研究含铟锌浸出渣在硫酸溶液中的浸出过程动力学,考察搅拌转速、硫酸浓度、三价铁浓度、反应温度和矿物粒度等对铟浸出速率的影响。结果表明,浸出过程可用没有固体产物层生成的"未反应核收缩模型"描述,浸出反应的表观活化能为...研究含铟锌浸出渣在硫酸溶液中的浸出过程动力学,考察搅拌转速、硫酸浓度、三价铁浓度、反应温度和矿物粒度等对铟浸出速率的影响。结果表明,浸出过程可用没有固体产物层生成的"未反应核收缩模型"描述,浸出反应的表观活化能为Ea=47.14 k J/mol,对硫酸浓度与三价铁浓度的表观反应级数分别为0.985和-0.096,含铟锌浸渣的浸出过程受化学反应速度控制。展开更多
An effective method for the regeneration of thermally deactivated commercial monolith SCR catalysts was investigated. Two types of regenerated solutions, namely NH4C1 （l mol/L） and dilute H2SO4 （0.5 tool/L）, were ...An effective method for the regeneration of thermally deactivated commercial monolith SCR catalysts was investigated. Two types of regenerated solutions, namely NH4C1 （l mol/L） and dilute H2SO4 （0.5 tool/L）, were employed to treat the used catalyst. The effects of temperature and the regeneration process on the structural and textural properties of the catalysts were determined by X-ray diffraction, scanning electron microscopy, N2 adsorption/desorption, elemental analysis and Fourier transform infrared spectroscopy. The results suggest that the anatase phase of the used catalyst is maintained after exposure to high temperatures. Some of the catalytic activity was restored after regeneration. The catalyst regenerated by aqueous NH4C1 had a higher activity than that of the catalyst treated by dilute H2SO4. The main reason is that the NH3 generated from the decomposition of NH4C1 at high temperatures can be adsorbed onto the catalyst which promotes the reaction. The aggregated V205 were partially re-dispersed during the regeneration process, and the intrinsic oxidation of ammonia with high concentrations of O2 is a factorthat suppresses the catalytic activity.展开更多
A regenerative absorption process for removal of SOx from FCC off-gas using LAS/ H2SO4 solution as absorbant was studied and pilot-plant experiments were carried out. A mass transfer- reaction model for the SO2 absorp...A regenerative absorption process for removal of SOx from FCC off-gas using LAS/ H2SO4 solution as absorbant was studied and pilot-plant experiments were carried out. A mass transfer- reaction model for the SO2 absorption process was established based on pilot-plant experiments, and the concentration distribution of components in the liquid film, and the partial pressure and mass transfer rate of SO2 along the height of the absorption tower, was calculated from this model. The numerical simulation results were compared with the experimental results and proved that the model can be used for describing the SO2 absorption process.展开更多
文摘研究含铟锌浸出渣在硫酸溶液中的浸出过程动力学,考察搅拌转速、硫酸浓度、三价铁浓度、反应温度和矿物粒度等对铟浸出速率的影响。结果表明,浸出过程可用没有固体产物层生成的"未反应核收缩模型"描述,浸出反应的表观活化能为Ea=47.14 k J/mol,对硫酸浓度与三价铁浓度的表观反应级数分别为0.985和-0.096,含铟锌浸渣的浸出过程受化学反应速度控制。
基金This work was supported by the natural science foundation of Hebei Province, China （E2014203135） and Independent research project of YanShan University Young teachers, China （14LGA015）.
文摘An effective method for the regeneration of thermally deactivated commercial monolith SCR catalysts was investigated. Two types of regenerated solutions, namely NH4C1 （l mol/L） and dilute H2SO4 （0.5 tool/L）, were employed to treat the used catalyst. The effects of temperature and the regeneration process on the structural and textural properties of the catalysts were determined by X-ray diffraction, scanning electron microscopy, N2 adsorption/desorption, elemental analysis and Fourier transform infrared spectroscopy. The results suggest that the anatase phase of the used catalyst is maintained after exposure to high temperatures. Some of the catalytic activity was restored after regeneration. The catalyst regenerated by aqueous NH4C1 had a higher activity than that of the catalyst treated by dilute H2SO4. The main reason is that the NH3 generated from the decomposition of NH4C1 at high temperatures can be adsorbed onto the catalyst which promotes the reaction. The aggregated V205 were partially re-dispersed during the regeneration process, and the intrinsic oxidation of ammonia with high concentrations of O2 is a factorthat suppresses the catalytic activity.
文摘A regenerative absorption process for removal of SOx from FCC off-gas using LAS/ H2SO4 solution as absorbant was studied and pilot-plant experiments were carried out. A mass transfer- reaction model for the SO2 absorption process was established based on pilot-plant experiments, and the concentration distribution of components in the liquid film, and the partial pressure and mass transfer rate of SO2 along the height of the absorption tower, was calculated from this model. The numerical simulation results were compared with the experimental results and proved that the model can be used for describing the SO2 absorption process.
