The Comparison of Different Preparation Methods of Catalysts for Furfural Hydrogenization to 2 - Methyl Furan

2013 ◽  
Vol 791-793 ◽  
pp. 68-71
Author(s):  
Zeng Xin Li ◽  
Tong Zhu Han ◽  
Wen Xia Guo ◽  
Guo Ming Wang
Keyword(s):  
Metal Atom ◽  
Metal Particle ◽  
Catalytic Properties ◽  
Hydrogenation Reaction ◽  
Impregnation Method ◽  
Preparation Methods ◽  
Metal Particle Size ◽  
Furfural Hydrogenation ◽  
Distribution Uniformity ◽  
Xrd Patterns

Three different kinds of preparation methods were contrasted and studied to furfural hydrogenation catalyst for 2 - methyl furan production.Cu, Cr-based catalysts are prepared by three different methods, and the differences were also studied in the structure of these catalysts and their catalytic properties on furfural hydrogenation reaction. From the XRD patterns of samples prepared by different methods of Cu-Cr/γ-Al2O3, The results show that: the metal particle size is:the ordinary impregnation method > coprecipitation > solvated metal atom impregnation method. From the SEM photographs by samples, distribution uniformity of the catalyst ion surface: ordinary impregnation method > coprecipitation > solvated metal atom impregnation method. The reduction degree of the metal: solvated metal atom impregnation ordinary impregnation coprecipitation method. Furfural hydrogenation experimental results show that the order of catalytic activity is solvated metal atom > general impregnation coprecipitation; the selectivity order of 2 - methyl furan: coprecipitation> ordinary impregnation method solvated metal atom impregnation method.

Enhanced Photocatalytic Performance of Copper-Modified Titanium Dioxide Prepared by UV Reduction Method

2015 ◽  
Vol 1112 ◽  
pp. 180-183 ◽  
Author(s):  
Nur Azmina Roslan ◽  
Hendrik O. Lintang ◽  
Leny Yuliati
Keyword(s):  
Crystallite Size ◽  
Reduction Method ◽  
Anatase Phase ◽  
Emission Spectra ◽  
Dichlorophenoxyacetic Acid ◽  
Impregnation Method ◽  
X Ray Diffraction ◽  
Preparation Methods ◽  
Xrd Patterns ◽  
2,4 Dichlorophenoxyacetic Acid

In the present study, commercial Hombikat N100 TiO2 that consists of 100% of anatase phase was modified with copper (Cu) as a co-catalyst via two different preparation methods, which were photocatalytic UV reduction and impregnation methods. The Cu loading was fixed to be 0.1 wt%. The X-ray diffraction (XRD) patterns showed that Cu/TiO2 sample prepared via different preparation methods gave different crystallinity and/or crystallite size. The Cu/TiO2 sample prepared by photocatalytic UV reduction method has lower crystallinity and/or crystallite size than the sample prepared by impregnation method. The performance of the TiO2 and Cu/TiO2 samples was evaluated for degradation of 2,4-dichlorophenoxyacetic acid (2,4-D). After 1 hour reaction, the TiO2 showed percentage removal of 31%, while the Cu/TiO2 sample prepared by photocatalytic UV reduction and impregnation methods gave 39 and 28%, respectively. It was proposed that the higher activity on the Cu/TiO2 sample prepared by photocatalytic UV reduction method was caused by the more successful suppression of electron-hole recombination, as supported by the emission spectra.

Synthesis and Characterization of γ-Alumina-Supported Cobalt and Iron Nanocatalysts

2012 ◽  
Vol 545 ◽  
pp. 129-136 ◽  
Author(s):  
Sardar Ali ◽  
Noor Asmawati Mohd Zabidi ◽  
Duvvuri Subbarao
Keyword(s):  
Particle Size ◽  
Metal Particle ◽  
Nitrogen Adsorption ◽  
Impregnation Method ◽  
Medium Temperature ◽  
Metal Particle Size ◽  
Transmission Electron ◽  
Adsorption Analysis ◽  
Temperature Programmed ◽  
Bimetallic Nanocatalysts

The present work deals with the synthesis of cobalt monometallic and bimetallic Co/Fe nanocatalysts supported on alumina. The nanocatalysts were prepared by a wet impregnation method. The samples were characterized in terms of reducibility, dispersion, metal particle size, textural characteristics and crystallinity. These characteristics were revealed using hydrogen temperature-programmed reduction (TPR), CO-chemisorption, transmission electron microscopy (TEM), X-ray diffraction (XRD) and nitrogen adsorption analysis. H2-TPR analysis of Co/Al2O3indicated three temperature regions at 507◦C (low temperature), 650◦C (medium temperature) and 731◦C (high temperature) while characteristic peaks of Fe/ Al2O3appeared at 454◦C, 635◦C and 716◦C, respectively. Bimetallic nanocatalysts exhibited different physicochemical properties than those of the monometallic nanocatalysts. The incorporation of iron into cobalt nanocatalysts up to 50% of the total metal loaded enhanced the reducibility, increased the CO and H2chemisorbed and degree of reduction (DRT) while surface area decreased, further increase in the iron content resulted in a decrease in the crystallinity, increase in the average metal particle size and shift in the reduction towards higher temperatures.

scholarly journals Synthesis and Characterization of Metal Modified Catalysts for Decomposition of Ibuprofen from Aqueous Solutions

Catalysts ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 786 ◽  
Author(s):  
Soudabeh Saeid ◽  
Matilda Kråkström ◽  
Pasi Tolvanen ◽  
Narendra Kumar ◽  
Kari Eränen ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Particle Size ◽  
Catalytic Activity ◽  
Liquid Chromatography ◽  
Metal Particle ◽  
Catalytic Ozonation ◽  
Preparation Methods ◽  
Metal Particle Size ◽  
Ozonation Process ◽  
By Products

The presence of pharmaceuticals in surface water, drinking water, and wastewater has attracted significant concern because of the non-biodegradability, resistance, and toxicity of pharmaceutical compounds. The catalytic ozonation of an anti-inflammatory pharmaceutical, ibuprofen was investigated in this work. The reaction mixture was analyzed and measured by high-performance liquid chromatography (HPLC). Liquid chromatography-mass spectrometry (LC-MS) was used for the quantification of by-products during the catalytic ozonation process. Ibuprofen was degraded by ozonation under optimized conditions within 1 h. However, some intermediate oxidation products were detected during the ibuprofen ozonation process that were more resistant than the parent compound. To optimize the process, nine heterogeneous catalysts were synthesized using different preparation methods and used with ozone to degrade the ibuprofen dissolved in aqueous solution. The aim of using several catalysts was to reveal the effect of various catalyst preparation methods on the degradation of ibuprofen as well as the formation and elimination of by-products. Furthermore, the goal was to reveal the influence of various support structures and different metals such as Pd-, Fe-, Ni-, metal particle size, and metal dispersion in ozone degradation. Most of the catalysts improved the elimination kinetics of the by-products. Among these catalysts, Cu-H-Beta-150-DP synthesized by the deposition–precipitation process showed the highest decomposition rate. The regenerated Cu-H-Beta-150-DP catalyst preserved the catalytic activity to that of the fresh catalyst. The catalyst characterization methods applied in this work included nitrogen adsorption–desorption, scanning electron microscopy, transmission electron microscopy, and Fourier-transform infrared spectroscopy. The large pore volume and small metal particle size contributed to the improved catalytic activity.

scholarly journals The Importance of Thermal Treatment on Wet-Kneaded Silica–Magnesia Catalyst and Lebedev Ethanol-to-Butadiene Process

Nanomaterials ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 579
Author(s):  
Sang-Ho Chung ◽  
Adrian Ramirez ◽  
Tuiana Shoinkhorova ◽  
Ildar Mukhambetov ◽  
Edy Abou-Hamad ◽  
...  
Keyword(s):  
Thermal Treatment ◽  
Calcination Temperature ◽  
Catalytic Properties ◽  
Catalyst Preparation ◽  
Preparation Methods ◽  
Calcination Temperatures ◽  
Alternative Process ◽  
Magnesium Silicates

The Lebedev process, in which ethanol is catalytically converted into 1,3-butadiene, is an alternative process for the production of this commodity chemical. Silica–magnesia (SiO2–MgO) is a benchmark catalyst for the Lebedev process. Among the different preparation methods, the SiO2–MgO catalysts prepared by wet-kneading typically perform best owing to the surface magnesium silicates formed during wet-kneading. Although the thermal treatment is of pivotal importance as a last step in the catalyst preparation, the effect of the calcination temperature of the wet-kneaded SiO2–MgO on the Lebedev process has not been clarified yet. Here, we prepared and characterized in detail a series of wet-kneaded SiO2–MgO catalysts using varying calcination temperatures. We find that the thermal treatment largely influences the type of magnesium silicates, which have different catalytic properties. Our results suggest that the structurally ill-defined amorphous magnesium silicates and lizardite are responsible for the production of ethylene. Further, we argue that forsterite, which has been conventionally considered detrimental for the formation of ethylene, favors the formation of butadiene, especially when combined with stevensite.

Control of Ni metal particle size in Ni/SiO2 catalysts by calcination and reduction temperatures

1987 ◽  
Vol 83 (10) ◽  
pp. 3189 ◽  
Author(s):  
Hiroyuki Tamagawa ◽  
Kyuichi Oyama ◽  
Tsuyoshi Yamaguchi ◽  
Hiroshige Tanaka ◽  
Hideyasu Tsuiki ◽  
...  
Keyword(s):  
Particle Size ◽  
Metal Particle ◽  
Metal Particle Size
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