Ultra-deep hydrodesulfurization on MoS2 and Co0.1MoS2: Intrinsic vs. environmental factors

Ho, Teh C.; McConnachie, Jonathan M.

doi:10.1016/j.jcat.2010.10.017

Cited by 43 publications

(29 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Moreover, for the hydrogenation reaction catalyzed by metal sulfide catalysts, the active sites are generally believed to be sulfur vacancies, that is, the coordinatively unsaturated sites. [61][62][63] Therefore, the active Ni atom is speculated to be bonded with three sulfur atoms. Accordingly, a catalytic cycle of sulfide catalysts, including reaction, deactivation, and regeneration, is proposed, which is illustrated in Scheme 3.…”

Section: Reaction Mechanismsmentioning

confidence: 99%

Isobutane Dehydrogenation over Metal (Fe, Co, and Ni) Oxide and Sulfide Catalysts: Reactivity and Reaction Mechanism

Wang

Gao²,

Zhu

et al. 2014

ChemCatChem

View full text Add to dashboard Cite

Silica‐supported metal oxide and sulfide catalysts of Fe, Co, and Ni were evaluated comparatively for the catalytic dehydrogenation of isobutane. The results of the activity test and temperature‐programmed reduction of hydrogen characterization indicate that metal oxides, except Fe2O3, are easily reduced to metal ensembles, which are extremely active for alkane hydrogenolysis and lead to the formation of a considerable amount of methane and coke. However, the dehydrogenation performance was significantly improved after sulfidation treatment. The introduction of sulfur affects the catalysts in two ways: one is the geometric effect, which dilutes the aggregated metallic species and reduces hydrogenolysis activity, and the other is the electronic effect, which facilitates the desorption of olefin and increases the product selectivity. Moreover, the reaction mechanism is explored by using the proposed model of the interaction between isobutane and sulfide catalysts. Finally, sulfur loss and partial coke deposition are determined to be the main reasons for catalyst deactivation.

show abstract

Section: Reaction Mechanismsmentioning

confidence: 99%

Isobutane Dehydrogenation over Metal (Fe, Co, and Ni) Oxide and Sulfide Catalysts: Reactivity and Reaction Mechanism

Wang

Gao²,

Zhu

et al. 2014

ChemCatChem

View full text Add to dashboard Cite

show abstract

“…2 The above HDS reactivity trend stands in sharp contrast to that observed with certain bulk (or unsupported) metal sulfide catalysts. [6][7][8][9] For instance, the relative HDS rates of dibenzothiophene and 4,6-diethyldibenzothiophene are 100 and 1300, respectively, over a liquid-sulfided bulk CoMo catalyst at 5388K and 1.83 MPa H 2 . 9 This result shows that steric crowding can have a positive effect on the HDS reactivity of alkyl-dibenzothiophenes over certain bulk sulfide catalysts.…”

Section: Introductionmentioning

confidence: 99%

“…An HDS sulfide catalyst with a strong hydrogenation function has been known to be active for desulfurizing sterically-crowded dibenzothiophenes such as 4,6diethyldibenzothiophene. 8 However, such a catalyst would be less active for the HDS of sterically uncrowded dibenzothiophenes such as dibenzothiophene because desulfurizing dibenzothiophene favors the hydrogenolysis pathway. 8 This study attempts to exploit this dichotomy.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A theory of ultradeep hydrodesulfurization of diesel in stacked‐bed reactors

Ho¹

2017

AIChE Journal

Self Cite

View full text Add to dashboard Cite

in Wiley Online Library (wileyonlinelibrary.com)Hydrodesulfurization catalysts have two types of active sites for hydrogenation and hydrogenolysis reactions. While hydrogenation sites are more active for desulfurizing refractory sulfur species, they are more susceptible to organonitrogen inhibition than hydrogenolysis sites. In contrast, hydrogenolysis sites are more resistant to organonitrogen inhibition but are less active for desulfurizing refractory sulfur species. This dichotomy is exploited to develop an ultradeep hydrodesulfurization stacked-bed reactor comprising two catalysts of different characteristics. The performance of such a catalyst system can be superior or inferior to that of either catalyst alone. A mathematical model is constructed to predict the optimum stacking configuration for maximum synergies between the two catalysts. The best configuration provides the precise environment for the catalysts to reach their full potentials, resulting in the smallest reactor and minimum hydrogen consumption. Model predictions are consistent with experimental results. A selectivity-activity diagram is developed for guiding the development of stacked-bed catalyst systems.Bottom curve: reference catalyst followed by new catalyst configuration; middle curve: mixed-bed; top curve: new catalyst followed by reference catalyst configuration.

show abstract

“…To meet the increasing stringent environmental regulations, deep/ultra-deep desulfurization are in urgent demanding [1][2][3][4]. Hydrodesulfurization (HDS) is one of the most widely used techniques for removing sulfur-containing compounds from petroleum products in the refining industry, where HDS catalyst plays a vital role in the determining process.…”

Section: Introductionmentioning

confidence: 99%

NiMo catalysts supported on graphene-modified mesoporous TiO2 toward highly efficient hydrodesulfurization of dibenzothiophene

Wang

Xiao

Cheng

et al. 2015

Applied Catalysis A: General

View full text Add to dashboard Cite

Ultra-deep hydrodesulfurization on MoS2 and Co0.1MoS2: Intrinsic vs. environmental factors

Cited by 43 publications

References 31 publications

Isobutane Dehydrogenation over Metal (Fe, Co, and Ni) Oxide and Sulfide Catalysts: Reactivity and Reaction Mechanism

Isobutane Dehydrogenation over Metal (Fe, Co, and Ni) Oxide and Sulfide Catalysts: Reactivity and Reaction Mechanism

A theory of ultradeep hydrodesulfurization of diesel in stacked‐bed reactors

NiMo catalysts supported on graphene-modified mesoporous TiO2 toward highly efficient hydrodesulfurization of dibenzothiophene

Contact Info

Product

Resources

About