Thermally stable core–shell Ni/nanorod-CeO2@SiO2 catalyst for partial oxidation of methane at high temperatures

Nanoscale ◽  
2018 ◽  
Vol 10 (29) ◽  
pp. 14031-14038 ◽  
Author(s):  
Shaohong Zhu ◽  
Xinyi Lian ◽  
Tingting Fan ◽  
Zhou Chen ◽  
Yunyun Dong ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Catalytic Activity ◽  
High Temperatures ◽  
Partial Oxidation ◽  
Partial Oxidation Of Methane ◽  
Core Shell ◽  
High Catalytic Activity ◽  
Good Thermal Stability ◽  
Oxidation Of Methane ◽  
Stable Core

Core–shell Ni/nanorod-CeO2@SiO2 catalyst prepared by a microemulsion method shows high catalytic activity and good thermal stability for the partial oxidation of methane.

Thermally stable sandwich-type catalysts of Pt nanoparticles encapsulated in CeO2 nanorod/CeO2 nanoparticle core/shell supports for methane oxidation at high temperatures

RSC Advances ◽  
2016 ◽  
Vol 6 (46) ◽  
pp. 40323-40329 ◽  
Author(s):  
Zhiyun Zhang ◽  
Jing Li ◽  
Wei Gao ◽  
Zhaoming Xia ◽  
Yuanbin Qin ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Catalytic Activity ◽  
Methane Oxidation ◽  
High Temperatures ◽  
Pt Nanoparticles ◽  
Core Shell ◽  
High Catalytic Activity ◽  
Thermally Stable ◽  
Sandwich Type ◽  
Nanoparticle Core

A sandwich-type Pt nanocatalyst encapsulated ceria-based core–shell catalyst (CNR@Pt@CNP) was designed and synthesized, which exhibited high catalytic activity and remarkably thermal-stability at high temperatures up to 700 °C.

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.

Highly Active and Stable Lanthanum-doped Core-Shell-structured Ni@SiO2Catalysts for the Partial Oxidation of Methane to Syngas

ChemCatChem ◽  
2013 ◽  
Vol 5 (12) ◽  
pp. 3781-3787 ◽  
Author(s):  
Lei Li ◽  
Yao Yao ◽  
Bo Sun ◽  
Zhaoyang Fei ◽  
Hao Xia ◽  
...  
Keyword(s):  
Partial Oxidation ◽  
Partial Oxidation Of Methane ◽  
Core Shell ◽  
Oxidation Of Methane ◽  
Highly Active

scholarly journals Studies of Nickel/Samarium-Doped Ceria for Catalytic Partial Oxidation of Methane and Effect of Oxygen Vacancy

Catalysts ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 731
Author(s):  
Andrew C. Chien ◽  
Nicole J. Ye ◽  
Chao-Wei Huang ◽  
I-Hsiang Tseng
Keyword(s):  
Catalytic Activity ◽  
Partial Oxidation ◽  
Partial Oxidation Of Methane ◽  
Catalytic Partial Oxidation ◽  
Doped Ceria ◽  
Syngas Production ◽  
Oxidation Of Methane ◽  
Metal Support Interaction ◽  
Metal Support ◽  
Temperature Programmed

We investigated the performance of nickel/samarium-doped ceria (Ni/SDC) nanocatalysts on the catalytic partial oxidation of methane (CPOM). Studies of temperature-programmed surface reaction and reduction reveal that catalytic activity is determined by a synergistic effect produced by Ni metals and metal-support interaction. Catalytic activity was more dependent on the Ni content below 600 °C, while there is not much difference for all catalysts at high temperatures. The catalyst exhibiting high activities toward syngas production (i.e., a CH4 conversion >90% at 700 °C) requires a medium Ni-SDC interaction with an Sm/Ce ratio of about 1/9 to 2/8. This is accounted for by optimum oxygen vacancies and adequate ion diffusivity in the SDCs which, as reported, also display the highest ion conductivity for fuel cell applications.

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