Abstract Chemical-looping combustion (CLC), which has the characteristic of greenhouse gas CO2 inherent separation, is a novel combustion technology. In this study, CLC experiments of methane using CaSO4 oxygen carrier with lime addition were carried out in a batched fluidized bed reactor, where the sample was exposed to alternate oxidizing and reducing conditions. The influences of temperature, calcium-to-sulphur ratio and lime particle size on the conversion of CaSO4 and sulfur capture were investigated and a suitable operation condition was determined. Under the optimal operation condition, a multi-cycle test was performed to evaluate the cyclic redox behavior of the lime-promoted CaSO4 sample. X-ray diffraction and a field emission scanning electron microscope were used to characterize the phase and surface morphology of the samples used. The results show that the addition of lime could improve the conversion rate of CaSO4 and the capture efficiency of sulfur-containing gases. The operation conditions of calcium-to-sulfur ratio 0.8, lime particle size of 180-250 μm and operation temperature of 900 °C turned out to be the optimal conditions. Besides, the average desulphurization rate of lime was up to 78.77% during the cyclic test.

Abstract Rosa Laevigata Michx., contents of bioactive components contribute to the health beneftis of consuming fresh, snacks and medicine, is widely used as the Chinese medicinal herbs. The effect of fruit ripening on the bioactive compounds and antioxidant capacity of Rosa laevigata Michx fruits was investigated. The results showed that, the bioactive compounds, including titratable acidity, reducing sugar, total ascorbic acid, total polyphenol and total flavonoids, significant changes occurred at different ripening stages. The contents of reducing sugar, total polyphenol and total flavonoids were directly proportional to the maturity. However, the content of titration acid and ascorbic acid is inversely proportional to the maturity. Antioxidant capacity and ROS inhibition are proportional to the maturity, and the antioxidant capacity of Rosa laevigata Michx significantly increase during maturity. The Rosa laevigata Michx fruits at fully ripe stage had higher healthcare and medicinal value.