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Catalytic hydrotreatment of alkaline lignin and its consequent influences on fast pyrolysis

Carbon Resources Conversion 2021年第1期4卷 219-229页

作者： Lijuan Zhang cheolyong choi Hiroshi Machida Zhibao Huo Koyo Norinaga Department of Chemical Systems Engineering Graduate School of EngineeringNagoya UniversityAichi 464-8603Japan School of Environmental Science and Engineering Shanghai Jiao Tong University800 Dongchuan RoadShanghai 200240China

The current state of lignin has been characterized by these three:(1)as one of the main components in lignocellulosic biomass with an abundant amount;(2)not be taken seriously but treated as a waste product;(3)underutilized due to a complex and stubborn ***,lignin can be a rich source for hydrocarbons and aromatic compounds when gives appropriate *** this work,we have studied the hydrotreatment of alkaline lignin(AL)under relatively mild conditions and further investigated the characterization of hydrogenated lignin(HL),especially the behavior during fast *** recovery of the HL decreased with increasing reaction temperature from 60 wt.%to 41 wt.%in the range of 150-250℃.The hydrotreated products were analyzed using Elemental Analysis,FTIR(for HL)and GC-MS(for bio-oil).The HL samples were found to have a higher hydrogen/carbon atomic effective ratio(H/C_(eff) ratio)and a higher degree of saturation than *** to the internal structure of the lignin before and after hydrotreatment,the side chain groups were removed from AL during the *** that,from the fast pyrolysis of HL,it was observed that more light hydrocarbons and aromatic compounds were formed than that of ***,fast pyrolysis in the hydrogen atmosphere revealed that more volatile fractions were released compared to the Helium *** total olefins yield was increased for HL compared AL from 1.02 wt.%to 3.1 wt.%at 250℃for 7 *** study of HL is instructive to some extent for the industrial utilization of lignin.

关键词： Alkaline lignin Hydrotreatment Hydrogenated lignin Fast pyrolysis Hydrogen atmosphere

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Continuous monitoring of char surface activity toward benzene

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Carbon Resources Conversion 2019年第1期2卷 43-50页

作者： cheolyong choi Kentaro Shima Shinji Kudo Koyo Norinaga Xiangpeng Gao Jun-ichiro Hayashi Interdisciplinary Graduate School of Engineering Sciences Kyushu University6-1Kasuga KoenKasuga 816-8580Japan Institute for Materials and Engineering Chemistry Kyushu University6-1Kasuga KoenKasuga 816-8580Japan Department of Materials Science and Engineering School of EngineeringNagoya UniversityNagoya 464-8601Japan Discipline of Electrical Engineering Energy and PhysicsSchool of Engineering and Information TechnologyMurdoch University90 South StreetMurdochWA 6150Australia Transdisciplinary Research and Education Center of Green Technology Kyushu University6-1Kasuga KoenKasuga 816-8580Japan

Kinetics of thermal decomposition of benzene on lignite-derived char was investigated at 900℃ by applying a new method to continuously monitor the char surface *** vapor was continuously forced to pass through a micro fixed bed of char with residence time as short as 7.6 ms,and then detected continuously by a flame-ionization *** showed the presence of two different types of char surfaces;consumptive Type I surface and non-consumptive(sustainable)Type II *** I surface of a partially CO_(2)-gasified char had an capacity of carbon deposit from benzene over 20 wt%-char and an initial activity(represented by a first-order rate constant)as high as 160 s−*** of them decreased with increasing carbon deposit due to consumption of micropores accessible to benzene,and finally became zero leaving Type II surface that had a very stable activity with rate constant of 4 s−*** chars without gasification had capacities of Type I surfaces smaller by two orders of magnitude than the partially gasified char,while the Type II surfaces had activities similar to that of the partially gasified *** was found that Type II surface converted benzene into not only carbon deposit but also diaromatics and even greater *** of the greater aromatics was unknown because they were deposited onto the reactor wall immediately after passing through the char bed.

关键词： Carbon deposition Aromatics Tar Char Kinetics Pyrolysis Gasification

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Effect of SiO_(2)on loss of catalysis of inherent metallic species in CO_(2)gasification of coke from lignite

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Carbon Resources Conversion 2019年第1期2卷 13-22页

作者： cheolyong choi U.P.M.Ashik Shinji Kudo Kazuya Uebo Koyo Norinaga Jun-ichiro Hayashi Interdisciplinary Graduate School of Engineering Sciences Kyushu University6-1Kasuga KoenKasuga 816-8580Japan Institute for Materials Chemistry and Engineering Kyushu University6-1Kasuga KoenKasuga 816-8580Japan Process Research Laboratories Nippon Steel&Sumitomo Metal Corporation20-1ShintomiFuttsu 293-8511Japan Department of Materials Science and Engineering School of EngineeringNagoya UniversityNagoyaAichi 464-8601Japan Transdisciplinary Research and Education Center of Green Technology Kyushu University6-1Kasuga KoenKasuga 816-8580Japan

Inherent metallic species retained by coal char or coke,such as Na and Ca,behave as catalysts in *** char/coke normally contains inherent SiO_(2),which can react with the inherent catalysts to form silicates,resulting in catalyst deactivation over the range of pyrolysis,carbonization and gasification,and thereby reducing the char/coke *** present authors simulated the inherent catalyst deactivation experimentally by blending a Victorian lignite with SiO_(2),briquetting the SiO_(2)/lignite blend,carbonizing the briquette,and then gasifying the coke with CO_(2).The kinetic analysis of the gasification employed a comprehensive model,which assumed progress in parallel of non-catalytic and catalytic *** model quantitatively described the measured kinetics of the coke gasification with different SiO_(2)contents over a range of coke conversion up to 99.9%.The kinetic analysis revealed that the SiO_(2)deactivated substantial and entire portions of the most active catalyst and its precursor,respectively,before the gasification(i.e.,during the carbonization).The catalyst deactivation also occurred during the gasification,but mainly following a self-deactivation mechanism that involved no silicates formation.

关键词： Coke Lignite Reactivity CO_(2)gasification Inherent metallic species Catalyst Deactivation SiO_(2)

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Numerical Analysis of Urea Decomposition with Static Mixers in Marine SCR System

Numerical Analysis of Urea Decomposition with Static Mixers ...

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作者： cheolyong choi Yonmo Sung Gyung Min choi Duck Jool Kim School of Mechanical Engineering Pusan National University

A numerical simulation for urea decomposition into ammonia with static mixers was performed for marine selective catalytic *** types of mixer were considered to improve urea into ammonia conversion *** effect of each mixer such as pressure drop,particle residence time,and uniform distribution of urea water solution was investigated using three dimensional CFD *** mixer regardless of a type was improved urea *** performance could be affected by high pressure drop caused by ***,the proper mixer should be chosen in permissible level of pressure drop as well as ammonia conversion rate.

关键词： Selective catalytic reduction(SCR) static mixer urea decomposition urea water solution(UWS)

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