The Transformations of n-Butane over Platinum-Promoted Mn-Aluminophosphate Molecular Sieves

Vieira, Antônio Assis; Tovar, M.A.; Pfaff, C. H.; Méndez, Bernardo; López, Carmen M.; Machado, Francisco J.; Goldwasser, J.; Agudelo, M.M. Ramírez de

doi:10.1006/jcat.1998.2039

Cited by 25 publications

(7 citation statements)

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“…Manganese-containing zeolites have been previously synthesized using metal clusters 17 and organic complexes 28 as manganese precursors, and a maximum Mn content [Mn/(Mn + Si)] of only up to 2 mol% has been achieved in Silicalite-1 zeolites, since similar to most other transition metals, manganese exhibits poor solubility under highly basic conditions. 17 Molecular sieves containing manganese have been reported to catalyse paraffin transformation, 29 benzene amination, 30 one-step 3-caprolactone synthesis, 31 and the highly selective oxidation of benzyl alcohol to benzaldehyde. 32 Here, an Mn-Si mixed oxide composite material was prepared by mechanochemical treatment and was used as a reactant to prepare Mn-Silicalite-1 zeolites.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of Silicalite-1 zeolites with high manganese contents from mechanochemically pretreated reactants

et al. 2015

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Section: Introductionmentioning

confidence: 99%

Preparation and characterization of Silicalite-1 zeolites with high manganese contents from mechanochemically pretreated reactants

et al. 2015

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“…The texture properties of different samples are measured by N 2 adsorption‐desorption experiment and the results are listed in Table . Compared to parent Beta zeolites, the specific surface area, micropore volume and microporous area of different catalysts slightly reduce due to the fact that some Pd NPs block a small amount of micropores of Beta zeolite . However, the external surface area of all catalysts substantially remains unchanged.…”

Section: Resultsmentioning

confidence: 99%

The Influence of Size and Shape of Pd Nanoparticles on the Performances of Pd/Beta Catalysts for n‐Heptane Hydroisomerization

Chen

Liu²,

Yin

et al. 2019

ChemCatChem

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Several Pd/Beta catalysts with cubic (9 nm, 12 nm, 16 nm) and truncated-octahedral (18 nm) Pd nanoparticles (NPs) were prepared to investigate the effect of size and shape of Pd NPs for n-heptane hydroisomerization. Characterizations confirmed that the cubic Pd NPs solely exposed {100} crystal plane and truncated-octahedral Pd NPs were enclosed by {100} and {111} crystal planes, and that the desorption temperature of subsurface hydrogen on Pd NPs showed size and shape dependence.Hydroisomerization results exhibits that the catalyst with 9 nm cubic Pd NPs displayed the higher isomers selectivity compared to the catalyst with 12 nm cubic NPs, 18 nm truncated octahedral NPs and 16 nm cubic NPs at similar conversion. This result suggested the size and shape dependence of (de) hydrogenation activity of Pd NPs, and further revealed the key role of subsurface hydrogen in determining the (de)hydrogenation activity.interactions between slabs. The 3 × 3 × 1 Monkhorst-Pack k-point grid was used in the two surfaces for the Brillouin zone sampling.

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“…Figure 5 presents the conversion and the isomer yield of n-dodecane hydroisomerization over the 0.5 wt.% Pt/ MgAPO-11 as a function of Mg content. When the Mg content was zero, the Pt/AlPO-11 catalyst was lack of strong acid sites needed to perform the acid cracking and skeleton isomerization of n-dodecane, and the main reaction was C-C bond breakage on the Pt sites [16]. So the activity (4%) and the isomer yield (1%) were both very low.…”

Section: Interaction Between Pt and The Molecular Sievesmentioning

confidence: 98%

“…Other elements, such as the Me 2+ ions, can also be substituted into the AlPO-11 framework and generate the Brønsted acid sites. These substituted materials can then be used in the acid-catalyzed conversion of n-alkanes [16][17][18][19]. Hartmann and Elangovan have studied the influence of the pore diameter of magnesium-containing molecular sieves on the product selectivity of n-decane conversion.…”

Section: Introductionmentioning

confidence: 99%

Performance of Pt/MgAPO-11 Catalysts in the Hydroisomerization of n-dodecane

Yang

Tian

et al. 2006

Catal Lett

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MgAPO-11 molecular sieves with varying Mg contents synthesized by the hydrothermal method were used as supports for bifunctional Pt/MgAPO-11 catalysts. MgAPO-11 molecular sieves and the corresponding catalysts were characterized by X-ray diffraction (XRD), X-ray fluorescence spectroscopy (XRF), temperature-programmed desorption of NH 3 (NH 3 -TPD), differential thermogravimetric (DTG) analysis, temperature-programmed reduction of H 2 (H 2 -TPR), H 2 chemisorption and catalytic reaction evaluation. The results indicated that the acidity generated via the substitution of Mg 2+ for Al 3+ in the framework increased with the Mg content. Acting as acidic components, the MgAPO-11 molecular sieves loaded with Pt were tested in the hydroisomerization of n-dodecane. Optimum isomer yield was obtained over the Pt/MgAPO-11 catalyst that had neither the highest acidity nor the highest Pt loading among the tested catalysts. In fact, the activity and the isomer yield both could attain a maximum on 0.5 wt.% Pt/MgAPO-11 catalysts with differing Mg contents. A lower Mg content resulted in an insufficient acidity, whilst a higher Mg content weakened the dehydrogenation/hydrogenation function of the Pt. These inappropriate balances between the acidic and the metallic functions of the catalysts would lead to low activities and isomer yields. On the other hand, the 0.5 wt.% Pt/MgAPO-11(3) catalyst was found to have a good balance between the acidic and the metallic functions, and thus exhibited both high activity and isomer yield in comparison with the conventional 0.5 wt.% Pt/SAPO-11 catalyst.

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The Transformations of n-Butane over Platinum-Promoted Mn-Aluminophosphate Molecular Sieves

Cited by 25 publications

References 48 publications

Preparation and characterization of Silicalite-1 zeolites with high manganese contents from mechanochemically pretreated reactants

Preparation and characterization of Silicalite-1 zeolites with high manganese contents from mechanochemically pretreated reactants

The Influence of Size and Shape of Pd Nanoparticles on the Performances of Pd/Beta Catalysts for n‐Heptane Hydroisomerization

Performance of Pt/MgAPO-11 Catalysts in the Hydroisomerization of n-dodecane

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