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提出了一种简便的TPD谱图处理法——等脱附速率法。此法与查表法相结合,有助于确定脱附反应动力学级数。实验证明,该法适用于从一级或二级脱附反应TPD谱求解脱附活化能E_d和指前因子k_o值。 相似文献
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Rayleigh and Hyper-Rayleigh scatterings (HRS) from the nano-particle SnO2 were measured. It is found that as the concentration of the colloidal SnO2 or radiation power increases, the first- and second-order polarizabilities decrease. The radiation power dependencies of the first- and second-order polarizabilities show two domains: in high radiation power domain, the first- and second-order polarizabilities are approximately constant, in low radiation power domain, the first- and second-order polarizabilities increase sharply and become sensitive to the radiation power. The behavior of the concentration dependencies of the first- and second-order polarizabilities of colloidal SnO2 particles is similar to that of the radiation power dependence. A detailed mechanism explaining these phenomena has been discussed. 相似文献
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本文研究了(Fe,Cr)3O4催化剂的表面酸性,发现其表面结构具有可变性,表面主要存在Fe2+(α位)和Fe3+(β位)两种酸中心,β位上吸附吡啶的Ed=278.8±13.8kJ/mol。 相似文献
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The polarizabilities of ZrO_2 and SiO_2 nanoparticles were studied on the basis of hyper Rayleigh scattering measurement.It was found that the polarizability of system depended on both particle size and concentration. 相似文献
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从TPD谱图求解Ed、ko的等脱附速率法 总被引:2,自引:1,他引:2
提出了一种简便的TPD谱图处理法——等脱附速率法。此法与查表法相结合, 有助于确定脱附反应动力学级数。实验证明, 该法适用于从一级或二级脱附反应TPD谱求解脱附活化能E_d和指前因子k_o值。 相似文献
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用 XRD,TPD MS,SEM,LRS,Mossbauer谱和流动法 TPD 等技术,研究了Fe_2O_3-Cr_2O_3间的SOOI效应,发现这一效应的存在会导致(Fe,Cr)_3O_4催化剂相和表面相结构的变化。当Cr_2O_3>17%时,有新相生成;(Fe,Cr)_3O_4表面结构随Gr_2O_3从4.6增至21.2%时,由氧化性转变为还原性;当(Fe,Cr)_30_4表面的Fe~(3+)与Fe~(2+)表面浓度相当时,水煤气变换反应的比活性最好。 相似文献
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目的探讨双侧骶1椎弓根螺钉结合髂骨螺钉固定技术在治疗骶髂复合体损伤中的临床疗效.方法对23例骶髂复合体损伤患者,采用后路切开复位、双侧骶1椎弓根螺钉与伤侧髂骨螺钉连接固定后环,外固定支架固定前环的方法治疗.结果23例患者均可在术后1~3d床上45°~60°半卧位坐起,能使下肢足跟不离床面作屈伸髋膝关节及45°左右侧卧,而骶髂部无明显不适;术后影像学检查显示骨折和/或脱位获得解剖或接近解剖复位.21例获得随访,随访时间10~19个月,均能正常行走,仅1例56岁患者劳累后出现腰骶部酸痛,余均无明显骶髂关节疼痛等后遗症,功能恢复良好,疗效满意.结论后环双侧骶1椎弓根螺钉结合伤侧髂骨螺钉固定、前环外固定支架固定治疗骶髂复合体损伤,具有疗效确切、并发症及后遗症少、护理方便等优点,临床应用安全可行. 相似文献