Effect of CaSO4pelletisation conditions on pellet strength and reactivity for converting SO2to elemental sulphur by reaction cycles involving CaSO4/CaS

2008 ◽  
Vol 117 (2) ◽  
pp. 100-107 ◽  
Author(s):  
M. E. Choi ◽  
H. Y. Sohn ◽  
Y. M. Z. Ahmed ◽  
F. M. Mohamed ◽  
G. Han ◽  
...  
Keyword(s):  
Elemental Sulphur ◽  
Pellet Strength ◽  
Reaction Cycles

Re-Programming Hydrogel Properties using a Fuel-driven Reaction Cycle

2019 ◽  
Author(s):  
Nishant Singh ◽  
Bruno Lainer ◽  
Georges Formon ◽  
Serena De Piccoli ◽  
Thomas Hermans
Keyword(s):  
Methionine Oxidation ◽  
Guanosine Triphosphate ◽  
Control Reaction ◽  
Reaction Cycle ◽  
Materials Properties ◽  
Assembly Kinetics ◽  
Control Assembly ◽  
Indispensable Tool ◽  
Reaction Cycles ◽  
Non Equilibrium

Nature uses catalysis as an indispensable tool to control assembly and reaction cycles in vital non-equilibrium supramolecular processes. For instance, enzymatic methionine oxidation regulates actin (dis)assembly, and catalytic guanosine triphosphate hydrolysis is found in tubulin (dis)assembly. Here we present a completely artificial reaction cycle which is driven by a chemical fuel that is catalytically obtained from a ‘pre-fuel’. The reaction cycle controls the disassembly and re-assembly of a hydrogel, where the rate of pre-fuel turnover dictates the morphology as well as the mechanical properties. By adding additional fresh aliquots of fuel and removing waste, the hydrogels can be re-programmed time after time. Overall, we show how catalysis can control fuel generation to control reaction / assembly kinetics and materials properties in life-like non-equilibrium systems.

Sewage sludge as a precursor of adsorbents/catalysts for environmental applications

2007 ◽  
Vol 2 (1) ◽  
Author(s):  
A. Ros ◽  
C. Canals-Batlle ◽  
M.A. Lillo-Ródenas ◽  
E. Fuente ◽  
M. A. Montes-Morán ◽  
...  
Keyword(s):  
Sewage Sludge ◽  
Room Temperature ◽  
Waste Water Treatment ◽  
Textural Properties ◽  
Active Species ◽  
Elemental Sulphur ◽  
Gaseous Emissions ◽  
Removal Experiments ◽  
Catalytically Active

This paper focuses on the valorisation of solid residues obtained from the thermal treatment of sewage sludge. In particular, sewage sludge samples were collected from two waste water treatment plants (WWTPs) with different sludge line basic operations. After drying, sludges were heated up to 700 °C in appropriate ovens under diluted air (gasification) and inert (pyrolysis) atmospheres. The solids obtained, as well as the dried (raw) sludges, were characterised to determine their textural properties and chemical composition, including the speciation of their inorganic fraction. All the materials under study were employed as adsorbents/catalysts in H2S removal experiments at room temperature. It was found that, depending on the particular sludge characteristics, outstanding results can be achieved both in terms of retention capacities and selectivity. Some of the solids outperform commercially available sorbents specially designed for gaseous emissions control. In these adsorbents/catalysts, H2S is selectively oxidised to elemental sulphur most likely due to the presence of inorganic, catalytically active species. The role of the carbon-enriched part on these solids is also remarked.

Pyrolysis of unsubstituted bicyclic hydrocarbons and gas oil

1982 ◽  
Vol 47 (7) ◽  
pp. 1838-1847 ◽  
Author(s):  
Martin Bajus ◽  
Jozef Baxa
Keyword(s):  
Stainless Steel ◽  
Elemental Sulphur ◽  
Raw Material ◽  
Gas Oil ◽  
Mass Ratio ◽  
Reaction Products ◽  
Pyrolysis Products ◽  
Reactor Material ◽  
Tubular Reactors ◽  
Stainless Steel Reactor

Pyrolysis of tetraline, decaline, 1,1'-bicyclohexane, cyclohexylbenzene and gas oil was studied in stainless steel and quartz flow tubular reactors at 780 and 800 °C, residence time 0.08 to 0.5 s and at the mass ratio of steam to the raw material changing from 0.5 to 1.5. The effect of reaction temperature, the mass ratio of steam to the raw material, reactor material and of the added elemental sulphur on the yields of individual reaction products is reported. Of bicyclic hydrocarbons, condensed hydrocarbons are more stable than those with noncondensed rings, cyclanoaromates being more stable than bicyclanes. Pyrolysis of gas oil in the stainless steel reactor yields greater amounts of ethylene, propylene, butadiene and smaller amounts of methane and ethane, compared to the pyrolysis carried out under identical conditions in the quartz reactor. Elemental sulphur increases the conversion of gas oil into gaseous pyrolysis products.

scholarly journals Parasitic Behavior in Competing Chemically Fueled Reaction Cycles

2021 ◽  
Author(s):  
Patrick S. Schwarz ◽  
Sudarshana Laha ◽  
Jacqueline Janssen ◽  
Tabea Huss ◽  
Job Boekhoven ◽  
...  
Keyword(s):  
Dynamic Behavior ◽  
Model Systems ◽  
Reaction Networks ◽  
Reaction Cycles ◽  
Non Equilibrium

Non-equilibrium, fuel-driven reaction cycles serve as model systems of the intricate reaction networks of life. Rich and dynamic behavior is observed when reaction cycles regulate assembly processes, such as phase...

scholarly journals Rhodathiaborane reaction cycles driven by C2H4 and H2: synthesis and characterization of [(H)2(PPh3)RhSB8H7(PPh3)] and [(η2-C2H4)(PPh3)RhSB8H7(PPh3)]

2015 ◽  
Vol 44 (11) ◽  
pp. 5041-5044 ◽  
Author(s):  
Susana Luaces ◽  
Ramón Macías ◽  
María José Artigas ◽  
Fernando J. Lahoz ◽  
Luis A. Oro
Keyword(s):  
Reversible Reaction ◽  
Synthesis And Characterization ◽  
Reaction Cycles

New 10-vertex rhodathiaboranes are reported to exhibit reversible reaction chemistry leading to the formation of stoichiometric cycles driven by the hydrogenation of the alkene ligand.

Effect of Minor Additives on First Stage Graphitisation in White Cast Iron

1984 ◽  
Vol 34 ◽  
Author(s):  
P. L. Roy ◽  
A. K. Chakrabart ◽  
P. Banerjee
Keyword(s):  
Mechanical Properties ◽  
Cast Iron ◽  
Sodium Chloride ◽  
Yield Strength ◽  
White Cast Iron ◽  
Elemental Sulphur ◽  
Optimum Dose ◽  
White Iron ◽  
Kinetics Of ◽  
Strength And Ductility

ABSTRACTMinor additions (0.05-0.2 wt.%) of sodium chloride, hexachloroethane and elemental sulphur to commercial white iron melts have been found to enhance the kinetics of first stage graphitisation during subsequent annealing of white iron samples. The optimum dose of sodium chloride and hexachloroethane addition is around 0.1%. Yield strength and ductility of annealed test bars treated with NaCl or C2Cl6 compare favourably with those of untreated test bars. Sulphur treatment causes slight deterioration in mechanical properties. Fully grown nodules in both treated and untreated samples appear porous under SEM. Possible mechanisms of acceleration of graphitisation in the treated samples have been suggested.

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