The reversibility of the reaction CaCO3 ⇄ CaO+CO2

Wiley - Tập 23 Số 10 - Trang 733-742 - 1973
Ronald Barker1
1Electricity Council Research Centre, Capenhurst, Chester CHI 6ES

Tóm tắt

AbstractThe reversibility of the reaction CaCO3 ⇌ CaO+CO2 has been examined through a large number of cycles (up to 40), mainly at 866 °C. The decomposition to the oxide is always 100% but the reactivity of the oxide so formed to carbon dioxide falls off markedly after a rapid initial reaction. There is a large increase in surface area on going from the non‐porous calcium carbonate to the oxide and this is due to the formation of pores, mostly very small (< 4 nm). The fast component of the back reaction is a surface reaction and the subsequent slow reaction is controlled by the slow diffusion of carbon dioxide through the newly formed carbonate layer. The reversibility of the reaction decreases with the number of cycles, rapidly at first and then more slowly: the first effect is probably due to loss of pore volume in the oxide and the second to sintering of the carbonate.

Từ khóa


Tài liệu tham khảo

Barker R.Electricity Council Research Centre Report N571.1972 December.

Stern K. H.;Weise E. L.High Temperature Properties and Decomposition of Inorganic Salts.Part 2:Carbonates.1969 NSRDS‐NBS30.

Nitsch W. Z., 1962, Elektrochem., 66, 703

10.1111/j.1151-2916.1958.tb13521.x

Cremer E., 1959, Tonind. Ztg keram. Rdsch., 83, 579

10.1021/ja01269a023

Weast R. C., 1969, Handbook of Chemistry and Physics, B186

Young D. A., 1966, Decomposition of Solids., 2

Gregg S. J., 1967, Adsorption, Surface Area and Porosity., 123

10.1016/0009-2509(70)85038-2

Thông tin
Thông tin xuất bản

Wiley

Tập 23 Số 10

733-742

Thông tin tác giả