Adsorption characteristics of CO2 using K2CO3 impregnated on Titanium Dioxide

• Main Authors: Yo-Wei Chen, 陳祐為
• Other Authors: Kuang-Yu Liu
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/37104146160119503556

碩士 === 國立聯合大學 === 環境與安全衛生工程學系碩士班 === 103 === The fact that greenhouse effect causes continuous rising of the earth’s surface temperature indicates the importance of CO2 capture technique in the prevention of greenhouse gas. This study tries to capture the emission of CO2 with potassium carbonate, which would adsorb CO2 through carbonization reaction and desorb CO2 at high temperatures. Hence it can be re-cycled and reused. In the previous process of potassium carbonate adsorbent preparation, the potassium on the surface of the adsorbent would often be lost due to high-temperature calcination, resulting in the reduction of the amount of adsorption. Therefore, the study focuses on potassium carbonate in combination with TiO2 as a carrier. This experiment compares the amount of adsorption in different specific surface areas of TiO2 and when the adsorbent passes different heat treatment temperatures and explores the affect of K2Ti2O5, the byproduct generated after heat treatment. The results of the study show that in comparison with that of the TiO2 powder sold commercially , the BET of the carrier material of TiO2 prepared by the researcher grows 89% in maximum, from 14.3m2/g to 130.8m2/g. The larger the specific surface area is, the higher the loading for both immerged method and through heat treatment and the better in adsorption, rising from1.12 mmole/g to 1.79 mmole/g, increasing by 37%. The study also notes that after heat treatment in a higher temperature, the amount of adsorption for composite potassium carbonate adsorbent will not be reduced in cycle adsorption. K2Ti2O5, the by product generated by the composite adsorbent of carrier material prepared by the researcher and potassium carbonate after 200℃ heat treatment would adsorb 1.78 mmole/g CO2 in the cycle adsorption experiment and 1.6 mmole/g after 5 cycles, declining rate 10%. The study discovers that this adsorbent’s effect of cycle adsorption is closely related with calcination treatment. After heat treatment at a proper temperature, the potassium carbonate on the surface can be better re-cycled and reused for adsorption.