FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W1964594057> ?p ?o ?g. }

• W1964594057 endingPage "150" @default.
• W1964594057 startingPage "142" @default.
• W1964594057 abstract "The real oxidation states of active sites on the important industrial Phillips type catalysts are still unclear. In this study, Phillips catalysts calcined at different temperatures (400, 600 and 800 °C) were modified by triethylaluminum(TEA) at different Al/Cr molar ratio and subsequently characterized by X-ray photoelectron spectroscopy (XPS) method and ethylene polymerization tests in order to elucidate the real oxidation states of active sites. Activity of each catalyst increases up to a maximum value then drops down with the increasing of Al/Cr molar ratio. The TEA-modified catalyst calcined at higher temperature got a larger maximum value of polymerization activity at a lower Al/Cr molar ratio. XPS method quantified the mixed Cr oxidation states including +2, +3, +5 and +6 of surface chromium species, in which only the +2 and +6 Cr species were found to be relating to the polymerization activity. The real active chromium precursor might be a chromium cluster (Scheme 1) named as Cr2+·2Cr6+ composed of one Cr(II)Ox,surf species and two Cr(VI)Ox,surf species, in which the former acts as the real center of active Cr cluster and the latter acts as the necessary neighboring ligand environment. The relative concentration of active sites is estimated to be around 14.4–24.9 (mol % Cr) for the TEA-modified Phillips catalysts depending on the calcination temperature and Al/Cr molar ratio." @default.
• W1964594057 created "2016-06-24" @default.
• W1964594057 creator A5014129248 @default.
• W1964594057 creator A5018990525 @default.
• W1964594057 creator A5025983940 @default.
• W1964594057 creator A5039183544 @default.
• W1964594057 creator A5060094505 @default.
• W1964594057 date "2005-09-01" @default.
• W1964594057 modified "2023-10-11" @default.
• W1964594057 title "Correlation of oxidation states of surface chromium species with ethylene polymerization activity for Phillips CrOx/SiO2 catalysts modified by Al-alkyl cocatalyst" @default.
• W1964594057 cites W1426913901 @default.
• W1964594057 cites W1964167077 @default.
• W1964594057 cites W1969119413 @default.
• W1964594057 cites W1972527376 @default.
• W1964594057 cites W1975966202 @default.
• W1964594057 cites W1980333742 @default.
• W1964594057 cites W1987816989 @default.
• W1964594057 cites W1989666883 @default.
• W1964594057 cites W1998461748 @default.
• W1964594057 cites W2003565148 @default.
• W1964594057 cites W2007208463 @default.
• W1964594057 cites W2011496735 @default.
• W1964594057 cites W2014086015 @default.
• W1964594057 cites W2020878653 @default.
• W1964594057 cites W2021668838 @default.
• W1964594057 cites W2026712763 @default.
• W1964594057 cites W2030118663 @default.
• W1964594057 cites W2036334030 @default.
• W1964594057 cites W2041872036 @default.
• W1964594057 cites W2043067693 @default.
• W1964594057 cites W2043574821 @default.
• W1964594057 cites W2053327817 @default.
• W1964594057 cites W2054094427 @default.
• W1964594057 cites W2055323706 @default.
• W1964594057 cites W2055867494 @default.
• W1964594057 cites W2057768895 @default.
• W1964594057 cites W2061161443 @default.
• W1964594057 cites W2071784330 @default.
• W1964594057 cites W2071818371 @default.
• W1964594057 cites W2076360103 @default.
• W1964594057 cites W2078160492 @default.
• W1964594057 cites W2079874348 @default.
• W1964594057 cites W2090933078 @default.
• W1964594057 cites W2091015143 @default.
• W1964594057 cites W2091843420 @default.
• W1964594057 cites W2098700078 @default.
• W1964594057 cites W2105454303 @default.
• W1964594057 cites W2125343585 @default.
• W1964594057 cites W2137445398 @default.
• W1964594057 cites W2145400939 @default.
• W1964594057 cites W2170915476 @default.
• W1964594057 cites W2518851438 @default.
• W1964594057 cites W981242102 @default.
• W1964594057 doi "https://doi.org/10.1016/j.molcata.2005.05.015" @default.
• W1964594057 hasPublicationYear "2005" @default.
• W1964594057 type Work @default.
• W1964594057 sameAs 1964594057 @default.
• W1964594057 citedByCount "48" @default.
• W1964594057 countsByYear W19645940572012 @default.
• W1964594057 countsByYear W19645940572013 @default.
• W1964594057 countsByYear W19645940572014 @default.
• W1964594057 countsByYear W19645940572015 @default.
• W1964594057 countsByYear W19645940572016 @default.
• W1964594057 countsByYear W19645940572017 @default.
• W1964594057 countsByYear W19645940572018 @default.
• W1964594057 countsByYear W19645940572020 @default.
• W1964594057 countsByYear W19645940572021 @default.
• W1964594057 crossrefType "journal-article" @default.
• W1964594057 hasAuthorship W1964594057A5014129248 @default.
• W1964594057 hasAuthorship W1964594057A5018990525 @default.
• W1964594057 hasAuthorship W1964594057A5025983940 @default.
• W1964594057 hasAuthorship W1964594057A5039183544 @default.
• W1964594057 hasAuthorship W1964594057A5060094505 @default.
• W1964594057 hasConcept C127413603 @default.
• W1964594057 hasConcept C161790260 @default.
• W1964594057 hasConcept C175708663 @default.
• W1964594057 hasConcept C178790620 @default.
• W1964594057 hasConcept C179104552 @default.
• W1964594057 hasConcept C185592680 @default.
• W1964594057 hasConcept C188027245 @default.
• W1964594057 hasConcept C2778597550 @default.
• W1964594057 hasConcept C2778861492 @default.
• W1964594057 hasConcept C2780263894 @default.
• W1964594057 hasConcept C42360764 @default.
• W1964594057 hasConcept C44228677 @default.
• W1964594057 hasConcept C511782168 @default.
• W1964594057 hasConcept C521977710 @default.
• W1964594057 hasConcept C7082614 @default.
• W1964594057 hasConceptScore W1964594057C127413603 @default.
• W1964594057 hasConceptScore W1964594057C161790260 @default.
• W1964594057 hasConceptScore W1964594057C175708663 @default.
• W1964594057 hasConceptScore W1964594057C178790620 @default.
• W1964594057 hasConceptScore W1964594057C179104552 @default.
• W1964594057 hasConceptScore W1964594057C185592680 @default.
• W1964594057 hasConceptScore W1964594057C188027245 @default.
• W1964594057 hasConceptScore W1964594057C2778597550 @default.
• W1964594057 hasConceptScore W1964594057C2778861492 @default.
• W1964594057 hasConceptScore W1964594057C2780263894 @default.

• next