Recently, the research team of Professor Liu Yongning of the School of Materials Science and Engineering of Xi'an Jiaotong University, in collaboration with Professor Zhu Haiyan of Northwest University and Associate Professor Wu Gang of the State University of New York at Buffalo, proposed a catalyst preparation strategy based on porous nitrogen-containing carbon balls. After optimization of loading, the catalyst showed ultra-high catalytic activity and stability under alkaline conditions. Related research has been published in "American Chemical Society-Catalysis".
Direct methanol fuel cells are environmentally friendly, fuel is readily available, and are easy to carry, so they have huge market prospects. However, the methanol oxidation reaction kinetics of the direct methanol fuel cell anode is slow, and precious metal catalysts are easily poisoned by intermediate products during the alcohol oxidation process, resulting in a decline in catalytic activity.
The researchers proposed a catalyst preparation strategy that uses porous nitrogen-containing carbon spheres as a carrier and CeO2 nanodots as loading anchors to achieve high dispersion loading of nano-scale active sites. The results show that the rich pore structure of porous nitrogen-containing carbon spheres greatly enhances the degree of dispersion of Pd and CeO2, significantly refines the Pd particle size, effectively increases the electrochemically active area of ​​the catalyst, and further enhances the activity and activity of the catalyst. stability. The catalyst also exhibits excellent performance in a direct methanol fuel cell with a fiber membrane structure. (Reporter Zhang Xingyong)
ASTM A789 (ASME SA789) General purpose seamless and welded ferritic/austenitic stainless steel pipe
ASTM A790 (ASME SA790) Seamless and welded ferritic/austenitic stainless steel nominal pipe
GB/T 21833-2008 Austenitic - ferrite grades duplex stainless steel Seamless Steel Tube
Duplex stainless steel tube/super duplex stainless steel tube is composed by and phrase organization of
the austenitic and ferritic about half and half of the proportion. For It possessed both austenite and ferrite
stainless steel characteristics, so it owns high strength and corrosion resistance of stainless steel. Usually,
in the case of low carbon content of C, Cr content is about 18% ~ 28%, Ni content is about 3%-10%, Some
steel contain Mo, Cu, Nb, Ti, N and other alloy elements.Compared with ferrite, plasticity and toughness is higher
, there is no room temperature brittleness, intergranular corrosion resistance and welding performance were
significantly increased, while maintaining a ferritic stainless steel of 475 ℃ brittleness and high thermal conductivity,
it has the characteristic of superplasticity. Compared with austenitic stainless steel, the yield strength increased
significantly, the resistance to intergranular corrosion, stress corrosion and corrosion fatigue and abrasion
performance improved significantly.
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