We demonstrate for the first time that a short time of microwave irradiation on the oxide precursor of a Cu/ZnO/Al2O3 catalyst can provide unique opportunity for tailoring the microstructure and activity of the cataly...We demonstrate for the first time that a short time of microwave irradiation on the oxide precursor of a Cu/ZnO/Al2O3 catalyst can provide unique opportunity for tailoring the microstructure and activity of the catalyst for methanol steam reforming. It is shown by in situ XRD that a considerable increase in the microstrain of Cu nanocrystals could be achieved in the catalysts processed by microwave irradiation for 310 min, which correlates well with the enhanced CH3OH conversion as observed on the corresponding samples. The present work also confirms that although the high specific surface area of Cu is a prerequisite for catalytic activity, it does not account for the observed changes in activity and selectivity alone without taking bulk microstructural changes into account.展开更多
A number of nanostructured carbon materials were proposed as new effective promoters for preparing modified Cu/ZnO/Al 2O 3 catalyst system for efficient hydrogen production from methanol steam reforming. Compared to t...A number of nanostructured carbon materials were proposed as new effective promoters for preparing modified Cu/ZnO/Al 2O 3 catalyst system for efficient hydrogen production from methanol steam reforming. Compared to the catalysts modified by other type of carbon materials, the ACF-promoted catalyst prepared via carbonate-coprecipitation method exhibit the highest performance in the low-temperature steam reforming of methanol. It was suggested that the intrinsic high surface area nature of ACF material may favor the generation of modified catalysts with a high surface area and improved component dispersion, thus leading to improved performance for methanol steam reforming.展开更多
针对微细通道反应器内甲醇水蒸汽重整制氢反应,建立了二维稳态多组分传输反应模型。分析了通道几何尺寸的变化对产物的组成以及通道内部温度分布的影响。结果表明,通道长高比的增加能增强通道壁面与流体的换热性能,提高甲醇转化率和产...针对微细通道反应器内甲醇水蒸汽重整制氢反应,建立了二维稳态多组分传输反应模型。分析了通道几何尺寸的变化对产物的组成以及通道内部温度分布的影响。结果表明,通道长高比的增加能增强通道壁面与流体的换热性能,提高甲醇转化率和产物中氢含量,但同时也会造成产物中 CO 含量的增加,影响到质子交换膜燃料电池的正常工作。展开更多
The effects of reaction temperature,input velocity,molar ratio of methanol to water and reaction time on the conversion of methanol,concentration of carbon monoxide and selectivity of carbon dioxide in the micro-chann...The effects of reaction temperature,input velocity,molar ratio of methanol to water and reaction time on the conversion of methanol,concentration of carbon monoxide and selectivity of carbon dioxide in the micro-channel reactor were investigated.The optimum reaction conditions of micro-channel reactor are as follows:reaction temperature is 260℃,input velocity of methanol liquid is 0.04ml/min and ratio of water to methanol is 1.3.At this reaction conditions,the selectivity of carbon dioxide is 94.3% and conversion of methanol is 52.9%.展开更多
文摘We demonstrate for the first time that a short time of microwave irradiation on the oxide precursor of a Cu/ZnO/Al2O3 catalyst can provide unique opportunity for tailoring the microstructure and activity of the catalyst for methanol steam reforming. It is shown by in situ XRD that a considerable increase in the microstrain of Cu nanocrystals could be achieved in the catalysts processed by microwave irradiation for 310 min, which correlates well with the enhanced CH3OH conversion as observed on the corresponding samples. The present work also confirms that although the high specific surface area of Cu is a prerequisite for catalytic activity, it does not account for the observed changes in activity and selectivity alone without taking bulk microstructural changes into account.
文摘A number of nanostructured carbon materials were proposed as new effective promoters for preparing modified Cu/ZnO/Al 2O 3 catalyst system for efficient hydrogen production from methanol steam reforming. Compared to the catalysts modified by other type of carbon materials, the ACF-promoted catalyst prepared via carbonate-coprecipitation method exhibit the highest performance in the low-temperature steam reforming of methanol. It was suggested that the intrinsic high surface area nature of ACF material may favor the generation of modified catalysts with a high surface area and improved component dispersion, thus leading to improved performance for methanol steam reforming.
文摘针对微细通道反应器内甲醇水蒸汽重整制氢反应,建立了二维稳态多组分传输反应模型。分析了通道几何尺寸的变化对产物的组成以及通道内部温度分布的影响。结果表明,通道长高比的增加能增强通道壁面与流体的换热性能,提高甲醇转化率和产物中氢含量,但同时也会造成产物中 CO 含量的增加,影响到质子交换膜燃料电池的正常工作。
文摘The effects of reaction temperature,input velocity,molar ratio of methanol to water and reaction time on the conversion of methanol,concentration of carbon monoxide and selectivity of carbon dioxide in the micro-channel reactor were investigated.The optimum reaction conditions of micro-channel reactor are as follows:reaction temperature is 260℃,input velocity of methanol liquid is 0.04ml/min and ratio of water to methanol is 1.3.At this reaction conditions,the selectivity of carbon dioxide is 94.3% and conversion of methanol is 52.9%.
