Effect of Mg/Al atom ratio of support on catalytic performance of Co-Mo/MgO-Al2O3 catalyst for water gas shift reaction

Lian, Yixin; Wang, Hong; Zheng, Qunhao; Fang, Weiping; Yang, Yiquan

doi:10.1016/s1003-9953(08)60095-x

Cited by 34 publications

(28 citation statements)

References 31 publications

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“…Furthermore, the H 2 consumption peak of Co oxide does not individually appear in TPR profiles, which is in accordance with the results of studies by Zhang et al [14,17,18]. They reported that the TPR curves arising from the Co-Mo catalysts were always similar to that of the Mo sample alone and that the peak of Co was suppressed.…”

Section: Tpr Studiessupporting

confidence: 92%

Catalytic performance of Co-Mo-Ce-K/γ-Al2O3 catalyst for the shift reaction of CO in coke oven gas

Zhao

Zhang

2010

Front. Chem. Eng. China

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The catalytic performance of Co-Mo-Ce-K/γ-Al 2 O 3 catalyst for the shift reaction of CO in coke oven gas is investigated using X-ray diffraction (XRD) and temperature-programmed reduction (TPR). The results indicate that Ce and K have a synergistic effect on promoting the catalytic activity, and the Co-Mo-Ce-K/γ-Al 2 O 3 catalyst with 3.0 wt-% CeO 2 and 6.0 wt-% K 2 O exhibits the highest activity. CeO 2 favors Co dispersion and mainly produces an electronic effect. TPR characterization results indicate that the addition of CeO 2 -K 2 O in the Co-Mo-Ce-K/γ-Al 2 O 3 catalyst decreases the reduction temperature of active components, and part of octahedrally coordinated Mo 6+ transforms into tetrahedrally coordinated Mo 6+ , which has a close relationship with the catalytic activity.

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Section: Tpr Studiessupporting

confidence: 92%

Catalytic performance of Co-Mo-Ce-K/γ-Al2O3 catalyst for the shift reaction of CO in coke oven gas

Zhao

Zhang

2010

Front. Chem. Eng. China

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“…Sulfided Mo-based supported systems have been designed as sulfur-resistant WGS catalysts. A major part of the studies are related to the structure and activity of Co-Mo catalysts, both unpromoted [11][12][13][14][15] and promoted by alkaline metals [16][17][18][19][20]. To our knowledge, unpromoted Ni-Mo catalysts [21,22] or that promoted by alkaline metals [23] are so far less investigated.…”

Section: Introductionmentioning

confidence: 99%

Water–gas shift activity of K-promoted (Ni)Mo/γ-Al2O3 systems in sulfur-containing feed

Nikolova

Edreva-Kardjieva

Grozeva

2011

Reac Kinet Mech Cat

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The effect of potassium additive on the catalytic activity of nickelmolybdenum alumina-supported systems has been studied by varying the molybdenum content within 5-18 mass% MoO 3 , reaction temperature from 180 to 400 (500)°C, and steam to gas ratio of 0.3, 0.7, and 1. It has been established that potassium reduces the activity of one-component Mo-containing samples, while, independent of molybdenum loading, nickel promotes activity within the whole temperature range studied and extends the temperature range of catalytic activity by about 70°C to lower reaction temperatures. A symbatic or additive, or antibatic catalytic behavior was observed with NiMo-containing samples depending on the atomic Ni/Mo ratio and temperature range. Potassium, being a third component in tri-component KNiMo-containing samples, enhances the water-gas shift (WGS) activity depending on the atomic K/(Ni ? Mo) ratio. The activity approaches the equilibrium conversion degree in the interval of 320-500°C. A decrease in the specific surface area of calcined and tested samples relative to the bare support shows close values indicating that the overall dispersion of the species is not changed during the catalytic test. Close examination indicated that the sample containing K 2 O, NiO, and MoO 3 of 4.9, 2.5, and 12.7 mass%, respectively, was found to be the most suitable catalyst for water-gas shift reaction with sulfur containing feed since it attains equilibrium conversion even at 300°C, and at a low steam to gas ratio of 0.3 atm. This catalyst demonstrates a stable and reproducible catalytic activity as inlet gas loading is increased.

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“…For example, addition of magnesium oxide partially neutralizes alumina acidity and stabilizes γ-Al 2 O 3 phase inhibiting its transition to α-Al 2 O 3 [21]. It was confirmed by extensive studies carried out by Liana et al [22] which determined optimal Mg/Al ratio. When the value is increased to about 0.5 then activity grows and the fraction of molybdenum phase of octahedral coordination responsible for formation of catalytically active Co-Mo-S phase grows, too.…”

Section: Introductionmentioning

confidence: 61%

“…It is also known, that the addition of modifiers into support can be an effective way to improve distribution of active components and finally catalytic properties [21][22][23]. The introduction of other oxide modifiers to Al 2 O 3 changes the character of interactions between the active phase and the support which results in formation of active centers of higher stability on the catalyst surface.…”

Section: Introductionmentioning

confidence: 99%

Sour gas shift process over sulfided Co–Mo–K catalysts supported on carbon material — Support characterization and catalytic activity of catalysts

Antoniak‐Jurak

Kowalik

Próchniak

et al. 2015

Fuel Processing Technology

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Effect of Mg/Al atom ratio of support on catalytic performance of Co-Mo/MgO-Al2O3 catalyst for water gas shift reaction

Cited by 34 publications

References 31 publications

Catalytic performance of Co-Mo-Ce-K/γ-Al2O3 catalyst for the shift reaction of CO in coke oven gas

Catalytic performance of Co-Mo-Ce-K/γ-Al2O3 catalyst for the shift reaction of CO in coke oven gas

Water–gas shift activity of K-promoted (Ni)Mo/γ-Al2O3 systems in sulfur-containing feed

Sour gas shift process over sulfided Co–Mo–K catalysts supported on carbon material — Support characterization and catalytic activity of catalysts

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