Thermally stable and highly active Pt/CeO2@SiO2 catalysts with a porous/hollow structure

2018 ◽  
Vol 8 (17) ◽  
pp. 4413-4419 ◽  
Author(s):  
Guozhu Chen ◽  
Ying Yang ◽  
Zeyi Guo ◽  
Daowei Gao ◽  
Wei Zhao ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Catalytic Activity ◽  
Hollow Structure ◽  
Selective Etching ◽  
Thermally Stable ◽  
Highly Active

One robust selective-etching approach is used to encapsulate Pt/CeO2 composites into SiO2 with a porous/hollow structure for enhanced thermal stability and catalytic activity.

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 A highly active and thermally stable 6,13-dihydro-6,13-ethanopentacene-15,16-diimine nickel(ii) complex as catalyst for norbornene polymerization

RSC Advances ◽  
2017 ◽  
Vol 7 (82) ◽  
pp. 51858-51863 ◽  
Author(s):  
Ping Huo ◽  
Jingbo Li ◽  
Wanyun Liu ◽  
Guangquan Mei ◽  
Xiaohui He
Keyword(s):  
Thermal Stability ◽  
High Activity ◽  
Nickel Catalyst ◽  
Thermally Stable ◽  
Good Thermal Stability ◽  
Highly Active ◽  
Polycyclic Aromatic ◽  
Aromatic Systems ◽  
Norbornene Polymerization

A nickel catalyst with polycyclic aromatic systems on the backbone exhibits good thermal stability and high activity in norbornene copolymerization.

Synthesis of mesoporous iridium nanosponge: a highly active, thermally stable and efficient olefin hydrogenation catalyst

2017 ◽  
Vol 46 (34) ◽  
pp. 11431-11439 ◽  
Author(s):  
Sourav Ghosh ◽  
Balaji R. Jagirdar
Keyword(s):  
Catalytic Activity ◽  
Hydrogenation Catalyst ◽  
High Catalytic Activity ◽  
Capping Agent ◽  
Thermally Stable ◽  
Olefin Hydrogenation ◽  
Highly Active

Capping agent dissolution of Ir@BNHx nanocomposite affords mesoporous iridium nanosponge which exhibits high catalytic activity towards olefin hydrogenation of a variety of substrates.

scholarly journals Preparation of high oxygen storage capacity and thermally stable ceria–zirconia solid solution

2016 ◽  
Vol 6 (3) ◽  
pp. 897-907 ◽  
Author(s):  
Jie Li ◽  
Xiaofei Liu ◽  
Wangcheng Zhan ◽  
Yun Guo ◽  
Yanglong Guo ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Solid Solution ◽  
Catalytic Activity ◽  
Storage Capacity ◽  
Oxygen Storage Capacity ◽  
High Oxygen ◽  
Coprecipitation Method ◽  
Oxygen Storage ◽  
Thermally Stable ◽  
High Oxygen Storage Capacity

Ce0.5Zr0.5O2 prepared by the complexing–coprecipitation method (CZ-2) exhibits higher oxygen storage capacity (OSC) and thermal stability than that prepared by coprecipitation (CZ-1) or the complexing–coprecipitation-solution (CZ-3) method. After being aged at 1100 °C for 6 h, CZ-2a exhibited the highest OSC and catalytic activity.

Deactivation of arenetitanium(II) bromoalane complexes in the cyclotrimerization of butadiene

1986 ◽  
Vol 51 (12) ◽  
pp. 2751-2759 ◽  
Author(s):  
Jindřich Poláček ◽  
Helena Antropiusová ◽  
Lidmila Petrusová ◽  
Karel Mach
Keyword(s):  
Catalytic Activity ◽  
Catalytic System ◽  
Model System ◽  
Highly Active ◽  
Catalytic Stability

The C6H6.Ti(II)(AlBr4)2 (Ib) catalyst deactivates during the butadiene cyclotrimerization to give a solid containing all titanium (mostly as TiBr3) and a mixture of AlBr3 and RAlBr2 compounds dissolved in benzene. The residual cationic catalytic activity of the deactivated Ib system is due to presence of AlBr3. In contrast to TiCl3, the deactivated Ib system and the model system TiBr3 + AlBr3 are not activated by the addition of EtAlCl2 in the presence of butadiene: the highly active benzenetitanium(II) system is re-constituted only after reduction of TiBr3 with Et3Al followed by the addition of EtAlCl2. The addition of Et2AlBr to Ib accelerates the deactivation of the system. Deactivation products of this system contain mainly Ti(II) species which forms benzenetitanium(II) catalytic system after addition of EtAlCl2. All the EtAlCl2 reactivated systems produce (Z, E, E)-1,5,9-cyclododecatriene with high catalytic stability and considerable selectivity (>90%). This behaviour points to the catalysis by benzenetitanium(II) chloroalane complexes containing only low amount of bromine atoms and ethyl groups.

scholarly journals Highly Dispersed Pd Species Supported on CeO2 Catalyst for Lean Methane Combustion: The Effect of the Occurrence State of Surface Pd Species on the Catalytic Activity

Catalysts ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 772
Author(s):  
Yanxiong Liu ◽  
Changhua Hu ◽  
Longchun Bian
Keyword(s):  
Catalytic Activity ◽  
Oxygen Vacancies ◽  
Methane Combustion ◽  
Pd Nanoparticles ◽  
High Concentration ◽  
Ch4 Combustion ◽  
Highly Active ◽  
Δ Phase ◽  
Occurrence State ◽  
Comprehensive Characterization

The correlation between the occurrence state of surface Pd species of Pd/CeO2 for lean CH4 combustion is investigated. Herein, by using a reduction-deposition method, we have synthesized a highly active 0.5% PdO/CeO2-RE catalyst, in which the Pd nanoparticles are evenly dispersed on the CeO2 nanorods CeO2-R. Based on comprehensive characterization, we have revealed that the uniformly dispersed Pd nanoparticles with a particle size distribution of 2.3 ± 0.6 nm are responsible for the generation of PdO and PdxCe1−xO2−δ phase with –Pd2+–O2−–Ce4+– linkage, which can easily provide oxygen vacancies and facilitate the transfer of reactive oxygen species between the CeO2-R and Pd species. As a consequence, the remarkable catalytic activity of 0.5% Pd/CeO2-RE is related to the high concentration of PdO species on the surface of the catalyst and the synergistic interaction between the Pd species and the CeO2 nanorod.

scholarly journals A new highly active La2O3–CuO–MgO catalyst for the synthesis of cumyl peroxide by catalytic oxidation

RSC Advances ◽  
2021 ◽  
Vol 11 (21) ◽  
pp. 12532-12542
Author(s):  
HanShuang Liu ◽  
KaiJun Wang ◽  
XiaoYan Cao ◽  
JiaXin Su ◽  
Zhenggui Gu
Keyword(s):  
Catalytic Activity ◽  
Catalytic Oxidation ◽  
Highly Active

The La2O3–CuO–MgO catalyst acts on the oxidation of cumene and shows excellent catalytic activity through the coordination of surface and interior.

Catalytic activity of niobium oxynitride and carbide I. Preparation, characterization and thermal stability of finely divided niobium oxynitrides

1994 ◽  
Vol 119 (2) ◽  
pp. 223-240 ◽  
Author(s):  
Hak Soo Kim ◽  
Chae Ho Shin ◽  
Guy Bugli ◽  
Monique Bureau-Tardy ◽  
Gerald Djega-Mariadassou
Keyword(s):  
Thermal Stability ◽  
Catalytic Activity ◽  
Thermal Stability Of

scholarly journals Synthesis of Thermally Stable and Highly Active Bimetallic Au−Ag Nanoparticles on Inert Supports

2009 ◽  
Vol 21 (2) ◽  
pp. 410-418 ◽  
Author(s):  
Xiaoyan Liu ◽  
Aiqin Wang ◽  
Xiaofeng Yang ◽  
Tao Zhang ◽  
Chung-Yuan Mou ◽  
...  
Keyword(s):  
Ag Nanoparticles ◽  
Thermally Stable ◽  
Highly Active

scholarly journals Nef Associates with p21-Activated Kinase 2 in a p21-GTPase-Dependent Dynamic Activation Complex within Lipid Rafts

2004 ◽  
Vol 78 (23) ◽  
pp. 12773-12780 ◽  
Author(s):  
Kati Pulkkinen ◽  
G. Herma Renkema ◽  
Frank Kirchhoff ◽  
Kalle Saksela
Keyword(s):  
Catalytic Activity ◽  
Lipid Rafts ◽  
Lipid Raft ◽  
Kinase Activity ◽  
Highly Active ◽  
Membrane Compartment ◽  
Per Se ◽  
P21 Activated Kinase ◽  
Autoregulatory Mechanism ◽  
Pak2 Activation

ABSTRACT We have previously reported that Nef specifically interacts with a small but highly active subpopulation of p21-activated kinase 2 (PAK2). Here we show that this is due to a transient association of Nef with a PAK2 activation complex within a detergent-insoluble membrane compartment containing the lipid raft marker GM1. The low abundance of this Nef-associated kinase (NAK) complex was found to be due to an autoregulatory mechanism. Although activation of PAK2 was required for assembly of the NAK complex, catalytic activity of PAK2 also promoted dissociation of this complex. Testing different constitutively active PAK2 mutants indicated that the conformation associated with p21-mediated activation rather than kinase activity per se was required for PAK2 to become NAK. Although association with PAK2 is one of the most conserved properties of Nef, we found that the ability to stimulate PAK2 activity differed markedly among divergent Nef alleles, suggesting that PAK2 association and activation are distinct functions of Nef. However, mutations introduced into the p21-binding domain of PAK2 revealed that p21-GTPases are involved in both of these Nef functions and, in addition to promoting PAK2 activation, also help to physically stabilize the NAK complex.

Sign in / Sign up

Export Citation Format

Share Document