دانلود مقاله ISI انگلیسی شماره 148204
ترجمه فارسی عنوان مقاله

سینتیک جذب دی اکسید کربن با فشار بالا از هیدروالکتیت اصلاح شده پتاسیم در دمای بالا

عنوان انگلیسی
High-pressure carbon dioxide adsorption kinetics of potassium-modified hydrotalcite at elevated temperature
کد مقاله سال انتشار تعداد صفحات مقاله انگلیسی
148204 2017 12 صفحه PDF
منبع

Publisher : Elsevier - Science Direct (الزویر - ساینس دایرکت)

Journal : Fuel, Volume 207, 1 November 2017, Pages 579-590

پیش نمایش مقاله
پیش نمایش مقاله  سینتیک جذب دی اکسید کربن با فشار بالا از هیدروالکتیت اصلاح شده پتاسیم در دمای بالا

چکیده انگلیسی

A method for characterizing the high-pressure CO2 adsorption kinetics of potassium-modified hydrotalcite at elevated temperatures based on a modified static bed is proposed. The pressure drop of the adsorption tube with time was measured by a series of high-sensitivity pressure sensors to calculate the CO2 adsorption curves of the adsorbent. The concept of a hot/cold spot is introduced to eliminate the temperature deviation caused by the dead volume of the pipelines and the temperature disproportion in the tubes. As compared to conventional characterization methods such as thermal gravimetric analysis and fixed bed testing, the proposed method avoids the displacement effect, making it possible to obtain actual adsorption curves above atmospheric pressure. The effect of adsorption temperature (300–450 °C) and CO2 partial pressure (0.1–2 MPa) and a reversible adsorption isotherm with 30 min adsorption/30 min desorption, as well as desorption performance under vacuum, were investigated. The adsorption/desorption curves of hydrotalcite increased linearly with the logarithm of the adsorption time in almost all tested conditions. The CO2 uptake reached approximately 0.7 of the total adsorption capacity in less than 0.1 min of adsorption time and exceeded 0.9 after 5 min. A simple one-step kinetic model based on Elovich-type equations is built to describe the adsorption behavior of hydrotalcite at CO2 partial pressures above atmospheric pressure.