Stability of copper molybdate catalysts for purification of diesel exhausts
UDC
541.128.3+66.048.6EDN
SFUHCRAbstract
One of the main concerns for environmental protection is a controlling the emission of soot particles from diesel engines. Earlier we have shown that CuMoO4 is active catalyst for soot combustion. In this work the research of mechanical, thermal and chemical stability of the copper molybdate catalytic coating on the titanium support is presented. Plasma electrolytic oxidation (PEO) technique and impregnation of a colloidal TiO2 suspension were used for preparation of oxide films on titanium surface. The copper molybdate catalyst was deposited by an extraction-pyrolytic method on PEO-coating and by sol-gel process on the TiO2 layer from colloidal suspension. The CuMoO4 phase grains with diameter less 0,5 μm were obtained using these methods. Coatings showed an excellent adherence when subjected to an ultrasonic test. An activity of the structured catalysts was characterized before and after five catalytic cycles up to 600 °C and a heating at 400 °C in flow of reactionary gases (SO2, Н2О), which are always present in diesel exhaust. The results have shown that developed catalysts provide diesel soot combustion above 280 °С, possess high thermal stability and are not subject to inhibitory action of gas SO2 and water vapor.
Keywords:
copper molybdate, catalytic soot combustion, adhesion, thermal stabilityFunding information
Работа выполнена при поддержке проекта ДВО РАН (12-I-П8-17).
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Copyright (c) 2014 Лебухова Н.В., Руднев В.С., Кириченко Е.А., Чигрин П.Г., Лукьянук И.В.
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