Hydrogenation of 1-octene over skeletal Pd catalysts prepared from Pd–Zr amorphous alloys and the effect of Ni addition

Nozaki, Ai; Tanihara, Yasutomo; Kuwahara, Yasutaka; Ohmichi, Tetsutaro; Mori, Kohsuke; Nagase, Takeshi; Yasuda, Hiroyuki; Yamashita, Hiromi

doi:10.1016/j.cattod.2015.07.044

Cited by 7 publications

(6 citation statements)

References 44 publications

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“…Furthermore, no isomers were identified in the reaction products by gas chromatography (GC) which confirms that the catalyst is only selective toward the formation of the hydrogenated product ( n -octane). The metallic nickel active site role is only in the selective hydrogenation, opposite to the metallic Ni reported in the literature to migrate double bonds and produce isomeric products. , This evidence indicates that the high Ni dispersion in the MFI channels is responsible for the selective hydrogenation . The catalysts also showed a high stability for a duration of 96 h.…”

Section: Resultsmentioning

confidence: 73%

“…The metallic nickel active site role is only in the selective hydrogenation, opposite to the metallic Ni reported in the literature to migrate double bonds and produce isomeric products. 67,68 This evidence indicates that the high Ni dispersion in the MFI channels is responsible for the selective hydrogenation. 68 The catalysts also showed a high stability for a duration of 96 h.…”

Section: Industrial and Engineering Chemistry Researchmentioning

confidence: 91%

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Production of Highly Dispersed Ni within Nickel Silicate Materials with the MFI Structure for the Selective Hydrogenation of Olefins

Sebakhy

Vitale

Pereira‐Almao

2019

Ind. Eng. Chem. Res.

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Aluminum-free Ni-incorporated MFI zeolite materials were synthesized in a batch reactor under mild reaction conditions using the hydrothermal method and were proven to exhibit highly active sites for the saturation of aromatics and olefinic molecules due to the high dispersion of the Ni species. The synthesized solid materials were characterized by various methods, and computational modeling aided in understanding the Ni dispersion in the MFI framework. The novelty of this study is corroborated to the unprecedented hydrogenation activity of the Ni-MFI materials when tested with a 1-octene model molecule at 0.48 MPa H2 pressure and moderate temperatures (423–473 K). Another important aspect of this work is the significant elimination of olefinic molecules from a sulfur-rich industrial cracked naphtha feedstock when using extrudates of the same material, which enforces that Ni-MFI could be commercially applied in industry for the selective hydrogenation of olefins present in light petroleum streams.

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Section: Resultsmentioning

confidence: 73%

Section: Industrial and Engineering Chemistry Researchmentioning

confidence: 91%

Production of Highly Dispersed Ni within Nickel Silicate Materials with the MFI Structure for the Selective Hydrogenation of Olefins

Sebakhy

Vitale

Pereira‐Almao

2019

Ind. Eng. Chem. Res.

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“…In the product stream no isomers of 1octene were observed which is an important observation when compared with noble metal catalysts in which isomerization is observed. 55,56 It has also been previously reported in the literature that metallic Ni promotes olefins isomerization via double-bond migration during olefins hydrogenation at low pressure, however it seems that the Ni on our nanoaegirine surface is only active for hydrogenation. 57 The activity of both catalysts (i.e., 2.5Ni-AEG-12 and 2.5Ni-AEG-25) for 1-octene hydrogenation was almost similar at a WHSV of 0.43 h −1 .…”

Section: Acs Applied Nano Materialsmentioning

confidence: 51%

Dispersed Ni-Doped Aegirine Nanocatalysts for the Selective Hydrogenation of Olefinic Molecules

Sebakhy

Vitale

Pereira‐Almao

2018

ACS Appl. Nano Mater.

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A mild hydrothermal route was employed for the first time to prepare pure synthetic aegirine nanocatalysts with high dispersion of the nickel species, different Ni contents, low-temperature reducibility of the Ni2+ species, and two average nanocrystalline domain sizes of 12 and 25 nm. The developed method allowed the formation of a novel nanocarrier for nickel that induced a well dispersion of the metal and its protection from sulfur poisoning. The nanocrystalline aegirine materials were fully characterized by XRD, BET, SEM-EDX, HRTEM, FT-IR, ICP, TGA, and TPR in order to confirm the aegirine structure and particle morphology. In this study, the synthetic Ni-nanoaegirine materials were tested as a nanocatalyst for the selective hydrogenation of aromatics (toluene) and olefins (1-octene) at low H2 pressures (70 psig) and moderate temperatures (140–200 °C). The hydrogenation activity of the synthesized materials was assessed and it was found that the 12 nm Ni-aegirine materials were more active than the 25 nm catalysts at the same Ni loading. The difference in catalytic activity might be attributed to the difference in crystalline domain sizes and the number of small active centers created on the surface because of the high dispersion obtained for the nickel during the hydrothermal crystallization. Furthermore, Ni-aegirine nanocatalysts were very selective toward the hydrogenation of 1-octene in a 50 wt % 1-octene/toluene mixture with almost no toluene saturation indicating the importance of having developed small nickel sites on the surface. The 2.5Ni-AEG-25 nanocatalysts could be selected as a catalyst of choice to replace expensive noble metal catalysts for 1-octene hydrogenation with minimal toluene saturation. It also seems that the hydrogenation activity was enhanced by increasing the surface area of the catalyst and promoted by the high metallic dispersion of the Ni clusters on the surface of the carrier. The catalyst in this study is proposed as a candidate for olefins elimination from light hydrocarbon streams to prevent the formation of gums and deposits with no significant aromatics hydrogenation, as was demonstrated when using a real naphtha feedstock.

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“…Recently, we reported that the atomic arrangement of a precursor dramatically affects the structure and catalytic properties of the resultant nanoporous metal catalysts. We found that using an amorphous alloy as the precursor for a nanoporous metal catalyst leads to a finer structure than that formed using the corresponding crystalline alloy owing to the high corrosion resistance of the amorphous alloy. − It is expected that CeO 2 with a fine porous structure would be obtained using an amorphous alloy as a precursor as well. Aluminum (Al) has known to be an element which can form amorphous alloy with Ce, albeit within a limited range of composition (7%–10% Ce) and Al can be easily extracted from the alloy by chemical treatment in basic solutions.…”

Section: Introductionmentioning

confidence: 93%

Oxidation of Benzyl Alcohol over Nanoporous Au–CeO₂ Catalysts Prepared from Amorphous Alloys and Effect of Alloying Au with Amorphous Alloys

Nozaki

Yasuoka

Kuwahara

et al. 2018

Ind. Eng. Chem. Res.

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Au−CeO 2 catalysts are prepared from amorphous Ce−Al alloys by the dealloying method, and their catalytic performances are examined in the oxidation of benzyl alcohol to benzaldehyde using O 2 as an oxidant. The catalytic activity of the Au−CeO 2 catalysts is improved using an amorphous alloy as a precursor, and further improved activity is attained by directly alloying Au with Ce−Al rather than by depositing Au on preformed CeO 2 . Consequently, Au−CeO 2 prepared directly from an amorphous Au−Ce−Al alloy exhibits the highest activity among the prepared samples, despite its low surface area. Detailed characterization by means of XPS analysis indicates that most of the Au species in Au−CeO 2 prepared from the amorphous Au−Ce−Al alloy exist in a +1 oxidation state (Au + ). The presence of Au + facilitates the migration of oxygen atoms through the lattice, which likely contributes to the high catalytic activity of the Au−CeO 2 catalyst.

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Hydrogenation of 1-octene over skeletal Pd catalysts prepared from Pd–Zr amorphous alloys and the effect of Ni addition

Cited by 7 publications

References 44 publications

Production of Highly Dispersed Ni within Nickel Silicate Materials with the MFI Structure for the Selective Hydrogenation of Olefins

Production of Highly Dispersed Ni within Nickel Silicate Materials with the MFI Structure for the Selective Hydrogenation of Olefins

Dispersed Ni-Doped Aegirine Nanocatalysts for the Selective Hydrogenation of Olefinic Molecules

Oxidation of Benzyl Alcohol over Nanoporous Au–CeO₂ Catalysts Prepared from Amorphous Alloys and Effect of Alloying Au with Amorphous Alloys

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Hydrogenation of 1-octene over skeletal Pd catalysts prepared from Pd–Zr amorphous alloys and the effect of Ni addition

Cited by 7 publications

References 44 publications

Production of Highly Dispersed Ni within Nickel Silicate Materials with the MFI Structure for the Selective Hydrogenation of Olefins

Production of Highly Dispersed Ni within Nickel Silicate Materials with the MFI Structure for the Selective Hydrogenation of Olefins

Dispersed Ni-Doped Aegirine Nanocatalysts for the Selective Hydrogenation of Olefinic Molecules

Oxidation of Benzyl Alcohol over Nanoporous Au–CeO2 Catalysts Prepared from Amorphous Alloys and Effect of Alloying Au with Amorphous Alloys

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Oxidation of Benzyl Alcohol over Nanoporous Au–CeO₂ Catalysts Prepared from Amorphous Alloys and Effect of Alloying Au with Amorphous Alloys