Effect of Calcination Temperature on the Properties of Nano-sized Vanadium Catalyst
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摘要: 采用不同的焙烧温度制备纳米钒催化剂,并进行微观形貌、活性、机械强度和耐腐蚀性能的测试与分析。结果表明,650℃焙烧纳米钒催化剂具有最佳的活性、机械强度和耐腐蚀性能;在试样活性测试过程的耐热温度为500℃时,650℃焙烧的试样的的活性较500℃焙烧的试样增加24.6%、较800℃焙烧的试样增加38.6%;机械强度较500℃焙烧的试样提高28.4%、较800℃焙烧的试样提高45.8%;腐蚀电位较500℃焙烧的试样正移97 mV、较800℃焙烧的试样正移222 mV。Abstract: Nano-sized vanadium catalysts were prepared under different calcination temperatures,and the micro-morphology,activity,mechanic strength and corrosion resistance of the catalysts were tested and analyzed. The results show that the nano-sized vanadium catalyst prepared at 650 ℃ has the best activity,mechanic strength and corrosion resistance. Under 500 ℃ of the heat-resisting temperature in the activity test,activity of the catalyst with calcination temperature of 650 ℃ increases by 24.6% and 38.6%,compared with that of the catalyst prepared at 500 ℃ and 800 ℃,respectively. The mechanic strength of the catalyst prepared at 650 ℃ is respectively 28.4% and 45.8% higher than that of sample with calcination temperature of 500 ℃ and 800 ℃. Furthermore,the corrosion potential of the nano-sized vanadium catalyst calcined at 650 ℃ positively shifts by 97 mV and 222 mV with comparison to that of the catalyst prepared at 500 ℃ and 800 ℃,respectively.
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