Low-Temperature Reductive Aminolysis of Carbohydrates to Diamines and Aminoalcohols by Heterogeneous Catalysis

2017 ◽  
Vol 56 (46) ◽  
pp. 14540-14544 ◽  
Author(s):  
Michiel Pelckmans ◽  
Walter Vermandel ◽  
Frederik Van Waes ◽  
Kristof Moonen ◽  
Bert F. Sels
Keyword(s):  
Heterogeneous Catalysis ◽  
Low Temperature

Low-Temperature Reductive Aminolysis of Carbohydrates to Diamines and Aminoalcohols by Heterogeneous Catalysis

2017 ◽  
Vol 129 (46) ◽  
pp. 14732-14736 ◽  
Author(s):  
Michiel Pelckmans ◽  
Walter Vermandel ◽  
Frederik Van Waes ◽  
Kristof Moonen ◽  
Bert F. Sels
Keyword(s):  
Heterogeneous Catalysis ◽  
Low Temperature

scholarly journals Key factor for the anti-Arrhenius low-temperature heterogeneous catalysis induced by H+ migration: H+ coverage over support

2020 ◽  
Vol 56 (23) ◽  
pp. 3365-3368 ◽  
Author(s):  
Kota Murakami ◽  
Yuta Tanaka ◽  
Ryuya Sakai ◽  
Yudai Hisai ◽  
Sasuga Hayashi ◽  
...  
Keyword(s):  
Heterogeneous Catalysis ◽  
Low Temperature ◽  
Electric Field ◽  
Catalytic Reaction ◽  
Small Scale ◽  
Heterogeneous Catalytic Reaction ◽  
Heterogeneous Catalytic ◽  
On Demand ◽  
Novel Approach ◽  
Key Factor

Low-temperature heterogeneous catalytic reaction in an electric field is anticipated as a novel approach for on-demand and small-scale catalytic processes.

CATALYTIC REQUIREMENTS FOR MIXED REACTANT FUEL CELLS

2008 ◽  
Vol 01 (02) ◽  
pp. 105-113 ◽  
Author(s):  
ILAN RIESS
Keyword(s):  
Fuel Cells ◽  
High Temperature ◽  
Fuel Cell ◽  
Heterogeneous Catalysis ◽  
Low Temperature ◽  
Electrode Materials ◽  
Catalytic Properties ◽  
Electrochemical Reactions ◽  
Direct Reaction ◽  
Oxygen Ions

Significant advantage could be achieved if mixed reactant fuel cells, MR-FC, were functioning. These cells are intended to operate on a mixture of air and fuel introduced into both the cathode and anode compartment. Symmetry is broken by using different electrode materials exhibiting special and different catalytic properties. No high temperature fuel cell was reported to date to function as a true MR-FC and only one, low temperature type, did function properly. We discuss the required catalytic properties which are unique in that they promote electrochemical reactions and suppress chemical ones as well as possible ways to search for them. The chemical reaction which has to be suppressed is the direct reaction of fuel and oxygen as the two components are premixed and the mixture is then introduced into the fuel cell at both electrode compartments. The electrochemical reactions that should be promoted are the reduction of oxygen at the cathode and the oxidation of fuel at the anode only by oxygen ions that emerge from the solid electrolyte. Conditions to promote this selectivity are discussed. These are derived from the theory of chemisorption as applied to heterogeneous catalysis.

scholarly journals Phase controlled synthesis of bifunctional TiO2 nanocrystallites viad-mannitol for dye-sensitized solar cells and heterogeneous catalysis

RSC Advances ◽  
2020 ◽  
Vol 10 (25) ◽  
pp. 14826-14836
Author(s):  
Abdullah M. Al-Enizi ◽  
T. A. J. Siddiqui ◽  
Shoyebmohamad F. Shaikh ◽  
Mohd Ubaidullah ◽  
Ayman Yousef ◽  
...  
Keyword(s):  
Solar Cells ◽  
Heterogeneous Catalysis ◽  
Low Temperature ◽  
Hydrothermal Process ◽  
Dye Sensitized Solar Cells ◽  
Controlled Synthesis ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

The crystal architecture of TiO2 was successfully tailored via a low-temperature (≤200 °C) hydrothermal process in the presence of d-mannitol for feasible applications in dye-sensitized solar cells (DSSCs) and heterogeneous catalysis.

scholarly journals Heterogeneous catalysis for sustainable biodiesel productionviaesterification and transesterification

2014 ◽  
Vol 43 (22) ◽  
pp. 7887-7916 ◽  
Author(s):  
Adam F. Lee ◽  
James A. Bennett ◽  
Jinesh C. Manayil ◽  
Karen Wilson
Keyword(s):  
Fatty Acids ◽  
Heterogeneous Catalysis ◽  
Low Temperature ◽  
Energy Efficient ◽  
Catalytic Conversion ◽  
Sustainable Production ◽  
Enabling Technology ◽  
Renewable Feedstocks

Low temperature catalytic conversion of triglycerides and fatty acids sourced from renewable feedstocks represents a key enabling technology for the sustainable production of biodiesel through energy efficient, intensified processes.

Exsolution and inversion in pigeonite from the Whin Sill, Northern England

1978 ◽  
Vol 36 (1) ◽  
pp. 474-475
Author(s):  
P.P.K. Smith
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Homogeneous Nucleation ◽  
Silicate Mineral ◽  
Antiphase Boundaries ◽  
Two Phase ◽  
Primitive Form ◽  
The Core ◽  
Nucleation Mechanisms ◽  
And Inversion

Grains of pigeonite, a calcium-poor silicate mineral of the pyroxene group, from the Whin Sill dolerite have been ion-thinned and examined by TEM. The pigeonite is strongly zoned chemically from the composition Wo8En64FS28 in the core to Wo13En34FS53 at the rim. Two phase transformations have occurred during the cooling of this pigeonite:- exsolution of augite, a more calcic pyroxene, and inversion of the pigeonite from the high- temperature C face-centred form to the low-temperature primitive form, with the formation of antiphase boundaries (APB's). Different sequences of these exsolution and inversion reactions, together with different nucleation mechanisms of the augite, have created three distinct microstructures depending on the position in the grain.In the core of the grains small platelets of augite about 0.02μm thick have farmed parallel to the (001) plane (Fig. 1). These are thought to have exsolved by homogeneous nucleation. Subsequently the inversion of the pigeonite has led to the creation of APB's.

Low temperature x-ray microanalysis of frozen-hydrated tobacco leaves

1984 ◽  
Vol 42 ◽  
pp. 284-285
Author(s):  
S. Edith Taylor ◽  
Patrick Echlin ◽  
May McKoon ◽  
Thomas L. Hayes
Keyword(s):  
Low Temperature ◽  
Lemna Minor ◽  
Root Tips ◽  
Tobacco Leaves ◽  
X Ray ◽  
Whole Cells ◽  
Carbon Coated ◽  
The Right ◽  
Beam Currents ◽  
The University

Low temperature x-ray microanalysis (LTXM) of solid biological materials has been documented for Lemna minor L. root tips. This discussion will be limited to a demonstration of LTXM for measuring relative elemental distributions of P,S,Cl and K species within whole cells of tobacco leaves.Mature Wisconsin-38 tobacco was grown in the greenhouse at the University of California, Berkeley and picked daily from the mid-stalk position (leaf #9). The tissue was excised from the right of the mid rib and rapidly frozen in liquid nitrogen slush. It was then placed into an Amray biochamber and maintained at 103K. Fracture faces of the tissue were prepared and carbon-coated in the biochamber. The prepared sample was transferred from the biochamber to the Amray 1000A SEM equipped with a cold stage to maintain low temperatures at 103K. Analyses were performed using a tungsten source with accelerating voltages of 17.5 to 20 KV and beam currents from 1-2nA.

Bulk standards for low-temperature biological x-ray microanalysis

1984 ◽  
Vol 42 ◽  
pp. 282-283
Author(s):  
P. Echlin ◽  
M. McKoon ◽  
E.S. Taylor ◽  
C.E. Thomas ◽  
K.L. Maloney ◽  
...  
Keyword(s):  
Phase Separation ◽  
Low Temperature ◽  
Analytical Method ◽  
Salt Solutions ◽  
Absolute Concentration ◽  
Cooling Process ◽  
X Ray ◽  
The Absolute ◽  
Analytical Procedures ◽  
Electrical Conductors

Although sections of frozen salt solutions have been used as standards for x-ray microanalysis, such solutions are less useful when analysed in the bulk form. They are poor thermal and electrical conductors and severe phase separation occurs during the cooling process. Following a suggestion by Whitecross et al we have made up a series of salt solutions containing a small amount of graphite to improve the sample conductivity. In addition, we have incorporated a polymer to ensure the formation of microcrystalline ice and a consequent homogenity of salt dispersion within the frozen matrix. The mixtures have been used to standardize the analytical procedures applied to frozen hydrated bulk specimens based on the peak/background analytical method and to measure the absolute concentration of elements in developing roots.

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