Tuning catalytic performance in Fischer-Tropsch synthesis by metal-support interactions
Tuning catalytic performance in Fischer-Tropsch synthesis by metal-support interactions
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DOI：
10.1016/j.jcat.2020.12.023
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发表时间：
2021-03
影响因子：
7.3
通讯作者：
L. Macheli;E. Carleschi;B. Doyle;G. Leteba;E. van Steen
中科院分区：
文献类型：
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作者：
L. Macheli;E. Carleschi;B. Doyle;G. Leteba;E. van Steen
通过吸附四乙氧基硅烷（TEOS）到Co 3 O 4上制备的反相催化剂中的金属-载体相互作用可以通过改变溶剂混合物来操纵，从该混合物中取出TEOS。在正己烷中的Co 3 O 4纳米粒子上沉积TEOS导致在573 K下煅烧后形成的二氧化硅低聚物与钴（II，III）氧化物强烈相互作用。在水解环境中，TEOS对Co 3 O 4纳米粒子进行改性，由于水解形成表面硅酸钴，从而导致了更强的相互作用。表面硅酸盐的存在导致在接近工业条件下操作的费托合成中一氧化碳消耗的周转频率的强烈增加。所获得的活性变化伴随着向更多链烷烃产物的转变。
Metal-support interactions in inverse catalysts prepared by adsorbing tetraethoxysilane (TEOS) on to Co3O4can be manipulated by varying the solvent mixture, from which TEOS is taken up. Deposition of TEOS on Co3O4nanoparticles in n-hexane results in the formation of silica oligomers after calcination at 573 K interacting strongly with cobalt(II,III)oxide. Modification of Co3O4nanoparticles with TEOS in a hydrolysing environment results in a stronger interaction due to the formation of surface cobalt silicate formed through hydrolysis. The presence of surface silicates results in a strong increase in the turnover frequency of carbon monoxide consumption in the Fischer-Tropsch synthesis operating at close to industrial conditions. The obtained activity change is accompanied with a shift to a more paraffinic product.