Catalytic Combustion of Chlorobenzene with VOx/CeO2 Catalysts： Influence of Catalyst Synthesis Method

2019 ◽  
Vol 17 (12) ◽  
Author(s):  
Qi Shi ◽  
Hong-ming Long ◽  
Tie-jun Chun ◽  
Zhi-fang Gao
Keyword(s):  
Catalytic Combustion ◽  
Oxygen Vacancies ◽  
Preparation Method ◽  
Ph Value ◽  
Synthesis Method ◽  
Conversion Ratio ◽  
Shape Evolution ◽  
Surface Species ◽  
Catalyst Synthesis ◽  
New Phase

Abstract VOx/CeO2 catalysts with various nanostructure were synthesized by the hydrothermal method and used in catalytic combustion of chlorobenzene (CB) at a low temperature. XRD, BET, TEM, Raman, XPS, and H2-TPR were employed to reveal that catalysts VOx on CeO2 support had considerable activity for CB combustion. VOx/CeO2 catalysts prepared with ammonium to adjust pH value and added P123 as a surfactant, showed the highest CB conversion ratio of 60 % at 250 °C and 100 % at 400 °C. It showed that preparation method could infect the shape evolution and surface species during the synthesis. The new phase CeVO4 formed in VOx/CeO2 catalysts improved the catalysts efficiency by increasing oxygen vacancies.

Chemoselective Hydrogenation of Cinnamaldehyde over Tailored Oxygen Vacancy Rich Pd@ZrO2 Catalyst

2021 ◽  
Author(s):  
Komal N. Patil ◽  
Divya Prasad ◽  
Jayesh T. Bhanushali ◽  
Bhalchandra Kakade ◽  
Arvind H. Jadhav ◽  
...  
Keyword(s):  
Oxygen Vacancy ◽  
Selective Hydrogenation ◽  
Oxygen Vacancies ◽  
Synthesis Method ◽  
Chemoselective Hydrogenation ◽  
Zro2 Catalyst ◽  
Industrial Relevance

Selective hydrogenation of cinnamaldehyde to hydrocinnamaldehyde is captivating due to its industrial relevance. Herein, two-step synthesis method was adopted to develop oxygen vacancies in Pd@ZrO2 catalysts. The oxygen vacancies were...

scholarly journals Facile Synthesis of Silver Nanoparticles and Preparation of Conductive Ink

Nanomaterials ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 171
Author(s):  
Gui Bing Hong ◽  
Yi Hua Luo ◽  
Kai Jen Chuang ◽  
Hsiu Yueh Cheng ◽  
Kai Chau Chang ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Electrical Resistivity ◽  
Reaction Time ◽  
Reaction Temperature ◽  
Ph Value ◽  
Chemical Reduction ◽  
Flexible Substrate ◽  
Synthesis Method ◽  
Future Research ◽  
Conductive Ink

In the scientific industry, sustainable nanotechnology has attracted great attention and has been successful in facilitating solutions to challenges presented in various fields. For the present work, silver nanoparticles (AgNPs) were prepared using a chemical reduction synthesis method. Then, a low-temperature sintering process was deployed to obtain an Ag-conductive ink preparation which could be applied to a flexible substrate. The size and shape of the AgNPs were characterized by ultraviolet–visible spectrophotometry (UV-Vis) and transmission electron microscopy (TEM). The experiments indicated that the size and agglomeration of the AgNPs could be well controlled by varying the reaction time, reaction temperature, and pH value. The rate of nanoparticle generation was the highest when the reaction temperature was 100 °C within the 40 min reaction time, achieving the most satisfactorily dispersed nanoparticles and nanoballs with an average size of 60.25 nm at a pH value of 8. Moreover, the electrical resistivity of the obtained Ag-conductive ink is controllable, under the optimal sintering temperature and time (85 °C for 5 min), leading to an optimal electrical resistivity of 9.9 × 10−6 Ω cm. The results obtained in this study, considering AgNPs and Ag-conductive ink, may also be extended to other metals in future research.

Roles of Oxygen Vacancies in the Bulk and Surface of CeO2 for Toluene Catalytic Combustion

2020 ◽  
Vol 54 (19) ◽  
pp. 12684-12692
Author(s):  
Ziang Su ◽  
Wenhao Yang ◽  
Chizhong Wang ◽  
Shangchao Xiong ◽  
Xingzhong Cao ◽  
...  
Keyword(s):  
Catalytic Combustion ◽  
Oxygen Vacancies

Controllable construction of Ce‐Mn‐O x with tunable oxygen vacancies and active species for toluene catalytic combustion

2020 ◽  
Vol 34 (12) ◽  
Author(s):  
Zhenzhen Huang ◽  
Jinggang Zhao ◽  
Zhongxian Song ◽  
Wei Liu ◽  
Xuejun Zhang ◽  
...  
Keyword(s):  
Catalytic Combustion ◽  
Oxygen Vacancies ◽  
Active Species

Controllable synthesis of Au nanocrystals with systematic shape evolution from an octahedron to a truncated ditetragonal prism and rhombic dodecahedron

CrystEngComm ◽  
2019 ◽  
Vol 21 (37) ◽  
pp. 5602-5609 ◽  
Author(s):  
Yazhou Qin ◽  
Yuxiang Lu ◽  
Dongdong Yu ◽  
Jianguang Zhou
Keyword(s):  
Synthesis Method ◽  
Polyol Synthesis ◽  
Shape Evolution ◽  
Controllable Synthesis ◽  
Rhombic Dodecahedron ◽  
Stepwise Evolution

Stepwise evolution of Au nanocrystals from an octahedron to a truncated ditetragonal prism and rhombic dodecahedron was achieved by the polyol synthesis method.

Improvement of SAPO-34 performance in MTO reaction by utilizing mixed-template catalyst synthesis method

2014 ◽  
Vol 20 ◽  
pp. 312-318 ◽  
Author(s):  
Reza Bagherian Rostami ◽  
Mohammad Ghavipour ◽  
Reza Mosayebi Behbahani ◽  
Amirhossein Aghajafari
Keyword(s):  
Synthesis Method ◽  
Catalyst Synthesis ◽  
Mto Reaction ◽  
Mixed Template

High Efficiency CeCu Composite Oxide Catalysts Improved via Preparation Methods for Propyl Acetate Catalytic Combustion in Air

2016 ◽  
Vol 14 (3) ◽  
pp. 757-768 ◽  
Author(s):  
Hai Lan ◽  
Guilin Zhou ◽  
Cuijuan Luo ◽  
Yinrong Yu ◽  
Hongmei Xie ◽  
...  
Keyword(s):  
Solid Solution ◽  
Catalytic Combustion ◽  
Oxygen Vacancies ◽  
Oxide Catalysts ◽  
Oxygen Species ◽  
Propyl Acetate ◽  
Composite Oxide ◽  
Oxygen Desorption ◽  
Adsorbed Oxygen Species ◽  
Oxide Solid Solution

Abstract A famous hard-template method (HT), coprecipitation method (PC), and complex method (CA) were used to prepare CeCu composite oxide catalysts. The prepared catalysts were characterized via XRD, BET, Raman, XPS, FI–IR, and O2–TPD, and their catalytic activity and stability were evaluated for the propyl acetate catalytic combustion. The results showed that the CeCu oxide solid solution and oxygen vacancies were formed in the prepared CeCu oxide catalysts, even for CeCu–PC and CeCu–CA having a specific amount of isolated crystalline or amorphous CuO species. Comparing with the CeCu–PC and CeCu–CA of low porosity, CeCu–HT developed a mesoporous structure with a much larger specific surface area through a negative replica on the structure of KIT-6, and in it, CuO was completely dissolved in the CeO2 lattice to form more CeCu oxide solid solution and a large amount of oxygen vacancies. As a result, the CeCu–HT catalyst has more surface-adsorbed oxygen species, more –OH group which can also change into surface-adsorbed oxygen species at relatively high temperatures, higher oxygen desorption ability, and higher oxygen mobility than CeCu–PC and CeCu–CA. The CeCu–HT catalyst shows high and stable propyl acetate catalytic combustion performance at 190 °C. The propyl acetate catalytic combustion activity on the prepared CeCu oxide catalysts can be ranked as: CeCu–HT > CeCu–PC > CeCu–CA, which follows the orders of CeCu oxide solid solution content, surface-active oxygen content, and oxygen desorption and mobility of the CeCu composite oxide catalysts.

Synthesis Method and its Influence Factors of Hydrotalcite-Like Compounds

2013 ◽  
Vol 690-693 ◽  
pp. 351-354 ◽  
Author(s):  
Hong Dan Xue ◽  
Fu Li Wang ◽  
Guo Li Li ◽  
Pu Liu ◽  
Yong Qing Bai ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Reduction Method ◽  
Ph Value ◽  
Raw Materials ◽  
Sol Gel ◽  
Synthesis Method ◽  
Influence Factors ◽  
Synthetic Methods ◽  
Molar Ratio ◽  
Temperature Reaction

Hydrotalcite-like compounds are a class of anionic lays or layed double hydroxiods (LDHs) which consists of alkalescence, anion-exchanges and memory effect. The synthetic methods of LDHs include coprecipitation, hydrothermal synthesis, mirowave radiation, ion exchange, sol-gel method, roasting reduction method, instant synthesis, etc.The molar ratio of raw materials, pH value,reaction temperature,reaction time and so on have a greater impact on the purity and crystallinity of the LDHs.

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