Studies of the Fischer—Tropsch Synthesis. VII. Nitrides of Iron as Catalysts¹

Enhancement of Light Olefins Selectivity Over N-Doped Fischer-Tropsch Synthesis Catalyst Supported on Activated Carbon Pretreated with KMnO4

“…In contrast, Bao's group [21] has investigated the enhancement of iron nitrides supported on carbon nanotube (CNT) walls catalysts. They synthesized a series of FeN/CNT catalysts by heating conventional Fe/CNT catalysts at 450 • C in ammonia stream and found that iron nitride (Fe 2 N) exhibits higher activity and C 2 -C 4 alkenes selectivity than iron carbides, which also verifies the proposition suggested by Anderson et al [22]. Moreover, the effects of Mn and K added to FeN/CNT catalyst that prohibit second hydrogenation and facilitate CO adsorption are discussed [23].…”

“…In this procedure, ammonium iron citrate was decomposed and the volatilized NH 3 replaced oxygen atoms in iron oxide by nitridation process. Then the formation of iron nitride is preceded through the incorporation of nitrogen into the iron lattice [22]. Specially, based on the XRD spectrum analysis result, another type of iron nitride (ζ-Fe 2 N, JCPDS No.…”

FeN particles confined inside CNT for light olefin synthesis from syngas: Effects of Mn and K additives

“…In the 1950s, nitrided iron catalysts were first used for FTS by Anderson et al at the Bureau of Mines [8]. Those epsilon iron nitride (Fe 2 N) catalysts were reported to exhibit a high activity, stability and an unusual selectivity to a relatively low molecular * Corresponding authors.…”

“…weight product (a selectivity of 57.2 wt% to C 1-4 hydrocarbons) with respect to the conventional reduced iron as a catalyst (47.3%) [8,9]. Yeh et al supported iron nitride on silica, which also yielded a higher olefin selectivity, but at the same time larger proportions of higher molecular weight products than iron carbide catalyst [10].…”

Freeze-dried precursor-based synthesis of new polymetallic oxynitrides, V1−u−zCruMoz(OxNy),V1−u−zCruWz(OxNy), Cr1−u−zMouWz(OxNy) (u, z=0.2, 0.33, 0.4, 0.6, u+z<1), and VzCrzMozWz(OxNy) (z=0.25)

“…Indeed, some monometallic derivatives have proved to be adequate to replace noble metals in a variety of catalytic processes [12]. Molybdenum and tungsten oxynitrides are examples of promising materials in this field owing to their activity and selectivity in processes like ammonia synthesis [13][14][15], Fischer-Tropsh reaction [16][17][18][19][20], hydrogenation [21][22][23][24], oxidation [25][26], hydrodenitrogenation and hydrodesulfurization [27][28][29][30][31]. Also, it has been demonstrated how, in many cases, the presence of additional metallic elements in the catalyst can improve its performance.…”