News Column

Investigators at Dalian University of Technology Describe Findings in Mineralogy

June 20, 2014

By a News Reporter-Staff News Editor at Mining & Minerals -- Research findings on Mineralogy are discussed in a new report. According to news reporting originating in Dalian, People's Republic of China, by VerticalNews journalists, research stated, "Consisted of closely packed nanoflakes,gamma-Al2O3 hollow microspheres with ca. 4-6 mu m in diameter, and 500-700 nm in shell thickness have been hydrothermally synthesized through utilizing Al(NO3) (3)center dot 9H(2)O as precursor, urea as precipitant agent and sulfate K2SO4, (NH4)(2)SO4, or KAl(SO4)(2)center dot 12H(2)O as additive, followed by a calcination step. The samples were further characterized by thermogravimetric analysis, scanning electron microscope, x-ray powder diffraction, nitrogen adsorption, and in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) of adsorbed CO etc."

The news reporters obtained a quote from the research from the Dalian University of Technology, "The morphology of alumina products was strongly dependent on the presence of SO42-. Then via a deposition-precipitation method, 3 wt.% Au nanoparticles supported on gamma-Al2O3 hollow microspheres exhibit excellent performance with a complete CO conversion at 0 degrees C (T-100% = 0 degrees C) and 50 % conversion at -25 degrees C (T-50%=-25 degrees C). The good catalytic activity is associated with the special hollow microsphere structures assembled by nanoflakes of gamma-Al2O3 support. The DRIFTS confirms the presence of Au delta(+) and Au-0 on the surface of gamma-Al2O3 hollow microspheres."

According to the news reporters, the research concluded: "As a contrast, Au catalyst prepared using alumina support with undefined morphology shows low activity under the same catalytic test conditions (T-100% = 190 degrees C, T-50% = 80 degrees C)."

For more information on this research see: Hollow gamma-Al2O3 microspheres as highly "active" supports for Au nanoparticle catalysts in CO oxidation. Gold Bulletin, 2014;47(1-2):95-101. Gold Bulletin can be contacted at: Springer Heidelberg, Tiergartenstrasse 17, D-69121 Heidelberg, Germany. (Springer -; Gold Bulletin -

Our news correspondents report that additional information may be obtained by contacting J. Wang, Dalian University of Technology, Sch Chem Engn, State Key Lab Fine Chem, Dalian 116024, People's Republic of China. Additional authors for this research include Z.H. Hu, Y.X. Miao and W.C. Li.

Keywords for this news article include: Asia, Dalian, Mineralogy, People's Republic of China

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Source: Mining & Minerals

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