Influence of the support on the catalytic performance of Mo, CoMo, and NiMo catalysts supported on Al2O3 and TiO2 during the HDS of thiophene, dibenzothiophene, or 4,6-dimethyldibenzothiophene

Castillo-Villalón, Perla; Ramı́rez, Jorge; Cuevas, Rogelio; Vázquez, Pamela; Castañeda, Rosalba

doi:10.1016/j.cattod.2015.06.008

Cited by 49 publications

(18 citation statements)

References 72 publications

(77 reference statements)

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“…Some previous works have tried to use titanium for hydro-processing and TiO 2 -supported metal catalysts have been reported to produce higher hydrodesulfurization activity compared to those supported by Al 2 O 3 [19][20][21]. Similar information has also been reported by Castillo-Villalón et al Enhanced Mo/TiO 2 catalyst activity has been seen to produce a slight increase in direct desulfurization while significantly enhancing hydrogenation [22]. Synergy usually occurs between the support and the active metal components of the hydrocracking catalyst with the use of titanium as opposed to aluminum.…”

Section: Catalyst Characterizationsupporting

confidence: 71%

Optimization of Bio-Hydrogenated Kerosene from Refined Palm Oil by Catalytic Hydrocracking

2019

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In this work, hydro-processing was used as an alternative route for producing bio-hydrogenated kerosene (BHK) from refined bleached deodorized palm oil (RPO) in the presence of a 0.5 wt% Pd/Al2O3 catalyst. The Box-Behnken Design was used to determine the effects of reaction temperature, H2 pressure, and reaction time in terms of liquid hourly space velocity (LHSV) on BHK production. The kerosene selectivity was used as the response for staticial interpretation. The results show that both temperature and LHSV produced significant effects, whereas H2 pressure did not. The optimal conditions were found to be 483 °C, 5.0 MPa, and 1.4 h−1 LHSV; these conditions provided approximately 57.30% kerosene selectivity and a 47.46% yield. The BHK product had a good heating value and flash point. However, the mass percentage of carbon and hydrogen was 99.1%, which is just below the minimum standard (99.5%), according to the carbon loss by the reaction pathway to form as CO and CO2. Water can be produced from the reaction induced by oxygen removal, which results in a high freezing point.

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Section: Catalyst Characterizationsupporting

confidence: 71%

Optimization of Bio-Hydrogenated Kerosene from Refined Palm Oil by Catalytic Hydrocracking

2019

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“…TiO2 that formed electronegative Mo resulted in the highest HCK activity, whereas MgO that formed the least electronegative Mo resulted in the lowest HCK activity. These findings agree with a recent study 14) in which MoS2 on TiO2 possessed strong metallic character and had high catalytic activities.…”

Section: Catalysts Supported On Four Types Of Metalsupporting

confidence: 93%

Morphology, Dispersion and Catalytic Functions of Supported Molybdenum Sulfide Catalysts for Hydrotreating Petroleum Fractions

Shimada

2016

J. Jpn. Petrol. Inst.

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The relationships between the morphologies and dispersion of supported Mo sulfide catalysts and their catalytic functions evaluated by model test reactions are reviewed. The catalyst support had large effects on the morphologies through the electronic interaction and geometrical relationship between the catalyst and the support surface. High hydrogenation activities were obtained for Al2O3 supported catalysts due to high dispersion, whereas high hydrogenolysis activities were obtained for TiO2-supported catalysts due to the electronic interaction. Relatively large single-layered MoS2 structures were formed on the {110} γ-Al2O3 surface, whereas microclusters and multilayered MoS2 structures were more favorably formed on the {111} and {100} γ-Al2O3 surfaces. Multi-layered MoS2 structures had the edge-bonding orientation on anatase-TiO2 with an epitaxial relationship by sulfidation in H2S/N2. Single-layered MoS2 catalysts exhibited relatively hydrogenation-oriented function, whereas multilayered MoS2 catalysts had relatively hydrogenolysis-oriented function. Steric hindrance affected the catalytic functions, particularly in hydrogenation that required η 6 adsorption of aromatic rings. Long-term uses in hydrotreating caused growth of the MoS2 structures in the lateral direction, which decreased the number of active sites. Simultaneously, the aging caused deep sulfiding of the catalysts, which weakened the interaction with the support and increased the intrinsic activities of the catalysts.

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“…As mentioned earlier, the research directed to modulate the metal-support interaction can be envisaged from many viewpoints, such as the use of crystallographic phases different from the typical gamma alumina [38] or supporting the active phases over unconventional single metal (Ms) oxides such as those based on Ti [26,[39][40][41][42][43][44][45], Zr [26,[41][42][43][44]46,47], Si [23,26,[48][49][50] or Ga [51]. Nevertheless, more recently to gain advantage from the individual single metal oxide properties and to overcome their intrinsic limitations, several binary mixed oxide materials such as Al2O3-Ga2O3 [50], Al2O3-TiO2 [4,52-57], ZrO2-TiO2 [35,58,59], Al2O3-ZrO2 [60][61][62], MgO-TiO2 [63], Al2O3-MgO [56,64], Mn-Al2O3 [65][66][67], and Al2O3-zeolite [68] have been studied, among several others that have been tested to prepare HDS catalysts.…”

Section: Mixed Oxides Support: a Different Approachmentioning

confidence: 99%

Recent Insights in Transition Metal Sulfide Hydrodesulfurization Catalysts for the Production of Ultra Low Sulfur Diesel: A Short Review

et al. 2019

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The literature from the past few years dealing with hydrodesulfurization catalysts to deeply remove the sulfur-containing compounds in fuels is reviewed in this communication. We focus on the typical transition metal sulfides (TMS) Ni/Co-promoted Mo, W-based bi- and tri-metallic catalysts for selective removal of sulfur from typical refractory compounds. This review is separated into three very specific topics of the catalysts to produce ultra-low sulfur diesel. The first issue is the supported catalysts; the second, the self-supported or unsupported catalysts and finally, a brief discussion about the theoretical studies. We also inspect some details about the effect of support, the use of organic and inorganic additives and aspects related to the preparation of unsupported catalysts. We discuss some hot topics and details of the unsupported catalyst preparation that could influence the sulfur removal capacity of specific systems. Parameters such as surface acidity, dispersion, morphological changes of the active phases, and the promotion effect are the common factors discussed in the vast majority of present-day research. We conclude from this review that hydrodesulfurization performance of TMS catalysts supported or unsupported may be improved by using new methodologies, both experimental and theoretical, to fulfill the societal needs of ultra-low sulfur fuels, which more stringent future regulations will require.

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Influence of the support on the catalytic performance of Mo, CoMo, and NiMo catalysts supported on Al2O3 and TiO2 during the HDS of thiophene, dibenzothiophene, or 4,6-dimethyldibenzothiophene

Cited by 49 publications

References 72 publications

Optimization of Bio-Hydrogenated Kerosene from Refined Palm Oil by Catalytic Hydrocracking

Optimization of Bio-Hydrogenated Kerosene from Refined Palm Oil by Catalytic Hydrocracking

Morphology, Dispersion and Catalytic Functions of Supported Molybdenum Sulfide Catalysts for Hydrotreating Petroleum Fractions

Recent Insights in Transition Metal Sulfide Hydrodesulfurization Catalysts for the Production of Ultra Low Sulfur Diesel: A Short Review

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