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- W1988414926 abstract "Abstract Model mixed oxide catalysts were prepared by supporting polynuclear metal (M 3+ and Cu 2+ ) complexes of the form M[(μ-OH)Cu(μ-OCH 2 CH 2 NR 2 )] 3+ 6 (M = Al, Cr, and Fe) on Cab-O-Sil (28 wt% loading). The supported complexes exhibited both Bronsted (bridging OH groups) and Lewis (Cu 2+ ions) acidities. While the coordinatively saturated central M 3+ ion was not an available Lewis site, changing M 3+ influenced catalyst acidity through an apparent ligand effect. Reported are acidity characterizations by ammonia adsorption, first with Cu 2+ ions open to estimate overall acidity, and second with Cu 2+ ions blocked to evaluate the Bronsted acidity. Selective sorption of nitric oxide was an effective Lewis site poison at temperatures to 80 °C. Ammonia sorption to unpoisoned supported complexes revealed increasing overall acidity for the series Al to Cr to Fe (with NH 3 adsorption heats of 4.6, 8.1, and 8.2 kcal/mol, respectively). Ammonia sorption to NO-poisoned supported complexes indicated increasing Bronsted acidity with NH 3 adsorption heats of 2.6, 8.5, and 8.2 kcal/mol, respectively." @default.
- W1988414926 created "2016-06-24" @default.
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- W1988414926 date "1988-01-01" @default.
- W1988414926 modified "2023-09-23" @default.
- W1988414926 title "Polynuclear metal complexes as model mixed oxide catalysts: Selective chemisorption of ammonia and nitric oxide" @default.
- W1988414926 cites W1972510217 @default.
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- W1988414926 doi "https://doi.org/10.1016/0021-9517(88)90181-9" @default.
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