http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Arno de Reviere,Dieter Gunst,Maarten Sabbe,An Verberckmoes 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.89 No.-
Dehydration reactions of alcohols are of prime importance in biomass conversions. Although bioalcoholsare generally obtained as mixtures, the dehydration of alcohol mixtures is barely reported. Inthis work the ability of HZSM-5 and g-Al2O3 to dehydrate a 1-butanol/ethanol mixture in a 6/1 mass-ratiowas studied, corresponding to the butanol/ethanol ratio in typical ABE mixtures, at temperatures from513 to 613 K. For HZSM-5 the difference in reactivity of the alcohols is too high to fully convert bothalcohols to their respective alkenes without catalyzing secondary reactions. For dehydration overg-Al2O3, the reactivity of ethanol and 1-butanol is more similar, which can be attributed to the lower acidstrength and larger pore size, causing lower fractional coverages and diminished competition foradsorption sites, allowing both alcohols to react more simultaneously. Above conversions of 0.6, thedifference in reactivity of both alcohols increases due to a shift in dominant reaction pathways towardsether decomposition and the intramolecular dehydration on g-Al2O3. Approaching full conversion, theselectivity towards olefins is high (>0.95) for both HZSM-5 and g-Al2O3. Since no secondary reactionsoccur when using g-Al2O3, it is deemed the best of both catalysts to dehydrate mixtures of alcoholssimultaneously to their corresponding alkenes.
Nghi Do Huu,Kellner Harald,Büttner Enrico,Huong Le Mai,Duy Le Xuan,Giap Vu Dinh,Quynh Dang Thu,Hang Tran Thi Nhu,Verberckmoes An,Diels Ludo,Liers Christiane,Hofrichter Martin 한국응용생명화학회 2021 Applied Biological Chemistry (Appl Biol Chem) Vol.64 No.5
From the biotechnological viewpoint, the enzymatic disintegration of plant lignocellulosic biomass is a promising goal since it would deliver fermentable sugars for the chemical sector. Cellobiose dehydrogenase (CDH) is a vital component of the extracellular lignocellulose-degrading enzyme system of fungi and has a great potential to improve catalyst efficiency for biomass processing. In the present study, a CDH from a newly isolated strain of the agaricomycete Coprinellus aureogranulatus (CauCDH) was successfully purified with a specific activity of 28.9 U mg− 1. This pure enzyme (MW = 109 kDa, pI = 5.4) displayed the high oxidative activity towards β-1–4-linked oligosaccharides. Not least, CauCDH was used for the enzymatic degradation of rice straw without chemical pretreatment. As main metabolites, glucose (up to 165.18 ± 3.19 mg g− 1), xylose (64.21 ± 1.22 mg g− 1), and gluconic acid (5.17 ± 0.13 mg g− 1) could be identified during the synergistic conversion of this raw material with the fungal hydrolases (e.g., esterase, cellulase, and xylanase) and further optimization by using an RSM statistical approach.