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首页> 外文期刊>Journal of thermal analysis and calorimetry >Influence of the Ni/Al ratio on Ni-Al mixed oxides and their catalytic properties for ethanol decomposition
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Influence of the Ni/Al ratio on Ni-Al mixed oxides and their catalytic properties for ethanol decomposition

机译：Ni / Al比对Ni-Al混合氧化物的影响及其乙醇分解催化性能

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摘要

The relationship between the properties with the composition of nickel-aluminium mixed oxides was investigated in this work. Ni-Al materials with Ni/Al molar ratios between 0.5 and 9 were synthesised via co-precipitation. The samples were characterised using the following techniques: surface area measurements (S (BET)), thermogravimetry, X-ray diffraction and temperature-programmed reduction, desorption and oxidation (H-2-TPR, NH3-TPD and TPO/DTA). Samples with Ni/Al ratio = 0.5 primarily formed the Al2O3 phase, whereas Ni/Al ratio = 9 mainly led to the bulk NiO phase. However, Ni/Al ratios between 1 and 3 favoured the formation of the mixed oxide phase with increased thermal stability and specific surface area and decreased crystallite sizes. The lower Ni/Al ratios led to the production of ethylene, which is likely related to the higher number of sites with stronger acidity. The samples with Ni/Al ratios of 2 and 3 promoted selectivity towards synthesis gas. For higher Ni/Al ratios, low thermal stability leading to sintering and deactivation due to coke formation was observed.
机译：在这项工作中研究了具有镍铝混合氧化物组合物的性能之间的关系。通过共沉淀合成具有Ni / Al摩尔比的Ni-Al材料。使用以下技术表征样品：表面积测量（S（BET）），热重试，X射线衍射和温度编程的还原，解吸和氧化（H-2-TPR，NH 3-TPD和TPO / DTA）。具有Ni / Al比率= 0.5的样品主要形成Al 2 O 3相，而Ni / Al比率= 9主要导致散装NiO相。然而，1至3之间的Ni / Al比有利于混合氧化物相的形成，随着热稳定性和比表面积增加，结晶尺寸降低。较低的Ni / Al比率导致乙烯的产生，其可能与酸度较强的较高的位点有关。具有2和3个比例的样品为2和3的促进对合成气的选择性。对于较高的Ni / Al比率，观察到导致焦炭形成引起的低热稳定性和由于焦炭形成而失活。

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