Bimetallic PdCo Nanoparticles Loaded in Amine Modified Polyacrylonitrile Hollow Spheres as Efficient Catalysts for Formic Acid Dehydrogenation

Polyacrylonitrile hollow nanospheres (HPAN), derived from the polymerization of acrylonitrile in the presence of polystyrene emulsion (as template), were modified by surface amination with ethylenediamine (EDA), and then used as support for loading Pd or PdCo nanoparticles (NPs). The resultant bimetallic catalyst (named PdCo0.2/EDA-HPAN) can efficiently catalyze the additive-free dehydrogenation of formic acid with very high activity, selectivity and recyclability, showing turnover frequencies (TOF) of 4990 h−1 at 333 K and 915 h−1 at 303 K, respectively. The abundant surface amino groups and cyano group as well as the hollow structure of the support offer a suitable environment for achieving high dispersion of the Pd-based NPs on the surface of EDA-HPAN, thus generating ultra-small bimetallic NPs (bellow 1.0 nm) with high stability. The addition of a small portion of Co may adjust the electronic state of Pd species to a certain extent, which can further improve their capability for the dehydrogenation of formic acid. In addition, the surface amino groups may also play an important role in synergistically activating formic acid to generate formate, thus leading to efficient conversion of formic acid to hydrogen at mild conditions.

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Additive-Free Formic Acid Dehydrogenation Catalyzed by a Cobalt Complex

Organometallics ◽

10.1021/acs.organomet.0c00777 ◽

2021 ◽

Author(s):

Nicolas Lentz ◽

Alicia Aloisi ◽

Pierre Thuéry ◽

Emmanuel Nicolas ◽

Thibault Cantat

Keyword(s):

Formic Acid ◽

Cobalt Complex ◽

Formic Acid Dehydrogenation

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Deciphering the Mechanistic Details of Manganese-Catalyzed Formic Acid Dehydrogenation: Insights from DFT Calculations

Inorganic Chemistry ◽

10.1021/acs.inorgchem.1c00757 ◽

2021 ◽

Author(s):

Neethinathan Johnee Britto ◽

Madhavan Jaccob

Keyword(s):

Dft Calculations ◽

Formic Acid ◽

Formic Acid Dehydrogenation

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CdS Nanorods Anchored with Crystalline FeP Nanoparticles for Efficient Photocatalytic Formic Acid Dehydrogenation

ACS Applied Materials & Interfaces ◽

10.1021/acsami.1c04178 ◽

2021 ◽

Author(s):

Taotao Wang ◽

Lechen Yang ◽

Daochuan Jiang ◽

Hongyun Cao ◽

Antony Charles Minja ◽

...

Keyword(s):

Formic Acid ◽

Cds Nanorods ◽

Formic Acid Dehydrogenation

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Modelling the atmosphere of lava planet K2-141b: implications for low- and high-resolution spectroscopy

Monthly Notices of the Royal Astronomical Society ◽

10.1093/mnras/staa2487 ◽

2020 ◽

Vol 499 (4) ◽

pp. 4605-4612

Author(s):

T Giang Nguyen ◽

Nicolas B Cowan ◽

Agnibha Banerjee ◽

John E Moores

Keyword(s):

Steady State ◽

Ocean Circulation ◽

Scale Height ◽

High Resolution Spectroscopy ◽

Return Flow ◽

High Dispersion ◽

Magma Ocean ◽

Steady State Flow ◽

Wide Range ◽

Very High

ABSTRACT Transit searches have uncovered Earth-size planets orbiting so close to their host star that their surface should be molten, so-called lava planets. We present idealized simulations of the atmosphere of lava planet K2-141b and calculate the return flow of material via circulation in the magma ocean. We then compare how pure Na, SiO, or SiO2 atmospheres would impact future observations. The more volatile Na atmosphere is thickest followed by SiO and SiO2, as expected. Despite its low vapour pressure, we find that a SiO2 atmosphere is easier to observe via transit spectroscopy due to its greater scale height near the day–night terminator and the planetary radial velocity and acceleration are very high, facilitating high dispersion spectroscopy. The special geometry that arises from very small orbits allows for a wide range of limb observations for K2-141b. After determining the magma ocean depth, we infer that the ocean circulation required for SiO steady-state flow is only 10−4 m s−1, while the equivalent return flow for Na is several orders of magnitude greater. This suggests that a steady-state Na atmosphere cannot be sustained and that the surface will evolve over time.

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Synthesis of palladium-rhodium bimetallic nanoparticles for formic acid dehydrogenation

Journal of Energy Chemistry ◽

10.1016/j.jechem.2020.04.031 ◽

2021 ◽

Vol 52 ◽

pp. 301-309

Author(s):

Ilaria Barlocco ◽

Sofia Capelli ◽

Elisa Zanella ◽

Xiaowei Chen ◽

Juan J. Delgado ◽

...

Keyword(s):

Formic Acid ◽

Bimetallic Nanoparticles ◽

Formic Acid Dehydrogenation

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Preparation of hollow Fe3O4 spheres through a facile method and their applications

Functional Materials Letters ◽

10.1142/s1793604717500758 ◽

2017 ◽

Vol 10 (06) ◽

pp. 1750075 ◽

Cited By ~ 2

Author(s):

Xingping Wu ◽

Aiping Zhu ◽

Zhaodong Nan

Keyword(s):

Saturation Magnetization ◽

Ostwald Ripening ◽

Solvothermal Method ◽

Hollow Spheres ◽

Hollow Structure ◽

Solid Sphere ◽

Small Particles ◽

Potential Applications ◽

One Step ◽

Solid Spheres

Fe3O4 hollow microspheres with good dispersibility and high saturation magnetization were synthesized through a facile one-step solvothermal method. The formation mechanism of the hollow structure was studied by taking time-dependent experiments. Porous [Formula: see text]-FeOOH and [Formula: see text]-Fe2O3 nanosheets were firstly fabricated. Fe3O4 solid spheres aggregated by small particles were obtained from the transition of [Formula: see text]-FeOOH and [Formula: see text]-Fe2O3. Finally, the solid sphere is transferred to hollow sphere through Ostwald ripening. The maximum saturation magnetization of the hollow spheres is [Formula: see text][Formula: see text]emu/g, which is higher than some results reported in references. The Fe3O4 hollow spheres show potential applications in microwave absorption and photocatalysis.

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Amine-functionalized carbon nanotubes supported NiAuPd nanoparticles as an efficient in-situ prepared catalyst for formic acid dehydrogenation

International Journal of Hydrogen Energy ◽

10.1016/j.ijhydene.2021.08.063 ◽

2021 ◽

Vol 46 (70) ◽

pp. 34727-34736

Author(s):

Shi-Lei Zhang ◽

Si-Jia Li ◽

Jia-Yun Wang ◽

He-Nan Shang ◽

Ya-Xuan Bai ◽

...

Keyword(s):

Carbon Nanotubes ◽

Formic Acid ◽

Functionalized Carbon Nanotubes ◽

Amine Functionalized ◽

Formic Acid Dehydrogenation

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New Composite Metal Foams under Compressive Cyclic Loadings

Materials Science Forum ◽

10.4028/www.scientific.net/msf.539-543.1868 ◽

2007 ◽

Vol 539-543 ◽

pp. 1868-1873 ◽

Cited By ~ 14

Author(s):

Afsaneh Rabiei ◽

Brian Neville ◽

Nick Reese ◽

Lakshmi Vendra

Keyword(s):

Maximum Stress ◽

Cell Structure ◽

Hollow Spheres ◽

Metal Foams ◽

Entire Sample ◽

Gravity Casting ◽

Cyclic Compression ◽

High Maximum ◽

Processing Techniques ◽

Very High

New composite metal foams are processed using powder metallurgy (PM) and gravity casting techniques. The foam is comprised of steel hollow spheres, with the interstitial spaces occupied by a solid metal matrix (Al or steel alloys). The cyclic compression loading of the products of both techniques has shown that the composite metal foams have high cyclic stability at very high maximum stress levels up to 68 MPa. Under cyclic loading, unlike other metal foams, the composite metal foams do not experience rapid strain accumulation within collapse bands and instead, a uniform distribution of deformation happen through the entire sample until the densification strain is reached. This is a result of more uniform cell structure in composite metal foams compared to other metal foams. As a result, the features controlling the fatigue life of the composite metal foams have been considered as sphere wall thickness and diameter, sphere and matrix materials, and processing techniques as well as bonding strength between the spheres and matrix.

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