Fourier transform infrared spectroscopy method was applied to quantitative gas analysis of CO and CO2. The infrared transmittance spectra of these two kind of measured gases were acquired Using infrared spectrometer system. Nonlinear least square algorithm was used to fit the measured transmittance spectra based on the infrared spectra data in standard HITRAN database and the concentrations of the measured gases were retrieved.
Using analytically pure Fe2(SO4)3(AP)and NH3·H2O(AP)as raw materials,Sn-doped α-Fe2O3 powders with corundum structures were prepared by homogenous co-precipitation method under different Fe3+ concentrations,ratios of Sn4+:Fe3+,pH values and heat treatment temperatures.
The results show that the synthesized precursor has an ordered pore structure when the Ti(SO4)2 hydrolysis pH value is 1, the hydrolysis temperature is at an ambient temperature, the concentration of sodium silicate is approximately 0.1 mol/L, and the initial concentration of titanium sulfate is approximately 0.125 mol/L.