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• W2330572699 endingPage "1005" @default.
• W2330572699 startingPage "994" @default.
• W2330572699 abstract "The use of nonreducible (Al2O3) and reducible (Ce0.62Zr0.38O2, CZ) carriers to support nanoscale Au has been studied in gas phase p-chloronitrobenzene hydrogenation. Reaction over Au/Al2O3 generated p-chloroaniline as the sole product, whereas Au/CZ catalyzed nitro-group reduction and dechlorination to aniline. A parallel/consecutive kinetic model has been applied to quantify selectivity for Au/CZ. Catalyst characterization has included temperature programmed reduction (TPR)/desorption (TPD), XPS, HAADF-STEM, CO adsorption-FTIR, and oxygen storage capacity (OSC) measurements. The incorporation of Au with CZ promoted reduction of the support with the generation of surface hydrogen and oxygen vacancies, where the latter was facilitated at higher reduction temperature (from 393 to 973 K). Strong Au–CZ interactions enhanced Au dispersion with a narrow size distribution (mean = 1.8–1.9 nm) and influenced adsorptive and catalytic properties. Sintering of Au (from 5.7 to 8.8 nm mean) on Al2O3 was observed with increasing reduction temperature (473–673 K). A higher H2 content in the reacting gas elevated hydrogenation (action of supported Au), whereas dechlorination (action of oxygen vacancies) over Au/CZ was favored under H2 lean conditions. The contribution of spillover hydrogen to increase selective hydrogenation rate is demonstrated. A temporal irreversible loss of activity is established and linked to Cl poisoning of oxygen vacancies." @default.
• W2330572699 created "2016-06-24" @default.
• W2330572699 creator A5005311112 @default.
• W2330572699 creator A5020996031 @default.
• W2330572699 creator A5026825263 @default.
• W2330572699 creator A5060695320 @default.
• W2330572699 creator A5062114578 @default.
• W2330572699 creator A5062814647 @default.
• W2330572699 creator A5070974365 @default.
• W2330572699 creator A5078333313 @default.
• W2330572699 date "2013-01-08" @default.
• W2330572699 modified "2023-09-23" @default.
• W2330572699 title "Reducible Support Effects in the Gas Phase Hydrogenation of <i>p</i>-Chloronitrobenzene over Gold" @default.
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