氧化铝负载的钼钴催化剂的氧化、还原和硫化形式的多孔结构和表面积

Zenon Sarbak
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引用次数: 6

摘要

考察了铝负载型钼钴催化剂的孔隙结构和比表面积对活化条件的影响。结果表明,氢还原过程以及同时进行的氢和硫化氢混合物的还原-硫化过程导致大直径孔隙的消失。这是由于在氢气和H2-H2S环境中热活化,在孔表面形成单体、二聚体和/或聚合物。根据氮吸附-解吸等温线的滞回线形状和所测样品的t图发现,主要孔隙为直径在中孔范围内的孔隙。中孔的形状类似于直径不同大小的管状毛细血管和/或管状毛细血管具有短颈和宽斜体。有些中孔可以在一端关闭。H2-H2S处理后孔径的均匀性为大直径反应物分子的扩散提供了良好的条件。这对于沥青质的解聚、金属卟啉的加氢脱金属和其他加氢处理过程等催化反应尤其重要。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Porous structure and surface area of oxide, reduced and sulphided forms of alumina-supported cobalt molybdena catalyst

The porous structure and surface area of alumina-supported cobalt molybdena catalysts were examined as functions of their activation conditions. It was revealed that the process of reduction by hydrogen as well as simultaneous reduction — sulphiding by a hydrogen and hydrogen sulphide mixture — results in the disappearance of pores of larger diameters. This is caused by the formation of monomeric, dimeric and/or polymeric species on pore surfaces as a result of thermal activation in hydrogen and H2-H2S atmospheres.

On the basis of the shapes of the hysteresis loops of nitrogen adsorption-desorption isotherms and on t plots of the samples investigated it was found that the dominant pores are those with diameters in the mesopore range.

The shapes of the mesopores resemble tubular capillaries with diameters o of various size and/or tubular capillaries with short necks and wide sloping bodies. Some of the mesopores can be closed at one end.

The uniformity of pore sizes appearing after the H2-H2S treatment provides good conditions for the diffusion of reactant molecules of large diameter. This is especially important for such catalytic reactions as depolymerization of asphaltenes, hydrodemetallization of metal porphyrins and other hydrotreatment processes.

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