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Articles 1 - 6 of 6
Full-Text Articles in Entire DC Network
Exploring Large Pore Size Alumina And Silica-Alumina Based Catalysts For Decomposition Of Lignin, Sara Pourjafar, Jasmine Kreft, Honza Bilek, Evguenii Kozliak, Wayne Seames
Exploring Large Pore Size Alumina And Silica-Alumina Based Catalysts For Decomposition Of Lignin, Sara Pourjafar, Jasmine Kreft, Honza Bilek, Evguenii Kozliak, Wayne Seames
Chemical Engineering Faculty Publications
Evaluation of copper doped silica-alumina and γ-alumina catalysts for lignin decomposition was conducted using a suite of chemical analysis protocols that enabled a comprehensive characterization of the reaction product. X-ray diffraction analysis was used to verify the concentration of doped copper on catalyst supports. Then, batch experiments were performed to study the significance of catalyst support type, catalyst dopant concentration, lignin concentration, catalyst-to-lignin ratio, reactor stirring rate and reaction time. Aqueous products were extracted with dichloromethane and analyzed using a detailed gas chromatography-mass spectrophotometry analytical protocol, allowing for quantification of over 20 compounds. Solid residues were analyzed by thermogravimetric analysis …
Foam Materials With Controllable Pore Structure Prepared From Nanofibrillated Cellulose With Addition Of Alcohols, Jinbao Li, Te Song, Huijuan Xiu, Meiyun Zhang, Rui Cheng, Qiang Liu, Xuefei Zhang, Evguenii Kozliak, Yun Ji
Foam Materials With Controllable Pore Structure Prepared From Nanofibrillated Cellulose With Addition Of Alcohols, Jinbao Li, Te Song, Huijuan Xiu, Meiyun Zhang, Rui Cheng, Qiang Liu, Xuefei Zhang, Evguenii Kozliak, Yun Ji
Chemical Engineering Faculty Publications
Low-density foams based on nanofibrillated cellulose (NFC) made from Pinus massonianesoftwood pulp were prepared from NFC aqueous suspensions containing one of four C2–C4alcohols followed by freeze-drying, with the goal of controlling their pore structure and reducing the shrink rate. The foams prepared from NFC suspensions containing ethanol, isopropanol and n-butanol exhibited highly porous structures with a honeycomb-like cellular texture featuring well-defined “cell walls” between the layers. By contrast, the tert-butanol/NFC foam featured a higher number of smaller size pores with irregular shape. The foams prepared by freezing at −196 °C with ethanol also revealed small size pores, with no layered …
The Aromatization Of Propene Via Nano-Size Hzsm-5, Wayne Seames, Swapnil Fegade, Inna Sakodynskaya, Darrin Muggli, Brian Tande, Alena Kubatova, Evguenii Kozliak
The Aromatization Of Propene Via Nano-Size Hzsm-5, Wayne Seames, Swapnil Fegade, Inna Sakodynskaya, Darrin Muggli, Brian Tande, Alena Kubatova, Evguenii Kozliak
Chemistry Faculty Publications
Zeolite (ZSM) catalysts are known to convert small-size alkenes, e.g., propene, into aromatic hydrocarbons, specifically benzene, toluene and xylenes (BTX), with both high efficiency and specificity. The efficiency of conventional and hierarchical nano-size ZSM-5 for propene aromatization was compared in this study using a Design of Experiments (DOE) approach combined with detailed product analysis. Contrary to our expectations, the former showed a significantly greater BTX yield than the latter. Analysis of the obtained data by DOE and additional experiments with soybean oil cracking using both catalyst types indicated that a reason for the observed reduced activity of nano-scale zeolites may …
An Initial Study Of The Catalytic Reforming Of Crop Oil‐Derived 1‐Alkenes With Hzsm‐5 To Aromatic Hydrocarbons, Shelby Amsley‐Benzie, Swapnil Fegade, Brian Tande, Alena Kubotava, Evguenii Kozliak, Wayne Seames
An Initial Study Of The Catalytic Reforming Of Crop Oil‐Derived 1‐Alkenes With Hzsm‐5 To Aromatic Hydrocarbons, Shelby Amsley‐Benzie, Swapnil Fegade, Brian Tande, Alena Kubotava, Evguenii Kozliak, Wayne Seames
Chemical Engineering Faculty Publications
This study explored the production of aromatic hydrocarbons from the longer‐chain alkenes produced by the pyrolysis/cracking of crop oils. 1‐Tetradecene, serving as a model compound for these alkenes, was reformed in a batch reactor with a HZSM‐5 catalyst to produce a liquid hydrocarbon mixture with a high‐aromatic content. These reactions resulted in a >99% conversion of the 1‐tetradecene feedstock with a yield of up to 22 wt% of aromatic hydrocarbons. Surprisingly, isomers of C3‐substituted benzenes along with xylenes and diaromatics (lower homologs of alkyl‐substituted indanes and naphthalenes) were the main aromatic products rather than their lower‐molecular‐weight (MW) homologs, benzene, toluene, …
Kinetic Modelling And Experimental Studies For The Effects Of Fe2+ Ions On Xylan Hydrolysis With Dilute-Acid Pretreatment And Subsequent Enzymatic Hydrolysis, Hui Wei, Xiaowen Chen, Joseph Shekiro, Erik Kuhn, Wei Wang, Yun Ji, Evguenii Kozliak, Michael E. Himmel, Melvin P. Tucker
Kinetic Modelling And Experimental Studies For The Effects Of Fe2+ Ions On Xylan Hydrolysis With Dilute-Acid Pretreatment And Subsequent Enzymatic Hydrolysis, Hui Wei, Xiaowen Chen, Joseph Shekiro, Erik Kuhn, Wei Wang, Yun Ji, Evguenii Kozliak, Michael E. Himmel, Melvin P. Tucker
Chemical Engineering Faculty Publications
High-temperature (150–170 °C) pretreatment of lignocellulosic biomass with mineral acids is well established for xylan breakdown. Fe2+ is known to be a cocatalyst of this process although kinetics of its action remains unknown. The present work addresses the effect of ferrous ion concentration on sugar yield and degradation product formation from corn stover for the entire two-step treatment, including the subsequent enzymatic cellulose hydrolysis. The feedstock was impregnated with 0.5% acid and 0.75 mM iron cocatalyst, which was found to be optimal in preliminary experiments. The detailed kinetic data of acid pretreatment, with and without iron, was satisfactorily modelled …
Fiber Evolution During Alkaline Treatment And Its Impact On Handsheet Properties, Yun Ji, Yangyang Peng, Anders Strand, Shiyu Fu, Anna Sundberg, Elias Antero Retulainen
Fiber Evolution During Alkaline Treatment And Its Impact On Handsheet Properties, Yun Ji, Yangyang Peng, Anders Strand, Shiyu Fu, Anna Sundberg, Elias Antero Retulainen
Chemical Engineering Faculty Publications
To understand the swelling effects of alkaline treatment on the morphological properties of fibers and physical properties of handsheets, bleached softwood kraft pulp was treated with NaOH at different concentrations. The results showed that the fiber swelling increased, but the shrinkage and elongation of the paper at a NaOH concentration of 6% or higher did not improve. Dissolution of amorphous material occurred during the treatment together with peeling reactions. The fiber length and shape factor decreased and the fines content increased with an increasing alkali concentration. The cellulose crystallinity decreased with an increasing NaOH concentration. This was confirmed by X-ray …