采用硝酸铜溶液和NaY分子筛溶液离子交换制备了CuY催化剂,通过加入氨水提高交换溶液的pH值以及高温焙烧活化,显著提高了该催化剂对甲醇氧化羰基化合成碳酸二甲酯的催化活性,与固相离子交换、沉积和浸渍法制备的催化剂相比,虽然铜的负载...采用硝酸铜溶液和NaY分子筛溶液离子交换制备了CuY催化剂,通过加入氨水提高交换溶液的pH值以及高温焙烧活化,显著提高了该催化剂对甲醇氧化羰基化合成碳酸二甲酯的催化活性,与固相离子交换、沉积和浸渍法制备的催化剂相比,虽然铜的负载量较低,但催化活性较高.通过元素分析、XRD、H2-TPR、XPS和Auger电子能谱(Auger electron spectroscopy,AES)等手段对CuY催化剂微观结构的表征结果表明,在Cu(NO3)2离子交换溶液中加入氨水,可促进Cu2+离子交换的进行,提高CuY催化剂的Cu交换量,并且交换的Cu2+主要位于分子筛的超笼中.在惰性气氛中焙烧活化CuY催化剂,Cu2+自还原为Cu+,氨促进了自还原过程的进行,显著提高了催化剂的活性.焙烧活化温度越高,越有利于超笼中Cu2+→Cu+的自还原过程,使超笼中Cu+的含量增加,CuY催化活性增加.进一步的研究结果表明,Y分子筛超笼中的Cu+是主要的催化活性中心.展开更多
A silica-supported cobalt catalyst was prepared by hydrogen dielectric-barrier dis- charge （H2-DBD） plasma. Compared to thermal hydrogen reduction, H2-DBD plasma treatment can not only fully decompose the cobalt pre...A silica-supported cobalt catalyst was prepared by hydrogen dielectric-barrier dis- charge （H2-DBD） plasma. Compared to thermal hydrogen reduction, H2-DBD plasma treatment can not only fully decompose the cobalt precursor but also partially reduce the cobalt oxides at lower temperature and with less time. The effect of the discharge atmosphere on the property of the plasma-prepared catalyst and the Fischer-Tropsch synthesis activity was studied. The re- sults indicate that H2-DBD plasma treatment is a promising alternative for preparing Co/SiO2 catalysts from the viewpoint of energy savings and efficiency.展开更多
文摘采用硝酸铜溶液和NaY分子筛溶液离子交换制备了CuY催化剂,通过加入氨水提高交换溶液的pH值以及高温焙烧活化,显著提高了该催化剂对甲醇氧化羰基化合成碳酸二甲酯的催化活性,与固相离子交换、沉积和浸渍法制备的催化剂相比,虽然铜的负载量较低,但催化活性较高.通过元素分析、XRD、H2-TPR、XPS和Auger电子能谱(Auger electron spectroscopy,AES)等手段对CuY催化剂微观结构的表征结果表明,在Cu(NO3)2离子交换溶液中加入氨水,可促进Cu2+离子交换的进行,提高CuY催化剂的Cu交换量,并且交换的Cu2+主要位于分子筛的超笼中.在惰性气氛中焙烧活化CuY催化剂,Cu2+自还原为Cu+,氨促进了自还原过程的进行,显著提高了催化剂的活性.焙烧活化温度越高,越有利于超笼中Cu2+→Cu+的自还原过程,使超笼中Cu+的含量增加,CuY催化活性增加.进一步的研究结果表明,Y分子筛超笼中的Cu+是主要的催化活性中心.
基金supported by National Natural Science Foundation of China(No.21076151)
文摘A silica-supported cobalt catalyst was prepared by hydrogen dielectric-barrier dis- charge （H2-DBD） plasma. Compared to thermal hydrogen reduction, H2-DBD plasma treatment can not only fully decompose the cobalt precursor but also partially reduce the cobalt oxides at lower temperature and with less time. The effect of the discharge atmosphere on the property of the plasma-prepared catalyst and the Fischer-Tropsch synthesis activity was studied. The re- sults indicate that H2-DBD plasma treatment is a promising alternative for preparing Co/SiO2 catalysts from the viewpoint of energy savings and efficiency.
