镍铝混合氧化物催化剂的表面性能

G.A. El-Shobaky, A.N. Al-Noaimi
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引用次数: 18

摘要

采用共沉淀法和浸渍法制备了一系列不同成分的镍铝混合氧化物。得到的固体在450-1000℃的空气中加热。通过氮吸附等温线测定各吸附剂的表面性能,即SBET、St、Vp和r。SBET随煅烧温度的变化可以计算烧结活化的表观能。结果表明,共沉淀法制备的催化剂比浸渍法制备的催化剂具有更高的比表面积。混合的氧化物固体似乎是由宽孔组成的。而浸渍法制备的吸附剂的孔隙比共沉淀法制备的吸附剂的孔窄。此外,比表面积与NiO/Al2O3的比例有关。Al2O3的存在增加了NiO晶粒的分散程度,导致其表面积显著增加,有效地延缓了NiO相的烧结。烧结活化的表观能Es表明,随着氧化铝含量的增加,表观能Es的大小也相应增加。
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Surface properties of Ni-Al mixed oxide catalysts

A series of Ni-Al mixed oxides having different compositions was prepared by coprecipitation and by impregnation. The solids obtained were heated in air at 450–1000 °C. The surface properties, namely, SBET, St, Vp and r, of each adsorbent were determined from nitrogen adsorption isotherms. The change in SBET as a function of calcination temperature permitted the calculation of the apparent energy of activation of sintering.

The results obtained revealed that the catalysts prepared by coprecipitation had higher surface areas than those obtained by impregnation. The mixed oxide solids seemed to be composed of wide pores. However, the pores of the adsorbents prepared by impregnation were narrower than those measured for the adsorbents prepared by coprecipitation. Also, the specific surface area depended on the NiO/Al2O3 ratio. The presence of Al2O3 increased the degree of dispersion of NiO grains leading to a significant increase in its surface area, with effective retardation of sintering of the NiO phase. The apparent energy Es of activation of sintering indicated that the increase in alumina content was followed by a corresponding increase in the magnitude of Es.

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