scholarly journals Dehydrogenation of Cyclohexane on Alumina-Supported Rhodium Catalysts. Effect of Oxidation-Reduction Treatment on the Catalytic Activity

1987 ◽  
Vol 16 (1) ◽  
pp. 165-166
Author(s):  
Akira Maeda ◽  
Kimio Kunimori ◽  
Toshio Uchijima
Keyword(s):  
Catalytic Activity ◽  
Rhodium Catalysts ◽  
Reduction Treatment ◽  
Oxidation Reduction ◽  
Dehydrogenation Of Cyclohexane

scholarly journals Catalytic Activity of Oxidation-Reduction Pre-Treated Ni3Al for Methane Steam Reforming

2010 ◽  
Vol 89-91 ◽  
pp. 645-650 ◽  
Author(s):  
Ya Xu ◽  
Dong Hyun Chun ◽  
Jun Hyuk Jang ◽  
Masahiko Demura ◽  
Dang Moon Wee ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Steam Reforming ◽  
Active Surface ◽  
Methane Steam Reforming ◽  
Reduction Treatment ◽  
Highly Active ◽  
Methane Steam ◽  
Oxidation Reduction ◽  
Pre Treatment ◽  
Oxidation In Air

The catalytic activity of oxidation-reduction pre-treated Ni3Al powder for methane steam reforming was examined. The oxidation-reduction pre-treatment consisted of two steps: oxidation in air at various temperatures from 973 to 1373 K, and then followed by reduction in H2 at 873 K. It was found that the oxidation-reduction treatments significantly reduced the onset temperature of activity, i.e., improved the activity of Ni3Al powder at low temperatures. The characterization of Ni3Al surface showed that an outer surface layer of fine NiO particles were formed on the surface of Ni3Al after oxidation. These NiO particles were reduced to metallic Ni by the subsequent reduction treatment, resulting in the high activity for methane steam reforming. These results indicate that the Ni3Al can form highly active surface structure with oxidation-reduction treatment, having excellent heat resistance.

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.

Supported Rhodium Catalysts for Ammonia-Borane Hydrolysis: Dependence of the Catalytic Activity on the Highest Occupied State of the Single Rhodium Atoms

2017 ◽  
Vol 129 (17) ◽  
pp. 4790-4796 ◽  
Author(s):  
Liangbing Wang ◽  
Hongliang Li ◽  
Wenbo Zhang ◽  
Xiao Zhao ◽  
Jianxiang Qiu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Ammonia Borane ◽  
Rhodium Catalysts ◽  
Occupied State

Influence of oxidation–reduction treatment on the microstructure of Co/SiO2 catalyst

1998 ◽  
Vol 175 (1-2) ◽  
pp. 113-120 ◽  
Author(s):  
D. Potoczna-Petru ◽  
J.M. Jabłoński ◽  
J. Okal ◽  
L. Krajczyk
Keyword(s):  
Reduction Treatment ◽  
Oxidation Reduction
Sign in / Sign up

Export Citation Format

Share Document