tailieunhanh - báo cáo hóa học: " Gold nanoparticles supported on magnesium oxide for CO oxidation"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Gold nanoparticles supported on magnesium oxide for CO oxidation | Carabineiro et al. Nanoscale Research Letters 2011 6 435 http content 6 1 435 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Gold nanoparticles supported on magnesium oxide for CO oxidation c A I S A in n I I r r 1I I I V X o I s V X r n I I -XX n2 A n D xrtn n I -XX ĩ3 D J X I r o I n r xr4 I 1 r G í ì vs n zxr4 n vs n Sonia AC Carabineiro Nina DogaancniKova Alexey Pestryakov Pedro D Tavares Lisete SG Fernandes ana José L Figueiredo1 Abstract Au was loaded 1 wt on a commercial MgO support by three different methods double impregnation liquidphase reductive deposition and ultrasonication. Samples were characterised by adsorption of N2 at -96 C temperature-programmed reduction high-resolution transmission electron microscopy energy-dispersive X-ray spectroscopy and X-ray diffraction. Upon loading with Au MgO changed into Mg OH 2 the hydroxide was most likely formed by reaction with water in which the gold precursor was dissolved . The size range for gold nanoparticles was 2-12 nm for the DIM method and 3-15 nm for LPRD and US. The average size of gold particles was nm for DIM and larger than for the other methods. CO oxidation was used as a test reaction to compare the catalytic activity. The best results were obtained with the DIM method followed by LPRD and US. This can be explained in terms of the nanoparticle size well Known to determine the catalytic activity of gold catalysts. Introduction It is well known from the literature that for gold to be active as a catalyst a careful preparation is needed to obtain nanoparticles well dispersed on the support 1-4 . Compared with other supports MgO is considered as inactive 5-8 since it is basically an irreducible oxide such as Al2O3. These materials have low ability to adsorb or store oxygen at low temperatures 5 . However Margitfalvi et al. 9 prepared Au MgO catalysts with high activity for low temperature CO oxidation. The activity of these catalysts was

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