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Zhang Y.,Kunming University of Science and Technology | Zhang Y.,Kunming Sino Platinum Metals Catalyst Co. | Wang K.,Kunming University of Science and Technology | Hu J.,Kunming University of Science and Technology
Key Engineering Materials | Year: 2012

Zirconia precursor was prepared by an alcohol-aqueous coprecipitation process from raw materials of ZrOC12·8H2O and ammonia, the zirconia powders were subsequently obtained by calcination of the precursor at 600°C and ball milling. The properties of zirconia powder prepared by alcohol-aqueous method after ball-milling had been researched by BET, XRD, TEM and laser granularity instrument. The results show that by using ball-milling the agglomerate size can be effectively decreased but the primary particle size is hardly affected. The surface area of powder after calcinated can be markedly increased and narrowed size distribution can be gained by ball-milling, but the phase structure of the powder had not been changed. © (2013) Trans Tech Publications. Source


He X.,Tianjin University | He J.,Tianjin University | He J.,Kunming Sino Platinum Metals Catalyst Co. | Meng M.,Tianjin University
Catalysis Letters | Year: 2011

A series of Ce1-x Zr x O2 (x = 0, 0.1, 0.2, 0.3) solid solution supported lean-burn NO x trap (LNT) catalysts K/LaCoO3/Ce1-x Zr x O2 were prepared by successive impregnation. After sulfation the supported perovsikte LaCoO3 was well maintained; reducing treatment partly destroyed the perovsikte, but it can be well recovered by re-oxidation treatment. Based on NO x storage and sulfur-resisting performance of the catalysts, the optimal atomic ratio of Zr in Ce1-x Zr x O2 support is x = 0.2. The catalyst K/LaCoO 3/Ce0.8Zr0.2O2 exhibits much better NO x storage capacity than the Pt-based catalyst Pt/K/Ce 0.8Zr0.2O2, which is highly related to its stronger capability for NO to NO2 oxidation. During NO x storage much larger amounts of nitrate and nitrite species were identified by in situ DRIFTS over perovskite-based catalysts than over Pt-based one. The H 2-TPR results reveal that after deep sulfation little sulfur species were deposited on the catalyst K/LaCoO3/Ce1-x Zr x O2, showing strong sulfur-resisting ability. As a result, it is thought that the full replacement of Pt by perovskite LaCoO 3 in the corresponding LNT catalysts is feasible. © 2011 Springer Science+Business Media, LLC. Source


Pan W.,Kunming Institute of Precious Metals | Zhang A.,Kunming Sino Platinum Metals Catalyst Co. | Zhao Y.,Kunming Sino Platinum Metals Catalyst Co. | Gao Y.,Kunming Sino Platinum Metals Catalyst Co.
Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering | Year: 2011

As the primary active components of automotive three-way catalysts, precious metals play an important role in purifying auto-exhaust. However, the charge of the precious metals in their precursor compounds, the bond intensities between precious metals and the ligands, the precursors solution pH values and whether other ions exist in them or not, directly influence dispersion of the precious metals on the modified material and interaction between the precursor and the material after activation treatment. Consequently they affect the performance standards of the catalyst activity, high-temperature stability, durability and so on. According to the review of the precious metals precursor researches at home and abroad, the important effects of the species and applied conditions of precious metals precursors on the catalyst performance are clarified, and it is thought that making full use of them to guide the high cost-effective catalytic material development are of great importance. Source


Liu Y.Q.,Kunming University of Science and Technology | Liu Y.Q.,Yunnan University | Zhang A.M.,Kunming Sino Platinum Metals Catalyst Co. | Qing S.,Kunming University of Science and Technology | And 3 more authors.
IOP Conference Series: Materials Science and Engineering | Year: 2015

With the intensification of the global energy crisis, the production cost of enterprises is continuously increasing because of the rising fuel prices and high requirements for environmental protection. As result, energy savings and environmental protection are vital considerations for a variety of enterprises. As a practical energy-saving technology, oxygen-enriched combustion has played a major role in energy saving and emissions reduction as its application in industrial furnaces has been popularized in recent years. This experiment was conducted in a cement rotary kiln with a capacity of 4000 t/d in a factory in China. Based on measured data in the oxygen-enriched combustion experiment, we determined the patterns of variation in the main parameters of the cement rotary kiln under oxygen-enriched production conditions. The results provide important theoretical and practical base for the cement building materials industry in energy saving and emissions reduction. Source


Gu Y.W.,Kunming University of Science and Technology | Gu Y.W.,Kunming Sino Platinum Metals Catalyst Co. | Zhang H.Y.,Kunming University of Science and Technology | Liu F.,Kunming Sino Platinum Metals Catalyst Co. | Li Y.Y.,Kunming Sino Platinum Metals Catalyst Co.
Materials Research Innovations | Year: 2015

Activated carbon was modified with γ-Al2O3 by the impregnation precipitation method, and the obtained Al2O3-AC was characterised by a surface area and pore size analyser, transmission electron microscopy and X-ray diffraction analyser. The results suggested that the content of γ-Al2O3 on the carbon surface was an important factor for the specific surface area. Transmission electron microscopy and X-ray diffraction analysis indicated that with an increase of the content of γ-Al2O3, more γ-Al2O3 wires or bars could be observed. Rosin disproportionation reaction revealed that the Pd catalyst prepared with Al2O3-AC as support had higher catalytic activity than that using the original carbon. With an increase in the content of γ-Al2O3, the maximum catalytic activity was achieved when the γ-Al2O3 content increased to 10wt-%, while the catalytic activity basically remained unchanged when the content of γ-Al2O3 varied from 10 to 15 wt-%. © W. S. Maney & Son Ltd 2015. Source

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