In the work, nano-sized MoO3and unsupported MoS2hydro desulfurization catalysts were synthesized using a novel hydrothermal reduction method. The influences of the temperature and the synthetic methods on the growth morphology of molybdenum disulfide were systematically investigated. It was found that the MoS2fibers were easy to be bended and had lots of defects, which increased the number of active sites on the catalyst and easily met the requirements of deep hydrotreating desulfurization of diesel oil.
Unsupported MoS2hydrodesulfurization(HDS) catalysts is sulfide in its original state, so there is no need to add toxic sulfur compounds to presulfurize the hydrogenation catalyst, which has ultra-high capacity to HDS and causing attentions. This paper focuses on summarizing the preparation, characterization and desulfurization mechanism of unsupported nano MoS2catalyst and provides its future research directions.
Five kinds of unsupported MoS2hydrodesulfurization catalysts and the precursor of MoS2catalyst, nanosized MoO3, were synthesized by a novel hydrothermal reduction method. The influence of temperature, concentration of reactants and pH values on the growth morphology of MoS2was systematically investigated. The MoS2fibers showed lots of defects and they were easily bended, which increased the number of active sites on the catalyst and easily met the requirements of hydrotreating ultra-desulfurization of fuel oil.
The manifolds are flow distribution devices commonly used in the heating furnaces, heat exchangers, reactors, boilers, and so on. The flow distribution uniformity in the manifolds, to a large extent, decides the operation safety and economy of these devices. Manifolds are consisted of a number of T-type pipes, the flow characteristics in the T-type pipe takes an important role in the flow distribution non-uniformity of manifolds, so flow characteristics in T-type pipes were systematically researched and analyzed by the Fluent simulation software in this paper, exploring the influencing factors such as the inlet mass flow rate on flow distribution non-uniformity, and providing some measures to improve the flow distribution uniformity.
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