Highly Selective and Active Niobia-Supported Cobalt Catalysts for Fischer–Tropsch Synthesis

On the superior activity and selectivity of PtCo/Nb2O5 Fischer Tropsch catalysts

“…Based on the literature [6], TPR results (SI, Fig. S11) and from environmental TEM results (vide supra), full reduction was expected for all catalysts except Co/c-Al 2 O 3 (degree of reduction $60%).…”

“…The selectivity of cobalt catalysts toward liquid hydrocarbons (C 5+ ) is affected by process conditions such as temperature [6,7], pressure [8] and CO conversion [9] and catalyst properties such as support acidity [10,11] and pore diameter [5,10] and can be promoted by partially reducible transition metal oxides such as MnO and ZrO 2 [12][13][14][15][16][17]. These promoters can be present as small particles in the close proximity to cobalt or as support material in the case of Co/TiO 2 [16,18,19] or Co/Nb 2 O 5 [6,[20][21][22][23][24] catalysts.…”

“…These promoters can be present as small particles in the close proximity to cobalt or as support material in the case of Co/TiO 2 [16,18,19] or Co/Nb 2 O 5 [6,[20][21][22][23][24] catalysts. For Nb 2 O 5 -supported cobalt catalysts, high selectivities toward heavy hydrocarbons were reported at 1 bar by Schmal and coworkers [20][21][22][23][24] and more recently at 20 bar by den Otter et al [6]. The promoting effect of niobia as support material at low pressure was extensively studied by XPS, TPR, TPO, CO TPD and IR spectroscopy and was attributed to partial reduction of the support and consequent strong metal support interaction (SMSI) [25][26][27][28][29].…”

Effect of support surface treatment on the synthesis, structure, and performance of Co/CNT Fischer–Tropsch catalysts

“…Highly active and selective catalysts have been developed [16][17][18][19][20][21]; however, these support materials often have the disadvantages of limited hydrothermal stability, low reducibility of cobalt oxide to metallic cobalt, or strong metal support interactions (SMSI) [22][23][24][25]. Various carbonaceous support materials have been introduced as promising alternatives to overcome these drawbacks, such as activated carbon (AC), carbon spheres (CS), carbon nanofibers (CNF), or carbon nanotubes (CNT) [26][27][28][29][30][31].…”

Conversion of CO2 to Light Olefins Over Iron-Based Catalysts Supported on Niobium Oxide

“…Nb 2 O 5 is used as support in many catalytic reactions (Nowak and Ziolek, 1999). There are some studies on the use of Nb 2 O 5 as support of Fischer-Tropsch catalysts using CO (Soares et al, 1993;Mendes et al, 2006a;Den Otter and De Jong, 2014;Hernández Mejía et al, 2017), but the hydrogenation of CO 2 is considerably less studied over metal-supported Nb 2 O 5 catalysts. Nozaki et al (1987) reported the use of Rh/Nb 2 O 5 catalyst in CO 2 hydrogenation to hydrocarbons.…”