The effect of Fe2O3 crystal phases on CO2 hydrogenation

Abstract

The effect of Fe2O3 crystal phases on their performance in CO2 hydrogenation was studied. α-Fe2O3 crystal was prepared by precipitation method from Fe(NO3)3·9H2O and (NH4)2CO3, and γ-Fe2O3 was prepared by grinding Fe(NO3)3·9H2O and L(+)-Tartaric acid in agate mortar completely. The crystal phases of Fe2O3 influence the distribution of promoter Zn, K and Cu on catalysts. The dispersity of K on γ-Fe2O3 surface is higher than α-Fe2O3. On the contrary, Cu and Zn are more dispersive on α-Fe2O3 surface than γ-Fe2O3. The catalyst in γ-Fe2O3 phase is easily reduced relative to the catalyst in α-Fe2O3 phase. The former presents higher CO2 conversion and C2+ hydrocarbon selectivity than the latter in CO2 hydrogenation.

Cu–Fe Incorporated Graphene-Oxide Nanocomposite as Highly Efficient Catalyst in the Degradation of Dichlorodiphenyltrichloroethane (DDT) from Aqueous Solution

“…The diffraction pattern of GO was matched with previously reported one [23]. [24]. Moreover, Cu-Fe/GO has also shown diffraction peaks similar to Fe/GO.…”

Hematite and Magnetite Nanostructures for Green and Sustainable Energy Harnessing and Environmental Pollution Control: A Review

“…Greenhouse gases, especially CO 2 , constantly promote the greenhouse effect and hence contribute immensely to the environmental misbalance. Therefore, to achieve environmental sustainability, researchers are trying to capture CO 2 , using highly stable and porous structures, , and convert it into useful products such as CO, and lower and higher molecular weight hydrocarbons ,,− via photocatalytic, , electrocatalytic , and photoelectrocatalytic , conversion. Correspondingly, due to adequate interfacial interaction of CO 2 , H-NPs and M-NPs are found useful and widely reported for CO 2 conversion.…”

“…Ning et al synthesized hematite (α-Fe 2 O 3 ) by precipitation method using (NH 4 ) 2 CO 3 , Fe­(NO 3 ) 3 ·9H 2 O, while γ-Fe 2 O 3 by grinding l -(+)-tartaric acid and Fe­(NO 3 ) 3 ·9H 2 O. It was reported that the dispersity of cocatalyst K on α-Fe 2 O 3 was significantly lower than the γ-Fe 2 O 3 surface, while Cu and Zn acted contrary, thus making it more reactive in CO 2 hydrogenation . Similarly, the nanocomposite of α-Fe 2 O 3 with γ-C 3 N 4 , which was synthesized by a wet-chemical process, is found exceptionally active toward photocatalytic phenol degradation and CO 2 conversion to CO and CH 4 products, compared to bare α-Fe 2 O 3 .…”

“…This can be done by trapping/converting the accumulated/releasing CO 2 to useful products and looking for alternative sources of energies. The more advanced techniques such as energy generation from solar sources, water splitting and photovoltaics by using environment-friendly resources could contribute to tackle the targeted issues to some extent. − It should be ensured that the byproducts come from these techniques are least or nonhazardous. In addition to the energy crisis, discharge of highly potent and hazardous chemical pollutants due to a high number of synthetic chemicals by related industries is another major environmental threatening issue that severely leads to aquatic and atmospheric pollution.…”

Iron-Based Composite Oxide Catalysts Tuned by CTAB Exhibit Superior NH3–SCR Performance

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