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- 저자 : Guozhi Fan (검색결과 3 건)
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Ligandless palladium supported on SiO2–TiO2 as effective catalyst for Suzuki reaction
Guozhi Fan,Bing Zou,Siqing Cheng,Lihui Zheng 한국공업화학회 2010 Journal of Industrial and Engineering Chemistry Vol.16 No.2
TiO2–SiO2 mixed oxides were prepared by the homogeneous precipitation method, and the supports were characterized by XRD, IR and BET. Ligandless palladium supported on SiO2–TiO2 was prepared by the deposition–precipitation method and used as recoverable catalyst for Suzuki reactions. The results revealed that the supported catalyst Pd/SiO2–TiO2 exhibited excellent catalytic activity for the coupling of aryl bromides with arylboronic acid, and also exhibitedmoderate catalytic activity for the coupling of aryl chlorides. The catalyst was recycled by simple filtration and reused without further disposal, no significant Pd leaching and loss of catalytic activity was observed except the first reuse.
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Yu Bowei,Fan Guozhi,Zhao Sijiu,Lu Yuchan,He Qiao,Cheng Qunpeng,Yan Juntao,Chai Bo,Song Guangsen 한국응용생명화학회 2021 Applied Biological Chemistry (Appl Biol Chem) Vol.64 No.1
Convertible cellulose and lignin were simultaneously isolated from wheat straw using a two-stage process via simply varying temperature and H2SO4 concentration. At the first-stage, cellulose was obtained by pretreating wheat straw at lower temperature and acid concentration using an organosolv process. The purity, yield and recovery rate of cellulose reached 86.8 wt%, 55.2 and 92.8% at 150 °C with 1 wt% H2SO4. At the second stage, the residual liquid was further treated at higher temperature and acid concentration, giving 17.4% lignin yield with 86.6% recovery rate and 93.2 wt% purity at 180 °C with 1.5 wt% H2SO4. The conversion of the as-isolated cellulose and lignin into chemicals was further investigated. The total yield of 5-hydroxymethylfurfural and glucose derived from wheat straw cellulose reached 82.5%, and 18.3% yield of monophenolic compounds from lignin were obtained, respectively. These results indicated that the two-stage process was effective for obtaining high-quality cellulose and lignin from wheat straw. Both of them displayed excellent convertible property.
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Catalytic transfer hydrogenation of furfural to furfuryl alcohol over Al-containing ferrihydrite
Wenhai Chen,Qiao Peng,Guozhi Fan,Qunpeng Cheng,Min Tu,Guangsen Song 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.119 No.-
Al-containing ferrihydrite (Fh-Al) was prepared by co-precipitation method using ferric nitrate nonahydrateand aluminum nitrate nonahydrate as precursors. The prepared Fh-Al was systematically characterizedand then employed for the catalytic transfer hydrogenation (CTH) of furfural (FUR) to furfurylalcohol (FOL). The influence of precipitant type, hydrogen donor, the molar ratio of Fe to Al, catalystamount, reaction time and reaction temperature were investigated. It was found that Fh-Al with 1:2molar ratio of Fe to Al was amorphous with acidic and basic sites, and the largest specific surface areaof 303 m2/g was obtained using NaOH and Na2CO3 as the co-precipitator. Fh-Al with 1:2 molar ratio ofFe to Al possessed excellent catalytic performance and stability. The conversion of FUR, the yield andthe selectivity of FOL reached 100 % at 150 C for 5 h using isopropanol as the hydrogen donor. Moreover, only slight decrease in the catalytic performance was observed during the recycle. After 4cycles, the conversion of FUR, the selectivity and the yield of FOL still reached 99.1 %, 99.7 % and98.8 %, respectively. A plausible reaction mechanism for the CTH of FUR to FOL was also proposed, inwhich both acidic and basic sites play roles.
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