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sodium promoter
相关语句
  钠助剂
     EFFECT OF SODIUM PROMOTER ON STRUCTURE AND CATALYTIC PERFORMANCE OF Fe/SiO_2 IN OCM REACTION
     钠助剂对Fe/SiO_2催化剂结构及其催化甲烷氧化偶联反应性能的影响(英文)
短句来源
     Silica-supported iron was taken as a probe to explore the effect of sodium promoter on the structure of Fe/SiO2 and its catalytic performance in OCM reaction using XRD, XANES and EXAFS techniques.
     以二氧化硅担载铁氧化物(1wt% Fe/SiO2)为探针,结合XRD、XANES以及EXAFS分析结果首次从表面配位几何的观点讨论了钠助剂对Fe/SiO2催化剂结构及其甲烷氧化偶联反应性能所产生的影响。
短句来源
  相似匹配句对
     Aromatase promoter I .
     本研究克隆了芳香酶组织特异性启动子promoter Ⅰ.
短句来源
     Sodium Nitroprusside
     硝普钠
短句来源
     Cefazolin sodium
     唑啉头孢菌素钠盐
短句来源
     STUDY ON FLOTATION AND ACTION MECHANISM OF APATITE USING SODIUM OLEATE AND PROMOTER
     油酸钠和增效剂浮选磷灰石及其作用机理研究
短句来源
     Increase of contents of potassium sodium tartrate, additive A and promoter M would improve soln.
     酒石 酸 钾钠 、添 加剂 A、促进 剂 M 含量 的增加均 会提高镀 液稳定 性而降低 镀速;
短句来源
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Silica-supported iron was taken as a probe to explore the effect of sodium promoter on the structure of Fe/SiO2 and its catalytic performance in OCM reaction using XRD, XANES and EXAFS techniques. XRD results indicate that SiO2 support still remains its amorphous feature in 1wt%FeISO2 after calcined at 8000℃, while a sample promoted with sodium and calcined at 8000℃, i.e. 1wt%Na-1wt%Fe/SiO2, is transformed to a-cristobalite structure. EXAFS analyses reveal that the total coordination number of...

Silica-supported iron was taken as a probe to explore the effect of sodium promoter on the structure of Fe/SiO2 and its catalytic performance in OCM reaction using XRD, XANES and EXAFS techniques. XRD results indicate that SiO2 support still remains its amorphous feature in 1wt%FeISO2 after calcined at 8000℃, while a sample promoted with sodium and calcined at 8000℃, i.e. 1wt%Na-1wt%Fe/SiO2, is transformed to a-cristobalite structure. EXAFS analyses reveal that the total coordination number of the nearest oxygen neighbors is 5.0 at an average Fe-O bond length of 0.194 nm for Fe/SiO2, whereas only 4.1 at a greatly shortened Fe-O bond length of 0.189 nm for Na-Fe/SiO2. XANES results show that the active species of the catalysts gradually migrated from octahedral (Oh) site to tetrahedral (Td) one due to the participation of sodium promoter. In spite of the conversion of CH4 decreased over Na-Fe/SiO2 instead of Fe/SiO2, the selectivity to C2 hydrocarbons promoted Ca. 42%, suggesting that a mixed majorityTd/minority-Oh surface coordinate geometry structure effectively suppressed the deep oxidation of CH4 and remarkably enhanced the selectivity to C2 hydrocarbons.

以二氧化硅担载铁氧化物(1wt% Fe/SiO2)为探针,结合XRD、XANES以及EXAFS分析结果首次从表面配位几何的观点讨论了钠助剂对Fe/SiO2催化剂结构及其甲烷氧化偶联反应性能所产生的影响。XRD分析表明,Fe/SiO2经800℃焙烧后仍保持无定形特征,添加钠助剂并经800℃焙烧后,N2Fe/SiO2已转化为α-方石英结构。Fe/SiO2的EXAFS拟合结果显示,铁中心被5个近邻氧环绕,平均Fe-O键长为0.194nm。与Fe/SiO2相比,Na-Fe/SiO2的径向结构函数谱中最强峰的相对强度提高了1/4,表明形成了一个更加密集的Fe-O壳层。拟合结果表明围绕中心铁原子0.189nm处平均有4.1个氧近邻。Fe-K边XANES谱表明钠的参与使催化剂的活性组分由配位不饱和的八面体位逐渐向四配位四面体位迁移。甲烷氧化偶联反应结果显示,添加钠助剂后甲烷转化率有所下降,但是C2烃的选择性提高了近42个百分点,COx的选择性则明显下降。说明钠的引入使催化剂的表面结构发生变化,所形成的多数四面体/少数八面体混合结构有效地抑制了甲烷的深度氧化,乙烯乙烷的选择性明显提高。

The effects of sodium promoters on the catalytic properties of PtSn/γ-Al_2O_3 catalysts for propane dehydrogenation have been studied by H2 chemisorptions,thermal gravity(TG),temperature-programmed reduction(TPR) and microreactor tests.It has been found that adding Na~+ to the PtSn/A12O3 can improve its catalytic stability for dehydrogenation of propane.However,excess addition of Na+ leads to remarkable decrease in the catalytic activity of the catalysts.The results have shown that adding Na+ to the PtSn/AI203...

The effects of sodium promoters on the catalytic properties of PtSn/γ-Al_2O_3 catalysts for propane dehydrogenation have been studied by H2 chemisorptions,thermal gravity(TG),temperature-programmed reduction(TPR) and microreactor tests.It has been found that adding Na~+ to the PtSn/A12O3 can improve its catalytic stability for dehydrogenation of propane.However,excess addition of Na+ leads to remarkable decrease in the catalytic activity of the catalysts.The results have shown that adding Na+ to the PtSn/AI203 can decrease the amount of coke formed on the catalysts and increase the bare fraction of metallic Pt surface after carbon deposition,which is correlated to its higher catalytic stability.The TPR results indicated that Na~+ inon promoters in the Pt SnNa/Al~2O~3 catalysts destroy the interaction between tin oxides and alumna support,thus tinoxides are easier to reduce to metallic state and form PtSnalloys,which results in the remarkable decrease of H_2 uptake and the catalytic activity for propane dehydrogenation.

采用氢化学吸附、热重和程序升温还原等多种物理化学手段结合微型催化反应研究了添加Na+对负载型PtSn/γ-Al2O3催化剂丙烷脱氢反应性能、催化剂表面酸性、金属表面性质以及负载组分—载体相互作用的影响。发现添加一定量的Na+可以减少催化剂的积炭量,提高催化剂的金属表面裸露度,从而改善催化剂的脱氢反应稳定性。而引入较多的Na+虽可以提高催化剂抗积炭性能,但破坏了Pt—Sn—Al2O3之间的相互作用,锡组分易被还原,催化剂活性表面减小,从而对催化剂脱氢反应活性有抑制作用。

 
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