Unraveling the complex interactions between structural features and reactivity of iron-based catalysts across various supports in the synthesis of light olefins from syngas

The pivotal role of bromine in FeMnKBr/YNa catalyst for CO2 hydrogenation to light olefins

“…The characteristic peaks at 31.6° and 44.8° are attributed to K 2 CO 3 (110) and K 2 CO 3 (202), and the 31.4° characteristic peak is attributed to KFeO 2 (220). 33 This variation in the potassium form highlights the impact of different potassium salts on the chemical structure and potentially on the catalytic properties of the synthesized materials.…”

“…Additionally, K aided in the adsorption and dissociation of CO 2 , thereby enhancing the catalyst’s overall activity. 33 , 34 , 35 , 36 , 37 This mechanism is particularly beneficial in increasing the conversion of CO 2 into low-carbon olefins, while simultaneously reducing the selectivity of CO.…”

In-Depth Understanding of Highly Active Silicotungstic Acid Catalysts for Ethanol Dehydration to Ethylene under Industrially Favorable Conditions

“…Figure a shows the Raman spectrum of the spent 36-STA/SiO 2 catalyst. The two peaks at 1605 cm –1 (D band) and 1391 cm –1 (G band) represented the disordered carbon materials and graphitization carbon materials, respectively . Furthermore, the relative intensity ratio of the D band and G band ( I D / I G ) could be used as a marker to identify the type of carbon materials.…”

“…The two peaks at 1605 cm −1 (D band) and 1391 cm −1 (G band) represented the disordered carbon materials and graphitization carbon materials, respectively. 66 Furthermore, the relative intensity ratio of the D band and G band (I D /I G ) could be used as a marker to identify the type of carbon materials. As shown in Figure 17a, the I D /I G of the spent 36-STA/SiO 2 catalyst was 0.09, indicating that the main component of the carbon deposition was graphitization carbon, which was attributed to ring stretches of polyaromatic species.…”