Polymeric carbon nitride nanomesh as an efficient and durable metal-free catalyst for oxidative desulfurization

Abstract

We report the first use of polymeric carbon nitride (CN) for the catalytic selective oxidation of HS. The as-prepared CN with unique ultrathin "nanomeshes" structure exhibits excellent HS conversion and high S selectivity. In particular, the CN nanomesh also displays better durability in the desulfurization reaction than traditional catalysts, such as carbon- and iron-based materials.

Morphology evolution of acetic acid-modulated MIL-53(Fe) for efficient selective oxidation of H2S

“…Further increase of temperature leads to gradually decrease of sulfur selectivity. It is because side reactions are promoted at high temperatures, leading to deep oxidation of H2S (H2S + 3/2O2 → SO2 + H2O) or oxidation of the produced sulfur (S + O2 → SO2) [49]. Nevertheless, the sulfur selectivity is still higher than 89% for MIL-53(Fe) and MIL-53(Fe)-xH catalysts at 190 °C.…”

Highly Active and Sulfur‐Resistant Fe–N4 Sites in Porous Carbon Nitride for the Oxidation of H2S into Elemental Sulfur

“…Polymeric carbon nitride (CN) was considered promising for the oxidative desulfurization in previous studies. [25][26][27][28][29] The CN is composed of infinite 2D layers of repeating tri-s-triazinebased "melon" rings. [30][31][32] Incomplete polymerization of CN would result in edges and/or defects sites, which are capable of anchoring metal atoms.…”

Tailoring Properties of Metal-Free Catalysts for the Highly Efficient Desulfurization of Sour Gases under Harsh Conditions

“…Metal-free systems of this type have successfully been scrutinized as selective and efficient catalytic materials for a number of industrially relevant oxidation [13][14][15][16][17][18] and reduction [19][20][21][22] processes or as valuable promoters of other challenging catalytic transformations [23,24]. Nanocarbonbased materials, particularly in the form of N-doped networks, have already been exploited as effective metal-free systems for the selective hydrogen sulfide oxidation to elemental sulfur from natural gas tails [16,[25][26][27][28][29][30][31][32][33]. The unique features of these single-phase systems (e.g., the absence of a metal active-phase, the prevalent basic surface character of the N-doped samples together with reduced production cost and environmental impact) have largely contributed to overcome the drawbacks classically encountered with metal nanoparticles-based catalysts.…”