Influence of the composition and conditions of heat treatment of palladium-rhodium alloys on their catalytic activity with respect to the dehydrogenation of cyclohexane

1974 ◽  
Vol 23 (10) ◽  
pp. 2100-2105
Author(s):  
E. V. Khrapova ◽  
V. M. Gryaznov ◽  
R. O. Mzee ◽  
N. R. Roshan ◽  
B. Dzhuntini
Keyword(s):  
Heat Treatment ◽  
Catalytic Activity ◽  
Dehydrogenation Of Cyclohexane

scholarly journals Effects of Heat Treatment on the Catalytic Activity and Methanol Tolerance of Carbon-Supported Platinum Alloys

2012 ◽  
Vol 3 (2) ◽  
pp. 108-118 ◽  
Author(s):  
Andiswa Nosipiwo Valisi ◽  
T. Maiyalagan ◽  
Lindiwe Khotseng ◽  
Vladimir Linkov ◽  
Sivakumar Pasupathi
Keyword(s):  
Heat Treatment ◽  
Catalytic Activity ◽  
Methanol Tolerance ◽  
Platinum Alloys ◽  
Supported Platinum

Enhanced catalytic activity and stability of CoAuPd nanocatalysts by combining methods of heat treatment and dealloying

2020 ◽  
Vol 381 ◽  
pp. 316-328 ◽  
Author(s):  
Lai-Ming Luo ◽  
Wei Zhan ◽  
Rong-Hua Zhang ◽  
Qing-Yun Hu ◽  
Yi-Fei Guo ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Catalytic Activity ◽  
Combining Methods

scholarly journals Electrooxidation of Hydrogen on Ni-Organic Metal Complex Catalysts in Acidic Media for PEMFCs

2011 ◽  
Vol 2011 ◽  
pp. 1-9
Author(s):  
Rui Lin ◽  
Jinli Qiao ◽  
Haiyan Zhang ◽  
Chunhui Cao ◽  
Jing Fu ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Catalytic Activity ◽  
Oxidation Reaction ◽  
Hydrogen Oxidation ◽  
Treatment Temperature ◽  
Organic Metal ◽  
Hydrogen Oxidation Reaction ◽  
Acidic Media ◽  
High Hydrogen ◽  
Metal Complex Catalysts

Novel organic metal complexes with N2O2coordination structure which showed high hydrogen oxidation reaction were synthesized. The catalytic activity was found to strongly depend on the heat-treatment temperature and the structural properties.

scholarly journals SYNTHESIS OF COMPLEX OXIDE COMPOSITIONS OF COBALT–MANGANESE AND CERIUM–ZIRCONIUM AND THEIR CATALYTIC ACTIVITY IN THE DECOMPOSITION OF HYDROGEN PEROXIDE

2019 ◽  
Vol 85 (11) ◽  
pp. 15-27
Author(s):  
Yuliia Pohorenko ◽  
Anatoliy Omel’chuk ◽  
Olexandr Ivanenko ◽  
Tamara Pavlenko
Keyword(s):  
Heat Treatment ◽  
Hydrogen Peroxide ◽  
Catalytic Activity ◽  
Mixed Oxides ◽  
Average Particle Size ◽  
Complex Oxide ◽  
Ammonia Solution ◽  
Average Particle ◽  
Zirconium Oxides ◽  
Co Precipitation

Cobalt oxides and/or manganese and their com-position based on cerium and zirconium oxides (CeO2 : ZrO2 = 1:1 mol.%) with a content of up to 20 wt. % are synthesized. Samples of both individual oxides and complex oxide compositions were prepared by precipitation from solutions of am-monia (room temperature) or hexamethylenetet-ramine (80–90 °C) followed by heat treatment. Results of DTA show, that due to the calcination at 400 ° C (2 h), the obtained samples lose 17–22 wt. % corresponding to 2–3.8 molecules of water. According to the X-ray powder analysis, initially are formed hydroxide compounds of cobalt (CoO· xH2O) and manganese (MnO2·yН2О), which, after being heated at 400 °C for 2 hours, are converted into mixed oxides from the composition of Co3O4 and Mn3O4. The average particle size calculated by the Sherer equation is 18–30 nm. In the study of catalytic activity on the example of the reaction of the hydrogen peroxide decomposition, it was found that the obtained samples from the solution of GMTA show a greater ability to catalytically decompose hydrogen peroxide compared to samples obtained from the ammonia solution. In this case, the catalytic activity of dried samples is twice as high as roasted, regardless of the method of obtaining. Samples of oxide compo-sitions with deposited 5–10 wt. % of Ce–Zr oxides (1:1) exhibit the highest ability to decompose H2O2. In this case, samples of compositions obtained from the solution of GMTA, have a prolonged catalytic action, and when precipitation in the solution of ammonia, the reaction takes place quite actively during 4–5 days. Compositions formed from co-deposited or mechanically mixed hydroxocompounds of cobalt and manganese with 5 wt. % of CeO2–ZrO2 (1:1) deposited on them have different catalytic activity. In the case of mechanically mixed, it is 30% lower and with subsequent calcination at 400 °C, it is reduced by almost half, and with co-precipitation, the activity is quite high and does not change with heat treatment. In the case of obtaining samples of Co–Mn with Ce–Zr (1:1) deposited on them in excess of 10 wt. % the catalytic activity of the samples dried at 80 °C is equal to the activity of the co-deposited hydroxocompounds of cobalt and manganese and  the  calcination  at  400  °C  it  reduces  it by  30 %. The best ability for catalysis was found in samples CoO·xH2O + 5 wt. % MnO2·yН2О, СоO×хН2О + 10 wt. % CeO2:ZrO2 and СоO×хН2О–MnO2×yН2О, precipitated with the GMTA solution and dried at 80 °C. The besser catalytic properties revealed a sample of СоО×хН2О + 10 wt. % CeO2:ZrO2, which with-out stirring is capable of decomposing 1.2–1.4 dm3/g of hydrogen peroxide with a rapid reaction and in the experiment the volume of H2O2 reacted was 3.4 dm3/g.

High-heat treatment enhanced catalytic activity of CuO/CeO2 catalysts with low CuO content for CO oxidation

2020 ◽  
Vol 10 (15) ◽  
pp. 5256-5266 ◽  
Author(s):  
Jihang Yu ◽  
Qiangsheng Guo ◽  
Xiuzhen Xiao ◽  
Haifang Mao ◽  
Dongsen Mao ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Catalytic Activity ◽  
Co Oxidation ◽  
Active Sites ◽  
High Heat ◽  
Catalytic Performance

CuO/CeO2 catalysts with low CuO content and calcined at 800 °C exhibited better catalytic performance than those calcined at 500 °C. The coordinatively unsaturated copper atoms were proved to be the main active sites in the CuO/CeO2 catalysts.

scholarly journals Effect of heat treatment under vacuum on structure and visible-light photocatalytic activity of nano-TiO2

RSC Advances ◽  
2019 ◽  
Vol 9 (56) ◽  
pp. 32691-32698
Author(s):  
Zhengyuan Gao ◽  
Pengfei Sun ◽  
Yiliu Fang ◽  
Chuanqiang Li ◽  
Xiaoya Yuan ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Photocatalytic Activity ◽  
Catalytic Activity ◽  
Visible Light ◽  
High Catalytic Activity ◽  
Nano Tio2 ◽  
Visible Light Photocatalytic Activity ◽  
Visible Light Photocatalytic

Nano-TiO2 is known as a photocatalyst with high catalytic activity.

scholarly journals Nitrogen-doped porous activated carbon derived from cocoon silk as a highly efficient metal-free electrocatalyst for the oxygen reduction reaction

RSC Advances ◽  
2017 ◽  
Vol 7 (22) ◽  
pp. 13383-13389 ◽  
Author(s):  
Peng Fu ◽  
Lihua Zhou ◽  
Lihua Sun ◽  
Baohua Huang ◽  
Yong Yuan
Keyword(s):  
Heat Treatment ◽  
Catalytic Activity ◽  
Activated Carbon ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Chemical Activation ◽  
Reduction Reaction ◽  
Nitrogen Doped ◽  
Metal Free ◽  
Porous Activated Carbon

Nitrogen-doped porous activated carbon (PAC) has been fabricated via a facile heat-treatment and chemical activation of cocoon silk. The prepared PAC exhibits excellent ORR catalytic activity.

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