A facile method to increase metal dispersion and hydrogenation activity of Ni/SBA-15 catalysts

Ortega-Domínguez, Rodrigo Arturo; Vargas-Villagrán, H.; Peñaloza-Orta, Claudia; Saavedra-Rubio, Karen; Bokhimi, Xim; Klimova, Tatiana

doi:10.1016/j.fuel.2016.12.037

Cited by 61 publications

(37 citation statements)

References 60 publications

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“…After thermal treatment under dried air at 600 °C for 6 h, both Zn‐CHA2 and Zn,Al‐CHA samples exhibited additional bands at around 260 nm (Figure S11 b), attributed to an electronic transition with charge transfer (CT) in NiO . The position of this O 2− →Ni 2+ CT band is related to the degree of agglomeration of NiO species (note that the CT band for bulk NiO is observed at 320 nm) . The blueshift of this band observed in both samples suggests the formation of small NiO clusters .…”

Section: Figurementioning

confidence: 93%

“…After ion‐exchange for 96 h, diffuse reflectance UV/Vis spectra of the Ni 2+ ‐exchanged Zn‐CHA2 (Ni/Zn=0.62) and Zn,Al‐CHA (Ni/(Zn+0.5Al)=0.39) samples showed characteristic absorption bands correlated to Ni 2+ cations in octahedral symmetry, suggesting the presence of [Ni(H 2 O) 6 ] 2+ complexes in the samples (Figure S11 a in the Supporting Information). After thermal treatment under dried air at 600 °C for 6 h, both Zn‐CHA2 and Zn,Al‐CHA samples exhibited additional bands at around 260 nm (Figure S11 b), attributed to an electronic transition with charge transfer (CT) in NiO . The position of this O 2− →Ni 2+ CT band is related to the degree of agglomeration of NiO species (note that the CT band for bulk NiO is observed at 320 nm) .…”

Section: Figurementioning

confidence: 96%

“…The position of this O 2− →Ni 2+ CT band is related to the degree of agglomeration of NiO species (note that the CT band for bulk NiO is observed at 320 nm) . The blueshift of this band observed in both samples suggests the formation of small NiO clusters . The band observed in Zn,Al‐CHA was stronger than that in Zn‐CHA2 and had a broad shoulder between 260 and 350 nm, suggesting the higher degree of NiO agglomeration (i.e., larger clusters).…”

Section: Figurementioning

confidence: 99%

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Synthesis of New Microporous Zincosilicates with CHA Zeolite Topology as Efficient Platforms for Ion‐Exchange of Divalent Cations

Koike

Iyoki

Keoh

et al. 2017

Chemistry A European J

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There is growing interest to develop zeolite materials capable of stabilizing divalent cations such as Cu , Fe , and Ni for catalytic applications. Herein the synthesis of a new microporous zincosilicate with CHA zeolite topology is reported for the first time, by particularly focusing on the mixing procedures of the raw materials to prevent the precipitation of zinc oxides/hydroxides and the formation of impurity phases. The obtained zincosilicate CHA products possess remarkably higher ion-exchange ability for catalytically useful, divalent cations, demonstrated here using Ni as an example, compared to that of aluminosilicate and zincoaluminosilicate analogs. It is anticipated that these zincosilicate CHA materials can be an efficient platform for several important catalytic reactions. In addition, the present finding would provide a general guideline for effective substitution of other heteroatoms into the zeolite frameworks.

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Section: Figurementioning

confidence: 93%

Section: Figurementioning

confidence: 96%

Section: Figurementioning

confidence: 99%

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Synthesis of New Microporous Zincosilicates with CHA Zeolite Topology as Efficient Platforms for Ion‐Exchange of Divalent Cations

Koike

Iyoki

Keoh

et al. 2017

Chemistry A European J

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“…Furthermore, bands attributed to Ce2O3 (220-265 nm) and CeO2 (280-300 nm) [29][30][31] were found for both SBA-15 and MCM-41 samples, suggesting the presence of both type of oxides on the Ni-Ce samples. In addition, OrtegaDomínguez et al 28 indicated that the presence of NiO clusters is characterized by the band at 320 nm, while the simultaneous presence of the three bands indicated before for NiO could indicate the coexistence of species with different sizes. Taking into account that the band at ~320 nm is less intense in the case of Ni-Ce-mesoporous materials than for the zeolite-based catalysts, one can conclude that the incorporation of Ce favours the dispersion of Ni by decreasing the size of NiO species.…”

Section: Catalysts Characterizationmentioning

confidence: 93%

Micro- and mesoporous supports for CO2 methanation catalysts: A comparison between SBA-15, MCM-41 and USY zeolite

Bacariza

Graça

Bebiano

et al. 2018

Chemical Engineering Science

120

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This version is available at https://strathprints.strath.ac.uk/62298/ Strathprints is designed to allow users to access the research output of the University of Strathclyde. Unless otherwise explicitly stated on the manuscript, Copyright © and Moral Rights for the papers on this site are retained by the individual authors and/or other copyright owners. Please check the manuscript for details of any other licences that may have been applied. You may not engage in further distribution of the material for any profitmaking activities or any commercial gain. You may freely distribute both the url (https://strathprints.strath.ac.uk/) and the content of this paper for research or private study, educational, or not-for-profit purposes without prior permission or charge.Any correspondence concerning this service should be sent to the Strathprints administrator: strathprints@strath.ac.ukThe Strathprints institutional repository (https://strathprints.strath.ac.uk) is a digital archive of University of Strathclyde research outputs. It has been developed to disseminate open access research outputs, expose data about those outputs, and enable the management and persistent access to Strathclyde's intellectual output. All the results are comparable to the obtained using a HNaUSY zeolite with Si/Al=2.8 as support. Cerium incorporation on Ni/mesoporous supports allowed enhancing the CO2 conversion, especially at lower temperatures, as already reported for the zeolite-based samples.

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“…This hydrogenation step is structure sensitive. More importantly, it is a key step in decalin isomer selectivity . Ni@MCM‐3.0 shows remarkable trans‐decalin selectivity, which might be the result of the stronger adsorption of the intermediate (A), as illustrated in Figure .…”

Section: Resultsmentioning

confidence: 99%

Facile in situ Encapsulation of Highly Dispersed Ni@MCM‐41 for the Trans‐Decalin Production from Hydrogenation of Naphthalene at Low Temperature

et al. 2019

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Ni@MCM‐41 catalyst that has uniformly distributed, highly dispersed Ni nanoparticles (about 2.3 nm) was designed and successfully synthesized by in situ encapsulation of Ni in the channels of MCM‐41. This catalyst exhibits excellent thermal stability and hydrogenation activity. Water insoluble nickel acetylacetonate (Ni(acac)2) was first dissolved aqueous solution of cetyltrimethyl ammonium bromide (CTAB) and encapsulated in micelles of CTAB. Sodium silicate was used as a silicon source to rapidly hydrolyze and then wrap on the micelle surface to synthesize the MCM‐41 zeolite. The MCM‐41 zeolite encapsulating Ni(acac)2 was synthesized within a short time (4 h) at 120 °C. Compared with conventional supported catalysts, thus 3 wt.% Ni@MCM‐41 has ultra‐small uniformly distributed Ni nanoparticles and exhibits improved activity for the hydrogenation of naphthalene to decalin at very low reaction temperatures. The TOF and the apparent activation energy of Ni@MCM‐41 and the conventional catalysts (Ni/MCM‐41 and Pt/MCM‐41) were evaluated and compared. And the catalysis mechanism was analyzed. Furthermore, this Ni@MCM‐41 catalyst offers an additional advantage of selectivity in decalin isomerization; 92 % trans‐decalin selectivity was achieved at a wide temperature range.

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A facile method to increase metal dispersion and hydrogenation activity of Ni/SBA-15 catalysts

Cited by 61 publications

References 60 publications

Synthesis of New Microporous Zincosilicates with CHA Zeolite Topology as Efficient Platforms for Ion‐Exchange of Divalent Cations

Synthesis of New Microporous Zincosilicates with CHA Zeolite Topology as Efficient Platforms for Ion‐Exchange of Divalent Cations

Micro- and mesoporous supports for CO2 methanation catalysts: A comparison between SBA-15, MCM-41 and USY zeolite

Facile in situ Encapsulation of Highly Dispersed Ni@MCM‐41 for the Trans‐Decalin Production from Hydrogenation of Naphthalene at Low Temperature

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