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以[Ca24Al28O64]4+·4O-(C12A7-O-)为催化剂,在流动反应器中研究了苯羟基化合成苯酚的转化率以及苯酚的选择性.苯的转化率随反应温度增加而增加,苯酚的选择性与温度及反应物的组成有关.此外还通过XRD、EPR和FT-IR对催化剂的结构,表面及内部物种进行了考察.结果表明,C12A7-O-的电正性骨架结构在反应前后几乎没有任何差别,样品内部有部分O-和O2-在反应后转化为OH-.中性物种及负离子中间体分别由Q-MS和TOF-MS所检测.活性的O-和OH-被认为在苯酚形成过程中起了重要作用. 相似文献
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以生物油基合成气的模拟气H2/CO/CO2/N2(62/8/25/5,体积比)为原料,采用固定床反应器,在1.5 MPa、300 o C、W=F=12.5 gcath/mol的条件下,研究了钾助剂及钾的添加量对沉淀铁催化剂费托合成催化活性及产物选择性的影响.生物油基合成气是通过生物油催化蒸汽重整得到.研究发现,钾的添加促进了沉淀铁催化剂费-托反应及逆水气变换反应的活性.此外,钾的加入增加了碳氢产物的平均分子量(链长).结果表明,随着钾助剂含量的增加,甲烷的选择性降低,液相碳氢产物(C5+)的选择性增加.通过多种方法,例如X射线衍射、X射线光电子能谱及比表面等对不同钾含量的费托合成催化剂进行了表征.通过费托合成实验和催化剂的表征,选出100Fe/6Cu/16Al/6K(质量比)作为生物油基合成气费-托合成最适宜的催化剂. 相似文献
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Hydrogen production by catalytic steam reforming of the bio-oil, naphtha, and CH4 was investigated over anovel metal-doped catalyst of (Ca24Al28O64)4+¢4O-/Mg (C12A7-Mg). The catalytic steam reforming wasinvestigated from 250 to 850 ±C in the ˉxed-bed continuous °ow reactor. For the reforming of bio-oil, theyield of hydrogen of 80% was obtained at 750 ±C, and the maximum carbon conversion is nearly close to95% under the optimum steam reforming condition. For the reforming of naphtha and CH4, the hydrogenyield and carbon conversion are lower than that of bio-oil at the same temperature. The characteristics ofcatalyst were also investigated by XPS. The catalyst deactivation was mainly caused by the deposition ofcarbon in the catalytic steam reforming process. 相似文献
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