The Effect of the Precipitator Concentration on the Activity of Mesoporous Cu-Ce-La Mixed Oxide Catalyst for Water-Gas Shift Catalyst

Cu-Ce-La mixed oxide catalysts were prepared by co-precipitation methods with a series of precipitator concentration and characterized using X-ray diffraction, BET, TPR, and catalytic reaction for the water-gas shift. The Cu-Ce-La mixed oxide prepared by 4.0 mol/L NaOH concentration presented the highest activity and thermal stability. the precipitator concentration influence the activity of catalyst via the stability of crystal structure and mesoporous structure. La3+or Ce4+substituted copper ion of CeO2framework during reaction process. The concentration of precipitator can control pore diameter of catalyst in synthetical process. The raising of precipitator concentration, from 0.5 to 2.0 mol/L, lead to enhancing of synergistic effects between CuO and CeO2.

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Effect of precipitator on the texture and activity of copper-manganese mixed oxide catalysts for the water gas shift reaction

Journal of Fuel Chemistry and Technology ◽

10.1016/s1872-5813(10)60038-2 ◽

2010 ◽

Vol 38 (4) ◽

pp. 445-451 ◽

Cited By ~ 10

Author(s):

Ke-duan ZHI ◽

Quan-sheng LIU ◽

Ya-gang ZHANG ◽

Shuang HE ◽

Run-xia HE

Keyword(s):

Mixed Oxide ◽

Oxide Catalysts ◽

Water Gas Shift ◽

Water Gas Shift Reaction ◽

Mixed Oxide Catalysts ◽

Copper Manganese ◽

Shift Reaction ◽

Water Gas

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Relating catalyst structure and composition to the water–gas shift activity of Cu–Zn-based mixed-oxide catalysts

Catalysis Today ◽

10.1016/j.cattod.2004.09.059 ◽

2005 ◽

Vol 100 (3-4) ◽

pp. 249-254 ◽

Cited By ~ 30

Author(s):

Magnus Rønning ◽

Florian Huber ◽

Hilde Meland ◽

Hilde Venvik ◽

De Chen ◽

...

Keyword(s):

Mixed Oxide ◽

Oxide Catalysts ◽

Water Gas Shift ◽

Catalyst Structure ◽

Mixed Oxide Catalysts ◽

Water Gas

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Effect of Alkali Precipitateing Agent on the Activity and Stability of Copper-Manganese Mixed-Oxides for the Water Gas Shift Reaction

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.634-638.508 ◽

2013 ◽

Vol 634-638 ◽

pp. 508-512

Author(s):

Ke Duan Zhi ◽

Quan Sheng Liu ◽

Run Xia He ◽

Li Yang ◽

Ya Gang Zhang ◽

...

Keyword(s):

Low Temperature ◽

Mixed Oxides ◽

Copper Ion ◽

Water Gas Shift ◽

X Ray Diffraction ◽

N2 Adsorption ◽

Wgs Reaction ◽

Texture Characteristics ◽

Shift Reaction ◽

Water Gas

This paper reports the effect of alkali precipitating agents, i.e. KOH and NaOH, on activity and stability of Cu-Mn based catalysts for the water gas shift (WGS) reaction. Structural and texture characteristics of the catalysts were characterized by low temperature N2 adsorption, X-Ray Diffraction (XRD) and TPR techniques. The XRD and low temperature N2 adsorption results showed the two types of precipitators produced different Cu-Mn phases during precipitation and drying. The KOH precipitator resulted in partial precipitation of copper ion and formation of hydrate basic copper sulfate, Cu4SO4(OH)6•H2O after drying; while the NaOH precipitator led to a completed precipitation of Cu ion and formation of relatively stable Cu2+1O and Mn3O4crystals after drying. These phases formed after precipitation by the KOH and NaOH, however, experienced the same phase change during calcination and activation, namely, they first changed to Cu1.5Mn1.5O4in calcination followed by the formation of microcrystalline Cu and MnO phases during activation. The Cu-Mn WGS catalysts prepared by the NaOH was found to have larger surface area and more content of Cu and MnO phases after activation, which might be the reasons of higher activity and better stability of the Cu-Mn catalyst.

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