Nanosized lithium orthosilicate sorbent has been prepared by precipitation, and its CO ₂ capture performance has been evaluated. The particle size of the adsorbent is small and uniform, which leads to a significant reduction of the calcination temperature and desorption temperature, thus greatly reducing the process energy consumption. Under optimum calcination temperature, relative higher kinetic absorption capacity, i.e., 17.8% within 5 minutes under volume fraction 12.5% CO ₂ model flue gas stream by absorption⁃desorption cyclic test, has been obtained. Static CO ₂ absorption test at different temperatures were well fitted by the double exponential model, demonstrating the double shell mechanism. The rate⁃determining step, Li diffusion rate from the bulk to the surface, was greatly improved even in low⁃CO ₂⁃concentration model flue gas owing to its nano⁃scale character. Therefore, this study has provided a simple and efficient preparation method for nanosized ceramic sorbents, which is promising for thermo⁃swing fluidized bed process.

2′,4′,6′-Trimethyl-2-chloro-acetophenone was catalytic synthesized from mesitylene which was obtained from by-product C ₉ aromatic hydrocarbons, the refinery and chloroacetyl chloride with Friedel-Crafts acylation reaction by metal loaded catalyst. The influencing factors in the reaction were studied by the contrastive experimental results. The results show that metal loaded catalyst has a better catalytic activity for the acylation reaction of mesitylene and chloroacetyl chloride. The study on optimization of reaction conditions indicates that the yield of acylation reaction at 80 ℃ was over 91.2% after 4 h when the mole ratio of chloroacetyl chloride and mesetylene to loaded metal catalyst was 2∶1∶0.002 5. The compound was identified by refractive index and IR spectrum.