Untersuchungen zur Herstellung von ZSM‐5‐Schalen‐ und Vollkatalysatoren

Danner, Alfred; Unger, Klaus K.

doi:10.1002/cite.330620612

Cited by 10 publications

(2 citation statements)

References 5 publications

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“…The introduction of mesopores or macropores into zeolites has recently been achieved using new strategies that go beyond the traditional methods of steaming, leaching, or chemical treatment. Much attention has been focused on the endo- and exotemplating route with various templates, such as porous carbon, silica, or wood cells, to prepare zeolites with desired pore structure. − As illustrative examples, Jacobsen et al have used carbon blacks or carbon nanotubes as templates to synthesize zeolites with an additional mesopore system. Mesoporous ZSM-5 zeolite has also been synthesized using colloid-imprinted carbon as template in Pinnavaia's group .…”

Section: Introductionmentioning

confidence: 99%

Hierarchically Structured Monolithic Silicalite-1 Consisting of Crystallized Nanoparticles and Its Performance in the Beckmann Rearrangement of Cyclohexanone Oxime

et al. 2005

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In this study, we present a synthetic pathway for the fabrication of self-supporting zeolite monoliths consisting of crystallized nanoparticles. A resorcinol-formaldehyde-based organic aerogel is used as a template, and silicalite-1 is used as the zeolite example. The silicalite-1 monoliths obtained consist of individual well-defined zeolite nanocrystals with sizes of 30-40 nm. The monoliths exhibit a high mechanical stability and have hierarchical porosity, with micropores within the zeolite particles, a mesopore system formed by the packing of the nanoparticles, and a macropore system on the monolith level. Such monolithic zeolites show high selectivity typically above 80% to epsilon-caprolactam combined with a high rate of reaction of 0.46 g(caprolactame)/(g(catalyst).h) in the Beckmann rearrangement of cyclohexanone oxime.

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Section: Introductionmentioning

confidence: 99%

Hierarchically Structured Monolithic Silicalite-1 Consisting of Crystallized Nanoparticles and Its Performance in the Beckmann Rearrangement of Cyclohexanone Oxime

et al. 2005

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“…However, it is well known that crystalline zeolite materials are difficult to washcoat, and that the use of binder may increase the diffusion problem and reduce the accessible porosity. Then, it has been proposed to prepare the zeolite component from crystallites grown on support surfaces, socalled in situ synthesis [5]. The main advantage of in situ synthesis over other coating techniques is that the support is used as a base for nucleation and that a chemical bonding between crystals and outer support layer is formed [6].…”

Section: Introductionmentioning

confidence: 99%

Direct synthesis of zeolite coatings on cordierite supports by in situ hydrothermal method

Xue

Chen

et al. 2005

Applied Catalysis A: General

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Selective Catalytic Reduction of NO by Ammonia over Raney-Ni Supported Cu-ZSM-5 I. Catalyst Activity and Stability

Ma¹,

Grünert²

2000

Chem. Eng. Technol.

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Composite materials containing Raney Ni and Cu-ZSM-5 are highly active catalysts for the selective catalytic reduction (SCR) of NO by NH 3 . Their catalytic properties were studied with particular attention to the influence of moisture and SO 2 in the feed, and to effects of catalyst shaping operations. Composite materials (16±20 wt-% zeolite) were prepared by mixing the components, with different degree of segregation in the resulting pressed particles, or by growing ZSM-5 crystallites on the surface of leached Raney Ni, which were then exchanged with Cu ions. Catalytic tests were performed with 1000 ppm NO, 1000 ppm NH 3 , 2 % O 2 in He, at 3±6.5 . 10 5 h ±1 (related to zeolite component). With physical mixtures, the catalytic behaviour strongly depended on the mixing strategy, particles containing both Ni and zeolite being inferior to mixed Ni-only and zeoliteonly particles. The SCR activity was promoted by 2 % H 2 O in the feed, SO 2 (200 ppm) was a moderate poison at low temperatures, but indifferent or slightly promoting at high temperatures. A catalyst prepared from ZSM-5 grown on Raney Ni, which was ranked intermediate in dry feed, was promoted to excellent performance in H 2 O and SO 2 containing feed at T > 700 K and was stable for 38 h at 845 K. The results suggest that SCR catalysts containing highly active zeolites should be produced avoiding shaping operations e.g. by use of zeolite crystallites grown on wire packings.

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Untersuchungen zur Herstellung von ZSM‐5‐Schalen‐ und Vollkatalysatoren

Cited by 10 publications

References 5 publications

Hierarchically Structured Monolithic Silicalite-1 Consisting of Crystallized Nanoparticles and Its Performance in the Beckmann Rearrangement of Cyclohexanone Oxime

Hierarchically Structured Monolithic Silicalite-1 Consisting of Crystallized Nanoparticles and Its Performance in the Beckmann Rearrangement of Cyclohexanone Oxime

Direct synthesis of zeolite coatings on cordierite supports by in situ hydrothermal method

Selective Catalytic Reduction of NO by Ammonia over Raney-Ni Supported Cu-ZSM-5 I. Catalyst Activity and Stability

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