Institutional Repository of Institute of Process Engineering, CAS (IPE-IR）
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Fabrication of Hierarchical Porous Metal Oxides by the HPMC- Assisted Gel Combustion Strategy: Incorporation of Nanoceria into Cookie-like Mn2O3 with Enhanced Oxidation Activity and Excellent Water Resistance
No full textConstructing nonprecious metal oxide catalysts with a hierarchical porous structure by a simple method for the deep catalytic oxidation of toxic volatile organic compounds at low temperatures is of great value and significance. In this work, a porous manganese trioxide catalyst (Mn2O3-H) was prepared by a hydroxypropyl methylcellulose-assisted combustion synthesis strategy for catalytic complete oxidation of gaseous toluene. Benefiting from the rich porous nanostructure, Mn2O3-H has much higher specific surface area and active site density, resulting in better low-temperature reducibility and oxygen activation ability than blank Mn2O3 formed by direct calcination. With this sol-gel combustion process, CeO2 nanoparticles could be successfully introduced to form cookie-like Ce-Mn composite oxide with a hierarchical porous nanostructure, which builds the strong interaction of CeO2- Mn2O3 to weaken Mn-O with more active defects. Among Ce-doped catalysts, 5% CeMn-H shows the best catalytic activity in toluene oxidation with 90% conversion temperature at 242 degrees C under a weight hour space velocity of 60,000 mLmiddotg-1middoth-1, which is about 30 and 133 degrees C lower than that of Mn2O3-H and Mn2O3-B, respectively. This advantage is also shown in other typical hydrocarbons such as propylene and propane. Moreover, the as-prepared Ce-doped catalyst exhibits excellent stability and water resistance ability. This simple robust sol-gel combustion method will provide valuable enlightenment for designing porous catalysts with high performance for related catalytic reactions
Data-driven identification of coherent structures in gas-solid system using proper orthogonal decomposition and dynamic mode decomposition
No full textSpatiotemporal coherent structures are critical in quantifying the hydrodynamics of dense gas-solid flows. In this study, two data-driven methods, proper orthogonal decomposition (POD) and dynamic mode decomposition (DMD), are applied to identify and characterize the dominant spatiotemporal coherent structures in a bubbling fluidized bed. It is found that (i) with the same number of modes (or coherent structures), POD captures more defined energy than DMD; (ii) the main coherent structure of POD is symmetric and confirms the existence of bubble-emulsion two-phase structure; (iii) the coherent structures with a frequency of 0 Hz in DMD analysis can construct the mean flow field more reasonably than POD; and (iv) POD reconstructs the transient flow fields more accurately with the same number of modes. This study offers insights into the coherent structures in gas-solid systems
Key Program for International S T Cooperation Projects of China~from the Ministry of Science and Technology of China
No full textMulti-process and multi-pollutant control technology for ultra-low emissions in the iron and steel industry
No full textThe iron and steel industry is not only an important foundation of the national economy, but also the largest source of industrial air pollution. Due to the current status of emissions in the iron and steel industry, ultra-low pollutant emission control technology has been researched and developed. Liquid-phase proportion control technology has been developed for magnesian fluxed pellets, and a blast furnace smelting demonstration project has been established to use a high proportion of fluxed pellets (80%) for the first time in China to realize source emission reduction of SO2 and NOx. Based on the characteristics of high NOx concentrations and the coexistence of multiple pollutants in coke oven flue gas, low-NOx combustion coupled with multi-pollutant cooperative control technology with activated carbon was developed to achieve efficient removal of multiple pollutants and resource utilization of sulfur. Based on the characteristics of co-existing multiple pollutants in pellet flue gas, selective non-catalytic reduction (SNCR) coupled with ozone oxidation and spray drying adsorption (SDA) was developed, which significantly reduces the operating cost of the system. In the light of the high humidity and high alkalinity in flue gas, filter materials with high humidity resistance and corrosion resistance were manufactured, and an integrated pre-charged bag dust collector device was developed, which realized ultra-low emission of fine particles and reduced filtration resistance and energy consumption in the system. Through source emission reduction, process control and end-treatment technologies, five demonstration projects were built, providing a full set of technical solutions for ultra-low emissions of dust, SO2, NOx, SO3, mercury and other pollutants, and offering technical support for the green development of the iron and steel industry. (c) 2022 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V
Rational construction of multiple hollow silicalite-1 zeolite with enhanced quasi acidity for robust vapor-phase Beckmann rearrangement
No full textDeveloping efficient and stable zeolites for vapor-phase Beckmann rearrangement of cyclohexanone oxime is still a great challenge to realize epsilon-caprolactam (CPL) green production. In this work, the hierarchical porous silicalite-1 zeolites with multiple hollow structure (S-1-M) are explored by in-situ desilication-recrystallization post-treatment of spongy highway-like zeolites (S-1-S), which are synthesized through silanization synthesis of conventional bulky silicalite-1 (S-1). Compared to S-1, S-1-M achieves superior catalytic performance, with improving the CPL selectivity from 85.7% to 94.1% and prolonging the catalyst lifetime from 74 to 126 h at a weight hourly space velocity (WHSV) of 6 h(-1). Comprehensive physiochemical studies demonstrate that the highly dispersed intracrystalline cavities within S-1-M endow greater mass diffusion and better quasi acidity inducing by the enhanced H-bonds among abundant H-bonded silanols, which is cooperatively responsible for its superior catalytic performance
A*STAR under the Advanced Manufacturing and Engineering (AME) programmatic fund[A20H3g2140]
No full textPhytochemical analysis and bioactivity of different ethanolic extracts from cannabidiol full-spectrum oil
No full textIndustrial hemp is an important economic crop. The extract of its leaves is well-known as cannabidiol full-spectrum oil (CFSO) and has great application potential. But the chemical composition of CFSO is still not clear, which limits its efficient application. Therefore, this work aimed to explore the phytochemical profile and composition-activity relationship of CFSO. The results showed that a total of 12 cannabinoids were identified by HPLC-ESI-MS and they were CBD-C1, CBGVA, CBGA, CBGV, CBDVA, CBG, CBDV, CBDA, CBD, CBD-C4, CBN, and CBT. CBD (559.3 mg/g) was the most abundant component, followed by CBDV (302.4 mg/g) and CBN (31.7 mg/g). Besides, the content of CBDV, CBD, and CBN of different polar extracts increased with the rise of ethanol concentration. The TPC and TFC of the extracts also increased with the rise of ethanol concentration. The extract of 90 % EtOH had the highest TPC (949.21 +/- 2.37 mg GAE/g extract) and TFC (267.05 +/- 1.21 mg RE/g extract) while the extract of 0 % EtOH displayed the lowest TPC (244.89 +/- 2.13 mg GAE/g extract) and TFC (46.26 +/- 0.85 mg RE/g extract). Furthermore, as ethanol concentration increased, the cytotoxicity, antioxidant, and antibacterial activities of the extracts had a significant increasing trend. And the correlation analysis demonstrated that the antioxidant activity and cytotoxicity of the extracts were closely related with the phenolic compounds and flavonoids, especially cannabinoids. These findings could provide data support for the application of CFSO. (c) 2022 Elsevier B.V. All rights reserved
