Tensor 27 fourier transform infrared ftir spectrometer

Structure information of the electrospun fibers was obtained using a Bruker Tensor 27 Fourier transform infrared (FTIR) spectrometer (Billerica, MA, USA). The spectrometer is equipped with a deuterated triglycine sulfate detector, and a multiple reflection, horizontal MIRacle ATR attachment with a Ge crystal (Pike Tech, Madison, WI, USA). A continuously purging nitrogen gas was provided while the experiments were conducted. The spectra were taken at a range of 4000 to 400 cm⁻¹ with 128 background scans and 128 sample scans at a resolution of 4 cm⁻¹. Each sample was characterized at three different spots to ensure homogeneity.

A Bruker Tensor 27 Fourier-Transform Infrared (FTIR) Spectrometer (Billerica, MA, USA) was used, equipped with a deuterated triglycine sulfate detector and a multiple reflection, horizontal MIRacle ATR attachment (using a Ge crystal, from Pike Tech. (Madison, WI, USA)) that was continuously purged with nitrogen gas. Readings were taken at a range of 4000 to 400 cm⁻¹ with 64 background scans and 64 sample scans at a resolution of 4 cm⁻¹. For each film sample, four total measurements were taken to ensure homogeneity. However, only one spectrum is shown in this report to demonstrate the overall trend. Between samples, the ATR crystal was cleaned with methanol.

The denitrification material was injected into the preheater and then gradually fed into the precalciner and rotary kiln with cement raw meal. The reaction temperature was gradually increased to over 1000 °C. In order to imitate the denitrification reactions in the chemical laboratory, the NO decomposition reaction was carried out in a quartz fixed-bed reactor on a laboratory scale and heated with an electrically controlled heating oven, as shown in Figure 2 [14 (link)]. The decomposition reaction of NO was conducted in a quartz tube reactor filled with 2 mL of denitrification material. The thermocouple was positioned at the reactor’s core to measure the temperature of the test. The overall flow rate was 300 mL/min. The conditions for the reactant gases were as follows: 1000 ppm NO and helium (He) balanced gas. The materials and reactant gas were heated using a heating rate of 15 °C/min from ambient temperature to 1000 °C. The concentrations of nitric oxide (NO), nitrogen dioxide (NO₂), and nitrous oxide (N₂O) were continuously monitored using a TENSOR 27 Fourier-transform infrared (FT-IR) spectrometer (Bruker, Germany), and the NO decomposition rate was calculated according to the following equation: