Advanced Materials Research Vols. 953-954

Abstract: Many factors can influence coal gas desorption. In this paper, the impact of coal particle size on coal gas desorption under the effect of microwave radiation was mainly studied. Infrared (IR) spectroscopy and optical fiber sensor were used to on-line detect and the qualitative and quantitative analysis of the desorbed gas. The analysis results of the infrared spectrogram showed that under the effect of electromagnetic radiation (2450Hz, 1.5μT), different particle sizes of coal sample could desorb gas which contained carbon dioxide, carbon monoxide and methane. The comparison of gas content detected by optical fiber sensor indicated that coal particle sizes had a significant influence on coal gas desorption. When coal particle was between 100 and 200 meshes, the gas content reached up to 27.58 m³/t.

Abstract: Oxygen adsorption and CO₂ produced of samples at different adsorption temperatures was investigated, Combined with thermal analysis method, the combustion properties of coal samples was determined. The results show that the oxygen adsorption capacity and CO₂ produced of the samples increase and later decrease with the enhanced of pyrolysis degree. In the process of low-temperature oxidation, coal molecular side chains break, then H₂O, CO, CO₂ and so on are detected in turn; with the enhanced of pyrolysis degree, it reveals that combustion reaction activity decreased and spontaneous combustion tendency weakened.

Abstract: HZSM-5 catalysts with SiO₂/Al₂O₃ molar ratio of 80 were treated with 0.4 mol/L Na₂CO₃ solution at 80°C for 2 h to improve diffusion properties. Further, some of these catalysts were modified by impregnation of La (NO₃)₃. These catalysts characterized by XRD and BET were evaluated in a fixed bed reactor for conversion of methanol to gasoline (MTG) reaction. The Na₂CO₃ treatment results in formation of mesoporous structure in ZSM-5 zeolite. Meanwhile, LaZSM-5/AT catalyst exhibits significantly enhancement in catalytic lifetime and liquid hydrocarbons yield as well as selectivity of isoparaffin and olefin. The conversion of methanol remains above 80 % over 125 h on LaZSM-5/AT catalyst under atmospheric pressure, 380°C and weight hourly space velocities (WHSV) of 1.5 h^-1.

Abstract: As a diluent, nanocopper was mixed with HZSM-5 for gasoline production from methanol. Diluents have positive effect on the catalyst stability, for diluents help to enhance heat emission. C2-C3 alkenes and DME contents increased obviously while C₃H₈ content decreased with the addition of copper. COx and H₂ were also observed for the methanol reforming on Cu species. The content of different compositions in the oil products were almost the same as that on HZSM-5 catalyst without diluents.

Abstract: Au/ZSM-5 was prepared by improved desorption-precipitation (DP) method using urea as precipitant. Au-samples were characterized by TEM, UV-Vis, XRD, pyridine-FTIR, FTIR and the other techniques. The catalytic performance of Au/ZSM-5 catalysts was carried out on the catalytic cracking of butane by mini-scale pulse reactor. Results showed that: 2.0wt% loading Au/ZSM-5 catalyst obtained the best activity that the n-butane conversion rate comes to 58% by weight,60% olefin selectivity and 10% aromatics selectivity; the i-butane conversion rate comes to 53%, 35% olefin selectivity and 15% aromatics selectivity.

Abstract: Cetyl trimethyl ammonium bromide/sodium dodecyl benzene sulfonate (CTAB/SDBS) complex formulation of scale effect on the spontaneous formation of vesicles and the influence of different factors on the stability of vesicles were discussed, structure and morphology of vesicles were observed.

Abstract: Cetyl trimethyl ammonium bromide/sodium dodecyl sulfate (CTAB/SLS) complex formulation of scale effect on the spontaneous formation of vesicles and the influence of different factors on the stability of vesicles were discussed, structure and morphology of vesicles were observed.

Abstract: Emulsification of pyrolysis oil produced from plastic waste has been experimented. The employed cascade heating steps and heating rates pyrolysis process provides 80% product yield using waste plastic or recycles HDPE pellets as a raw material. Water-in-oil emulsion is produced ultrasonically and mechanically with Span80 as a surfactant. The emulsion stability was assessed by water droplet size and visual observation of any phase separation. An ultrasonic mixer is found to be more effective than mechanical homogenizer in terms of homogenous stability to emulsify plastic oil with water. For emulsion with 10% water by volume, the emulsion is observed to be stable for up to 24 hours after mixing.

Abstract: The supported chloride-free copper based catalyst was prepared by deposition-precipitation method and used to catalyze the direct vapor-phase oxycarbonylation of methanol to dimethyl carbonate (DMC). The effect of reductive agent and copper salt precursor on catalyst structure and catalytic performance were investigated, the catalysts were characterized by XRD, H₂-TPR techniques. Using Cu (CH₃COO)₂ as precursor, glucose as reductive agent, when loading amount was 17.1%, the Cu₂O/AC catalyst shows the best performance for DMC synthesis. Under the condition of CO/MeOH/O₂=5/11/1, SV=6625h^-1, the average STY of DMC in 9 hrs running was 71.96mg/(g·h), and selectivity of DMC was 83.13%.

Abstract: Compatibilization via transreactions in blends of poly (butylene succinate-co-butylene terephthalate) [P(BS-co-BT)] with poly (hydroxy ether of bisphenol-A) (phenoxy) were investigated. Analyses were based on characterization using differential scanning calorimetry (DSC) and solid-state nuclear magnetic resonance (NMR). They revealed that the P(BS-co-BT)/phenoxy blend had a phase morphology that could be homogenized only following annealing at high temperatures. As-blended P(BS-co-BT)/phenoxy (50/50 composition) exhibited immiscible phases with two distinct T_gs, but the initially phase separated blends finally merged to form a homogeneous phase with a single T_g upon heating and annealing for 60 min at 280 °C. Chemical exchange reactions upon heat-annealing were likely to have caused the phase homogenization in the P(BS-co-BT)/phenoxy blend. NMR was performed on blend samples before and after they were heated to 280 °C, but the similarity of bonds made obtaining straight results difficult. Results of this study demonstrate phase homogenization can be brought only upon heat-annealing in the P(BS-co-BT)/phenoxy blend.