Evaluation of hydrothermal stability of encapsulated PdPt@SiO2 catalyst for lean CH4 combustion

2018 ◽  
Vol 556 ◽  
pp. 129-136 ◽  
Author(s):  
Amir H. Habibi ◽  
Robert E. Hayes ◽  
Natalia Semagina
Keyword(s):  
Hydrothermal Stability ◽  
Ch4 Combustion

scholarly journals The Hydrothermal Stability and the Properties of Non- and Strongly-Interacting Rh Species over Rh/γ, θ-Al2O3 Catalysts

Catalysts ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 99
Author(s):  
Guanghao Cheng ◽  
Gurong Shen ◽  
Jun Wang ◽  
Yunhao Wang ◽  
Weibo Zhang ◽  
...  
Keyword(s):  
Activation Energy ◽  
Apparent Activation Energy ◽  
Aging Time ◽  
Reaction Path ◽  
Aging Treatment ◽  
Hydrothermal Stability ◽  
Hydrothermal Aging ◽  
Strongly Interacting

The present work reports the effects of γ-, θ-phase of alumina on the hydrothermal stability and the properties of non- and strongly-interacting Rh species of the Rh/Al2O3 catalysts. Comparing to γ-Al2O3, θ-Al2O3 can not only reduce the amount of occluded Rh but also better stabilize Rh during hydrothermal aging treatment. When the aging time was prolonged to 70 h, all the non-interacting Rh was transformed into strongly-interacting Rh and occluded Rh. The XPS results indicated that non- and strongly-interacting Rh might exist in the form of Rh/Rh3+ and Rh4+, respectively. CO-NO reaction was chosen as a probe reaction to research more information about non- and strongly-interacting Rh. The two Rh species had similar apparent activation energy (Eapp) of 170 kJ/mol, which indicated that non- and strongly-interacting Rh follow the same reaction path. The non-interacting Rh was removed from aged samples by the acid-treated method, and obtained results showed that only 2.5% and 4.0% non-interacting Rh was maintained in aged Rh/γ-Al2O3 and Rh/θ-Al2O3.

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 Enhancement of Hydrothermal Stability and CO2 Adsorption of Mg-MOF-74/MCF Composites

ACS Omega ◽  
2021 ◽  
Vol 6 (11) ◽  
pp. 7739-7745
Author(s):  
Chunling Xin ◽  
Yang Ren ◽  
Zhaofei Zhang ◽  
Lili Liu ◽  
Xia Wang ◽  
...  
Keyword(s):  
Co2 Adsorption ◽  
Hydrothermal Stability

Nature of cerium on improving low-temperature hydrothermal stability of SAPO-34

2020 ◽  
Author(s):  
Qingyun Wang ◽  
Meiqing Shen ◽  
Jianqiang Wang ◽  
Chen Wang ◽  
Jun Wang
Keyword(s):  
Low Temperature ◽  
Hydrothermal Stability

Mesoporous CeO2-ZrO2-γ-Al2O3nanocomposite membranes exhibiting remarkable hydrothermal stability

2009 ◽  
Vol 2 (1-3) ◽  
pp. 229-236 ◽  
Author(s):  
Md. Hasan Zahir ◽  
Shinji Fujisaki ◽  
Koji Sato ◽  
Takayuki Nagano ◽  
Yuji Iwamoto
Keyword(s):  
Hydrothermal Stability ◽  
Mesoporous Ceo2

Transition metals increase hydrothermal stability of yttria-tetragonal zirconia polycrystals (3Y-TZP)

2018 ◽  
Vol 38 (10) ◽  
pp. 3573-3577 ◽  
Author(s):  
Wenliang Zhu ◽  
Aiko Fujiwara ◽  
Naomichi Nishiike ◽  
Elia Marin ◽  
Nobuhiko Sugano ◽  
...  
Keyword(s):  
Transition Metals ◽  
Tetragonal Zirconia ◽  
Hydrothermal Stability

Hydrothermal stability of cobalt silica membranes in a water gas shift membrane reactor

2009 ◽  
Vol 66 (2) ◽  
pp. 299-305 ◽  
Author(s):  
Scott Battersby ◽  
Simon Smart ◽  
Bradley Ladewig ◽  
Shaomin Liu ◽  
Mikel C. Duke ◽  
...  
Keyword(s):  
Membrane Reactor ◽  
Hydrothermal Stability ◽  
Water Gas Shift ◽  
Silica Membranes ◽  
Water Gas
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