Mechanistic Study of Forming Either Cyclic or Linear Sulfur‐Clusters from Thermal Decomposition of Thiourea Under Two Distinct Conditions

Abstract

Sulfur contamination has been a serious issue in oil industry so that desulfurization becomes a vital step in oil refinery to offer sulfur free products. The success of desulfurization requires disproportionation of sulfur‐containing molecules to form sulfur‐catenated compounds and further remove sulfur (S8). The reaction of ethyl acetate (EtOAc) with the gaseous components of products from the thermal decomposition of thiourea (condition 1) and the direct decomposition of thiourea in dimethyl sulfoxide (condition 2) provide two series of sulfur‐catenated molecules that have been characterized by gas chromatography‐mass spectrometry and partially by nuclear resonance spectroscopy with the help of ab initio calculation. This new method of in‐situ generating alkyl polysulfides might be applied to remove sulfur from the sulfur‐containing molecules in oil refining process to diminish the sulfur contents in oil products.

Role of carboxylates in the phase determination of metal sulfide nanoparticles

“…Thermal decomposition pathways of thiourea by itself and in the presence of other chemicals in both air and inert environments have been widely studied. 39–41 Thiourea undergoes two main thermal processes when heated to temperatures higher than 170 °C. 39 The first process, which can happen between 171.2 and 187.5 °C is the isomerization of thiourea into ammonium thiocyanate (Scheme 2).…”

Copper Sulfide and Graphite Felt Composites as Promising Electrode Materials for Sodium-Ion Batteries

“…To research new negative electrode production technologies, three hydrothermal methods of GF and Cu x S composite anode materials were successfully explored. In this work, Cu x S synthesis is carried out using different starting materials with the addition of ball-milled GF: (1) elemental copper, elemental sulfur, and GF; (2) copper sulfate, dimethyl sulfoxide (DMSO), and GF; and (3) elemental copper, ethyl acetate, thiourea, DMSO, and GF . All three synthesized and coupled GF/Cu x S electrode samples exhibited different properties, which were analyzed using X-ray diffraction analysis (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), simultaneous thermogravimetric analysis (STA), voltammetric measurements (VA) of resistivity, cyclic voltammetry (CV), and open circuit voltage (OCV) analysis.…”