Catalytic Oxidation of Formaldehyde Over Mesoporous MnOx-CeO2 Catalysts

2015 ◽  
Vol 14 (01n02) ◽  
pp. 1460028 ◽  
Author(s):  
Yanlei Zhao ◽  
Hua Tian ◽  
Junhui He ◽  
Qiaowen Yang
Keyword(s):  
Low Temperature ◽  
Indoor Air ◽  
Active Sites ◽  
Harmful Effect ◽  
Practical Interest ◽  
Catalytic Performance ◽  
Air Pollutant ◽  
Ordered Mesoporous ◽  
Formaldehyde Oxidation ◽  
Catalytic Performances

Formaldehyde is regarded as the major indoor air pollutant. Because of harmful effect on human health, its emission abatement is of significant practical interest. We report here excellent low-temperature catalytic performances of mesoporous MnO x - CeO 2 catalysts in the process of formaldehyde oxidation. These MnO x - CeO 2 catalysts were synthesized by a "nanocasting" method using SBA-15 as hard template. TEM images showed that the as-fabricated MnO x - CeO 2 composites possess well-ordered mesoporous architectures. Results of catalytic tests revealed that mesoporous MnO x - CeO 2 nanocomposites have excellent low-temperature catalytic activity for formaldehyde oxidation, the temperature for 100% formaldehyde conversion can be as low as 65°C over these noble-metal-free mesoporous catalysts. The excellent catalytic performance is attributed to their ordered mesoporous structures that expose abundant active sites to formaldehyde molecules.

Highly Efficient Ru/CeO2 Catalyst for Formaldehyde Oxidation at Low Temperature and Mechanistic Study

2021 ◽  
Author(s):  
Xiaoxiao Qin ◽  
Xueyan Chen ◽  
Min Chen ◽  
Jiangho Zhang ◽  
Hong He ◽  
...  
Keyword(s):  
Low Temperature ◽  
Indoor Air ◽  
Air Purification ◽  
Mechanistic Study ◽  
Highly Efficient ◽  
Formaldehyde Oxidation ◽  
Indoor Air Purification

Formaldehyde (HCHO) elimination at low temperature is of great interest for indoor air purification. In this work, 1 wt. % Ru supported on CeO2 and Al2O3 catalysts were prepared by...

scholarly journals Co-Promoted Ni Nanocatalysts Derived from NiCoAl-LDHs for Low Temperature CO2 Methanation

Catalysts ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 121
Author(s):  
Fanying Zhang ◽  
Bin Lu ◽  
Peiqin Sun
Keyword(s):  
Low Temperature ◽  
Active Sites ◽  
High Performance ◽  
Carbon Deposition ◽  
Catalytic Performance ◽  
Ni Nanoparticles ◽  
Co2 Methanation ◽  
Test Conditions ◽  
Challenging Research ◽  
Continuous Reaction

Ni-based catalysts are prone to agglomeration and carbon deposition at high temperatures. Therefore, the development of Ni-based catalysts with high activities at low temperatures is a very urgent and challenging research topic. Herein, Ni-based nanocatalysts containing Co promoter with mosaic structure were prepared by reduction of NiCoAl-LDHs, and used for CO2 methanation. When the reaction temperature is 250 °C (0.1 MPa, GHSV = 30,000 mL·g−1·h−1), the conversion of CO2 on the NiCo0.5Al-R catalyst reaches 81%. However, under the same test conditions, the conversion of CO2 on the NiAl-R catalyst is only 26%. The low-temperature activity is significantly improved due to Co which can effectively control the size of the Ni particles, so that the catalyst contains more active sites. The CO2-TPD results show that the Co can also regulate the number of moderately basic sites in the catalyst, which is beneficial to increase the amount of CO2 adsorbed. More importantly, the NiCo0.5Al-R catalyst still maintains high catalytic performance after 92 h of continuous reaction. This is due to the confinement effect of the AlOx substrate inhibiting the agglomeration of Ni nanoparticles. The Ni-based catalysts with high performance at low temperature and high stability prepared by the method used have broad industrial application prospects.

scholarly journals Bridging Adsorption Analytics and Catalytic Kinetics for Metal-Exchanged Zeolites

2020 ◽  
Author(s):  
Pengfei Xie ◽  
Tiancheng Pu ◽  
Gregory Aranovich ◽  
Jiawei Guo ◽  
Marc Donohue ◽  
...  
Keyword(s):  
Low Temperature ◽  
Active Sites ◽  
Molecular Spectroscopy ◽  
Catalytic Performance ◽  
Quantitative Information ◽  
Adsorption Properties ◽  
Structure Property ◽  
Atomic Structures ◽  
Structure Property Relationships ◽  
High Temperature Reaction

Abstract Metal-exchanged zeolites have been widely used in industrial catalysis and separation, but fundamental understanding of their structure-property relationships has remained challenging, largely due to the lack of quantitative information concerning the atomic structures and reaction-relevant adsorption properties of the embedded metal active sites. We report on the use of low-temperature chemisorption to titrate Cu-exchanged ZSM5. Quantitative descriptors of the atomic structures and adsorption properties of Cu-ZSM5 are established by combining atomistic simulation, DFT calculations, operando molecular spectroscopy, chemisorption and titration measurements. These descriptors are then applied to interpret the catalytic performance of Cu-ZSM5 for NO decomposition. Linear correlations are established to bridge the low-temperature adsorption analytics and high-temperature reaction kinetics, which are demonstrated to be generally applicable for understanding the structure-property relationships of metal exchanged zeolites and foregrounded for guiding the development of advanced catalytic materials.

SiO2-stabilized Ni/t-ZrO2 catalysts with ordered mesopores: one-pot synthesis and their superior catalytic performance in CO methanation

2016 ◽  
Vol 6 (10) ◽  
pp. 3529-3543 ◽  
Author(s):  
Xiaoyan Wang ◽  
Qing Liu ◽  
Jiaxing Jiang ◽  
Guojing Jin ◽  
Huifang Li ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Low Temperature ◽  
Mesoporous Structure ◽  
Catalytic Performance ◽  
One Pot ◽  
Co Methanation ◽  
One Pot Synthesis ◽  
Ordered Mesoporous ◽  
Ordered Mesopores

Ternary SiO2-stabilized Ni/t-ZrO2 catalysts with an ordered mesoporous structure were synthesized, which show excellent low temperature activity and thermal stability.

Promoting effects of ceria on the catalytic performance of gold supported on TiO2 for low-temperature CO oxidation

RSC Advances ◽  
2014 ◽  
Vol 4 (33) ◽  
pp. 16985-16991 ◽  
Author(s):  
Jun Yu ◽  
Guisheng Wu ◽  
Guanzhong Lu ◽  
Dongsen Mao ◽  
Yun Guo
Keyword(s):  
Low Temperature ◽  
Co Oxidation ◽  
Active Sites ◽  
High Stability ◽  
Oxygen Vacancies ◽  
Catalytic Performance ◽  
Quick Recovery ◽  
Low Temperature Co Oxidation

Doping with Ce enhanced the Au–support synergy and modified the active sites. The effortless decomposition of carbonates and quick recovery of oxygen vacancies on the Au/CeO2–TiO2 surface may be responsible for its high stability.

scholarly journals Co-blending modification of activated coke using pyrolusite and titanium ore for low-temperature NOx removal

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Lin Yang ◽  
Lu Yao ◽  
Yuguo Lai ◽  
Xia Jiang ◽  
Wenju Jiang
Keyword(s):  
Mass Transfer ◽  
Electron Transfer ◽  
Low Temperature ◽  
Active Sites ◽  
Surface Acidity ◽  
Catalytic Performance ◽  
Bridge Structure ◽  
Nox Removal ◽  
No Removal ◽  
Activated Coke

Abstract Activated coke (AC) has great potential in the field of low-temperature NO removal (DeNOx), especially the branch prepared by blending modification. In this study, the AC-based pyrolusite and/or titanium ore blended catalysts were prepared and applied for DeNOx. The results show blending pyrolusite and titanium ore promoted the catalytic performance of AC (Px@AC, Tix@AC) clearly, and the co-blending of two of them showed a synergistic effect. The (P/Ti-1/2)15@AC performed the highest NO conversion of 66.4%, improved 16.9% and 16.0% respectively compared with P15@AC and Ti15@AC. For the (P/Ti-1/2)15@AC DeNOx, its relative better porous structure (SBET = 364 m2/g, Vmic = 0.156 cm3/g) makes better mass transfer and more active sites exposure, stronger surface acidity (C–O, 19.43%; C=O, 4.16%) is more favorable to the NH3 adsorption, and Ti, Mn and Fe formed bridge structure fasted the lactic oxygen recovery and electron transfer. The DeNOx of (P/Ti-1/2)15@AC followed both the E–R and L–H mechanism, both the gaseous and adsorbed NO reacted with the activated NH3 due to the active sites provided by both the carbon and titanium.

The active sites of supported silver particle catalysts in formaldehyde oxidation

2016 ◽  
Vol 52 (65) ◽  
pp. 9996-9999 ◽  
Author(s):  
Yaxin Chen ◽  
Zhiwei Huang ◽  
Meijuan Zhou ◽  
Pingping Hu ◽  
Chengtian Du ◽  
...  
Keyword(s):  
Active Sites ◽  
Silver Particle ◽  
Catalytic Performance ◽  
Formaldehyde Oxidation ◽  
Catalytically Active ◽  
D Orbitals ◽  
Silver Atoms

Surface silver atoms with upshifted d-orbitals are identified as the catalytically active sites in formaldehyde oxidation by correlating their activity with the number of surface silver atoms, and the degree of the d-orbital upshift governs the catalytic performance of the active sites.

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