On the Nature of the Catalytic Activity of Silica-Based Oxide Catalysts in the Partial Oxidation of Methane to Formaldehyde with O2

1994 ◽  
Vol 148 (2) ◽  
pp. 514-523 ◽  
Author(s):  
A. Parmaliana ◽  
V. Sokolovskii ◽  
D. Miceli ◽  
F. Arena ◽  
N. Giordano
Keyword(s):  
Catalytic Activity ◽  
Partial Oxidation ◽  
Oxide Catalysts ◽  
Partial Oxidation Of Methane ◽  
Oxidation Of Methane

scholarly journals Oscillatory Behaviour of Ni Supported on ZrO2 in the Catalytic Partial Oxidation of Methane as Determined by Activation Procedure

Materials ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2495
Author(s):  
Daniela Pietrogiacomi ◽  
Maria Cristina Campa ◽  
Ida Pettiti ◽  
Simonetta Tuti ◽  
Giulia Luccisano ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Partial Oxidation ◽  
Active Sites ◽  
Direct Reduction ◽  
Partial Oxidation Of Methane ◽  
Catalytic Partial Oxidation ◽  
Oxidation Of Methane ◽  
Short Contact Time ◽  
Oxidation Reduction ◽  
Ni Species

Ni/ZrO2 catalysts, active and selective for the catalytic partial oxidation of methane to syngas (CH4-CPO), were prepared by the dry impregnation of zirconium oxyhydroxide (Zhy) or monoclinic ZrO2 (Zm), calcination at 1173 K and activation by different procedures: oxidation-reduction (ox-red) or direct reduction (red). The characterization included XRD, FESEM, in situ FTIR and Raman spectroscopies, TPR, and specific surface area measurements. Catalytic activity experiments were carried out in a flow apparatus with a mixture of CH4:O2 = 2:1 in a short contact time. Compared to Zm, Zhy favoured the formation of smaller NiO particles, implying a higher number of Ni sites strongly interacting with the support. In all the activated Ni/ZrO2 catalysts, the Ni–ZrO2 interaction was strong enough to limit Ni aggregation during the catalytic runs. The catalytic activity depended on the activation procedures; the ox-red treatment yielded very active and stable catalysts, whereas the red treatment yielded catalysts with oscillating activity, ascribed to the formation of Niδ+ carbide-like species. The results suggested that Ni dispersion was not the main factor affecting the activity, and that active sites for CH4-CPO could be Ni species at the boundary of the metal particles in a specific configuration and nuclearity.

On the nature of active sites of silica based oxide catalysts in the partial oxidation of methane to formaldehyde

1995 ◽  
Vol 24 (3) ◽  
pp. 231-236 ◽  
Author(s):  
A. Parmaliana ◽  
F. Arena ◽  
F. Frusteri ◽  
D. Miceli ◽  
V. Sokolovskii
Keyword(s):  
Partial Oxidation ◽  
Active Sites ◽  
Oxide Catalysts ◽  
Partial Oxidation Of Methane ◽  
Oxidation Of Methane
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