CO在Ni-Zn/C催化剂上的可逆吸附

ＣＯ在ＮｉＺｎ／Ｃ催化剂上的可逆吸附彭峰黄仲涛（华南理工大学化学工程系，广州５１０６４１）关键词一氧化碳，可逆吸附，吸附热，镍，锌，活性炭，负载型催化剂分类号Ｏ６４３／Ｏ６４７化学吸附是分子与催化剂表面原子间形成吸附化学键，具有选择性，是多相催化...

REVERSIBLE CHEMISORPTION OF CARBON MONOXIDE ON Ni Zn/C CATALYST

The adsorption of N 2 CO mixture on Ni Zn/C was investigated by pulse technique. The experimental results showed that the peaks of pulse chromatograms held constant in magnitude and retention time after the irreversible chemisorption was saturated, but the retention time of CO was longer than that of N 2. It was found that there was reversible chemisorption of CO. After the catalyst was oxidized (deactivated), the retention time of N 2 and CO was the same, and there were no reversible and irreversible chemisorption of CO. The reversible chemisorption of CO was characterized with relative retention volume and adsorption heat calculated by means of the Clapeyron Clausius relationship. The reversible adsorption heat of CO on Ni Zn/C and Ni/C was 26 6 and 31 1 kJ/mol respectively, they lay between physisorption heat and chemisorption heat. The relation between relative retention volume and turnover frequency on Ni Zn/C and Ni/C at the reaction temperature of carbonylation was compared. The more the amount of reversible adsorption is, the higher the activity for carbonylation is.