Hydrodesulfurization and hydrogenation on alumina-supported tungsten and nickel-promoted tungsten catalysts

Kabe, Toshiaki; Qian, Weihua; Funato, Asumi; Okoshi, Yuzo; Ishihara, Atsushi

doi:10.1039/a807913g

Cited by 42 publications

(18 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…It is worth remarking that the optimal catalyst composition to reach a maximum HDS activity (i.e., Ni/W $0.43) was significantly lower than those normally reported (i.e., Ni/W $0.6-1.5) [29,33,36,37] and close to the recently given by Zuo et al [38]. The higher Ni/W ratio necessary to obtain a maximum in activity for Al 2 O 3 -supported catalysts was explained by the sulfidation sequence of W and Ni.…”

Section: High Resolution Transmission Electron Microscopymentioning

confidence: 90%

“…The above-mentioned trend contrasts with the poor influence of the sulfurizing temperature on the HDS performance of alumina-supported 3Ni-19W catalyst. This is indicative of a low interaction between W-oxo species and alumina and/or a very efficient interaction among the well-dispersed oxidic precursors on the support surface that significantly facilitates the sulfurization process of W-oxo entities [37,38] and attenuates the influence of the sulfurizing temperature on the HDS catalytic performance. The apparent activation energies and the pre-exponential factors derived from Arrehenius plot for the different catalysts are presented in table 2.…”

Section: Influence Of the Sulfurization Conditions Over Hds Catalyticmentioning

confidence: 94%

See 1 more Smart Citation

Rationalizing the catalytic performance of γ-alumina-supported Co(Ni)–Mo(W) HDS catalysts prepared by urea-matrix combustion synthesis

et al. 2006

View full text Add to dashboard Cite

A comparative study of the influence of Co (or Ni) promoter loadings and the effect of different sulfurizing agents and sulfurizing temperatures on the structure, morphology and catalytic performance of Mo-or W-based hydrodesulfurization (HDS) catalysts was carried out. Catalyst performance using a tubular fixed-bed reactor and the HDS of thiophene as a model reaction was evaluated. The oxidic and sulfurized states of the HDS catalysts were characterized by laser Raman spectroscopy, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and high resolution transmission electron microscopy (HRTEM). It has been found that the urea-matrix combustion (UMxC) synthesis is a simple tool for preparing supported catalysts in a short period of thermal treatment. Several consecutive stages such as urea melting, metal precursor dissolution and chemical reactions take place before and upon combustion process. The C 4 H 4 S/H 2 -activated Co-(or Ni-) promoted MoS 2 (or WS 2 ) catalysts present a strong synergistic effect (SE) when the Co (or Ni)/Mo (or W) molar ratio is near to 0.5, whereas the C 4 /C 4 = molar ratios display a weak antagonistic effect. Alumina-supported Ni-W catalyst showed an optimal SE 2.5 times higher than those for Co (or Ni)-promoted Mo HDS catalysts. The kinetic parameters for thiophene-HDS reaction were also determined, suggesting that the C-S bond cleavage reaction for alumina-supported Co(Ni)-Mo HDS catalysts and H 2 activation reaction for Ni-promoted WS 2 catalysts play an important role in the rate-limiting step.

show abstract

Section: High Resolution Transmission Electron Microscopymentioning

confidence: 90%

Section: Influence Of the Sulfurization Conditions Over Hds Catalyticmentioning

confidence: 94%

Rationalizing the catalytic performance of γ-alumina-supported Co(Ni)–Mo(W) HDS catalysts prepared by urea-matrix combustion synthesis

et al. 2006

View full text Add to dashboard Cite

show abstract

“…The strength of the Mo-S bond on TiO2-supported catalyst is assumed to be weaker than that on Al2O3-supported catalyst20). In our previous studies17), 21), we proposed that the promoting effect of cobalt for molybdenum catalyst was due to increased mobility of the sulfur in the so-called "CoMoS" phase, in which the strength of the Mo-S bond was considered to be weakened. Therefore, TiO2 electronic promotion of the Mo phases is probably similar in nature to that of Co.…”

Section: Discussionmentioning

confidence: 99%

Investigation of Cobalt Promotion on TiO2-supported Mo Catalysts Using a 35S Tracer Method.

Wang

Qian

et al. 2002

J. Jpn. Petrol. Inst.

Self Cite

View full text Add to dashboard Cite

A series of CoMo catalysts supported on TiO2 with various Co/Mo molar ratios were prepared to investigate the relationship between the support and the promoting effect of cobalt. The catalytic activities of these catalysts were measured for the hydrodesulfurization (HDS) of dibenzothiophene (DBT). The HDS activity of Mo/TiO2 catalysts increased remarkably with increased addition of cobalt up to Co/Mo ratio of 0.2 and then increased slightly above this value. The HYD activity of these catalysts remained almost constant with increasing Co/Mo ratio. Sulfur mobility on the sulfided CoMo/TiO2 catalysts under the reaction conditions was investigated by a 35S radioisotope tracer method using 35S -labeled DBT. The rate constants of H2S release (kRE) for Co-promoted catalysts were approximately the same as those for non-promoted Mo catalysts at a given temperature, indicating that the addition of cobalt did not affect the mobility of sulfur over Mo/TiO2 catalysts.In contrast, the amount of labile sulfur (S0) increased remarkably with the addition of cobalt up to Co/Mo ratio of 0.2 and then increased slightly above this value. The increase in the catalytic activity with the addition of cobalt is probably due to an increase in the number of active sites.

show abstract

“…El catalizador NiMo 6 -O/Al presentó mayor actividad catalítica (73%), posiblemente debido a mayor área superficial o mayor disposición de sitios activos en el catalizador (no ocurrió correlación entre la actividad y el área en todos los precursores). A pesar que no hay diferencia significativa en los %p/p S para los precursores NiW 6 -O/ Al y NiMo 6 -O/Al una vez que son activados (Tabla III), sin embargo, el sólido NiMo 6 -O/Al presentó la mayor actividad (no hubo correlación directa entre la actividad y el % S), incluso que el NiMo 3 W 3 -O/Al que esperaba una mayor conversión del catalizador trimetálico NiMo 3 W 3 -O/Al como se encuentra en la literatura [23]; todo este comportamiento puede ser porque los catalizadores de tungsteno provenientes de sales oxídicas son difíciles de sulfurar, debido a que los enlaces W-O-Al y/o los W-O son más fuertes con respecto a los enlaces Mo-OAl y/o Mo-O [24], [25], [26]. En la Fig.…”

Section: Evaluación Catalítica De Hds De Tiofeno De Los Precursoresunclassified

Síntesis y caracterización de heteropolioxometalatos tipo anderson de Ni-Mo(w) soportados sobre alúmina: actividad de hidrodesulfuración de tiofeno

Julio-Julio

Puello-Polo

Brito

2016

Iteckne

View full text Add to dashboard Cite

Resumen-Se sintetizaron heteropolioxometalatos tipo Anderson (NH 4 ) 4 [NiMo 6-x W x O 24 H 6 ]•5H 2 O soportados sobre γ-Al 3 O 2 , utilizando el método de coprecipitación. Estos solidos fueron utilizados como precursores en la reacción de hidrodesulfuración (HDS) de tiofeno a 400°C. Los precursores catalíticos se caracterizaron por propiedades texturales (área específica (B.E.T) y, distribución del diámetro y volumen de poros), difracción de rayos X (DRX), espectroscopía infrarroja (FT-IR) y análisis elemental (CHON-S). Las áreas específicas estuvieron dentro del intervalo de 109 y 35 m 2 /g con una distribución del diámetro y volumen de poros de 8,9-9,6 nm y 0,11-0,34 cm 3 /g, respectivamente. were synthesized by coprecipitation. These solids were used as precursors in the thiophene hydrodesulfurization catalytic at 400 °C. The catalytic precursors were characterized by textural properties (BET specific surface area and, total pore volume and pore diameter distribution), X-ray diffraction (XRD), IR spectroscopy (FTIR) and S analysis (CHON-S). The specific surface area was between 109 and 35 m 2 /g with total pore volume and pore diameter distribution of 0,11-0,34 cm 3 /g and 8,9-9,6 nm, respectively. XRD showed the presence of NiWO 4 , (NH 4 ) 4 [NiMo 6 O 24 H 6 ]•5H 2 O and WO 3 . FTIR analysis can be assigned to the characteristic vibrations of Anderson-type structure, due to stretching and bending of the functional groups present. The NiMo 6 -O/Al precursor was the most active in the HDS, it had a conversion of 72,75% and was even more active than the AERO commercial catalyst. The results of HDS revealed that the catalytic activity increases as follows: NiMo 6 -O/Al > AERO > NiMo 3 W 3 -O/Al > NiW 6 -O/Al. The catalytic selectivity of precursors and commercial catalyst (AERO) was directed towards the cis-butene.

show abstract

Hydrodesulfurization and hydrogenation on alumina-supported tungsten and nickel-promoted tungsten catalysts

Cited by 42 publications

References 22 publications

Rationalizing the catalytic performance of γ-alumina-supported Co(Ni)–Mo(W) HDS catalysts prepared by urea-matrix combustion synthesis

Rationalizing the catalytic performance of γ-alumina-supported Co(Ni)–Mo(W) HDS catalysts prepared by urea-matrix combustion synthesis

Investigation of Cobalt Promotion on TiO2-supported Mo Catalysts Using a 35S Tracer Method.

Síntesis y caracterización de heteropolioxometalatos tipo anderson de Ni-Mo(w) soportados sobre alúmina: actividad de hidrodesulfuración de tiofeno

Contact Info

Product

Resources

About