The use of in situ powder X-ray diffraction in the investigation of dolomite as a potential reversible high-temperature CO2 sorbent.
The use of in situ powder X-ray diffraction in the investigation of dolomite as a potential reversible high-temperature CO2 sorbent.
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DOI：
10.1039/b417570k
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发表时间：
2005-03
期刊：
影响因子：
--
通讯作者：
J. Readman;R. Blom
中科院分区：
文献类型：
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作者：
J. Readman;R. Blom
我们报告使用气体吸附实验和原位粉末X射线衍射研究使用白云石（MgCa（CO 3）2）作为一个潜在的可逆高温CO2吸附剂。当白云石在900摄氏度的惰性气氛中处理时，它分解成单独的富含CaO和MgO的相，并且白云石在CO2吸附时从不重整。气体吸附研究表明，煅烧白云石可以经历几个循环的CO2吸附/解吸在一个可逆的方式，但是，吸附容量减少与每个周期。只有钙似乎是参与的CO2吸附，而MgO作为载体的钙相。镁污染的钙phase. BET和SEM测量进行了一些证据，以找到差异的表面积/颗粒形态，可以解释白云石和方解石（CaCO 3）的吸附能力的相似性。
We report the use of gas sorption experiments and in situ powder X-ray diffraction to study the use of dolomite (MgCa(CO3)2) as a potential reversible high-temperature CO2 sorbent. When dolomite is treated in inert atmosphere at 900 degrees C it decomposes into separate CaO and MgO rich phases and dolomite is never reformed pon CO2 sorption. Gas sorption studies show that the calcined dolomite can go through several cycles of CO2 sorption/desorption in a reversible manner, however, the sorption capacity diminishes with each cycle. Only calcium seems to be involved in the CO2 sorption, while MgO acts as a carrier for the calcium phase. Some evidence of magnesium contamination of the calcium phase was found. BET and SEM measurements were carried out to find differences in the surface area/particle morphology that may explain similarities in the sorption capacities of dolomite and calcite (CaCO3).