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Dingkun Yuan,Kang Zhang,Lijian Wang,Lingfeng Jin,Xutao Guo,Guangxue Zhang 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.103 No.-
Biomass is carbon-neutral and has the carbon-negative potential if combined with carbon capture andstorage (CCS). This study investigated the thermochemical conversion to high-purity hydrogen of a typicallignite (BYH) and seaweed biomass (BS) with carbon capture in a designed fixed-bed reactor at moderateconditions (1 atm, 873 K). High-purity hydrogen of 486.91–801.5 ml/g-blends with suppressed CO2formation was produced in the alkaline gasification. The alkali can decompose the coal/biomass molecularstructures, in-situ capture CO2 and control the gases to high-purity H2 (80.1%–93.2%). The synergisticeffect of coal and biomass changes the gas evolution behaviors and impacts the chemical structures of thechar. The abundant SiO2 and Al2O3 in the coal can inhibit the catalytic activities of earth alkali metals inthe biomass, but not much. These results are significant to the future development of low-carbon renewableenergy techniques.
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Xu, Tao,Yuan, Rui,Xu, Peng-Cheng,Pan, Dong-Jie,Yang, Woochul,Guo, Hai-Bo,Shen, Yu-Fang,Hu, Jian-Feng,Zhang, Zhi-Jun,Zhao, Jing-Tai Elsevier 2018 Journal of alloys and compounds Vol.762 No.-
<P><B>Abstract</B></P> <P>Uniform, monodisperse yttrium aluminum garnet (YAG) rhombic dodecahedron micro-crystals were synthesized using coprecipitation and hydrothermal methods. The Na<SUB>2</SUB>SO<SUB>4</SUB> as a surfactant was helpful in improving the dispersity of the crystallites and forming well-faceted, micro-sized dodecahedral YAG crystallites. The effect of the reaction time and the solvent has also been studied. The crystal growth mechanism called dissolution/crystallization was determined by analyzing the experimental and simulated results. And the specific well-developed crystal facets in the {110} family have been demonstrated by the theoretical calculation. A higher integrated emission intensity can be achieved for the YAG:Ce crystallites by improving the phase purity, morphology with better developed dodecahedrons, and dispersion. Furthermore, a rather high luminous efficacy (LE = 104.14 lm/W) for the white LED fabricated using the YAG:Ce<SUP>3+</SUP> phosphor prepared in this work was realized. The correlation between the crystal growth, morphology and luminescence properties of YAG crystallites has been established, which exhibits a great importance for the synthesis and application of mono-dispersed YAG crystallites.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Uniform and monodisperse YAG rhombic dodecahedron micro-crystals were synthesized. </LI> <LI> The growth mechanism of YAG rhombic dodecahedron was studied through experimental and computational simulation. </LI> <LI> The correlation between the crystal growth, morphology and luminescence of YAG crystallites was established. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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