Effect of tungsten deposition method on K-modified NiW/γ-Al2O3 as sulphur-tolerant water–gas shift reaction catalyst

Nikolova, D.; Vakros, John; Grozeva, T.; Lycourghiotis, Alexis; Tyuliev, G.; Edreva-Kardjieva, R.; Kordulis, Christos

doi:10.1016/j.apcata.2015.08.030

Cited by 5 publications

(2 citation statements)

References 59 publications

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“…82 Moreover, the significant signals at 864 cm −1 and 366 cm −1 are assigned to the symmetric stretching vibrations of [WO 4 ] 2− and the Ni-W-O bonds, 42,82 respectively. This confirms that there are a lot of NiWO 4 -like species 83 on the NiW/USY-ASA-0.4/2 catalyst. Similarly, the slight signal at 864 cm −1 for the NiW/ USY-ASA-0.4 catalyst is consistent with the existence of the Ni-W-O crystalline phase or the NiO-WO 3 mixed phase with the low reduction temperature at 719 °C in Fig.…”

Section: In Situ Raman Spectroscopysupporting

confidence: 74%

Effect of two-component amorphous silica-alumina (ASA) with different Si/Al molar ratios on hydrocracking reactions for increasing naphtha over NiW/USY-ASA

Sun²,

Zhang

et al. 2022

Catal. Sci. Technol.

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Section: In Situ Raman Spectroscopysupporting

confidence: 74%

Effect of two-component amorphous silica-alumina (ASA) with different Si/Al molar ratios on hydrocracking reactions for increasing naphtha over NiW/USY-ASA

Sun²,

Zhang

et al. 2022

Catal. Sci. Technol.

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“…Hence, there is growing interest in sulphur resistant H 2 separation membranes. 1 Various types of sulfur-resistant catalysts have been reported in the literature, such as W-based catalysts, 2,3 Mobased catalysts [4][5][6][7] lanthanide oxysulfide La 2 O 2 S, 8,9 noble metal catalysts (Rh, 10,11 Pt (ref. [11][12][13]), and phosphide catalysts.…”

Section: Introductionmentioning

confidence: 99%

Sulfur resistant La_xCe_1−xNi_0.5Cu_0.5O₃ catalysts for an ultra-high temperature water gas shift reaction

Oemar

Bian

Hidajat

et al. 2016

Catal. Sci. Technol.

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A series of La x Ce 1−x Ni 0.5 Cu 0.5 O 3 catalysts was synthesized to study the effect of Ce substitution for La. XRD results show that only a small amount of Ce (10%) is allowable to substitute La to maintain the perovskite structure. The La 0.9 Ce 0.1 Ni 0.5 Cu 0.5 O 3 catalyst has the smallest metal particle size and the highest oxygen mobility among all tested catalysts as observed from the XRD, TPD-O 2 , and XPS results of reduced catalysts. These two factors are very important in achieving the highest catalytic activity of the La 0.9 Ce 0.1 Ni 0.5 Cu 0.5 O 3 catalyst in a water gas shift reaction at 450-650°C. In the presence of H 2 S, the catalytic activity at lower temperature was suppressed due to the formation of stable SO 4 2− species on the metal. However, since the amounts of surface oxygen species and adsorbed H 2 S are much lower at high temperature, the formation of SO 4 2− species is not observed, resulting in higher catalytic activity. The presence of H 2 S at high temperature enhances the formation of formate species, which can decompose to produce methane as the side product of the water gas shift reaction. IntroductionThe Water Gas Shift (WGS) reaction is one of the key reactions for hydrogen production in industry. The reaction is favorable at a low reaction temperature due to exothermicity. However, the reaction rate is lower at lower temperatures. Hence, the WGS reaction is industrially performed in two stages, i.e. high temperature WGS at 350-450°C to increase the reaction rate using an Fe-Cr catalyst, followed by low temperature WGS at 200-250°C to convert the remaining CO in the system using a Cu-Zn catalyst. With current growing interest in hydrogen production via biomass gasification technology which produces sulfur containing syngas, it is important to develop a new catalyst having high activity and stability not only at low (200-250°C) and high temperature (350-450°C) WGS reactions but also at ultra high temperatures (500-650°C) in the presence of a wide range of sulfur concentration. It is understood that biomass gasification is usually performed at high temperatures of 700-900°C. The syngas produced from the biomass gasification has a temperature of 700°C while the conventional WGS reaction requires lower reaction temperatures (200-450°C ). Hence, the syngas needs cooling for the reaction to take place, which means energy loss. The ultra high temperature WGS reaction can minimize the energy loss due to cooling of syngas. The consequences of having a sulphur resistant WGS catalyst is that the downstream hydrogen separation process should have sulphur resistant properties as well. Hence, there is growing interest in sulphur resistant H 2 separation membranes. 1 Various types of sulfur-resistant catalysts have been reported in the literature, such as W-based catalysts, 2,3 Mobased catalysts 4-7 lanthanide oxysulfide La 2 O 2 S, 8,9 noble metal catalysts (Rh,10,(11)(12)(13)), and phosphide catalysts. 14 Sulphided CoMo catalysts in promoted and unpromoted systems have been extensively...

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Catalytic performance stability of Mo, W and Re-based sour water–gas shift catalysts

Nikolova

Edreva-Kardjieva

Gabrovska

2020

Reac Kinet Mech Cat

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Effect of tungsten deposition method on K-modified NiW/γ-Al2O3 as sulphur-tolerant water–gas shift reaction catalyst

Cited by 5 publications

References 59 publications

Effect of two-component amorphous silica-alumina (ASA) with different Si/Al molar ratios on hydrocracking reactions for increasing naphtha over NiW/USY-ASA

Effect of two-component amorphous silica-alumina (ASA) with different Si/Al molar ratios on hydrocracking reactions for increasing naphtha over NiW/USY-ASA

Sulfur resistant La_xCe_1−xNi_0.5Cu_0.5O₃ catalysts for an ultra-high temperature water gas shift reaction

Catalytic performance stability of Mo, W and Re-based sour water–gas shift catalysts

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Effect of tungsten deposition method on K-modified NiW/γ-Al2O3 as sulphur-tolerant water–gas shift reaction catalyst

Cited by 5 publications

References 59 publications

Effect of two-component amorphous silica-alumina (ASA) with different Si/Al molar ratios on hydrocracking reactions for increasing naphtha over NiW/USY-ASA

Effect of two-component amorphous silica-alumina (ASA) with different Si/Al molar ratios on hydrocracking reactions for increasing naphtha over NiW/USY-ASA

Sulfur resistant LaxCe1−xNi0.5Cu0.5O3 catalysts for an ultra-high temperature water gas shift reaction

Catalytic performance stability of Mo, W and Re-based sour water–gas shift catalysts

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Sulfur resistant La_xCe_1−xNi_0.5Cu_0.5O₃ catalysts for an ultra-high temperature water gas shift reaction