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- 저자 : Linhuo Gan (검색결과 2 건)
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Jundong Zhu,Linhuo Gan,Baoxia Li,Xin Yang 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.1
Three kinds of solid acid catalysts were prepared from alkali lignin in the waste liquor of pulping using carbonation- sulfonation method with different pretreatment. The lignin-derived solid acids (LDSAs) were characterized by FESEM, XRD, FTIR, TGA, BET and acid-base titration, respectively. A comparison study on the catalytic performance of LDSA prepared by different pretreatment method before carbonation in the hydrolysis of microcrystalline cellulose (MCC) was carried out. Results showed that the LDSA prepared by chemical activation with phosphoric acid (LPC-SO3H) exhibited superior catalytic activity due to its higher densities of -COOH group (1.68mmol/g) as binding site and -SO3H group (0.88mmol/g) as catalytic site as well as its larger specific surface area (488.4m2/g) than those of the other two LDSAs. A total reducing sugar yield of 50.8% in MCC hydrolysis was obtained under the reaction conditions of temperature of 180 oC, time of 3 h, MCC concentration of 6mg/mL and mass ratio of catalyst to MCC of 3.3 (w/w). Additionally, the value activation energy for hydrolysis of MCC to reducing sugars using LPC-SO3H was 83.31 kJ/mol, which was smaller than that using sulfuric acid.
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Shuai Wang,Li Lyu,Guobao Sima, Ying Cui,Ying Cui,Baoxia Li,Xueqin Zhang,Linhuo Gan 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.7
A sulfonated lignin-derived mesoporous carbon (LDMC-SO3H) was prepared from kraft lignin (KL) using phenolation and soft-template method followed by sulfonation. LDMC-SO3H bearing a sulfonic acid density of 0.65 mmol/g possessed a well-ordered 2D hexagonal mesoporous characteristics with mesopore volume of 0.067 cm3/g and specific surface area of 262m2/g as well as mesopore size of 3.42 nm. A high 5-hydroxymethylfurfural (5-HMF) yield of 98.0% with a full fructose conversion was obtained using LDMC-SO3H as catalyst under the optimized reaction conditions of reaction temperature and time of 140 oC and 120 min, initial fructose concentration of 100 g/L, catalyst load of 0.1mg/mg in DMSO. Furthermore, there was no obvious decrease in 5-HMF yield (95.0%) within the fivecycle experiment, highlighting the superior reusability and stability of LDMC-SO3H in fructose-to-5-HMF transformation.
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