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RISS 인기검색어
- 검색키워드
- 저자 : Songgeng Li (검색결과 3 건)
- 무료
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Cui Yiming,Wang Ze,Li Songgeng 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.11
The electrocatalytic reduction (ECR) of furfural (FF) for synthesis of 2-methylfuran (MF) is investigated, using a sandwich-structured electrode (NiCu/CalZIF/CP), with an inner substrate of carbon paper (CP), a surface layer of Ni-Cu bimetallic catalyst (metal layer), and a middle layer of calcined Ni-ZIF-8 (CalZIF) particles. It is found that the production rate (PR) and Faradaic efficiency (FE) of MF increase with the increase of metal loading, while the variation becomes stable in higher dosages. The FE of MF illustrates a rising-first-and-declining-later trend with the increase of current density, but in a slight degree compared with the system without CalZIF, indicating a better stability on anti-interference of current. The PR of MF increases with increasing current first and then becomes stable, which differs to the reducing trend in higher currents in the system without CalZIF. Under the optimized conditions with H2SO4 concentration of 0.2 M and current density of 12 mA·cm−2, the total FE of organics, the FE of MF, and the PR of MF, respectively reach to their maximum values of 82%, 66% and 75 µmol·cm−2·h−1, under the catalytic effects of the composite electrode with optimal Ni/Cu ratio of 0.04, metal layer loading amount of 3 mg·cm−2, and CalZIF dosage of 1 mg·cm−2. The electrode can be regenerated after re-elctrodeposition treatment. The deactivation of catalyst is found relative to the loss and agglomeration of the metals, which is resulted from the corrosion and rearrangement of the metal atoms over the electrode surface.
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In-situ hydrodeoxygenation of furfural to furans over supported Ni catalysts in aqueous solution
Ze Wang,Zhaolin Fu,Weigang Lin,Songgeng Li,Wenli Song 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.8
In-situ hydrodeoxygenation of furfural as a representative component in bio-oil was investigated in aqueous solution over supported Ni catalysts, for preparing furans as an antiknock additive. The addition of methanol, ethanol, or isopropanol was found inhibitive to coke formation at 220 oC. When using methanol as the hydrogen donor and coke inhibitor, the support in mesoporous structure with moderate acidity was more favorable to the conversion of furfural and to the formation of furans. An increased loading amount of Ni facilitated the generation of deep hydrogenated products. The conversion of furfural could hardly be changed under different methanol to water ratios, while the product distribution varied remarkably. Under optimized conditions, the summary yield of furan and 2-methylfuran reached to above 85%. On the basis of optimized reaction conditions, the in-situ hydrodeoxygenation of an eight-component synthetic bio-oil was tested, and the results verified the adaptability of the method for conversion of bio-oil.
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Catalytic pyrolysis of corn straw for deoxygenation of bio-oil with different types of catalysts
Wenkai Zhang,Ze Wang,Tengze Ge,Cuiguang Yang,Wenli Song,Songgeng Li,Rui Ma 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.5
Corn straw can be converted to bio-oil through pyrolysis. However, the application of bio-oil is severelyrestricted due to the high content of oxygen. Catalytic pyrolysis is an available way for deoxygenation of bio-oil, and thedeoxygenation reactions are strongly dependent on the type of catalyst. Whereas, the correlation between the deoxygenatedproducts and the catalyst types is still far from clear. In this work, the migration of O in the pyrolysis processwas investigated, and eight catalysts were screened for deoxygenation of bio-oil, with a lab-scale fixed-bed reactor. Theresults showed that with the increase of pyrolysis temperature, the content of O in bio-oil decreased below 400 oC andthen became stable and finally increased rapidly after 550 oC, indicating that the range of 400-550 oC was the propertemperature for deoxygenation. Eight catalysts (ZSM-5, SAPO-34, ZnO, MgO, -Al2O3, -Al2O3, acidified--Al2O3 andacidified--Al2O3) were tested, and it was found that a higher alkalinity of catalyst was favorable for decarboxylation ofbio-oil with more produced CO2, while a higher acidity was promoted the decrease of alcohols and carbonyls withmore generation of H2O and/or CO. MgO was judged as the optimal catalyst for deoxygenation of bio-oil. The qualityof bio-oil under the catalysis of MgO was best, with higher H/C and lower O/C.
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