Hydrotalcites:Synthesis And Catalytic Decomposition Of Nitrous Oxide

Hydrotalcite is a kind of inorganic composite materials, has a wide application prospect in many fields. In this paper, using magnesium oxide and boehmite as raw material, the success of the acetic acid intercalation hydrotalcite synthesis, a series of problems on the synthesis process were studied, results showed that:used this method, hydrotalcite can exhibit three different layer spacing, which exhibits three phase state, respectively, smaller layer spacing is D phase, larger layer spacing is H phase and the two interlayer spacing folded together is I phase. The three phase can transform mutually under certain conditions. Phase difference, also has the distinction of arrangement of interlayer anions. D phase, acetic acid monolayer staggered; H phase, acetate as single-layer arrangement, but is defined between the two layers of water molecules, while the hydrotalcite after superposition of the two are arranged in the form I-phase. When using this method, the mechanism of synthetic hydrotalcite may be as follows:in the reaction, two kinds of oxide were transition hydroxide, leads to the formation of hydrotalcite in a suitable pH. N2O is a greenhouse gas, and ozone damage. Dispite the study on N2O is increasingly concerned by scholars, there are still mainly focused on the theoretical aspect. In this paper, combined with the practical industry, we discusses the decomposition properties of Co composite oxides under high concentration of N2O, investigate the effect of Co content, calcination temperature, dilution gas and other factors on the catalytic effect. The results showed that the Co2MgAl calcined at600catalyst has good catalytic activity in the4800h-1,575℃complete decomposition of20%N2O, the catalyst having excellent repetition performance characteristics. Study on the effect of alkali metal species, precursor, loading on the activity of N2O. The results show that:when the catalyst loading amount of alkali metals, activity has been greatly improved, using K2CO3as the impregnated catalyst precursor content, can complete decomposition of20%N2O at525℃.