scholarly journals The influence of porosity on nanoparticle formation in hierarchical aluminophosphates

2019 ◽  
Vol 10 ◽  
pp. 1952-1957 ◽  
Author(s):  
Matthew E Potter ◽  
Lauren N Riley ◽  
Alice E Oakley ◽  
Panashe M Mhembere ◽  
June Callison ◽  
...  
Keyword(s):  
Catalytic Oxidation ◽  
Active Sites ◽  
Dual Porosity ◽  
Hierarchical Systems ◽  
Nanoparticle Deposition ◽  
Gold Particles ◽  
Nanoparticle Formation ◽  
Significant Potential ◽  
Oxidation Reduction ◽  
Deposition Techniques

In this work we explore the deposition of gold onto a silicoaluminophosphate, using a variety of known nanoparticle deposition techniques. By comparing the gold particles deposited on a traditional microporous aluminophosphate, with an analogous hierarchical species, containing both micropores and mesopores, we explore the influence of this dual porosity on nanoparticle deposition. We show that the presence of mesopores has limited influence on the nanoparticle properties, but allows the system to maintain porosity after nanoparticle deposition. This will aid diffusion of reagents through the system, allowing continued access to the active sites in hierarchical systems, which offers significant potential in catalytic oxidation/reduction reactions.

scholarly journals The influence of porosity on nanoparticle formation in hierarchical aluminophosphates

2019 ◽  
Author(s):  
Matthew E Potter ◽  
Lauren N Riley ◽  
Alice E Oakley ◽  
Panashe M Mhembere ◽  
June Callison ◽  
...  
Keyword(s):  
Active Sites ◽  
Oxidation Reactions ◽  
Hierarchical Systems ◽  
Key Factors ◽  
Nanoparticle Deposition ◽  
Diverse Range ◽  
Metal Support ◽  
Nanoparticle Design ◽  
Silicon Doped ◽  
Deposition Techniques

The ability to tailor metal active sites is increasingly important, due to the superior advantages in nanoparticle utilisation in a diverse range of fields. One of the key factors that determines the properties of immobilised nanoparticles is metal-support interactions, thus the nature of the support is crucial for optimising nanoparticle design for a range of catalytic applications. In this work we explore the deposition of gold onto a silicon-doped aluminophosphate, using a variety of known nanoparticle deposition techniques. By comparing the gold particles deposited on a traditional microporous aluminophosphate, with an analogous hierarchical species, containing both micropores and mesopores, we explore the influence of this dual porosity on nanoparticle deposition. We show that the presence of mesopores has limited influence on the nanoparticles properties, but allows the system to maintain porosity post-deposition. This will aid diffusion of reagents through the system, allowing continued access the active sites in hierarchical systems, which offers significant potential in catalytic oxidation reactions.

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.

scholarly journals Identification of Active Sites in the Catalytic Oxidation of 2‐Propanol over Co1+xFe2‐xO4 Spinel Oxides at Solid/Liquid and Solid/Gas Interfaces

ChemCatChem ◽  
2021 ◽  
Author(s):  
Tobias Falk ◽  
Eko Budiyanto ◽  
Maik Dreyer ◽  
Christin Pflieger ◽  
Daniel Waffel ◽  
...  
Keyword(s):  
Catalytic Oxidation ◽  
Active Sites ◽  
Spinel Oxides ◽  
Solid Liquid

Coupled Catalytic Oxidation–Reduction and Hydrolysis with Ce1Mn2 Catalysts for HCN and NO Removal

2020 ◽  
Vol 34 (7) ◽  
pp. 8543-8551
Author(s):  
Xueqian Wang ◽  
Ruonan Sun ◽  
Langlang Wang ◽  
Yibing Xie ◽  
Lei Tao ◽  
...  
Keyword(s):  
Catalytic Oxidation ◽  
No Removal ◽  
Oxidation Reduction

Synthesis of Porous α-Fe2O3Nanorods and Deposition of Very Small Gold Particles in the Pores for Catalytic Oxidation of CO

2007 ◽  
Vol 19 (19) ◽  
pp. 4776-4782 ◽  
Author(s):  
Ziyi Zhong ◽  
Judith Ho ◽  
Jaclyn Teo ◽  
Shoucang Shen ◽  
Aharon Gedanken
Keyword(s):  
Catalytic Oxidation ◽  
Oxidation Of Co ◽  
Gold Particles ◽  
Catalytic Oxidation Of Co

Comparison of Mixing Approaches in the Synthesis and Deposition of Ceria Nanoparticles

2007 ◽  
Author(s):  
Chih Heng T. Tseng ◽  
Brian K. Paul
Keyword(s):  
Thin Film ◽  
Spin Coating ◽  
Thin Film Deposition ◽  
Film Deposition ◽  
Film Morphology ◽  
Ceria Nanoparticles ◽  
Microchannel Reactor ◽  
Nanoparticle Deposition ◽  
Nanoparticle Shape ◽  
Deposition Techniques

Nanoparticle deposition techniques hold the promise of simplifying thin film deposition while enabling enhanced performance through the control of film density, porosity and composition. In this paper, ceria nanoparticles are deposited from solution to a film via spin coating. A comparison is made between the nanoparticle shape and film morphology produced by depositing from different mixing approaches. In this paper, different mixing approaches were carried out by using traditional batch precipitation reactor and continuous microchannel reactor (T-mixer). Preliminary results show different particle shape and film morphology as a function of precursor concentration. Advantages of the microchannel approach include better control of nanoparticle shape and more uniform film with less agglomeration.

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