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| 1 | Mechanism of fluidized chlorination reaction of Kenya natural rutile ore显示文摘In this paper, the thermodynamics and kinetics of nature rutile carbochlorination in a fluidized-bed were investigated. The thermodynamic calculations of TiO2–C–Cl2system show that when C is excess in the solid phase,titanium tetrachloride and carbon monoxide can exist stably. At high temperature, the reaction with CO as the product is the dominant reaction. The appropriate reaction conditions are as follows: reaction temperature of 950 °C,reaction time of 40 min, carbon ratio of 30 wt% of rutile,natural rutile particle size of-96 lm, petroleum coke size of-150 lm, and chlorine flow of 0.036 m3 h-1. Under the above conditions, the reaction conversion rate of TiO2 can reach about 95 %. This paper proposed a reaction rate model, and got a rutile chlorination rate formula, which is generally consistent with the experimental data. For the TiO2–C–Cl2system, the reaction rate is dependent on the initial radius of rutile particle, density, and the partial pressures of Cl2. From 900 to 1,000 °C, the apparent activation energy is 10.569 kJ mol-1, and the mass diffusion is found to be the main reaction-controlling step. The expression for the chlorine reaction rate in the C–Cl2system is obtained, and it depends on the degree of reaction,the partial pressure of Cl2, and the size of rutile particle. | Li-Ping Niu Pei-Yuan Ni Ting-An Zhang Guo-Zhi Lv Ai-Ping Zhou Xi-bin Liang De-long Meng | 2014 | Rare Metals2014，33，4： | 5 |
| 2 | Effects of Mo on phase structure and up-conversion emissions of Er:Al_2O_3 nanocrystals显示文摘A simple and efficient approach was presented to enhance up-conversion emissions significantly for the Er:Al2O3 nanocrystals by Mo support (Er-Mo:Al2O3) with a 976 nm laser diode excitation. Mo support had evident effects on the phase structure and up-conversion emissions for the Er:Al2O3 nanocrystals, which promoted the -(Al,Er)2O3 transformed to -(Al,Er,Mo)2O3 phase. Compared with the Er:Al2O3, the maximal green and red up-conversion emissions intensities increased about 3×103 and 1.4×102 times for the Er-Mo:Al2O3 nanocrystals, respectively. It suggests that the enhancement of up-conversion emissions is caused by the high excited state energy transfer process from |4I15/2, 3T2> state of the Er3+-MoO42 dimer to the 4F7/2 level of Er3+. | LIU Dan CONG Yan | 2012 | Science China(Physics,Mechanics & Astronomy)2012，55，8： | 1 |
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