Synthesis and Catalytic Properties of Metal Clusters Encapsulated within Small-Pore (SOD, GIS, ANA) Zeolites

2012 ◽  
Vol 134 (42) ◽  
pp. 17688-17695 ◽  
Author(s):  
Sarika Goel ◽  
Zhijie Wu ◽  
Stacey I. Zones ◽  
Enrique Iglesia
Keyword(s):  
Metal Clusters ◽  
Catalytic Properties ◽  
Small Pore

scholarly journals The Preparation and Catalytic Properties of Nanoporous Pt/CeO2 Composites with Nanorod Framework Structures

Nanomaterials ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 683 ◽  
Author(s):  
Haiyang Wang ◽  
Dong Duan ◽  
Chen Ma ◽  
Wenyu Shi ◽  
Miaomiao Liang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Photoelectron Spectroscopy ◽  
Catalytic Properties ◽  
Structural Parameters ◽  
Active Oxygen Species ◽  
Pt Nanoparticles ◽  
Strong Interactions ◽  
X Ray ◽  
Small Pore ◽  
Melt Spun

Pt/CeO2 catalysts with nanoporous structures were prepared by the facile dealloying of melt-spun Al92−XCe8PtX (X = 0.1; 0.3 and 0.5) ribbons followed by calcination. The phase compositions and structural parameters of the catalysts were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and high-resolution transmission electron microscopy (HRTEM). The specific surface area and pore size distribution were characterized by N2 adsorption–desorption tests. The catalytic properties were evaluated by a three-way catalyst (TWC) measurement system. The results revealed that the dealloyed samples exhibited a nanorod framework structure. The Pt nanoparticles that formed in situ were supported and highly dispersed on the CeO2 nanorod surface and had sizes in the range of 2–5 nm. For the catalyst prepared from the melt-spun Al91.7Ce8Pt0.3 ribbons, the 50% CO conversion temperature (T50) was 91 °C, and total CO could be converted when the temperature was increased to 113 °C. An X-ray photoelectron spectroscopy (XPS) test showed that the Pt0.3/CeO2 sample had a slightly richer oxygen vacancy; and a H2 temperature-programmed reduction (H2-TPR) test demonstrated its superior adsorption ability for reduction gas and high content of active oxygen species. The experiments indicated that the catalytic performance could be retained without any attenuation after 130 h when water and CO2 were present in the reaction gas. The favorable catalytic activities were attributed to the high specific areas and small pore and Pt particle sizes as well as the strong interactions between the CeO2 and Pt nanoparticles. The Pt nanoparticles were embedded in the surface of the CeO2 nanorods, inhibiting growth. Therefore, the catalytic stability and water resistance were excellent.

Metal clusters on supports: synthesis, structure, reactivity, and catalytic properties

2010 ◽  
Vol 46 (33) ◽  
pp. 5997 ◽  
Author(s):  
Apoorva Kulkarni ◽  
Rodrigo J. Lobo-Lapidus ◽  
Bruce C. Gates
Keyword(s):  
Metal Clusters ◽  
Catalytic Properties

In situ synthesis of metal clusters encapsulated within small-pore zeolites via a dry gel conversion method

Nanoscale ◽  
2018 ◽  
Vol 10 (24) ◽  
pp. 11320-11327 ◽  
Author(s):  
Xiaoli Yang ◽  
Qinggang Liu ◽  
Yaru Zhang ◽  
Xiong Su ◽  
Yanqiang Huang ◽  
...  
Keyword(s):  
Metal Clusters ◽  
In Situ Synthesis ◽  
Dry Gel Conversion ◽  
Conversion Method ◽  
Small Pore

We report here a facile strategy for encapsulating Pt clusters into MFI crystals via a dry gel conversion (DGC) method, by introducing Pt-immobilized Schiff-SiO2 as the silicon resource.

Small-pore molecular sieves SAPO-57 and SAPO-59: synthesis, characterization, and catalytic properties in methanol-to-olefins conversion

2016 ◽  
Vol 6 (8) ◽  
pp. 2725-2734 ◽  
Author(s):  
Nak Ho Ahn ◽  
Seungwan Seo ◽  
Suk Bong Hong
Keyword(s):  
Molecular Sieves ◽  
Catalytic Properties ◽  
Synthesis And Characterization ◽  
New Members ◽  
Zeolite Structure ◽  
Small Pore

The synthesis and characterization of SAPO-57 and SAPO-59, two new members of the ABC-6 family of zeolite structure, together with their methanol-to-olefins performance, are presented.

ChemInform Abstract: Selective Synthesis of Dimethylamine Over Small-Pore Zeolites. Part 2. Effects of Impurities on Catalytic Properties of H-RHO.

ChemInform ◽  
1989 ◽  
Vol 20 (6) ◽  
Author(s):  
R. D. SHANNON ◽  
M. JUN. KEANE ◽  
L. ABRAMS ◽  
R. H. STALEY ◽  
T. E. GIER ◽  
...  
Keyword(s):  
Catalytic Properties ◽  
Selective Synthesis ◽  
Small Pore
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