Palladium(0) nanoparticles supported on silica-coated cobalt ferrite: A highly active, magnetically isolable and reusable catalyst for hydrolytic dehydrogenation of ammonia borane

Akbayrak, Serdar; Kaya, Murat; Volkan, Mürvet; Özkâr, Saim

doi:10.1016/j.apcatb.2013.09.023

Cited by 141 publications

(55 citation statements)

References 39 publications

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“…As shown in Figure A, the increase in temperature facilitates the reaction rate. Ea is calculated to be 35.3 kJ mol −1 based on Arrhenius equation and the plot shown in Figure B, which is lower than many Pd‐based catalysts including Pd(0)/CoFe 2 O 4, Pd(0)/SiO 2 ‐CoFe 2 O 4, RGO/Pd(0), Pd(0)/Zeolite, Pd(0)‐HAP, Pd(0)/CeO 2, RGO‐Ni 30 Pd(0) 70 , and Pd(0)/CS‐Fe 3 O 4 (Table ), etc.…”

Section: Resultsmentioning

confidence: 91%

Graphitic carbon nitride‐chitosan composites–anchored palladium nanoparticles as high‐performance catalyst for ammonia borane hydrolysis

et al. 2018

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Summary The novel composites consisting of graphitic carbon nitride and chitosan (denoted as g‐C3N4‐CS) is synthesized for anchoring palladium nanoparticles. The results reveal that the resultant catalysts possess superior catalytic activity for ammonia borane (AB) hydrolysis. The corresponding turnover frequency reaches up to 27.7 molnormalH2·molPd−1·min−1at 30.0°C, and the activation energy is as low as 35.3 kJ mol−1. Kinetics study reveals that the hydrolysis reaction is 0.50 and 0.68 orders with AB concentration and palladium concentration, respectively. In addition, the catalytic activity of the resultant Pd(0)/g‐C3N4‐CS catalysts is stable even after 10 runs. The result will be helpful for the development of hydrogen generation and functional materials.

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Section: Resultsmentioning

confidence: 91%

Graphitic carbon nitride‐chitosan composites–anchored palladium nanoparticles as high‐performance catalyst for ammonia borane hydrolysis

et al. 2018

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“…The TOF of Pd 74 Ni 26 /MCN is determined to be 246.8 min −1 , which is about 73‐fold higher than that of the free Pd 67 Ni 33 NPs. The activity of Pd 74 Ni 26 /MCN is higher than other Pd‐based catalysts (Table ), [1, 13, 24, 26, 40–50] but only slightly lower than that of Pd/SiO 2 ‐CoFe 2 O 4 (254 min −1 ) . Notably, CoFe 2 O 4 was not considered in the TOF calculation because CoFe 2 O 4 was found to be inactive in the hydrolysis of AB .…”

Section: Resultsmentioning

confidence: 99%

“…The activity of Pd 74 Ni 26 /MCN is higher than other Pd‐based catalysts (Table ), [1, 13, 24, 26, 40–50] but only slightly lower than that of Pd/SiO 2 ‐CoFe 2 O 4 (254 min −1 ) . Notably, CoFe 2 O 4 was not considered in the TOF calculation because CoFe 2 O 4 was found to be inactive in the hydrolysis of AB . However, NiCo 2 O 4 was used as catalyst in this reaction recently .…”

Section: Resultsmentioning

confidence: 99%

Mesoporous Carbon Nitride Supported Pd and Pd‐Ni Nanoparticles as Highly Efficient Catalyst for Catalytic Hydrolysis of NH₃BH₃

Wang

Luo

et al. 2018

ChemCatChem

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Highly dispersed Pd and PdNi nanoparticles (NPs) have been successfully immobilized on mesoporous carbon nitride (MCN) through a facile co‐reduction approach. The resulting Pd/MCN catalyst shows excellent catalytic performance for hydrogen release from an ammonia borane (AB) aqueous solution with a turnover frequency (TOF) value of 125 mol H2 mol metal−1 min−1 at room temperature, which is among the highest values for monometallic Pd‐based catalysts reported to date. The catalytic performance of the Pd NPs can be further enhanced by alloying with Ni or Co atoms. Among all the synthesized PdxNi100−x/MCN nanocomposites (NCs) with different Ni/Pd ratios, the Pd74Ni26/MCN catalyst exhibits the best catalytic performance with a TOF of 246.8 mol H2 mol metal−1 min−1. The high activity of Pd/MCN and Pd74Ni26/MCN are largely dependent on the features of the ultrafine metallic NPs immobilized by MCN, the interfacial interaction between the MCN matrix and metallic NPs, and the accessible open porous structure for mass transfer.

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“…Pure or alloyed cobalt (as oxide or reduced form) has been addressed in the recent literature as a promising metal in the AB decomposition reaction due to its low cost (compared with noble metals) and its high activity in relevant reactions. 12,16,[19][20][21] Due to their different reduction potential (compared with Pd), when M-Pd (i. e. Cu or Co) are wellalloyed there is a charge transfer from the M to Pd increasing the electron density on the Pd atom and its activity in the AB decomposition is enhanced. 1, 18 On the other hand, the use of an active support (under UV-Vis conditions), such as titania or a titano-silicate (Ti-SiO 2 ), is an available strategy to enhance the catalytic activity of the final catalytic system.…”

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confidence: 99%

Enhanced ammonia-borane decomposition by synergistic catalysis using CoPd nanoparticles supported on titano-silicates

et al. 2016

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The decomposition of small molecules (such as formic acid or ammonia-borane (AB)) is one of the most promising alternatives for the in-situ H 2 generation towards a H 2 scenario implementation. 1-3 AB is claimed as one of the inorganic compounds with the highest hydrogen content (19.6 H 2 wt. %). This, added to its high reactivity with noble metals (such as Ru, Pd or Pt) makes it one of the best candidates for its use as H 2 feed in a PEMFC. [3][4][5][6][7][8] The total decomposition of this compound in liquid phase using water as solvent produces 3 mol of H 2 per mol of AB according to the following reaction equation.Ammonia borane is a liquid-phase chemical hydrogen storage material with great current interest. Its decomposition on a wide range of catalysts has been extensively reported in the literature. Among these, noble metals such as Rh, Ir, Ru, and Pt, have shown interesting catalytic activities, 10 but they are unsuitable for widespread practical applications due to their availability and price. Previous studies have demonstrated that bimetallic nanoparticles combining a noble metal and a firstrow transition metal forming an alloy structure could be promising candidates for the design of catalysts for the hydrolysis of ammonia borane. 11In order to assess the beneficial effect of these noble metal/first-row transition metal combinations for this application, we have used Pd due to its moderate activity among noble metals 12 and Co because it shows the highest activity among non-noble metal catalysts. 11,13,14The enhancement of the catalytic activity of the supported noble metal can be attained by different routes; i) increasing the metal dispersion on the support by the synthesis of very small NPs, 15 ii) alloying the noble metal with a transition metal, (which is also attractive due to the cost reduction of the catalysts) 11,16,17 and iii) supporting the NPs on an UV-Vis active support to upgrade the electron-transfer from the support to the NPs. 1,18 In the present study, the synthesis of Pd and Co-PdNPs by the reduction-by-solvent methodology has been applied with successful results in the production of H 2 by AB decomposition. The synthesis conditions allow a perfect control over size and morphology of the NPs (both mono-and bimetallic). Pure or alloyed cobalt (as oxide or reduced form) has been addressed in the recent literature as a promising metal in the AB decomposition reaction due to its low cost (compared with noble metals) and its high activity in relevant reactions. 12,16,[19][20][21] Due to their different reduction potential (compared with Pd), when M-Pd (i. e. Cu or Co) are wellalloyed there is a charge transfer from the M to Pd increasing the electron density on the Pd atom and its activity in the AB decomposition is enhanced. 1,18 On the other hand, the use of an active support (under UV-Vis conditions), such as titania or a titano-silicate (Ti-SiO 2 ), is an available strategy to enhance the catalytic activity of the final catalytic system. 22,23In the present work, Pd and Co x Pd 1-x...

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Palladium(0) nanoparticles supported on silica-coated cobalt ferrite: A highly active, magnetically isolable and reusable catalyst for hydrolytic dehydrogenation of ammonia borane

Cited by 141 publications

References 39 publications

Graphitic carbon nitride‐chitosan composites–anchored palladium nanoparticles as high‐performance catalyst for ammonia borane hydrolysis

Graphitic carbon nitride‐chitosan composites–anchored palladium nanoparticles as high‐performance catalyst for ammonia borane hydrolysis

Mesoporous Carbon Nitride Supported Pd and Pd‐Ni Nanoparticles as Highly Efficient Catalyst for Catalytic Hydrolysis of NH₃BH₃

Enhanced ammonia-borane decomposition by synergistic catalysis using CoPd nanoparticles supported on titano-silicates

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Palladium(0) nanoparticles supported on silica-coated cobalt ferrite: A highly active, magnetically isolable and reusable catalyst for hydrolytic dehydrogenation of ammonia borane

Cited by 141 publications

References 39 publications

Graphitic carbon nitride‐chitosan composites–anchored palladium nanoparticles as high‐performance catalyst for ammonia borane hydrolysis

Graphitic carbon nitride‐chitosan composites–anchored palladium nanoparticles as high‐performance catalyst for ammonia borane hydrolysis

Mesoporous Carbon Nitride Supported Pd and Pd‐Ni Nanoparticles as Highly Efficient Catalyst for Catalytic Hydrolysis of NH3BH3

Enhanced ammonia-borane decomposition by synergistic catalysis using CoPd nanoparticles supported on titano-silicates

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Mesoporous Carbon Nitride Supported Pd and Pd‐Ni Nanoparticles as Highly Efficient Catalyst for Catalytic Hydrolysis of NH₃BH₃