Synthesis of hydrocarbons from CO and H2 in the presence of Co-Ru and Co-Pd catalysts containing aluminum oxide

Promotion Effects in Co-based Fischer–Tropsch Catalysis

“…Ru is the most studied noble metal promoter and it has been frequently showed to play a role both in structural and electronic promotion. 146,149,155,157,[160][161][162][163][164][165][166][167][168]170,174,176,177,254,260 In the early nineties, Turney et al observed that the addition of Ru to Co/CeO 2 catalysts drastically increased the Co F-T activity without modifying the catalyst selectivity. 44,45 Results obtained from XPS and TPR indicated that Ru caused a decrease of the reduction temperature of supported Co 3 O 4 nanoparticles.…”

“…In this respect, it is worthwhile to point out that Co-Ru catalysts exhibit exceptional high selectivities to C 51 products and higher turnover rates compared to unpromoted Co catalysts. 146 A remarkable insight into Ru promotion has been gained from the work of Iglesia et al 43,46 This group observed that at reaction conditions that favor the formation of higher hydrocarbons (i.e., high pressures and high conversions), the apparent turnover numbers on cobalt catalysts are independent of the support material, but are markedly increased by the addition of small amounts of Ru. They found large increases in the turnover rates and the C 51 selectivity when Ru was added to Co/TiO 2 catalysts in a ratio of Ru/Co o 0.008.…”

Role of the Various Surface Sites and Species in CO Hydrogenation Over Alumina-supported Co-Pd Catalysts

“…[44] There are numbers of studies in related literature demonstrating that the surface composition of the Со/Al2O3 system is complex and only in rare cases contains one cobalt compound. [45][46][47][48][49][50][51][52][53][54] A catalyst sample of higher activity was formed by pretreatment in air where the presence of О2 and Н2О is presumed. The reduction was carried out at 300 °C.…”