Matches in SemOpenAlex for { <https://semopenalex.org/work/W1969432848> ?p ?o ?g. }
Showing items 1 to 93 of
93
with 100 items per page.
- W1969432848 endingPage "3076" @default.
- W1969432848 startingPage "3069" @default.
- W1969432848 abstract "The decomposition of the polynuclear Keggin Al13 species (Al13O4(OH)24(H2O)127+ or Al13) has been examined as a function of pH (2.06 ≤ pH ≤ 3.50), ionic strength (I = 0.1 and 1.0) and temperature (10°C ≤ T ≤ 65°C) using batch and flow-through reactors. The overall decomposition rates were found to be positively correlated with the activity of H+, ionic strength and temperature with half-lives ranging from 350 to 43,000 s. The decomposition rate was interpreted as a function of two parallel reactions, one first-order and one second-order with respect to [H+] −d[A113]dt=R1+R2 (1) where R1 = k1 [H+] [Al13] and R2 = k2 [H+]2 [Al13]. For 25°C and I = 0.1, the rate constants k1 and k2 were determined as 0.0333 ± 0.0016 M−1 s−1 and 2.59 ± 0.62 M−2 s−1, respectively. The activation energies and the Arrhenius factors for an ionic strength of 1.0 were found to be Ea1 = 13.3 ± 1.9 kJ mol−1, Ea2 = 44.9 ± 4.9 kJ mol−1, A1(I=1.0) = 25.2 ± 19.2 M−1 s−1, A2(I=1.0) = 1.62 109 ± 3.12 109 M−2 s−1. While Ea1 and Ea2 do not depend on the ionic strength, the Arrhenius factors for I = 0.1 were obtained as A1(I=0.1) = 7.23 ± 0.19 M−1 s−1 and A2(I=0.1) = 1.86 108 ± 1.9 107 M−2 s−1. The apparent charge of the Al13 complex in the encounter reaction with a hydronium ion was calculated from the Arrhenius factors at various ionic strengths as 0.78. We postulate Al13 with a protonated bridging OH group as the precursor for the decomposition reaction, first-order in [H+]. The low value of the activation energy for the one-proton pathway is explained by an exothermic formation of the precursor HAl138+. The larger value of Ea2 indicates that the formation of a precursor with two adjacent protonated sites involves a positive reaction enthalpy. The half-life of several hundred hours at pH 5 indicates that Al13 may exist in natural waters, however, it may also be subject to continuous decomposition and reformation." @default.
- W1969432848 created "2016-06-24" @default.
- W1969432848 creator A5015134976 @default.
- W1969432848 creator A5021838535 @default.
- W1969432848 creator A5077124354 @default.
- W1969432848 date "1999-10-01" @default.
- W1969432848 modified "2023-10-15" @default.
- W1969432848 title "On the chemistry of the keggin Al13 polymer: kinetics of proton-promoted decomposition" @default.
- W1969432848 cites W1977331002 @default.
- W1969432848 cites W1978896143 @default.
- W1969432848 cites W1995296500 @default.
- W1969432848 cites W2004066065 @default.
- W1969432848 cites W2023259436 @default.
- W1969432848 cites W2026709093 @default.
- W1969432848 cites W2028498253 @default.
- W1969432848 cites W2044233272 @default.
- W1969432848 cites W2047525326 @default.
- W1969432848 cites W2054496466 @default.
- W1969432848 cites W2058601631 @default.
- W1969432848 cites W2064307251 @default.
- W1969432848 cites W2084849445 @default.
- W1969432848 cites W2900207231 @default.
- W1969432848 doi "https://doi.org/10.1016/s0016-7037(99)00234-3" @default.
- W1969432848 hasPublicationYear "1999" @default.
- W1969432848 type Work @default.
- W1969432848 sameAs 1969432848 @default.
- W1969432848 citedByCount "57" @default.
- W1969432848 countsByYear W19694328482013 @default.
- W1969432848 countsByYear W19694328482014 @default.
- W1969432848 countsByYear W19694328482015 @default.
- W1969432848 countsByYear W19694328482017 @default.
- W1969432848 countsByYear W19694328482018 @default.
- W1969432848 countsByYear W19694328482019 @default.
- W1969432848 countsByYear W19694328482021 @default.
- W1969432848 countsByYear W19694328482022 @default.
- W1969432848 countsByYear W19694328482023 @default.
- W1969432848 crossrefType "journal-article" @default.
- W1969432848 hasAuthorship W1969432848A5015134976 @default.
- W1969432848 hasAuthorship W1969432848A5021838535 @default.
- W1969432848 hasAuthorship W1969432848A5077124354 @default.
- W1969432848 hasConcept C121332964 @default.
- W1969432848 hasConcept C124681953 @default.
- W1969432848 hasConcept C145148216 @default.
- W1969432848 hasConcept C147789679 @default.
- W1969432848 hasConcept C148898269 @default.
- W1969432848 hasConcept C155647269 @default.
- W1969432848 hasConcept C178790620 @default.
- W1969432848 hasConcept C179104552 @default.
- W1969432848 hasConcept C184651966 @default.
- W1969432848 hasConcept C185592680 @default.
- W1969432848 hasConcept C187428577 @default.
- W1969432848 hasConcept C2182769 @default.
- W1969432848 hasConcept C62520636 @default.
- W1969432848 hasConcept C86183883 @default.
- W1969432848 hasConcept C93391505 @default.
- W1969432848 hasConcept C95121573 @default.
- W1969432848 hasConceptScore W1969432848C121332964 @default.
- W1969432848 hasConceptScore W1969432848C124681953 @default.
- W1969432848 hasConceptScore W1969432848C145148216 @default.
- W1969432848 hasConceptScore W1969432848C147789679 @default.
- W1969432848 hasConceptScore W1969432848C148898269 @default.
- W1969432848 hasConceptScore W1969432848C155647269 @default.
- W1969432848 hasConceptScore W1969432848C178790620 @default.
- W1969432848 hasConceptScore W1969432848C179104552 @default.
- W1969432848 hasConceptScore W1969432848C184651966 @default.
- W1969432848 hasConceptScore W1969432848C185592680 @default.
- W1969432848 hasConceptScore W1969432848C187428577 @default.
- W1969432848 hasConceptScore W1969432848C2182769 @default.
- W1969432848 hasConceptScore W1969432848C62520636 @default.
- W1969432848 hasConceptScore W1969432848C86183883 @default.
- W1969432848 hasConceptScore W1969432848C93391505 @default.
- W1969432848 hasConceptScore W1969432848C95121573 @default.
- W1969432848 hasIssue "19-20" @default.
- W1969432848 hasLocation W19694328481 @default.
- W1969432848 hasOpenAccess W1969432848 @default.
- W1969432848 hasPrimaryLocation W19694328481 @default.
- W1969432848 hasRelatedWork W1976189486 @default.
- W1969432848 hasRelatedWork W2040461940 @default.
- W1969432848 hasRelatedWork W2088855430 @default.
- W1969432848 hasRelatedWork W2161069611 @default.
- W1969432848 hasRelatedWork W2518520268 @default.
- W1969432848 hasRelatedWork W2996821302 @default.
- W1969432848 hasRelatedWork W3034761738 @default.
- W1969432848 hasRelatedWork W3130208434 @default.
- W1969432848 hasRelatedWork W3155992455 @default.
- W1969432848 hasRelatedWork W2473931741 @default.
- W1969432848 hasVolume "63" @default.
- W1969432848 isParatext "false" @default.
- W1969432848 isRetracted "false" @default.
- W1969432848 magId "1969432848" @default.
- W1969432848 workType "article" @default.