Inside Cover: Improving Hydrothermal Carbonization by Using Poly(ionic liquid)s (Angew. Chem. Int. Ed. 23/2013)

Zhang, Pengfei; Yuan, Jiayin; Fellinger, Tim‐Patrick; Antonietti, Markus; Li, Haoran; Wang, Yong

doi:10.1002/anie.201303272

Cited by 20 publications

(22 citation statements)

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“…For anhydrous CsN 5 , Cs transfers maximum negative charge to the N 5 rings to enable both aromaticity of the cyclo ‐N 5 − and ionic bonding between Cs cations and cyclo ‐N 5 − . While for the 3D metal‐ cyclo ‐N 5 − frameworks [Na 8 (N 5 ) 8 (H 2 O) 3 ] n and MPF‐1, every cyclo ‐N 5 − ring was stabilized by five coordination bonds from five sodium cations.…”

Section: Figurementioning

confidence: 99%

Stabilization of the Pentazolate Anion in Three Anhydrous and Metal‐Free Energetic Salts

Lin

Wang

et al. 2018

Chemistry An Asian Journal

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According to previous reports, metal cations or water molecules are necessary for the stabilization of pentazolate anion (cyclo-N ) at ambient temperature and pressure. Seeking a new method to stabilize N is a big challenge. In this work, three anhydrous, metal-free energetic salts based on cyclo-N 3,9-diamino-6,7-dihydro-5 H-bis([1,2,4]triazolo)[4,3-e:3',4'-g][1,2,4,5] tetrazepine-2,10-diium, N-carbamoylguanidinium, and oxalohydrazinium (oxahy ) pentazolate were synthesized and isolated. All salts were characterized by elemental analysis, IR spectroscopy, H, C, and (in some cases) N NMR spectroscopy, thermal analysis (TGA and DSC), and single-crystal XRD analysis. Computational studies associated with heats of formation and detonation performance were performed by using Gaussian 09 and Explo5 programs, respectively. The sensitivity of the salts towards impact and friction was determined, and overall the real N explosives showed promising energetic properties.

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Section: Figurementioning

confidence: 99%

Stabilization of the Pentazolate Anion in Three Anhydrous and Metal‐Free Energetic Salts

Lin

Wang

et al. 2018

Chemistry An Asian Journal

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“…Highly monodisperse PdAg bimetallic alloy nanoparticles were prepared by simultaneous reduction of Pd(NO 3 ) 2 and AgNO 3 by using oleylamine as solvent, surfactant, and reducing agent. [ 19 ] In a typical synthesis, Pd(NO 3 ) 2 and AgNO 3 were co-dissolved in 20 mL of oleylamine placed in a three-necked fl ask equipped with a condenser and stir bar. The solution was heated to 170 °C under fl owing N 2 and kept at this condition for 2 h in an oil bath.…”

Section: Synthesis and Characterization Of Pdag Bimetallic Alloy Nanomentioning

confidence: 99%

Highly Active and Durable PdAg@Pd Core–Shell Nanoparticles as Fuel‐Cell Electrocatalysts for the Oxygen Reduction Reaction

Jiang

Gao

et al. 2016

Part & Part Syst Charact

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By controlling the surface structure and composition at the atomic level, the catalytic properties of bimetallic alloy catalysts can be precisely and effectively tuned, and their activity and durability can be enhanced. Here, a class of highly active and durable PdAg bimetallic alloy nano‐electrocatalysts is demonstrated by tuning the surface composition through a simple electrochemical treatment process in acid medium. Transmission electron microscopy, X‐ray photoelectron spectroscopy, and cyclic voltammogram measurements clearly show the well‐defined core–shell structure that consists of a PdAg alloy core and a few atomic layers of Pd as the shell (PdAg@Pd). Compared to pure Pd and Ag catalysts, the prepared PdAg@Pd/C exhibits enhanced electrocatalytic activity and durability for the oxygen reduction reaction in alkaline media. According to the theoretical and experimental results, the enhanced electrocatalytic activity can be attributed to the synergistic effects between the Pd and the Ag, while the durability is ascribed to the unique alloy core–ultrathin‐Pd‐shell structure of the PdAg@Pd/C catalyst. This study not only proposes a simple and straightforward approach for preparing highly monodisperse PdAg alloy nanoparticles and designing advanced electrocatalysts for fuel cells, but also demonstrates the crucial effect of electrochemical treatment on the electrocatalytic properties of catalysts.

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“…Although the promoting effects of Co, Ni and Ag have already been reported, to the best of our knowledge, no attempt has been made to prepare FAD catalyst by seq-impregnation method. 21,27,28 Although none of monometallic catalyst except Pd shows any catalytic activity for FAD reaction (Fig. S1 †), De et al variously showed the role of Ni in inducing the modication of surface properties of bimetallic catalysts.…”

Section: Introductionmentioning

confidence: 98%

Investigation on the enhanced catalytic activity of a Ni-promoted Pd/C catalyst for formic acid dehydrogenation: effects of preparation methods and Ni/Pd ratios

Kim

2018

RSC Adv.

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In this present work, we studied the effects of preparation methods and Ni/Pd ratios on the catalytic activity of a Ni-promoted Pd/C catalyst for the formic acid dehydrogenation (FAD) reaction. Two catalysts prepared by co-impregnation and sequential impregnation methods showed completely different Pd states and catalytic activities. As the sequentially impregnated catalyst showed better activity than the coimpregnated catalyst, the sequentially impregnated catalyst was investigated further to optimize the ratio of Ni/Pd. The highest catalytic activity for the FAD reaction was obtained over the seq-impregnated catalyst having a 1 : 1.3 molar ratio of Pd : Ni. The results of X-ray diffraction (XRD) and transmission electron microscopy (TEM) showed that small particle size is one factor improving the catalytic activity, while those of X-ray photoelectron spectroscopy (XPS) and X-ray adsorption near edge structure (XANES) indicate that the electronic modification of Pd to a positively charged ion is another factor. Thus, it can be concluded that the enhanced catalytic activity of the Ni-promoted Pd/C catalyst is attributed to the role of pre-impregnated Ni in facilitating the activity of Pd by constraining the particle growth and withdrawing an electron from Pd. Fig. 1 Schematic diagram of preparation processes of (a) coimpregnated and (b) seq-impregnated catalysts.Fig. 2 (a) Volumes of produced gas over the 0.05 g of various Pd-Ni bimetallic catalysts during the reaction of 10 mL formic acid (1 M) at 60 C and (b) their initial rates after stabilization (from 3 to 4 min) depending on the molar ratio of Ni/Pd (x).This journal is Fig. 8 (a) Catalytic activity test (10 mL 1 M formic acid at 60 C) over recycled Pd 1 /NiO 1.3 /C (seq) and its (b) TEM images and (c) particle size distribution with average particle size.This journal is

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Inside Cover: Improving Hydrothermal Carbonization by Using Poly(ionic liquid)s (Angew. Chem. Int. Ed. 23/2013)

Cited by 20 publications

References 0 publications

Stabilization of the Pentazolate Anion in Three Anhydrous and Metal‐Free Energetic Salts

Stabilization of the Pentazolate Anion in Three Anhydrous and Metal‐Free Energetic Salts

Highly Active and Durable PdAg@Pd Core–Shell Nanoparticles as Fuel‐Cell Electrocatalysts for the Oxygen Reduction Reaction

Investigation on the enhanced catalytic activity of a Ni-promoted Pd/C catalyst for formic acid dehydrogenation: effects of preparation methods and Ni/Pd ratios

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