Solvothermal synthesis and upconversion emission of monodisperse ultrasmall SrYbF5 nanocrystals

Gong, Lunjun; Yang, Jicheng; Li, Yuyu; Ma, Minglong; Xu, Cheng; Ren, Guanhua; Lin, Jianguo; Yang, Qibin

doi:10.1007/s10853-013-7163-6

Cited by 6 publications

(2 citation statements)

References 41 publications

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“…Details of the synthesis protocol are provided in the Text S1. The modified limestone was subsequently calcined for 0.5 h in N 2 at 850 °C, and characterized with regards to (i) surface morphology using scanning electron microscopy (SEM), (ii) surface area and pore volume using N 2 adsorption apparatus and mercury injection apparatus, (iii) chemical composition and crystal structure using X-ray powder diffraction (XRD) (the crystal structure was obtained by the whole pattern fitting and Rietveld (WPFR) refinement method with the Jade 6.0 software. , ), and (iv) thermal decomposition and SO 2 capture performance using a thermogravimetric analyzer (TGA). Details of the equipment and method used for particle characterization are given in the Text S2.…”

Section: Methodsmentioning

confidence: 99%

Trace Na₂CO₃ Addition to Limestone Inducing High-Capacity SO₂ Capture

Han

Sun

Gao

et al. 2017

Environ. Sci. Technol.

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Although the literature has reported enhanced indirect sulfation of limestone by adding NaCO, the amount of NaCO additive required to achieve high CaO conversion is typically high (∼4.0 mol %), which commonly results in adverse effects in fluidized-bed combustion boiler systems and increased cost of sorbents. In this work, we demonstrate for the first time that trace NaCO (0.1 mol %) can significantly enhance the sulfate conversion of limestone. This enhanced sulfation is attributed to the increased surface area and optimized pore size distribution. The trace NaCO additive splits the pores of the original sorbents peaking at ∼70 nm into pores peaking at ∼4 nm and ∼140 nm due to the slight promotion of sintering. This well-developed pore structure results in a relatively high reactivity for sulfation. Thus, the NaCO additive influences the sorbent reactivity in two ways: (1) at less than 0.5 mol %, tuning its pore structure; (2) at more than 0.5 mol %, promoting the product layer diffusion. We also find that trace amount of other metal salts, such as CaCl and NaCl, clearly enhance the sulfation of limestone. The strategy of enhancing limestone sulfation by the addition of trace amount of metal salts offers evident engineering and economic advantage.

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Section: Methodsmentioning

confidence: 99%

Trace Na₂CO₃ Addition to Limestone Inducing High-Capacity SO₂ Capture

Han

Sun

Gao

et al. 2017

Environ. Sci. Technol.

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show abstract

“…There are few reports on ultra-small upconversion nanoparticles, especially those below 5 nm. [172][173][174][175][176][177] Herein we mainly introduce the fundamentals of up-conversion nanoparticles and the progress in preparation and imaging application of ultra-small nanoparticles.…”

Section: Ultra-small Up-conversion Nanocrystalsmentioning

confidence: 99%