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Highly active and stable CuxFey/AC-H catalysts with CuFe2O4 for NO reduction by CO in the presence of H2O and SO2 under regeneration gas
No full textFor industrial flue gas, the synergistic removal of NOx and CO pollutants is in high demand but still has not been realized due to the presence of O-2. We propose firstly that activated carbon regeneration gas provides suitable O-2-free conditions for NO reduction by CO, but high contents of 5% SO2 and 5% H2O affect the catalyst activity. Here, we report a bimetallic modified catalyst CuxFey/AC-H that exhibits high catalytic activity under the abovementioned conditions due to the high amount of CuFe2O4. By regulating the Cu/Fe ratio, the formation of CuFe2O4 active sites is promoted, which improves the redox properties, adsorption and activation capacity of NO, the ratio of high valence metal, and content of synergistic oxygen vacancies. Based on in situ DRIFTS and fixed-bed FTIR/MS combined platform, it was found that the side reaction of H2O with the intermediate of-NCO forms NH3 above 250 degrees C and with CO forms H-2 above 400 degrees C center dot NH3 and H-2 provide additional reaction pathways of Fast-SCR and H-2-SCR to significantly improve the reaction activity with 92.0% of NO conversion at 450 degrees C and 108,000 mL g(-1)h(-1) on Cu2Fe2/AC-H. According to DFT calculations, CuFe2O4 active sites provide the high binding energy of sulfation, and then Cu2Fe2/AC-H demonstrates excellent activity and long-term stability with 72.2% of NO conversion at high contents of SO2 and H2O for 48 h. And CuxFey/AC-H provides great potential prospects for the application of NO reduction by CO under activated carbon regeneration gas
Open Research Fund of Shanghai Key Laboratory of Green Chemistry and Chemical Processes of East China Normal University
No full textIonic liquid crystal electrolytes: Fundamental, applications and prospects
No full textCurrent available organic liquid electrolytes of electrochemical energy devices lead to fast performance degra-dation and even combustion. Such challenges call for the development of advanced electrolytes with remarkable safety and electrochemical performances. Via integrating the merits of ionic liquids and liquid crystals, the emerging ionic liquid crystals (ILCs) enable the feasibility of design, manipulation of defined ion transport channels through modulated nanosegregated structures, and the high operational safety. Previous reviews rarely focus on the ion conductive and working mechanisms of ILC electrolytes in energy storage and conversion de-vices, which are critical for the development of superior electrolytes. Hence, our review is oriented to construct a key scheme of component-(micro)structure-fundamental-properties-electrochemical interaction of ILC electro-lytes for energy storage applications. Especially, the ion transportation mechanism and working principles of ILC electrolytes are comprehensively summarized to highlight their ion redistribution ability and high stability. Moreover, the challenges and design rules of ILC electrolytes are outlined to thrill their development in energy storage fields
A Novel Silicone Rubber for Situation Awareness
No full textAbstract
An insulator plays an important role in the external insulation of power grid. The antifouling flashover coating on the insulator’s surface can effectively reduce the incidence of pollution flashover accidents. Local overheating, local arc, lightning and other damage lead to the deterioration of the antifouling flashover coating, resulting in pollution flashover accidents. In order to realize the on-line identification of electric arc on the surface of antifouling flashover coating, various functional nanoparticles were prepared and added into the silicone rubber to prepare functional antifouling flashover coating. The colour deviation of the coating heated at different temperatures was measured by a spectrophotometer, and the trace of arcs on the sample surface was observed. The results show that the functional nanoparticles can slightly improve the tensile strength and AC breakdown strength of silicone rubber composites. The composites change colour in 2 min at 250°C or 1s at 500°C, showing obvious indication traces after an electric arc passes the surface of an insulator in a short period. Still, the composites possess excellent functional properties after 1000h artificial accelerated aging test
Analysis and experiment of sintering and densification of magnesia particles
No full textMagnesia densification is essential for Mg-based refractories and materials to attain better thermal per-formance and longer service life. Few industrial-scale processes can produce magnesia with the required bulk density of above 3.40 g/cm3 (or relative density of over 95 %) from natural magnesites. The inability to achieve the desired densification is related to the low heat transfer between gas and solids inherent in large-sized greenbodies typically sintered in industrial shaft kilns. This study proposes sintering particles of 0-6 mm in primary sizes corresponding to those employed in most refractory end-products of sintered magnesia. Microstructures of the sintered particles are analyzed, and the underlying sintering mecha-nisms are discussed. The sintering of small particles can achieve over 95 % of densification at 1300- 1600 degrees C for less than 10 min. This study provides an alternative approach to producing high-density mag-nesia with the potential for substantial reductions in energy consumption and carbon emissions.(c) 2022 Elsevier Ltd. All rights reserved
A Magneto-Heated Silk Fibroin Scaffold for Anti-Biofouling Solar Steam Generation
No full textMacroscopic 3D porous materials are ideal solar evaporators for water purification. However, the limited sunlight intensity and penetrating depth during solar-driven evaporation cannot prevent the biofouling formation by photothermal effect, thus leading to the deterioration of evaporation rate. Herein, a magnetic heating strategy is reported for anti-biofouling solar steam generation based on a magnetic silk fibroin (SF) scaffold with bi-heating property. Under one sun, the solar-heated top surface of magnetic SF scaffolds accelerates water evaporation at 2.03 kg m(-2) h(-1), while the unheated inner channels suffer from the formation of biofilm. When exposed to alternating magnetic field (AMF), the magnetic SF scaffold can be integrally heated, leading to an efficient inner temperature to prevent biofouling in channels for water transportation. Accordingly, magneto-heated scaffolds show steady water evaporation rates after exposure to S. aureus and E. coli, which maintained 93.6-94.6% of original performance. In contrast, the evaporation rates of the scaffolds without AMF treatment are reduced to 1.31 (S. aureus) and 1.32 (E. coli) kg m(-2) h(-1), decreased by 35.5% and 35.0%, respectively. In addition, the magneto-heated scaffold inhibits biofouling formation in natural lake water, maintaining 99.5% original performance
Depolymerization of polyethylene terephthalate with glycol under comparatively mild conditions
No full textThe depolymerization of polyethylene terephthalate (PET) can proceed by using ethylene glycol (EG) as an alcoholysis solvent. However, high reaction temperature (>= 180 degrees C) of glycolysis process requires high energy consumption, and unfortunately results in yellowing of monomer product, i.e., bis(2-hydroxyethyl) terephthalate (BHET), limiting the production of high-quality and colorless recycled PET (rPET). To address this problem, a strategy involving acetonitrile as cosolvent was applied to decrease glycolysis temperature to 90 degrees C or even lower, and solvents as well as catalyst can be recycled and reused. The glycolysis of PET is hard to proceed at 90 degrees C. However, the swelling effect of acetonitrile caused cracks and defects on the surface of PET, which promoted the depolymerization of PET and led to an S-shaped reaction curve. Besides, adding acetonitrile could significantly accelerate the degradation of oligomers into BHET. Under the optimal reaction conditions, the conversion of PET and yield of BHET could reach 96% and 90%, respectively