Transition metals as dopants on nickel borides: Their catalytic activity effect on hydrogenation reactions

Acosta, Delicia Ester; Ramírez, Norma Castro; Erdmann, Eleonora; Destéfanis, Hugo Alberto; Gonzo, Elio Emilio

doi:10.1016/j.cattod.2007.12.125

Cited by 19 publications

(20 citation statements)

References 20 publications

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“…51 It is acknowledged that the change in the electron density at the Fermi level can affect the dissociative chemisorption of H 2 , which will influence the hydrogenation activity in reactions where H 2 dissociation is the rate-determining step (rds). 78,88,89 3. Synthesis of metal-metalloid amorphous alloy catalysts with well defined morphologies…”

Section: Promotion Effectmentioning

confidence: 99%

Synthesis and catalysis of chemically reduced metal–metalloid amorphous alloys

et al. 2012

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Amorphous alloys structurally deviate from crystalline materials in that they possess unique short-range ordered and long-range disordered atomic arrangement. They are important catalytic materials due to their unique chemical and structural properties including broadly adjustable composition, structural homogeneity, and high concentration of coordinatively unsaturated sites. As chemically reduced metal-metalloid amorphous alloys exhibit excellent catalytic performance in applications such as efficient chemical production, energy conversion, and environmental remediation, there is an intense surge in interest in using them as catalytic materials. This critical review summarizes the progress in the study of the metal-metalloid amorphous alloy catalysts, mainly in recent decades, with special focus on their synthetic strategies and catalytic applications in petrochemical, fine chemical, energy, and environmental relevant reactions. The review is intended to be a valuable resource to researchers interested in these exciting catalytic materials. We concluded the review with some perspectives on the challenges and opportunities about the future developments of metal-metalloid amorphous alloy catalysts.

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Section: Promotion Effectmentioning

confidence: 99%

Synthesis and catalysis of chemically reduced metal–metalloid amorphous alloys

et al. 2012

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“…Its spectrum contains two bands with maxima at 682 and 399 nm ( Figure 2). These bands are typical of Ni 2+ ions in octahedral geometry assigned to the transitions 3 A 2g → 3 T 1g (F) and 3 A 2g → 3 T 1g (P) [35].…”

Section: Characterization Of Precursorsmentioning

confidence: 89%

“…These bands originate from spin-orbital transitions: 3 A 2g (F) → 3 T 1g (P) for lower wavelength and 3 A 2g (F) → 3 T 1g (F) for higher wavelength, which are associated to the octahedral structural coordination of Ni 2+ [36][37][38][39]. Commonly, besides the absorption bands that origin- ate from allowed transitions, spectra can show the absorption bands of weak intensity that can be attributed to the spin-forbidden transitions (triplet to singlet): 3 A 2g (F) → 1 E g (F) [38]. Complex band structure on the position of higher wavelength, which actually consists of two overlapping bands of similar intensity at approximately 682 and 747 nm is proof of their existence.…”

Section: Characterization Of Precursorsmentioning

confidence: 99%

Mg-Ni supported on perlite as hydrogenation catalyst: Influence of Mg and Ni content

Radonjić

Krstić

Lončarević

et al. 2019

CI&CEQ

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Article Highlights • Broken honeycomb-like perlite structure as catalyst support • Morphological, textural, and structural characteristics of Ni and Mg influence • Correlation between reducibility and hydrogen chemisorption • Evaluation of lowest reduction temperature for catalyst preparation • Catalyst behavior due to Ni and Mg influence in hydrogenation process Abstract Use of broken honeycomb-like expanded perlite as support for magnesium modified nickel catalysts in process of partial hydrogenation of sunflower oil was studied. By the use of the precipitation-deposition method, two groups of precursors were synthesized: different Ni/SiO 2 mole ratios with constant Mg/Ni mole ratio 0.1, and different Mg/Ni mole ratios with constant Ni/SiO 2 mole ratio 0.25. Characterizations of precursors were done (scanning electron microscopy, diffuse reflectance UV-Vis, infrared spectroscopy, N 2-physisorption, temperature programmed reduction (TPR) and He-pycnometry) to determine the material differences, considering the change in morphology, structure, texture and reducibility with overall Ni and Mg content. In addition, TPR and hydrogen chemisorption were performed in order to estimate the temperature reduction range of supported precursors and the dispersion degree of nickel in reduced precursors, respectively. The interaction between Ni 2+ and perlite support was established. Different reducibility and dispersion were obtained as a function of Ni/SiO 2 and Mg/Ni mole ratios. After the precursor's reduction and paraffin oil impregnation, the obtained catalysts were tested in a sunflower oil hydrogenation reaction. Catalyst activity was monitored through the decrease of the refractive index and hydrogen consumption that gave the insight that the influence on catalyst activity represents the accessibility of triacylglycerols and not always the hydrogen determined dispersion degree.

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“…21 (F) Recent efforts have been directed to study the feasibility of new materials to be used as support for boron nickel catalysts. 22…”

Section: Methodsmentioning

confidence: 99%

“…21 (F) Recent efforts have been directed to study the feasibility of new materials to be used as support for boron nickel catalysts. 22 Ni/SiO 2 -NaBH 4 is reported to achieve the reduction of different aliphatic and aromatic functional groups with 100% conversion and selectivity. …”

Section: Preparation and Propertiesmentioning

confidence: 99%

Nickel Boride

Magoo¹

2010

Synlett

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This feature focuses on a reagent chosen by a postgraduate, highlighting the uses and preparation of the reagent in current research Nickel Boride Compiled by Devanshi MagooDevanshi Magoo was born in 1983 in New Delhi, India. She received her B.Sc. degree in Chemistry from the Hindu College, University of Delhi, in 2004 and her M.Sc. in Organic Chemistry from the same university in 2006. After qualifying for the CSIR Junior Research Fellowship in 2006, she is presently working as senior research fellow towards her Ph.D. degree under the supervision of Prof. J. M. Khurana at the University of Delhi, India. Her research is focused on some novel synthetic methodologies and organic transformations along with enzyme inhibition studies.

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Transition metals as dopants on nickel borides: Their catalytic activity effect on hydrogenation reactions

Cited by 19 publications

References 20 publications

Synthesis and catalysis of chemically reduced metal–metalloid amorphous alloys

Synthesis and catalysis of chemically reduced metal–metalloid amorphous alloys

Mg-Ni supported on perlite as hydrogenation catalyst: Influence of Mg and Ni content

Nickel Boride

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