A Novel Method to Correlate Layer Charge and the Catalytic Activity of 2:1 Dioctahedral Smectite Clays in Terms of Binding the Interlayer Cation Surrounded by Monohydrate

2000 ◽  
Vol 104 (35) ◽  
pp. 8216-8223 ◽  
Author(s):  
Abhijit Chatterjee ◽  
Takashi Iwasaki ◽  
Takeo Ebina
Keyword(s):  
Catalytic Activity ◽  
Layer Charge ◽  
Interlayer Cation ◽  
Smectite Clays ◽  
Dioctahedral Smectite ◽  
Novel Method

Effect of interlayer cation and relative humidity on the hydration properties of a dioctahedral smectite

2007 ◽  
Vol 2007 (suppl_26) ◽  
pp. 417-422 ◽  
Author(s):  
W. Oueslati ◽  
M. S. Karmous ◽  
H. Ben Rhaiem ◽  
B. Lanson ◽  
A. Ben Haj Amara
Keyword(s):  
Relative Humidity ◽  
Interlayer Cation ◽  
Hydration Properties ◽  
Dioctahedral Smectite

Influence of pH, layer charge location and crystal thickness distribution on U(VI) sorption onto heterogeneous dioctahedral smectite

2016 ◽  
Vol 317 ◽  
pp. 246-258 ◽  
Author(s):  
Vanessa Guimarães ◽  
Enrique Rodríguez-Castellón ◽  
Manuel Algarra ◽  
Fernando Rocha ◽  
Iuliu Bobos
Keyword(s):  
Thickness Distribution ◽  
Layer Charge ◽  
Crystal Thickness ◽  
Dioctahedral Smectite ◽  
Influence Of Ph

The Potential Use of Liquid Oxidizer in PEM Cells

2006 ◽  
Author(s):  
Paul Erickson ◽  
David Grupp
Keyword(s):  
Heat Transfer ◽  
Experimental Data ◽  
Catalytic Activity ◽  
Fuel Cell ◽  
Liquid Phase ◽  
Concentration Polarization ◽  
Pem Fuel Cell ◽  
Cell Systems ◽  
Novel Method ◽  
Potential Use

A novel method of using a liquid phase oxidizer in fuel cell applications has been discovered by researchers at UC Davis. This paper outlines potential implications for improving heat transfer and catalytic activity with this method. Experimental data have been collected and the results show that the proposed method of using liquid phase oxidizer does indeed allow operation of PEM fuel cell systems. Data indicate an improvement in overvoltage at low current but also clearly indicate a severely limited concentration polarization region with non-regenerated fluid. The preliminary data indicate the physical feasibility of the method but also show that more research and development is required.

Effect of interlayer cation and relative humidity on the hydration properties of a dioctahedral smectite

2007 ◽  
Vol 2007 (suppl_26) ◽  
pp. 417-422 ◽  
Author(s):  
W. Oueslati ◽  
M. S. Karmous ◽  
H. Ben Rhaiem ◽  
B. Lanson ◽  
A. Ben Haj Amara
Keyword(s):  
Relative Humidity ◽  
Interlayer Cation ◽  
Hydration Properties ◽  
Dioctahedral Smectite

The influence of exchangeable aluminium ion concentration and of layer charge on the catalytic activity of montmorillonite clays

1989 ◽  
Vol 2 (3) ◽  
pp. 125-128 ◽  
Author(s):  
J. H. Purnell ◽  
J. M. Thomas ◽  
P. Diddams ◽  
J. A. Ballantine ◽  
W. Jones
Keyword(s):  
Catalytic Activity ◽  
Ion Concentration ◽  
Layer Charge ◽  
Aluminium Ion ◽  
Montmorillonite Clays

scholarly journals Interaction of montmorillonite with phenothiazine dyes and pyronin in aqueous dispersions: A visible spectroscopy study

2009 ◽  
Vol 7 (3) ◽  
pp. 343-353 ◽  
Author(s):  
Adriana Czímerová ◽  
Alexander Čeklovský ◽  
Juraj Bujdák
Keyword(s):  
Organic Dyes ◽  
Point Of View ◽  
Molecular Structures ◽  
Layer Charge ◽  
Molecular Sensors ◽  
Phenothiazine Dyes ◽  
Novel Method ◽  
J Aggregates ◽  
The Individual

AbstractLayer charge is one of the key parameters used for the characterisation of expandable clay minerals, smectites. It determines most significant properties of the material which are important from the industrial application point of view. This work is related to a novel method introduced to characterize the layer charge of smectites, based on using cationic organic dyes as molecular sensors. One xanthene and four phenothiazine cationic dyes were tested using reduced charge montmorillonites (RCMs) and compared with methylene blue, which has been used most frequently. The characterization of the charge was based on the formation of molecular assemblies (H- and J-aggregates) composed by dye cations, which were easily detectable using absorption spectroscopy in the UV/VIS spectrum. More detailed characterization of the spectra required calculations of second-derivative curves. For all of the reaction systems tested in this work, the molecular aggregation increased with the layer charge of RCMs. Slight to moderate differences in the formation of dye assemblies related to the differences in the molecular structures of the individual dye cations. For example, the molecular asymmetry of azure A brought about the formation of coexistent species of similar structures. The structure of the heteroaromatic skeleton affected the extent of the aggregation and spectral changes with time. The presence of reactive, non-substituted amino groups in thionine cations probably partially decomposed in the clay mineral colloids based on high-charge RCMs. Any of the tested dyes could be used as molecular sensors for empirical characterization of the layer charge of clays taking into account the differences mentioned above.

scholarly journals Huge enhanced activity of the alditol oxidase by a novel method based on the mechanically interlocked dimmer synthesized in vivo

2021 ◽  
Author(s):  
Wencai Zhang ◽  
Mianxing Luo ◽  
Meng Zhang ◽  
Guo Chen ◽  
Hongwei Guo ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Kinetic Analysis ◽  
Catalytic Efficiency ◽  
Dramatic Improvement ◽  
Mechanical Interlocking ◽  
Wild Type ◽  
Protein Properties ◽  
Novel Method ◽  
Activity Enhancement

Topology engineering is an attractive approach for tailoring protein properties without varying their native sequences. To explore whether concatenation allow, Herein, we report a dramatic improvement of catalytic efficiencies of alditol oxidase by catenanes assisted by synergy between mechanically interlocking p53dim and highly efficient SpyTag/SpyCathcher cyclization. Mechanical interlocking leads to considerable activity enhancement than that achieved by point mutation. Kinetic analysis demonstrates that the substrates affinity and catalytic efficiency of alditol oxdiase catenanes(catAldO) towards glycerol respectively have 6.7-fold and 5.5-fold improvement compared with the wild-type AldO. We envisioned that mechanically interlocked alditol oxidase may shorten the transfer distance of electrons between subdormains and accelerate FAD cofactor redox regeneration, thus improving enzyme catalytic activity. Surprisingly, concatenation of alditol oxidase not only increase the catalytic efficiency towards glycerol, but also exhibit a broad biocatalytic reinforcement. Mechanical interlocking provides a convenient and efficient approach for multi-domains enzyme concatenation, with potential to greatly enhance the catalytic efficiency of biocatalysts. It needs more verification in other enzymes.

Controllable Synthesis of Enhanced Visible Light Responded Fe, N, Co Tri-TiO2@MCM-41 Nanocomposites and Its Photocatalytic Performance

2021 ◽  
Vol 21 (10) ◽  
pp. 5107-5119
Author(s):  
Yanhui Niu ◽  
Guanyu Liu ◽  
Huiyun Xia ◽  
Xu Zhao ◽  
Gengtong Zhang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Reaction Chamber ◽  
Tetrabutyl Titanate ◽  
Optimal Parameters ◽  
Composite Photocatalyst ◽  
Alcohol Water ◽  
Ft Ir ◽  
Novel Method ◽  
Mcm 41

A novel method for in situ synthesis of Fe, N, Co tri-TiO2 (DT) loading on MCM-41 composite photocatalyst was proposed. Fe, N, Co tri-TiO2@MCM-41 (DTM) with adsorption-degradation synergy was prepared by adjusting tetrabutyl titanate (TBOT) concentrations, the alcohol-water ratio in the atmosphere of the reaction chamber. The influence of preparation parameters on the texture structure, catalytic activity, and the synergism of adsorption and degradation of the DTM was discussed, the optimal parameters were determined. The DTM was characterized by XRD, TEM, BET, FT-IR, and UV-Vis. Besides, the DTM exhibited obvious redshift and visible catalytic activity compared with undoped TiO2@MCM-41 (TM), which possessed excellent performance in the degradation of gaseous and liquid pollutants. The degradation rate of methylene blue (MB) and nitric oxide (NO) was 96.39% and 56.75%, respectively. Furthermore, DTM photocatalyst exhibited excellent reusability. The degradation efficiency of MB and NO after five cycles decreased by 4.54% and 5.89%, respectively.

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