Catalysts Cu Ox/γ-Al_2O_3-IH and Cu Ox/γ-Al_2O_3-IM were prepared, characterized, and tested for styrene combustion in the absence and presence of water vapor. The effect of copper valence of the catalysts on the ca...Catalysts Cu Ox/γ-Al_2O_3-IH and Cu Ox/γ-Al_2O_3-IM were prepared, characterized, and tested for styrene combustion in the absence and presence of water vapor. The effect of copper valence of the catalysts on the catalytic activity for styrene combustion was discussed using the theory of hard soft acids and bases(HSAB).The results showed that the existence of water vapor in feed stream inhibited the catalytic activity for styrene combustion due to the competition adsorption of water molecule. HSAB theory confirmed that the local soft acidity of the catalyst Cu Ox/γ-Al_2O_3-IH was much stronger than that of the catalyst Cu Ox/γ-Al_2O_3-IM because of the higher content of soft acid Cu+on its surface, which increased the adsorption ability toward soft base of styrene and reduced the adsorption toward hard base of water vapor, and thus increased the catalytic activity for styrene combustion and weakened the negative influence of water vapor.展开更多
Theoretical research on hard and soft acids and bases (HSAB) has been getting to the bottom recently, and solidly theoretical sets have been developed by summarizing and classifying the measured values. In practice, i...Theoretical research on hard and soft acids and bases (HSAB) has been getting to the bottom recently, and solidly theoretical sets have been developed by summarizing and classifying the measured values. In practice, it has been developed to quantitatively expounding numbers of questions from qualitatively interpreting many chemical phenomena.展开更多
基金Supported by the National Natural Science Foundation of China(21366008)the Foundation of Guizhou University((2010)040)the Science & Technology Foundation of Guizhou Province((2012)2152)
文摘Catalysts Cu Ox/γ-Al_2O_3-IH and Cu Ox/γ-Al_2O_3-IM were prepared, characterized, and tested for styrene combustion in the absence and presence of water vapor. The effect of copper valence of the catalysts on the catalytic activity for styrene combustion was discussed using the theory of hard soft acids and bases(HSAB).The results showed that the existence of water vapor in feed stream inhibited the catalytic activity for styrene combustion due to the competition adsorption of water molecule. HSAB theory confirmed that the local soft acidity of the catalyst Cu Ox/γ-Al_2O_3-IH was much stronger than that of the catalyst Cu Ox/γ-Al_2O_3-IM because of the higher content of soft acid Cu+on its surface, which increased the adsorption ability toward soft base of styrene and reduced the adsorption toward hard base of water vapor, and thus increased the catalytic activity for styrene combustion and weakened the negative influence of water vapor.
文摘Theoretical research on hard and soft acids and bases (HSAB) has been getting to the bottom recently, and solidly theoretical sets have been developed by summarizing and classifying the measured values. In practice, it has been developed to quantitatively expounding numbers of questions from qualitatively interpreting many chemical phenomena.
