Glycerol steam reforming over Ru-Mg-Al hydrotalcite-derived mixed oxides: Role of the preparation method in catalytic activity

Considerable efforts to reduce the harmful emissions of volatile organic compounds (VOCs) have been directed towards the development of highly active and economically viable catalytic materials for complete hydrocarbon oxidation. The present study is focused on the complete benzene oxidation as a probe reaction for VOCs abatement over Co3O4-CeO2 mixed oxides (20, 30, and 40 wt.% of ceria) synthesized by the more sustainable, in terms of less waste, less energy and less hazard, mechanochemical mixing of cerium hydroxide and cobalt hydroxycarbonate precursors. The catalysts were characterized by BET, powder XRD, H2-TPR, UV resonance Raman spectroscopy, and XPS techniques. The mixed oxides exhibited superior catalytic activity in comparison with Co3O4, thus, confirming the promotional role of ceria. The close interaction between Co3O4 and CeO2 phases, induced by mechanochemical treatment, led to strained Co3O4 and CeO2 surface structures. The most significant surface defectiveness was attained for 70 wt.% Co3O4-30 wt.% CeO2. A trend of the highest surface amount of Co3+, Ce3+ and adsorbed oxygen species was evidenced for the sample with this optimal composition. The catalyst exhibited the best performance and 100% benzene conversion was reached at 200 °C (relatively low temperature for noble metal-free oxide catalysts). The catalytic activity at 200 °C was stable without any products of incomplete benzene oxidation. The results showed promising catalytic properties for effective VOCs elimination over low-cost Co3O4-CeO2 mixed oxides synthesized by simple and eco-friendly mechanochemical mixing.

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Effect of preparation method of mesoporous Ni–Al2O3 catalysts on their catalytic activity for hydrogen production by steam reforming of liquefied natural gas (LNG)

International Journal of Hydrogen Energy ◽

10.1016/j.ijhydene.2009.05.042 ◽

2009 ◽

Vol 34 (13) ◽

pp. 5409-5416 ◽

Cited By ~ 23

Author(s):

Jeong Gil Seo ◽

Min Hye Youn ◽

Ji Chul Jung ◽

In Kyu Song

Keyword(s):

Catalytic Activity ◽

Hydrogen Production ◽

Natural Gas ◽

Steam Reforming ◽

Preparation Method ◽

Liquefied Natural Gas

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Hydrogen Production by Steam Reforming of Methanol over a Ag/ZnO One Dimensional Catalyst

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.132.205 ◽

2010 ◽

Vol 132 ◽

pp. 205-219 ◽

Cited By ~ 19

Author(s):

Raul Pérez-Hernández ◽

A. Gutiérrez-Martínez ◽

Alvaro Mayoral ◽

F. Leonard Deepak ◽

Ma. E. Fernández-García ◽

...

Keyword(s):

Particle Size ◽

Catalytic Activity ◽

Steam Reforming ◽

Three Dimensional ◽

Methanol Conversion ◽

H2 Production ◽

One Dimensional ◽

Steam Reforming Of Methanol ◽

Ag Particle

One dimensional (1-D) and three dimensional (3-D) ZnO were growth by a hydrothermal method. ZnO 1-D was employed as a support for silver nanoparticles in order to design a new catalyst and used on the steam reforming of methanol (SRM) reaction for H2 production. The catalytic activity of the Ag/ZnO sample with low content of Ag showed better performance on the SRM reaction than on high silver loading catalyst. So, the sample with small Ag particle size showed best performance in methanol conversion than catalyst with big Ag particle size, this finding could be attributed to the high ZnO/Ag ratio. According to results of SEM and TEM techniques the catalytic activity: methanol conversion, H2 and low CO production observed on the Ag/ZnO 1-D catalyst occurs in the edge sites rather than the rim sites. The role of Ag is to accept the hydrogen to be released to the gas phase. In addition, the 1.5Ag/ZnO 1-D catalyst showed good stability during the reaction.

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