1,746,248 research outputs found
Kraken support phone number (808)-800-9345
No full textKraken Phone (808)-800-9345 NuMbEr M22 Kraken Support Number (808)-800-9345 Kraken Toll Free Number | Customer Support (808)-800-9345 Kraken Phone Number || Toll Free || Customer Support Phone Number || Help Desk || Help Care | Customer Care Number | I recently found some excellent command line switches to improve the Kraken.COM operation and to add extra functionality to your everyday use of ICLOUD. A command line switch is a an extra command added to the end of the application executable. For the less nerdy readers, to open an application you icon, this is linked to a application file called an executable, example. This will open the Kraken .COM to your deskto
Gemini support phone number (808)-800-9345
No full textGemini Phone (808)-800-9345 NuMbEr M22 Gemini Support Number (808)-800-9345 Gemini Toll Free Number | Customer Support (808)-800-9345 Gemini Phone Number || Toll Free || Customer Support Phone Number || Help Desk || Help Care | Customer Care Number | I recently found some excellent command line switches to improve the Gemini.COM operation and to add extra functionality to your everyday use of ICLOUD. A command line switch is a an extra command added to the end of the application executable. For the less nerdy readers, to open an application you icon, this is linked to a application file called an executable, example. This will open the Gemini .COM to your deskto
Kucoin support (808)-800-9345 Kucoin support
No full textKucoin Phone (808)-800-9345 NuMbEr M22 Kucoin Support Number (808)-800-9345 Kucoin Toll Free Number | Customer Support (808)-800-9345 Kucoin Phone Number || Toll Free || Customer Support Phone Number || Help Desk || Help Care | Customer Care Number | I recently found some excellent command line switches to improve the Kucoin.COM operation and to add extra functionality to your everyday use of ICLOUD. A command line switch is a an extra command added to the end of the application executable. For the less nerdy readers, to open an application you icon, this is linked to a application file called an executable, example. This will open the Kucoin .COM to your deskto
Kucoin Support Number (808)-800-9345 toll free usa
No full textKucoin Phone (808)-800-9345 NuMbEr M22 Kucoin Support Number (808)-800-9345 Kucoin Toll Free Number | Customer Support (808)-800-9345 Kucoin Phone Number || Toll Free || Customer Support Phone Number || Help Desk || Help Care | Customer Care Number | I recently found some excellent command line switches to improve the Kucoin.COM operation and to add extra functionality to your everyday use of ICLOUD. A command line switch is a an extra command added to the end of the application executable. For the less nerdy readers, to open an application you icon, this is linked to a application file called an executable, example. This will open the Kucoin .COM to your deskto
In-situ stress conditions at ODP Site 131-808
No full textShipboard laboratory index property data, shore-based consolidation tests, and in-situ stress and pore-pressure measurements are used in this study to constrain the stress conditions at ODP Site 808, Nankai Trough. Results of these tests are presented along with additional interpretations of porosity rebound and permeability. The sediment at Site 808 is highly affected by excess fluid
pressures throughout the sediment column. Excess fluid pressure is severe below the major fault boundary, the décollement. The in-situ measurement of lateral stresses, which are shallow in the sediment section, confirms that the principal stress direction is rotated from a "normal" basin-type condition where the principal stress direction is vertical
High Proton Conductivity Achieved by Encapsulation of Imidazole Molecules into Proton-Conducting MOF-808
No full textMetal–organic
frameworks (MOFs), as newly emerging materials,
show compelling intrinsic structural features, e.g., the highly crystalline
nature and designable and tunable porosity, as well as tailorable
functionality, rendering them suitable for proton-conducting materials.
The proton conduction of MOF is significantly improved using the postsynthesis
or encapsulation strategy. In this work, the MOF-based proton-conducting
material Im@MOF-808 has been prepared by incorporating the imidazole
molecules into the pores of proton-conducting MOF-808. Compared with
MOF-808, Im@MOF-808 not only possesses higher proton conductivity
of 3.45 × 10–2 S cm–1 at
338 K and 99% RH, superior to that of any imidazole-encapsulated proton-conducting
materials reported to date, but also good durable and stable proton
conduction. Moreover, the thermal stability of H-bond networks is
much improved owing to the water molecules partially replaced by higher
boiling point imidazole molecules. Additionally, it is further discussed
for the possible mechanism of imidazole encapsulation into the pores
of MOF-808 to enhance proton conduction
Theoretical Study on the Catalytic CO<sub>2</sub> Hydrogenation over the MOF-808-Encapsulated Single-Atom Metal Catalysts
No full textThe search for new catalytic agents for reducing excess
CO2 in the atmosphere is a challenging but essential task.
Due
to the well-defined porous structures and unique physicochemical properties,
metal–organic frameworks (MOFs) have been regarded as one of
the promising materials in the catalytic conversion of CO2 into valuable platform chemicals. In particular, introducing the
second metal (M) atom to form the MII–O–Zr4+ single-atom metal sites on the Zr nodes of MOF-808 would
further greatly improve the catalytic performance. Herein, CO2 hydrogenation reaction mechanisms and kinetics over a series
of MOF-808-encapsulated single-atom metal catalysts, i.e., MII–MOF-808 (MII = CuII, FeII, PtII, NiII, and PdII), were systematically
studied using density functional theory calculations. First, it has
been found that the stability for the encapsulation of a divalent
metal ion follows the trend of PtII > NiII >
PdII > CuII > FeII, while they
all
possess moderate anchoring stability on the MOF-808 with the Gibbs
replacement energies ranging from −233.7 to −310.3 kcal/mol.
Two plausible CO2 hydrogenation pathways on CuII–MOF-808 catalysts, i.e., formate and carboxyl routes, were
studied. The formate route is more favorable, in which the H2COOH*-to-H2CO* step is kinetically the most relevant step
over CuII–MOF-808. Using the energetic span model,
the relative turnover frequencies of CO2 hydrogenation
to various C1 products over MII–MOF-808 were calculated.
The CuII–MOF-808 catalyst is found to be the most
active catalyst among five MII–MOF-808 catalysts
Non-Noble Metal-Doped MOF-808-Zr Nanostructures with Abundant Defects for Toluene Oxidation
No full textDefect creation in metal–organic frameworks (MOFs)
is a
promising approach to optimize the performance of MOFs for a wide
range of potential applications. Because of its excellent stability,
large surface area, and pore size, MOF-808 (Zr), an essential member
of the family of MOFs, has received increasing attention. Consequently,
the development of defective MOF-808-Zr has become a hot topic of
research. Here, we synthesized and investigated the oxidative catalytic
characteristics of nonprecious metal-doped MOF-808-Zr nanoparticles.
X-ray diffraction was combined with analytical and spectroscopic techniques
to investigate the characteristics of the MOF material (MOF-808-ZrM,
where M = Mn, V, Ce, and Ti). Toluene oxidation in the presence of
oxygen was used as a model reaction to investigate its catalytic capabilities.
Various tests, including in situ DRIFT, confirmed that the incorporation
of exotic metals into MOF-808-Zr nanoparticles increased surface oxygen
vacancies and surface imperfections, thereby enhancing the catalytic
activity. This article proposes a method to improve the performance
of toluene-oxidizing catalysts by doping 808-MOFs with transition
metals
Selective Hydrogenolysis of 5‑Hydroxymethylfurfural into 2,5-Dimethylfuran under Mild Conditions Using Pd/MOF-808
No full text2,5-Dimethylfuran (DMF) is an important candidate for
liquid fuels,
which can be produced from biomass-derived 5-hydroxymethylfurfural
(5-HMF). Efficient catalysts for selective hydrogenolysis of HMF to
DMF under mild conditions without any additives are highly desired.
Herein, we designed and prepared a Zr-based metal–organic framework
(MOF-808) supported Pd catalyst (Pd/MOF-808), which can efficiently
catalyze the hydrogenolysis of HMF to DMF with a yield of 99% under
100 °C without any additives. In addition, the Pd/MOF-808 catalyst
also showed good reusability, with the capability of being used five
times without loss of activity
Effective Degradation of Novichok Nerve Agents by the Zirconium MetalOrganic Framework MOF-808
No full textNovichoks
are a novel class of nerve agents (also referred to as
the A-series) that were employed in several poisonings over the last
few years. This calls for the development of novel countermeasures
that can be applied in protective concepts (e.g., protective clothing)
or in decontamination methods. The Zr metal–organic framework
MOF-808 has recently emerged as a promising catalyst in the hydrolysis
of the V- and G-series of nerve agents as well as their simulants.
In this paper, we report a detailed study of the degradation of three
Novichok agents by MOF-808 in buffers with varying pH. MOF-808 is
revealed to be a highly efficient and regenerable catalyst for Novichok
agent hydrolysis under basic conditions. In contrast to the V- and
G-series of agents, degradation of Novichoks is demonstrated to proceed
in two consecutive hydrolysis steps. Initial extremely rapid P–F
bond breaking is followed by MOF-catalyzed removal of the amidine
group from the intermediate product. The intermediate thus acted as
a competitive substrate that was rate-determining for the whole two-step
degradation route. Under acidic conditions, the amidine group in Novichok A-230 is more rapidly hydrolyzed than the P–F bond,
giving rise to another moderately toxic intermediate. This intermediate
could in turn be efficiently hydrolyzed by MOF-808 under basic conditions.
These experimental observations were corroborated by density functional
theory calculations to shed light on molecular mechanisms
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