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- W2091902085 abstract "The effect of ammonia pretreatment on the reduction of CuY zeolite was investigated by means of temperature-programmed experiments with the aid of transmission electron microscopy, electron spin resonance and IR techniques. With hydrogen the reduction of Cu2+ ions occurred by a two-step mechanism, via Cu+ ions to metallic copper. In the first step of the reduction, ammonia or carbon monoxide could be used as the reducing agent instead of hydrogen. With the ammonia pretreatment metallic copper was uniformly dispersed on the reduced CuY compared to that with CO pretreatment or without pretreatment. The average diameters of the copper particles on these samples were estimated to be 8.4, 19.5 and 18.5 nm, respectively. The reason why metallic copper was homogeneously dispersed by the ammonia pretreatment is discussed." @default.
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- W2091902085 date "1988-01-01" @default.
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- W2091902085 title "Effect of preliminary treatment with ammonia on the reduction of CuY zeolite" @default.
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- W2091902085 doi "https://doi.org/10.1016/s0166-9834(00)82390-8" @default.
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