Study of the Influence of Water on Oxidative Properties of Fe3+ in ZSM-5 Zeolite Channels

2002 ◽  
Vol 67 (12) ◽  
pp. 1743-1759 ◽  
Author(s):  
Gabriel Čík ◽  
Milada Hubinová ◽  
František Šeršeň ◽  
Vlasta Brezová
Keyword(s):  
Ion Exchange ◽  
Room Temperature ◽  
Cation Radical ◽  
Organic Substrates ◽  
Cation Radicals ◽  
Influence Of Water

The interactions of phenol and thiophene with Fe3+ ions have been studied in ZSM-5 zeolite channels in the presence of water. The Fe-ZSM-5 was prepared by the ion exchange of Fe3+ for Na+. The Fe3+ ions in zeolite channels have unsaturated co-ordination spheres and oxidize organic substrates (phenol, thiophene) at room temperature. The interaction of Fe3+ with phenol gives rise to the stabilized cation-radical PhOH•+ and thiophene forms low oligomers (2-6 monomeric units). The oligomers are present in the neutral as well as oxidized form as cation-radicals (polarons). The formation of dications (bipolarons) has not been observed.

Electron transport via metalloporphyrins

1978 ◽  
Vol 56 (10) ◽  
pp. 1381-1388 ◽  
Author(s):  
Eugene C. Johnson ◽  
Tony Niem ◽  
David Doolphin
Keyword(s):  
Electron Transfer ◽  
Electron Transport ◽  
Heme Proteins ◽  
Room Temperature ◽  
Cation Radical ◽  
Cation Radicals ◽  
Controlled Potential Electrolysis ◽  
Controlled Potential ◽  
Internal Electron

The controlled potential electrolysis of Ni(II) meso-tetraphenylporphyrin (Ni(II)TPP) gives at room temperature the corresponding metalloporphyrin π-cation radical [Ni(II)TPP]+ •. Upon freezing a solution of the π-cation radical to 77 K an internal electron transfer occurs to give [Ni(III)TPP]+. A discussion of the routes of electron transport in heme proteins is given, and the roles of metalloporphyrin π-cation radicals in electron transport is evaluated.

A facile room temperature chemical transformation approach for binder-free thin film formation of Ag2Te and lithiation/delithiation chemistry of the film

2016 ◽  
Vol 45 (43) ◽  
pp. 17312-17318 ◽  
Author(s):  
Eun-Kyung Kim ◽  
Dasom Park ◽  
Nabeen K. Shrestha ◽  
Jinho Chang ◽  
Cheol-Woo Yi ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Aqueous Solution ◽  
Ion Exchange ◽  
Chemical Transformation ◽  
Room Temperature ◽  
Film Formation ◽  
Synthetic Method ◽  
Binder Free ◽  
Thin Film Formation

An aqueous solution based synthetic method for binder-free Ag2Te thin films using ion exchange induced chemical transformation of Ag/AgxO thin films.

Influence of Water Treatment of LaF3Crystal on LaF3-Based Oxygen Sensor Workable at Room Temperature

1991 ◽  
Vol 30 (Part 2, No. 7B) ◽  
pp. L1327-L1329 ◽  
Author(s):  
Jerzy P. Lukaszewicz ◽  
Norio Miura ◽  
Noboru Yamazoe
Keyword(s):  
Water Treatment ◽  
Room Temperature ◽  
Oxygen Sensor ◽  
Influence Of Water

Room Temperature Aerobic Peroxidation of Organic Substrates Catalyzed by Cobalt(III) Alkylperoxo Complexes

2021 ◽  
Author(s):  
Yunzhou Chen ◽  
Huatian Shi ◽  
Chi-Sing Lee ◽  
Shek-Man Yiu ◽  
Wai-Lun Man ◽  
...  
Keyword(s):  
Room Temperature ◽  
Organic Substrates

scholarly journals Powder XRD Study of Changes of Cd2+ Modified Clinoptilolite at Different Stages of the Ion Exchange Process

Minerals ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1130
Author(s):  
Louiza Dimowa ◽  
Yana Tzvetanova
Keyword(s):  
Ion Exchange ◽  
Room Temperature ◽  
Exchange Process ◽  
Unit Cell ◽  
Powder Xrd ◽  
Structural Refinement ◽  
Ion Exchange Process ◽  
Xrd Study ◽  
Modified Clinoptilolite

Cadmium exchange on clinoptilolite is performed and structurally studied for different durations of the ion exchange process (2 h, 24 h, 72 h, 168 h, 12 days, 22 days) at room temperature and 90 °C. The distribution of Cd2+ ions in all samples is elucidated after exchange on clinoptilolite using powder XRD data processed by Rietveld structural software. Clinoptilolite is not selective for cadmium cations, but at 90 °C the exchange is ~2.5 cations per unit cell. At RT it reaches ~1.25 cations per unit cell being twice as low. The obtained maximum exchanged sample for 22 days 90 °C was structurally refined in order to find the cadmium positions in the clinoptilolite voids. The structural refinements of the occupations of the incoming and outgoing cations give an idea of how the intracrystalline diffusion is processed. A good correlation between results obtained by structural refinement of the Cd-exchanged samples and the data of the EDS measurements was achieved.

Temperature Sensitive and Reversible Halide Ion Exchange in Inorganic–Organic Hybrid CH3NH3PbI3−xBrx Mixed-Halide Perovskite

2021 ◽  
Vol 16 (4) ◽  
pp. 670-674
Author(s):  
Shuting Cui ◽  
Xun Sun ◽  
SiWen Tao ◽  
Huawei Zhou ◽  
Jie Yin ◽  
...  
Keyword(s):  
High Temperature ◽  
Ion Exchange ◽  
Band Gap ◽  
Room Temperature ◽  
Temperature Sensitive ◽  
Mechanism Study ◽  
Interesting Phenomenon ◽  
Inorganic Hybrid ◽  
Hybrid Perovskite ◽  
Halide Perovskite

Ion exchange of organic-inorganic hybrid perovskite plays a significant role in controlling the performance of materials ant its devices. In this study, an interesting phenomenon was observed that the precipitate in suspension (CH3NH3PbI3−xBrx in γ-butyrolactone) brought out different colors at high and room temperature. The mechanism study appears that the phenomenon is controlled by temperature sensitive and reversible halide ion exchange in organic-inorganic hybrid CH3NH3PbI3−xBrx mixed-halide perovskite. The results of structure phase, element composition morphology and band gap illustrate that high temperature 55 °C is beneficial to the increasing of I content in MAPbI3−xBrx and room temperature or lower is advantageous to increasing of Br content in MAPbI3−xBrx. Compared with MAPbI0.76Br2.24 precipitate acquired at room temperature, MAPbI1.17Br1.83 precipitate got at high temperature illustrate wider lattice spacing, better crystallinity, better morphology and narrower band gap. The results and findings in this study will prompt the interest of readers or experts in the field of organic-inorganic hybrid perovskite materials and related optoelectronic applications.

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