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N2O Abatement over Ruthenium Supported on Highly Dispersed Hydrotalcite-Like Composite Metal Oxides
School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai, China
East China University of Science and Technology, Shanghai 200237, China, Bibo Road 942, No. 5-1103, Zhangjiang Hi-Tech park, Pudong, 201203 Shanghai, China
Final revision date: 2018-09-03
Online publication date: 2019-07-23
Pol. J. Environ. Stud. 2019;28(6):4477–4484
Highly dispersive hydrotalcite-like composite metal oxides were prepared by coprecipitation method. CO2-TPD characterization showed that the adsorption capacity over the samples at low (550ºC). The experimental results showed that the composite metal oxide, MexOy (Me=La, Mg, Al), had relatively good performance on N2O decomposition. A series of Ru/MexOy catalysts were prepared by programed impregnation method. CO2-TPD analysis indicated that the samples of Ru/MexOy not only increased the total CO2 adsorption capacity, but also obviously enhanced CO2 adsorption capacity at 300~550ºC compared with MexOy. TEM characterization showed that the Ru component was uniformly loaded on the support surface under nanoscale. N2O catalytic decomposition showed that the suitable Ru loading on support was 2.0(wt.)%, i.e., Ru(2.0)/MexOy. Under conditions of (v/v) 10% N2O+82% N2+5.0% O2+3.0% H2O, 30000h-1 of space velocity, 510ºC, the stability test showed that N2O conversion remained ca. 95.0%, indicating that Ru(2.0)/MexOy had good stability and activity at relatively low temperature.
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