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.

Heteropoly acid type ionic liquid BMAI［HPW12O40］ was synthesized as catalyst for simulate diesel oxidative desulfurization which was characterized by 1HNMR,13CNMR,IR and TG. The optimal reaction conditions were as follows: reaction temperature of 40 ℃, 15 mL oil sample, 1.75 mL hydrogen peroxide and 0.028 g heteropoly acid type ionic liquid. Under this conditions, good desulfurization ratio (95.5%) can be achieved. After the reaction, diesel oil and catalyst can be separated by simple decantation, and the activity of catalysts would not change obviously after recycling for 5 times. Furthermore, the oxidation kinetics of 4,6dimethyldibenzothiophen was investigated. The oxidation of 4,6DMDBT can be treated as a firstorder reaction, with the apparent activation energy Ea 31.55 kJ/mol and the preexponential factor K0 2.36×104 min-1.

The Lithiumbased sorbents for high temperature CO ₂ capture were prepared through solidstate reaction method and precipitation method, which were characterized by Xray diffraction(XRD) and scanning electronic microscopy(SEM). The CO ₂ absorption performance was evaluated by the chemical BET absorption(CHEMBET) method and the impact factors (including synthetic method, calcination temperature, molar ratio of Li to Si and different silica sources) were studied. The results indicated that the particle size of the adsorbents synthesized by the precipitation method distributed more homogeneous than that of the adsorbents synthesized by the solidstate reaction method at 750 ℃. Meanwhile, BET surface area of former was larger than that of latter. After six times CO ₂ (carbon dioxide to helium in a volume ratio of 1∶5) recycles, adsorption capacity of precipitationmethod adsorbents using SiO ₂II reduced to 9.92% from 13.38%, and desorption amount decreased from 11.74% to 8.52%. However, the amounts of adsorption and desorption of precipitationmethod adsorbents using SiO ₂I were reduced by 2.61% and 2.39%, those of solidstatemethod adsorbents reduced by 1.85% and 1.42%. 