Catalytic performance in methane combustion of rare-earth perovskites RECo0.50Mn0.50O3 (RE: La, Er, Y)

2011 ◽  
Vol 172 (1) ◽  
pp. 111-117 ◽  
Author(s):  
Gina Pecchi ◽  
Claudia Campos ◽  
Octavio Peña
Keyword(s):  
Rare Earth ◽  
Methane Combustion ◽  
Catalytic Performance

scholarly journals Effect of calcination temperature on rare earth tailing catalysts for catalytic methane combustion

2020 ◽  
Vol 9 (1) ◽  
pp. 734-743
Author(s):  
Ran Zhao ◽  
ZiChen Tian ◽  
Zengwu Zhao
Keyword(s):  
Rare Earth ◽  
Mine Tailings ◽  
Photoelectron Spectroscopy ◽  
Methane Combustion ◽  
Space Velocity ◽  
High Catalytic Activity ◽  
Reduction Peak ◽  
X Ray ◽  
Different Temperatures ◽  
Bayan Obo

AbstractBayan Obo tailings are rich in rare earth elements (REEs), iron, and other catalytic active substances. In this study, mine tailings were calcined at different temperatures and tested for the catalytic combustion of low-concentration methane. Upon calcination at 600°C, high catalytic activity was revealed, with 50% CH4 conversion at 587°C (space velocity of 12,000 mL/g h). The physicochemical properties of catalysts were characterized using thermogravimetric analysis, X-ray diffraction, scanning electron microscopy, hydrogen temperature-programmed reduction (H2-TPR), and X-ray photoelectron spectroscopy (XPS). Compared to the raw ore sample, the diffraction peak intensity of Fe2O3 increased post calcination, whereas that of CeCO3F decreased. A porous structure appeared after the catalyst was calcined at 600°C. Additionally, Fe, Ce, Ti, and other metal elements were more highly dispersed on the catalyst surface. H2-TPR results revealed a broadening of the reduction temperature range for the catalyst calcined at 600°C and an increase in the reduction peak. XPS analysis indicated the presence of Ce in the form of Ce3+ and Ce4+ oxidation states and the coexistence of Fe in the form of Fe2+ and Fe3+. Moreover, XPS revealed a higher surface Oads/Olatt ratio. This study provides evidence for the green reuse of Bayan Obo mine tailings in secondary resources.

Effect of Ca doping on the catalytic performance of CuO–CeO2 catalysts for methane combustion

2010 ◽  
Vol 11 (9) ◽  
pp. 858-861 ◽  
Author(s):  
Dongsheng Qiao ◽  
Guanzhong Lu ◽  
Dongsen Mao ◽  
Xiaohui Liu ◽  
Hongfeng Li ◽  
...  
Keyword(s):  
Methane Combustion ◽  
Catalytic Performance ◽  
Ca Doping

scholarly journals Dehydration of Biomass-Derived Butanediols over Rare Earth Zirconate Catalysts

Catalysts ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1392
Author(s):  
Asami Matsuda ◽  
Yoshitaka Matsumura ◽  
Kazuki Nakazono ◽  
Fumiya Sato ◽  
Ryoji Takahashi ◽  
...  
Keyword(s):  
Rare Earth ◽  
Flow Reactor ◽  
Rare Earth Metals ◽  
Fluorite Structure ◽  
Catalytic Performance ◽  
High Specific Surface Area ◽  
Heavy Rare Earth ◽  
High Crystallinity ◽  
Unsaturated Alcohols ◽  
Selective Formation

The aim of this work is to develop an effective catalyst for the conversion of butanediols, which is derivable from biomass, to valuable chemicals such as unsaturated alcohols. The dehydration of 1,4-, 1,3-, and 2,3-butanediol to form unsaturated alcohols such as 3-buten-1-ol, 2-buten-1-ol, and 3-buten-2-ol was studied in a vapor-phase flow reactor over sixteen rare earth zirconate catalysts at 325 °C. Rare earth zirconates with high crystallinity and high specific surface area were prepared in a hydrothermal treatment of co-precipitated hydroxide. Zirconates with heavy rare earth metals, especially Y2Zr2O7 with an oxygen-defected fluorite structure, showed high catalytic performance of selective dehydration of 1,4-butanediol to 3-buten-1-ol and also of 1,3-butanediol to form 3-buten-2-ol and 2-buten-1-ol, while the zirconate catalysts were less active in the dehydration of 2,3-butanediol. The calcination of Y2Zr2O7 significantly affected the catalytic activity of the dehydration of 1,4-butanediol: a calcination temperature of Y2Zr2O7 at 900 °C or higher was efficient for selective formation of unsaturated alcohols. Y2Zr2O7 with high crystallinity exhibits the highest productivity of 3-buten-1-ol from 1,4-butanediol at 325 °C.

Preparation and Characterization of Rare Earth Composite Catalytic Materials for Conversion of Exhaust from Natural Gas Automobiles

2013 ◽  
Vol 320 ◽  
pp. 413-418
Author(s):  
Yan Kun Yuan ◽  
Gang Xue ◽  
Sai Fei Wang ◽  
Xue Liang Zhang
Keyword(s):  
Rare Earth ◽  
Specific Surface ◽  
Sol Gel ◽  
Methane Combustion ◽  
Fluorite Structure ◽  
Perfect Crystal ◽  
Reduction Peak ◽  
Transmission Electron ◽  
Catalytic Material ◽  
Temperature Programmed

A series of rare-earth composite catalytic material LZ1,LZ2 and LZ3 that contains mixture of La0.9Sr0.1Co0.5Mn0.5O3and Ce0.7Zr0.3O2in different proportion (3:7, 5:5, 7:3) were prepared by a sol-gel method and characterized by X-ray diffraction (XRD), specific surface analysis (BET) , Transmission electron microscopy (TEM) and temperature programmed reduction (TPR). The results indicated that in LZ3, a perfect crystal structure of perovskite and a cubic fluorite structure were formed. Besides LZ3 presented scattered spherical granules with a particle size of about 30 nm and a specific surface area of 20.9870 m2/g. The temperature of reduction peak was lowest (490°C) and peak area was larger, so it had the best catalytic activity for methane combustion.

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