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Dwiatmoko, A.A.,Zhou, L.,Kim, I.,Choi, J.W.,Suh, D.J.,Ha, J.M. Elsevier Science Publishers 2016 Catalysis today Vol.265 No.-
<P>Five carbon materials, including multi-walled carbon nanotubes (MWCNT), carbon aerogel (CARF), carbon black (Vulcan carbon), activated carbon (AC), and graphite, were used as supports of the carbon-supported Ru catalysts, and the hydrodeoxygenation of lignin-derived monomers and lignocellulose pyrolysis oil was performed. Ru/MWCNT exhibited the highest deoxygenation activity, and the origin of the improved catalytic activity was studied. The metal dispersion, the acidity as measured by means of temperature programmed desorption, the pore structure, and the surface area were investigated in an effort to understand the catalysis results. We observed that the quantity of accessible Ru nanoparticles on the mesopores determined the hydrodeoxygenation activity. (C) 2015 Elsevier B.V. All rights reserved.</P>
Hydrodeoxygenation of guaiacol on tungstated zirconia supported Ru catalysts
Dwiatmoko, Adid Adep,Kim, Inho,Zhou, Lipeng,Choi, Jae-Wook,Suh, Dong Jin,Jae, Jungho,Ha, Jeong-Myeong Elsevier 2017 Applied Catalysis A Vol.543 No.-
<P><B>Abstract</B></P> <P>Ru nanoparticles supported on tungstated zirconia (WZr) were prepared and used for the catalytic hydrodeoxygenation of guaiacol to deoxygenated hydrocarbon fuels. The tuning of tungsten, from 5 to 20wt%, adjusted the number of acid sites on the tungstated zirconia and the size of the Ru nanoparticles. The optimum fraction of tungsten was determined for the optimum hydrodeoxygenation activity. The conversion of guaiacol reached a maximum of 96.8% for 10wt% of tungsten. Increasing the tungsten fraction increased the number of acid sites and the dispersion of Ru, but the formation of tungsten oxide (WO<SUB>x</SUB>) particles with too large fraction of tungsten inhibited the formation of smaller Ru nanoparticles, thus reducing the catalytic activity.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Ru nanoparticles supported on tungsten-added zirconia. </LI> <LI> Hydrodeoxygenation of guaiacol using Ru/W/ZrO<SUB>2</SUB> bifunctional catalyst. </LI> <LI> Catalytic activity depending on the Ru particle size. </LI> <LI> Ru particle size depending on the combination of acidity and WO<SUB>x</SUB> particles. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Kim, I.,Dwiatmoko, A.A.,Choi, J.W.,Suh, D.J.,Jae, J.,Ha, J.M.,Kim, J.K. Korean Society of Industrial and Engineering Chemi 2017 Journal of industrial and engineering chemistry Vol.56 No.-
<P>Using a continuous flow reactor, bio-oil prepared by the pyrolysis of sawdust was upgraded to produce petroleum-like deoxygenated hydrocarbon fuels. Dispersed tiny bio-char particles in the raw bio-oil were removed by extraction using diethyl ether to suppress solid-particle-nucleated coking. Noble metal catalysts, instead of molybdenum-based catalysts, were selected to avoid the continuous addition of sulfur compounds. Among the catalysts, tungstate-zirconia-supported Ru catalysts (Ru/WZr) exhibited high hydrodeoxygenation activity and less formation of cokes, which characteristics are important in the development of feasible upgrading processes. The investigation of catalysts used in this study demonstrates that the larger quantity of Bronsted acid sites compared to Lewis acid sites suppresses the formation of cokes. (C) 2017 Published by Elsevier B.V. on behalf of The Korean Society of Industrial and Engineering Chemistry.</P>
Yati, I.,Dwiatmoko, A.A.,Yoon, J.S.,Choi, J.W.,Suh, D.J.,Jae, J.,Ha, J.M. Elsevier 2016 Applied Catalysis A Vol.524 No.-
<P>Al2O3-cogelled Ru nanoparticle (Ru@Al) catalyst was prepared by a one-pot in-situ alumina gelation method using a PVP-stabilized Ru colloid solution. The Ru@Al catalyst exhibited excellent catalytic activity during the liquid-phase hydrodeoxygenation of vanillin, demonstrating 100% conversion, as well as significantly higher yields of fully deoxygenated compounds compared to other conventional alumina supported Ru catalysts. We also observed better selectivity to deoxygenated dimers with the Ru@Al catalyst. The improved catalytic selectivity was attributed to the hypothesized three-dimensional structures of Al2O3 surrounding the Ru nanoparticles, which improved the two-step reaction, containing the dimerization of the phenolic compounds and the hydrodeoxygenation of phenolic dimers to produce deoxygenated high-carbon-number hydrocarbons. (C) 2016 Elsevier B.V. All rights reserved.</P>
Catalytic Depolymerization of Alkali Lignin Using Supported Pt Nanoparticle Catalysts
Sanyoto, Bernardi,Dwiatmoko, Adid Adep,Choi, Jae-Wook,Ha, Jeong-Myeong,Suh, Dong Jin,Kim, Chang Soo,Lim, Jong-Choo American Scientific Publishers 2016 Journal of Nanoscience and Nanotechnology Vol.16 No.5
<P>Alkali lignin, a byproduct of the pulping process, was depolymerized using Pt nanoparticle catalysts. A depolymerized lignin with a lower molecular weight was obtained and characterized with GPC and NMR. P-31-NMR using OH-sensitive probing molecules showed the formation of guaiacyl OHs during the reaction, indicating the cleavage of guaiacyl ether bonds.</P>
Sanyoto, Bernardi,Dwiatmoko, Adid Adep,Choi, Jae-Wook,Ha, Jeong-Myeong,Suh, Dong Jin,Kim, Chang Soo,Lim, Jong-Choo American Scientific Publishers 2016 Journal of Nanoscience and Nanotechnology Vol.16 No.5
<P>Aromatic hydrocarbons were produced from lignin, a complex natural amorphous polymer commonly regarded as by-product of the pulping process and from biofuel production. The catalytic decomposition of lignin using supported Pt catalysts was performed to produce small molecule hydrocarbons. Aromatic small-molecule hydrocarbon products were identified and quantified using GC/MS and GC-FID, which demonstrated that 27.6% of aromatic hydrocarbons were obtained from the activated carbon-supported Pt (Pt/AC) catalyst which had the highest Pt surface area.</P>
김인호,Adid Adep Dwiatmoko,최재욱,서동진,제정호,하정명,김재곤 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.56 No.-
Using a continuousflow reactor, bio-oil prepared by the pyrolysis of sawdust was upgraded to producepetroleum-like deoxygenated hydrocarbon fuels. Dispersed tiny bio-char particles in the raw bio-oil wereremoved by extraction using diethyl ether to suppress solid-particle-nucleated coking. Noble metalcatalysts, instead of molybdenum-based catalysts, were selected to avoid the continuous addition ofsulfur compounds. Among the catalysts, tungstate-zirconia-supported Ru catalysts (Ru/WZr) exhibitedhigh hydrodeoxygenation activity and less formation of cokes, which characteristics are important in thedevelopment of feasible upgrading processes. The investigation of catalysts used in this studydemonstrates that the larger quantity of Brønsted acid sites compared to Lewis acid sites suppresses theformation of cokes.