Applied Catalysis A: General ( IF 5.5 ) Pub Date : 2017-08-14 , DOI: 10.1016/j.apcata.2017.08.017 James Paterson , Mark Peacock , Ewen Ferguson , Manuel Ojeda , Jay Clarkson
By using in situ X-ray diffraction, we were able to demonstrate the effect of H2O on the reduction of cobalt oxide particles for Fischer-Tropsch Synthesis. Reduction of Co3O4 to Co via CoO in H2 produces large quantities of water, which was thought to have an impact upon the reduction of the catalyst down a reactor bed. Bed profiles are produced from saturation of the bottom of the catalyst bed from the H2O produced from the top of the bed. This contribution clearly shows the impact of H2O on the cobalt crystallites to hinder reduction and facilitate sintering of the cobalt particles. In situ X-ray diffraction was used to follow the reduction of the cobalt phase throughout the evolution of the reduction process, while controlled water production and cofeed was used to study the effect across different water levels (from 0 up to 1% H2O). Each study in turn produced clear transitions to CoO and Co metal, while H2O shifted the peaks to higher transition temperatures and slowed the reduction process to cobalt metal.
中文翻译:
费-托催化剂的原位X射线衍射-水对钴氧化物还原的影响
通过使用原位X射线衍射,我们能够证明H 2 O对费托合成中氧化钴颗粒还原的影响。通过在H 2中通过CoO将Co 3 O 4还原为Co会产生大量的水,这被认为会对反应器床层催化剂的还原产生影响。床轮廓是由床顶部产生的H 2 O使催化剂床底部饱和而产生的。这一贡献清楚地表明了H 2 O对钴微晶的影响,以阻止还原并促进钴颗粒的烧结。原位在整个还原过程中,X射线衍射用于追踪钴相的还原过程,而受控的产水量和共进料用于研究不同水位(从0到1%H 2 O)的影响。每项研究依次产生了向CoO和Co金属的清晰过渡,而H 2 O将峰移至更高的过渡温度,并减慢了还原为钴金属的过程。