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RISS 인기검색어
- 검색키워드
- 저자 : Chunbao Charles Xu (검색결과 3 건)
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Mingcun Wang,Mathew Leitch,Chunbao Charles Xu 한국공업화학회 2009 Journal of Industrial and Engineering Chemistry Vol.15 No.6
For the synthesis of biomass-based resol resins, cornstalk powders were liquefied in a hot-compressed phenol–water (1:4, wt./wt.) medium at 300–350 8C. It was observed that essentially no phenol was reacted with the cornstalk degradation intermediates during the liquefaction process. The cornstalkderived bio-oils contained oligomers of phenol and substituted phenols, originated primarily from the lignin component of the cornstalk feedstock. Using the cornstalk-derived bio-oils, resol resins were readily synthesized under the catalysis of sodium hydroxide. The biomass-derived resol resins were brown viscous liquids, possessing broad molecular weight distributions. In comparison with those of a conventional phenol resol resin, the properties of the bio-based resins were characterized by GPC, FTIR, DSC and TGA. The as-synthesized bio-oil resol resin exhibited typical properties of a thermosetting phenol–formaldehyde resin, e.g., exothermic curing temperatures at about 150–160℃, and an acceptable residual carbon yield of ca 56% at 700℃ for the cured material.
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Sadra Souzanchi,Laleh Nazari,Kasanneni Tirumala Venkateswara Rao,Zhongshun Yuan,Zhongchao Tan,Chunbao Charles Xu 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.101 No.-
This work aimed to produce 5-hydroxymethylfurfural (5-HMF) from glucose in a biphasic continuousflowtubular reactor with various heterogeneous solid acid catalysts or combined solid acid-base catalysts. Among the catalysts tested, niobium phosphate (NbP) was found to be the most active catalystfor glucose dehydration with a maximum 5-HMF yield of 45% at 150 C. The higher activity of NbPwas attributed to its higher total number of acid sites and BET surface area, as well as the presence of bothLewis acid and Brønsted acid sites. The effects of different operating conditions such as aqueous toorganic (A/O) phase ratio, reaction temperature and feeding flow rate on the activity of some selected catalystswere studied. Reducing A/O ratio by increasing the extracting organic phase flow rate and increasingthe reaction temperature (up to 150 C) were found to positively affect 5-HMF production fromglucose in the presence of NbP. Kinetics study demonstrated that the overall reaction of glucose dehydrationto 5-HMF over the NbP catalyst is a first-order reaction with the reaction rate constants (k) determinedas 0.06, 0.21 and 0.6 min 1 at 110, 130 and 150 C, respectively, and the apparent activationenergy (Ea) calculated to be 77 kJ/mol.
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Aristide Laurel Mokale Kognou,Chonlong Chio,Janak Raj Khatiwada,Shrestha Sarita,Xuantong Chen,Yuen Zhu,Rosalie Anne Ngono Ngane,Gabriel Agbor Agbor,Zi-Hua Jiang,Chunbao Charles Xu,Wensheng Qin 한국생물공학회 2023 Biotechnology and Bioprocess Engineering Vol.28 No.2
Coculture and whole-cell immobilization have myriad industrial applications for enhancing enzyme production. Using pretreated wheat straw as the sole carbon source, improving glucose isomerase production and cell growth by synthetic bacterial consortia was investigated. Thirteen cocultures were constructed based on the performance and antagonistic activities of monocultures from six cellulolytic soil bacteria. The performance of monocultures immobilized with calcium alginate was also tested. Only five cocultures (A, B, C, G and J) exhibited cell growth and enzyme production synergies. The highest level of synergism (15.17 U/mL) was found in coculture J composed of Mycobacterium sp. MKAL3 (4.06 U/mL) and Stenotrophomonas sp. MKAL4 (3.37 U/mL) with a synergism degree of 2.04. The synergism was unique to growth on wheat straw as it was completely absent in xylose-grown cocultures. The wheat straw degradation synergism could rely on specific compounds released by the MKAL3 strain that promote the activity of the MKAL4 strain and vice versa. However, immobilized strains MKAL1, MKAL2, MKAL3, MKAL4 and MKAL5 improved glucose isomerase production in the wheat straw fermentation process at different sodium alginate concentrations. Immobilization studies of purified glucose isomerases for hydrolysis and saccharification of wheat straw are now being conducted.
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