Abstract
SO2 which is usually emitted at high temperature is one of the most important air pollutants. It is of great significance to develop high temperature SO2 adsorbent with high efficiency and low cost. In this work, a series of hydrotalcite-like compound-derived CaAlO and CaXAlO(X = Ce, Co) were prepared by coprecipitation and calcination method, and were employed as adsorbents for SO2 adsorption at high temperature (700 °C). The structure and surface properties of these adsorbents were characterized by XRD, Brunauer–Emmett–Teller (BET), Derivative thermogravimetric analysis (DTG) and CO2-TPD (temperature programmed desorption) measurement. Addition of a minor amount of Ce, Co (5 wt%) could significantly increase the number of weak alkalinity sites. CaO in CaCeAlO showed the best SO2 adsorption capacity of 1.34 g/g, which is two times higher than that of CaO in CaAlO (0.58 g/g).
Highlights
IntroductionSO2 is regarded as one of the most important air pollutants due to its contribution to acid rain formation and direct threat to public health
Derived from CaAl Hydrotalcite-LikeSO2 is regarded as one of the most important air pollutants due to its contribution to acid rain formation and direct threat to public health
Process in the oil refining enterprises, about 5–10% of feed sulfur originated with crude oil is converted to SOX (SO2 ≥ 90%) and emitted with high temperature (650–700 ◦ C) and high concentration, which accounts for about 5% or even higher of total SO2 emission [1]
Summary
SO2 is regarded as one of the most important air pollutants due to its contribution to acid rain formation and direct threat to public health. Restricting SO2 emissions from coal/oil combustion sources is of great importance. Process in the oil refining enterprises, about 5–10% of feed sulfur originated with crude oil is converted to SOX (SO2 ≥ 90%) and emitted with high temperature (650–700 ◦ C) and high concentration (around 2000 ppmv, in China), which accounts for about 5% or even higher of total SO2 emission [1]. With the increase in throughput of FCC units and sulfur content in crude oil, the problem of SO2 pollution is becoming more and more prominent. It is urgent to control SO2 emitted from such sources characterized with high temperature and high concentration
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