scholarly journals Steady- and transient-state operation of a two-stage bioreactor for the treatment of a gaseous mixture of hydrogen sulphide, methanol and α-pinene

2010 ◽  
Vol 85 (3) ◽  
pp. 336-348 ◽  
Author(s):  
Eldon R. Rene ◽  
M. Estefania López ◽  
María C. Veiga ◽  
Christian Kennes
Keyword(s):  
Hydrogen Sulphide ◽  
Gaseous Mixture ◽  
Transient State ◽  
Two Stage

scholarly journals On the Formation of COS from H2S and CO2 in the Presence of Zeolite/Salt Compounds

1998 ◽  
Vol 16 (7) ◽  
pp. 577-581 ◽  
Author(s):  
Wolfgang Lutz ◽  
Andreas Seidel ◽  
Bruno Boddenberg
Keyword(s):  
Carbon Dioxide ◽  
Ion Exchange ◽  
Hydrogen Sulphide ◽  
Calcium Ions ◽  
Gaseous Mixture ◽  
Degree Of Conversion ◽  
Low Level ◽  
Sodium Cations

A gaseous mixture of hydrogen sulphide and carbon dioxide (20% H2S, 80% CO2) was brought into contact at 25°C with NaY and NaX zeolites in an as-synthesized form as well as after modification by the inclusion of salts (NaCl, NaBr) in the small cages of the aluminosilicate framework and ion exchange with aqueous CaCl2 solution. At small contact times (5 h), the degree of conversion of H2S according to the reaction H2S + CO2 → COS + H2O by the various samples was found to follow the sequence NaY/NaCl ≈ NaY/NaBr ≈ NaX/NaCl(CaCl2) < NaY « NaX/NaCl ≈ NaX. Long-term runs with NaY and NaY/NaBr revealed that the latter zeolite retained a very low level of H2S conversion for contact times as long as 250 h. It is concluded that such low H2S conversion requires the absence of low-coordinated sodium cations in the supercages or their replacement by calcium ions, and blocking of the β-cages with salt anions.

Resilient performance of an anoxic biotrickling filter for hydrogen sulphide removal from a biogas mimic: Steady, transient state and neural network evaluation

2020 ◽  
Vol 249 ◽  
pp. 119351 ◽  
Author(s):  
Wannapawn Watsuntorn ◽  
Ramita Khanongnuch ◽  
Warawut Chulalaksananukul ◽  
Eldon R. Rene ◽  
Piet N.L. Lens
Keyword(s):  
Neural Network ◽  
Hydrogen Sulphide ◽  
Transient State ◽  
Biotrickling Filter ◽  
Network Evaluation

Two-stage anaerobic digestion for reduced hydrogen sulphide production

2015 ◽  
Vol 91 (4) ◽  
pp. 1055-1062 ◽  
Author(s):  
Jan Moestedt ◽  
Erik Nordell ◽  
Sara Hallin ◽  
Anna Schnürer
Keyword(s):  
Anaerobic Digestion ◽  
Hydrogen Sulphide ◽  
Two Stage ◽  
Sulphide Production

Transient-state transport in some finite systems. Part I. A simple (two-stage) cascade

1983 ◽  
Vol 13 (2) ◽  
pp. 205-232 ◽  
Author(s):  
Richard Ash ◽  
Terence Foley
Keyword(s):  
Transient State ◽  
Two Stage ◽  
Finite Systems

scholarly journals Two‐stage gas‐phase bioreactor for the combined removal of hydrogen sulphide, methanol and α‐pinene

2009 ◽  
Vol 30 (12) ◽  
pp. 1261-1272 ◽  
Author(s):  
Eldon R. Rene ◽  
Yaomin Jin ◽  
María C. Veiga ◽  
Christian Kennes
Keyword(s):  
Gas Phase ◽  
Hydrogen Sulphide ◽  
Two Stage

Analyzing reactions of single mechanoenzyme molecules by light microscopy

1992 ◽  
Vol 50 (1) ◽  
pp. 426-427
Author(s):  
Jeff Gelles
Keyword(s):  
Image Processing ◽  
Reaction Mechanisms ◽  
Transient State ◽  
Nanometer Scale ◽  
Reaction Intermediates ◽  
Enzyme Molecule ◽  
Directed Movement ◽  
Enzyme Molecules ◽  
Individual Enzyme ◽  
Single Reaction

Mechanoenzymes are enzymes which use a chemical reaction to power directed movement along biological polymer. Such enzymes include the cytoskeletal motors (e.g., myosins, dyneins, and kinesins) as well as nucleic acid polymerases and helicases. A single catalytic turnover of a mechanoenzyme moves the enzyme molecule along the polymer a distance on the order of 10−9 m We have developed light microscope and digital image processing methods to detect and measure nanometer-scale motions driven by single mechanoenzyme molecules. These techniques enable one to monitor the occurrence of single reaction steps and to measure the lifetimes of reaction intermediates in individual enzyme molecules. This information can be used to elucidate reaction mechanisms and determine microscopic rate constants. Such an approach circumvents difficulties encountered in the use of traditional transient-state kinetics techniques to examine mechanoenzyme reaction mechanisms.

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