.5Al‐Ns catalyst also achieves full conversion of CO in tests performed with a gas mixture simulating automobile exhaust gas at 200°C. After loading the Co2.5Al‐Ns on a porous ceramic substrate, the obtained Co2.5Al‐Ns/PC shows high activity and stability in CO oxidation process. These features are potentially important for future industrial applications of these catalysts.

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“…[50,62,63] Note that the nanoparticles within the supports,beitSilicalite-1 or mesoporous silica, would grow to larger particles,o wing to the movement, redistribution, and self-aggregation during the recrystallization under aqueous and vapor conditions.M ostly recently,a nother seed-directed method was developed for confinement of various noble nanometals (Pd, Pt, Rh, Ag) inside different zeolites (Silicalite-1, Beta, Beta-Fe, MOR) to prevent metal sintering. [64,65] Noble metal nanoparticles were first encapsulated in zeolite seeds and then placed into aluminosilicate or silicalite gels to form acrystalline zeolite sheath around the metal-containing seeds.The key for these syntheses was the use of amixture of zeolite seeds and noble metal nanoclusters,and the resultant catalysts exhibited extraordinary sinter resistance in hightemperature reactions.…”

Section: Re-transformationmentioning

confidence: 99%

“…In general, noble metal nanoparticles possess unique nanoscale effects and improved catalytic properties compared Pt/KLTL, [55] Pt/Silicalite-1, [59] Pt/Beta, [64] Pt/ZSM-5. [70] Oxidation of hydrocarbons (e.g.…”

Section: Size Effect For Activity Enhancing:from Nanoscale To Atomic mentioning

confidence: 99%

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Confinement Effects in Zeolite‐Confined Noble Metals

2019

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Confinement of noble nanometals in a zeolite matrix is a promising way to special types of catalysts that show significant advantages in size control, site adjustment, and nano‐architecture design. The beauty of zeolite‐confined noble metals lies in their unique confinement effects on a molecular scale, and thus enables spatially confined catalysis akin to enzyme catalysis. In this Minireview, the confined synthesis strategies of zeolite‐confined noble metals will be briefly discussed, showing the processes, advantages, features, and mechanisms. The confined catalysis carried on zeolite‐confined noble metals will be summarized, and great emphasis will be paid to the confinement effects involving size, encapsulation, recognition, and synergy. Great progress of atomic sites in the size effect, supercage stabilization in the encapsulation effect, site adsorption in the recognition effect, and cascade reaction in the synergy effect are highlighted. This Minireview is concluded with challenges and opportunities in terms of the synthesis of zeolite‐confined noble metals and their applications to design multifunctional catalysts with high catalytic activity, selectivity, and stability.

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Sinter-resistant metal nanoparticle catalysts achieved by immobilization within zeolite crystals via seed-directed growth

Cited by 344 publications

References 49 publications

Selective steam reforming of n‐dodecane over stable subnanometric NiPt clusters encapsulated in Silicalite‐1 zeolite

Selective steam reforming of n‐dodecane over stable subnanometric NiPt clusters encapsulated in Silicalite‐1 zeolite

Mesoporous Co‐Al oxide nanosheets as highly efficient catalysts for CO oxidation

Confinement Effects in Zeolite‐Confined Noble Metals

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