Preparation of Nanocrystalline Iron Carbide by Reaction of Iron with Methane

Abstract

The process of the formation of nanocrystalline iron carbide in the reaction of nanocrystalline iron with pure methane, or CH 4 /H 2 (2 :1) gas mixture under atmospheric pressure, at 580 O C has been studied. The carburisation process has been controlled by a thermobalance. The rate of the carburisation process depended on the chemical composition of the iron surface and on the process conditions. As a result of the process, iron carbide is obtained together with unconverted a-iron or a carbon deposit. The optimal conditions to produce iron carbide only can be reached when the reaction rate is lowered, by the dilution of methane with hydrogen, or by a modification of the surface of the nanocrystalline iron. The samples before and after the carburisation process have been characterised by XRD. The average size of the iron carbide crystallites produced was 35 nm.

Preparation of Fe-cored carbon nanomaterials from mountain pine beetle-killed pine wood

“…Graphite diffraction peaks usually appear at 2θ¼261(002), 42.91(100), and 43.71(101) [1]. Arabczyk et al [11] also reported the preparation of nanocrystalline iron carbide by reduction of iron with methane under atmospheric pressure at 580 1C. The amorphous carbon region with the diffraction intensity less than 151gradually decreased as temperature increased.…”

“…Fig. or α-Fe (2θ¼ 43.41) and γ-Fe (2θ¼44.61) [10][11][12][13]. Graphite diffraction peaks usually appear at 2θ¼261(002), 42.91(100), and 43.71(101) [1].…”

Optimization of the Production Parameters of Composites from Sugarcane Bagasse and Iron Salts for Use in Dye Adsorption

“…01-071-4648) [36–38]. Iron carbide is often obtained with unconverted Fe 0 or a carbonaceous deposit [39]. It is also observed that iron oxide (mainly magnetite) was converted into iron carbide (Fe 3 C), evidenced by the complete disappearance of crystalline oxide peaks in the diffractogram of the sample obtained at 600°C [40].…”

Case study on a fire within a road‐based portable bitumen storage tanker

“…The bitumen will also usually contain at least some sulfur—even after the air‐blowing process—which can lead to the production of H 2 S during processing and storage, which can then sometimes remain dissolved in the bitumen. Excessive heating of the bitumen during storage can increase the rate at which H 2 S is released, and the released H 2 S—which is heavier than air—can displace air within the tank, creating a toxic and corrosive environment within the tank .…”

“…It has been shown in available literature that iron carbide, specifically cementite (Fe 3 C), eta‐iron carbide (Fe 2 C) and iron percarbide (Fe 20 C 9 ), can be formed through contact with methane and carbon monoxide . Iron carbide can form on a free‐iron surface or can form by converting iron oxides, like Fe 2 O 3 , into iron carbides .…”