Investigation of the re-dispersion of matrix Cu species in CuxCe1−xO2 nanorod catalysts and its effect on the catalytic performance in CO-PROX

2020 ◽  
Vol 10 (14) ◽  
pp. 4766-4775
Author(s):  
Xiaolin Guo ◽  
Wangxiang Ye ◽  
Tingli Ma
Keyword(s):  
Thermal Treatment ◽  
Catalytic Performance ◽  
Copper Species ◽  
Highly Dispersed ◽  
Dispersion State

The CO-PROX catalytic performance is sensitive to the re-dispersion state of matrix copper species, which separate out as highly dispersed CuOx under thermal treatment.

scholarly journals Hydrogenative Ring-Rearrangement of Furfural to Cyclopentanone over Pd/UiO-66-NO2 with Tunable Missing-Linker Defects

Molecules ◽  
2021 ◽  
Vol 26 (19) ◽  
pp. 5736
Author(s):  
Chunhua Wang ◽  
Zhiquan Yu ◽  
Yuhao Yang ◽  
Zhichao Sun ◽  
Yao Wang ◽  
...  
Keyword(s):  
Thermal Treatment ◽  
High Selectivity ◽  
Reaction System ◽  
Pd Nanoparticles ◽  
Catalytic Performance ◽  
Lewis Acidity ◽  
Bifunctional Catalysts ◽  
Defect Sites ◽  
Highly Dispersed ◽  
Key Factor

Upgrading furfural (FAL) to cyclopentanone (CPO) is of great importance for the synthesis of high-value chemicals and biomass utilization. The hydrogenative ring-rearrangement of FAL is catalyzed by metal-acid bifunctional catalysts. The Lewis acidity is a key factor in promoting the rearrangement of furan rings and achieving a high selectivity to CPO. In this work, highly dispersed Pd nanoparticles were successfully encapsulated into the cavities of a Zr based MOF, UiO-66-NO2, by impregnation using a double-solvent method (DSM) followed by H2 reduction. The obtained Pd/UiO-66-NO2 catalyst showed a significantly better catalytic performance in the aforementioned reaction than the Pd/UiO-66 catalyst due to the higher Lewis acidity of the support. Moreover, by using a thermal treatment. The Lewis acidity can be further increased through the creating of missing-linker defects. The resulting defective Pd/UiO-66-NO2 exhibited the highest CPO selectivity and FAL conversion of 96.6% and 98.9%, respectively. In addition, the catalyst was able to maintain a high activity and stability after four consecutive runs. The current study not only provides an efficient catalytic reaction system for the hydrogenative ring-rearrangement of furfural to cyclopentanone but also emphasizes the importance of defect sites.

scholarly journals Enhanced Tensile Strength of Monolithic Epoxy with Highly Dispersed TiO2-Graphene Nanocomposites

2021 ◽  
Vol 5 (7) ◽  
pp. 191
Author(s):  
Yanshuai Wang ◽  
Siyao Guo ◽  
Biqin Dong ◽  
Feng Xing
Keyword(s):  
Tensile Strength ◽  
Epoxy Resin ◽  
Mechanical Performance ◽  
Chemical Properties ◽  
High Mechanical Property ◽  
Graphene Nanocomposites ◽  
Highly Dispersed ◽  
Dispersion State ◽  
Physical And Chemical

The functionalization of graphene has been reported widely, showing special physical and chemical properties. However, due to the lack of surface functional groups, the poor dispersibility of graphene in solvents strongly limits its engineering applications. This paper develops a novel green “in-situ titania intercalation” method to prepare a highly dispersed graphene, which is enabled by the generation of the titania precursor between the layer of graphene at room temperature to yield titania-graphene nanocomposites (TiO2-RGO). The precursor of titania will produce amounts of nano titania between the graphene interlayers, which can effectively resist the interfacial van der Waals force of the interlamination in graphene for improved dispersion state. Such highly dispersed TiO2-RGO nanocomposites were used to modify epoxy resin. Surprisingly, significant enhancement of the mechanical performance of epoxy resin was observed when incorporating the titania-graphene nanocomposites, especially the improvements in tensile strength and elongation at break, with 75.54% and 176.61% increases at optimal usage compared to the pure epoxy, respectively. The approach presented herein is easy and economical for industry production, which can be potentially applied to the research of high mechanical property graphene/epoxy composite system.

scholarly journals Highly dispersed Pt atoms and clusters on hydroxylated indium tin oxide: A view from first-principles calculations

2021 ◽  
Author(s):  
Simran Kumari ◽  
Philippe Sautet
Keyword(s):  
Heterogeneous Catalysis ◽  
Metal Atom ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
First Principles ◽  
Catalytic Performance ◽  
Small Cluster ◽  
Single Atom ◽  
First Principles Calculations ◽  
Highly Dispersed

Supported single-atom and small cluster catalysts have become highly popular in heterogeneous catalysis. These catalysts can maximize the metal atom utilization while still showcasing superior catalytic performance. One of the...

scholarly journals Ultra-small and highly-dispersed MoP particles for remarkable enhanced catalytic performance in higher alcohols synthesis

2020 ◽  
Vol 137 ◽  
pp. 105945 ◽  
Author(s):  
Bin Kang ◽  
Shuxia Qi ◽  
Xiaoman Wang ◽  
Fenghua Bai ◽  
Na Wang ◽  
...  
Keyword(s):  
Catalytic Performance ◽  
Higher Alcohols ◽  
Higher Alcohols Synthesis ◽  
Highly Dispersed

Synthesis, Characterization, and Catalytic Performance of Highly Dispersed Co-SBA-15

2009 ◽  
Vol 113 (33) ◽  
pp. 14863-14871 ◽  
Author(s):  
Chuan Wang ◽  
Sangyun Lim ◽  
Guoan Du ◽  
Codruta Zoican Loebicki ◽  
Nan Li ◽  
...  
Keyword(s):  
Catalytic Performance ◽  
Highly Dispersed

scholarly journals Highly dispersed Ni nanoparticles on 3D-mesoporous KIT-6 for CO methanation: Effect of promoter species on catalytic performance

2017 ◽  
Vol 38 (7) ◽  
pp. 1127-1137 ◽  
Author(s):  
Hong-Xia Cao ◽  
Jun Zhang ◽  
Cheng-Long Guo ◽  
Jingguang G. Chen ◽  
Xiang-Kun Ren
Keyword(s):  
Catalytic Performance ◽  
Ni Nanoparticles ◽  
Co Methanation ◽  
Highly Dispersed

Highly dispersed platinum in metal organic framework NH2-MIL-101(Al) containing phosphotungstic acid – Characterization and catalytic performance

2012 ◽  
Vol 289 ◽  
pp. 42-52 ◽  
Author(s):  
Enrique V. Ramos-Fernandez ◽  
Cyriel Pieters ◽  
Bart van der Linden ◽  
Jana Juan-Alcañiz ◽  
Pablo Serra-Crespo ◽  
...  
Keyword(s):  
Phosphotungstic Acid ◽  
Metal Organic Framework ◽  
Catalytic Performance ◽  
Highly Dispersed ◽  
Metal Organic ◽  
Organic Framework
Sign in / Sign up

Export Citation Format

Share Document