Water–gas shift reaction over sulfided molybdenum catalysts

Laniecki, M.; Małecka-Grycz, M; Domka, F.

doi:10.1016/s0926-860x(99)00480-9

Cited by 87 publications

(33 citation statements)

References 28 publications

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“…The solubility of MoO 3 is low but sufficient for the gradual dissolution and adsorption of Mo species on the support surface. The pH of MoO 3 /H 2 O (2-2.8) is lower than the point of zero charge of alumina (6)(7)(8) and of active carbon (7)(8). The support surface is positively charged and this promotes adsorption of molybdenum-containing anions.…”

Section: Introductionmentioning

confidence: 99%

“…Catalysts based on MoO 3 /TiO 2 are active in various reactions of industrial importance such as hydrodesulfurization [1][2][3], partial oxidation of methanol [4], vapour-phase ammoxidation of toluene [5], the watergas shift reaction [6], epoxidation of allylacetate with 3-butyl hydroperoxide [7], oxidation of 1-butene and butadiene [8] and selective catalytic reduction of NO x by NH 3 [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

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Preparation of MoO3/TiO2 Catalysts with Eggshell and Uniform Mo Distribution by Water-Assisted Spreading of MoO3

et al. 2006

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MoO 3 /TiO 2 catalysts were prepared by reaction of TiO 2 extrudates (140 m 2 g )1 ) with a MoO 3 /H 2 O slurry. The adsorption of molybdena species was strong; sharp, deep eggshell profiles of the Mo concentration were obtained. The hydrodesulfurization activity of saturated catalysts with a uniform Mo distribution (about 10 wt.% MoO 3 ) was at least the same as that of a sample prepared by conventional impregnation.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Preparation of MoO3/TiO2 Catalysts with Eggshell and Uniform Mo Distribution by Water-Assisted Spreading of MoO3

et al. 2006

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“…These species may be used in several processes such as hydrodesulfurization, [1,2] the hydrogenation of aromatics, [3] oxidation, [4] hydrodechlorination, [5,6] the water-gas shift reaction, [7] catalytic reforming of methane, [8] methane decomposition, [9] steam reforming, [10,11] and the tri-reforming of methane. [12] Owing to their importance, the above catalysts have been characterized by various techniques.…”

Section: Introductionmentioning

confidence: 99%

Interfacial Impregnation Chemistry in the Synthesis of Nickel Catalysts Supported on Titania

Bourikas

Stavropoulos

Garoufalis

et al. 2010

Chemistry A European J

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The interfacial chemistry of the impregnation step involved in the preparation of nickel catalysts supported on titania is presented. Several methodologies based on deposition data, pH measurements, potentiometric mass titrations, and microelectrophoresis have been used in conjunction with diffuse reflectance UV/Vis/NIR spectroscopy, simulations, and semiempirical quantum chemical calculations. Three mononuclear inner-sphere complexes were formed at the compact layer of the "titania/electrolyte solution" interface: A monosubstituted, dihydrolyzed complex above a terminal oxo group, a disubstituted, dihydrolyzed complex above two terminal adjacent oxo groups, and a disubstituted, nonhydrolyzed complex above one terminal and one bridging adjacent oxo groups. The monosubstituted, dihydrolyzed complex predominates. The contribution of the disubstituted configurations is also important at very low Ni(II) surface concentration, but it decreases as the Ni(II) surface concentration increases. In addition, bi- and trinuclear inner-sphere complexes were formed. The receptor site involves one bridging and two terminal oxo groups in the first case and two bridging and three terminal oxo groups in the second case. The relative surface concentrations of these configurations increase initially with Ni(II) surface concentration and then remain practically constant. The understanding of these interfacial processes at a molecular level is very important to shift the catalytic synthesis from an art to a science as well as to obtain strict control of the impregnation step and, to some extent, of the whole preparative sequence. This study is very relevant to the synthesis of submonolayer/monolayer nickel catalysts supported on TiO(2) following equilibrium deposition filtration (otherwise called equilibrium adsorption).

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“…Recently, a new type of sulfur-tolerant WGSR catalysts, i.e., supported sulfided Mo-based catalysts, has been specifically designed for high sulfur-containing feedstock [1,[8][9][10][11][12][13][14][15][16][17][18][19]. Łaniecki et al [13,16,18] investigated the Y-type zeolite, alumina, titania, zirconia, and TiO 2 -ZrO 2 mixed oxides-supported molybdenum sulfide catalysts for the WGSR.…”

Section: Introductionmentioning

confidence: 99%

“…Łaniecki et al [13,16,18] investigated the Y-type zeolite, alumina, titania, zirconia, and TiO 2 -ZrO 2 mixed oxides-supported molybdenum sulfide catalysts for the WGSR. It is well known that alkali and Groups VIII metal additives enhance the activities of the Mo-based WGSR catalysts [1,9,19].…”

Section: Introductionmentioning

confidence: 99%

MgO–Al2O3 Mixed Oxides-Supported Co–Mo-Based Catalysts for High-Temperature Water–Gas Shift Reaction

et al. 2008

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MgO-Al 2 O 3 mixed oxides were prepared and used as the support of Co-Mo-based water-gas shift reaction (WGSR) catalysts. X-ray diffraction (XRD) characterization showed that the MgO-Al 2 O 3 mixed oxides support is composed of MgO, c-Al 2 O 3 , and magnesiaalumina spinel. The MgO-Al 2 O 3 mixed oxides-supported Co-Mo-based catalysts exhibited high shift activity at high temperature (360-450°C) and high stability. The addition of potassium enhanced the activities but affected adversely the stabilities of Co-Mo-based catalysts. ESR characterization shows that the Mo 5+ species are not connected with the WGSR activity. Magnesium in the support may be closely related with the formation of formate species intermediate for the WGSR.

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Water–gas shift reaction over sulfided molybdenum catalysts

Cited by 87 publications

References 28 publications

Preparation of MoO3/TiO2 Catalysts with Eggshell and Uniform Mo Distribution by Water-Assisted Spreading of MoO3

Preparation of MoO3/TiO2 Catalysts with Eggshell and Uniform Mo Distribution by Water-Assisted Spreading of MoO3

Interfacial Impregnation Chemistry in the Synthesis of Nickel Catalysts Supported on Titania

MgO–Al2O3 Mixed Oxides-Supported Co–Mo-Based Catalysts for High-Temperature Water–Gas Shift Reaction

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