Topic
Mixed oxide
About: Mixed oxide is a research topic. Over the lifetime, 5224 publications have been published within this topic receiving 115567 citations.
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TL;DR: In this article, the performance of spinel-like Co-Mn-Mg-Al mixed oxide spinel catalysts was examined in CO oxidation by O 2, and the prepared catalysts were characterized by chemical analysis (ICP), infrared spectroscopy (FTIR), thermal analysis (TG, DTG), powder X-ray diffraction (XRD), surface area measurements, and scanning electron microscopy (SEM).
40 citations
TL;DR: In this article, the incorporation of Al 2 O 3 -ZrO 2 mixed oxide composite in the zinc galvanic coating was achieved by the improvement of corrosion resistance and wear resistance.
40 citations
TL;DR: In this article, the catalysts were characterized by XRD, H2 TPR, and XPS techniques and the Cr−O catalyst was more active than Cr−V−O mixed oxide in the selective oxidation of ethane using O2 or CO2 as the oxidant.
Abstract: Oxidative dehydrogenation of ethane to ethylene was investigated at temperatures below 500 °C over Cr−O and Cr−V−O oxide catalysts prepared by the complexation method. The catalysts were characterized by XRD, H2 TPR, and XPS techniques. The Cr−O catalyst was more active than Cr−V−O mixed oxide in the selective oxidation of ethane using O2 or CO2 as the oxidant. Cr−O showed activity at temperatures as low as 250 °C. TPR results showing easier reduction of Cr−O at much lower temperatures than Cr−V−O support a correlation between the reducibility and the activity of the catalysts in this reaction. XPS results indicating the reduction of chromium and vanadium species from Cr6+ to Cr3+ and from V5+ to V4+ (and V3+) support a redox mechanism for this oxidative dehydrogenation reaction. Over Cr−O catalyst, total conversion and ethylene selectivity values of 0.11 and 0.91 were obtained, respectively, at 250 °C for an O2/C2H6 feed ratio of about 0.33 and at a space time of 0.24 g s/cm3. With this catalyst, the eth...
40 citations
TL;DR: Combinatorial libraries of the mixed oxide system Cu1−xCexO3 (0 ≤ x ≤ 1) have been generated using a modified Pechini powder synthesis process in conjunction with inkjet deposition as mentioned in this paper.
Abstract: Combinatorial libraries of the mixed oxide system Cu1−xCexO3 (0 ≤ x ≤ 1) have been generated using a modified Pechini powder synthesis process in conjunction with inkjet deposition. Mixed oxide crystalline powders were formed at temperatures below 500 °C. These powders have particle sizes in the range of 20.0 to 85.5 nm, and the powder surface area increases with cerium content. In addition, each of the mixed oxides (0 < x < 1) displayed catalytic activity in the CO oxidation reaction at temperatures between 150 and 350 °C. This novel protocol has also been used to generate a library of oxide powders of the perovskite-like La1−xSrxCoO3?δ system. The La–Sr–Co–O system from this protocol exhibits lower average surface areas than the Cu–Ce–O system (approximately 11.2 m2/g) due to higher decomposition temperatures but still acts as an active catalyst for the CO oxidation reaction.
40 citations
Patent•
04 Nov 1977TL;DR: In this article, the authors proposed a mixture of tungsten antimony, niobium, and molybdenum with a surface area of at least 10m 2 /g.
Abstract: Catalysts for the oxidation of hydrocarbons to maleic anhydride comprise a phosphorus/vanadium mixed oxide promoted by tungsten antimony, niobium, and/or molybdenum, having a surface area of at least 10m 2 /g.
40 citations