With Fe 3 O 4 as the carrier, tetrabutyl titanate as precursor, the TiO 2 was 8 wrapped on the surface of Fe 3 O 4 by hydrothermal method to synthesize the 9 Fe 3 O 4 -TiO 2 composite. X-ray powder diffraction(XRD), Transmission electron 10 microscopy (TEM) and Fourier transform infrared (FTIR) analysis showed that the 11 nano TiO 2 formed a better coating layer on the surface of Fe 3 O 4 particles. In the 12 experiment, the simulation of the SO 2 and NO of the industrial coal-fired flue gas was 13 tested respectively by Fe 3 O 4 , TiO 2 and x%Fe 3 O 4 -TiO 2 (x% represents the mass 14 fraction of Fe 3 O 4 of the total material). The results showed that the activities of TiO 2 15 and Fe 3 O 4 -TiO 2 were good, and both of them had good removal effect on SO 2 and 16 NOx. TiO 2 was wrapped on Fe 3 O 4 , which formed a special package structure, the 17 surface layer of nano TiO 2 and Fe 3 O 4 carrier can promote each other, the performance 18 of simultaneous desulfurization and denitrification can be further improved. 19 Fe 3 O 4 -TiO 2 composites with different ratio were tested at 100℃; 10% Fe 3 O 4 -TiO 2 had 20 high reaction performance; the removal effect gradually decreased with the increase 21 of Fe 3 O 4 content. The performance of 10%Fe 3 O 4 -TiO 2 composite on simultaneous 22 desulfurization and denitrification at 100℃,150℃,200℃ was in descending order. At 23 the temperature of 100℃, the removal effect of 10%Fe 3 O 4 -TiO 2 on SO 2 and NOx can 24 be maintained at 100% and 50% respectively, and it was not until after 64 min the 25 NOx was close to penetrate. The addition of H 2 O enhanced the SO 2 adsorption; and 26 the NO adsorption capacity decreased with the increase of the H 2 O content. NOx and 27 SO 2 were adsorbed on the surface of the composite material by physical and chemical 28 adsorption, the products were sulfate and nitrate according to the results of the 1 characterization. 2
The effects of a series divalent metals, ratios of metals, and calcination temperature on the performance of simultaneous desulfurization and denitrification over the hydrotalcite-like compound (HTLC) catalyst were investigated, and the removal mechanism of HTLCs was characterized by X-ray powder diffraction (XRD), Brunauer–Emmett–Teller (BET) surface areas, temperature-programmed desorption–mass spectroscopy (TPD–MS), and Fourier transform infrared spectroscopy (FTIR) analyses. The results showed that Ni/Fe HTLCs had the best adsorption property to remove SO2 and NO among the three HTLCs: Ni/Fe, Mg/Fe, and Co/Fe HTLCs. The optimum preparation conditions of the adsorbent were at the Ni/Fe mole ratio of 2 and calcined at 300 °C. The high specific surface area as well as the existence of Fe2O3 phases resulted in excellent NO and SO2 adsorption capacities. The removal rate of SO2 and NO still remained at 95 and 50% when the reaction time had extended to 40 min. A total of 13% CO2 of the simulated flue gas had no significant effect on the adsorption of NO and SO2. The NO adsorption capacity decreased slowly with the increase of the H2O concentration, and a total of 2% H2O enhanced the SO2 adsorption capacity but inhibited the SO2 adsorption slightly when the H2O concentration still increased to 5%. SO2 was chemisorbed on the Ni/Fe HTLCs, and the products were sulfate and sulfite according to the characterization results. However, NO was physisorbed and chemisorbed on the Ni/Fe HTLCs, and the chemisorption products were nitrate and nitrite.
A special Chinese herbal medicine (SCHM) harvester was designed to address the problems such as the highly labor-intensive process, low harvesting efficiency, and lack of suitable machinery. The designed machine was comprised of three main components, including a reciprocating cutter, a clamping chain, and a counter roller. In addition, a mechanical model of a plant stalk during harvester operation is established to analyze the parameters affecting SCHM harvesting: sprocket rotation speed, counter roller gap, and header inclination angle. Considering the operating mode of the harvester, all three parameters were taken as test factors, and the proportion of lost fruit, the proportion of broken capsules, and the length of the retained stem are the test indicators. According to the test results, the fruit lost was 1.14%, the broken fruit was 1.02%, the stalks with an acceptable length was 82.45% at a sprocket rotation speed of 110 r/min, a roller gap of 9 mm, and a header inclination angle of 5°. The research can provide an effective solution to solve the SCHM harvest problem. Further studies need to do for making this machine more automated and intelligent.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.