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There are 623 papers published in subject: since this site started. |
Results per page: | 623 Total, 63 Pages | << First < Previous 60 61 62 63 |
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1. Reforming of CH4 with CO2 and O2 to Produce Syngas Over Ni/MgO-SiO2 Using Fluidized Bed Reactor | |||
JING Qiangshan,LOU Hui,ZHENG Xiaoming | |||
Chemistry 08 March 2005 | |||
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Abstract:Reforming of methane with carbon dioxide and oxygen was investigated over Ni/MgO-SiO2 catalysts using fixed bed and fluidized bed reactors. The conversions of CH4 and CO2 in a fluidized bed reactor were close to thermodynamic equilibrium, the activity and stability of catalyst in the fixed bed reactor was lower than that in the fluidized bed reactor due to carbon deposition and nickel sintering. TGA and TEM techniques were used to characterize spent catalysts, results showed that a lot of whisker carbon was found on catalyst in the rear of the fixed bed reactor, and no deposited carbon was observed on catalysts in the fluidized bed reactor after reaction. It is suggested that this phenomenon is relate to a permanent circulation of catalyst particle between the oxygen-rich and oxygen-free zones. That is, fluidization of catalysts in fluidized bed reactor favors to inhibiting deposited carbon and a thermal uniformity in the reactor. | |||
TO cite this article:JING Qiangshan,LOU Hui,ZHENG Xiaoming. Reforming of CH4 with CO2 and O2 to Produce Syngas Over Ni/MgO-SiO2 Using Fluidized Bed Reactor[OL].[ 8 March 2005] http://en.paper.edu.cn/en_releasepaper/content/1660 |
2. Ultrasound-assisted On-line Hydrolysis Flow Injection Spectrophotometryfor Rapid Determination of Polysaccharides | |||
Zhi-Qi Zhang,Zhi-Chao Fan | |||
Chemistry 02 March 2005 | |||
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Abstract:Based on ultrasound-assisted on-line hydrolysis, a rapid and simple flow injection method is developed for the spectrophotrometric determination of polysaccharides with 3,5-dinitrosalicylic acid color reaction. In hydrolysis coil, placed in an ultrasonic and heating water bath, polysaccharides in dilute HCl solution were on-line hydrolyzed into reducing sugars. When the concentration of HCl solution was 2.5 mol L-1, the polysaccharide (glucan) of molecular weight 500,000 could be quickly and quantitatively hydrolyzed. Then the reducing sugars reacted with alkaline 3, 5-dinitrosalicylic acid solutions to form a red compound and the absorbance at 540 nm were measured. Expressed in glucose, the detection limits and linear ranges were 10 µg mL-1 and 20 -- 150 µg mL-1, respectively. The sampling rate was 45 h-1 and the average recoveries of known amount of the polysaccharide ranged between 96.0-102 %. | |||
TO cite this article:Zhi-Qi Zhang,Zhi-Chao Fan. Ultrasound-assisted On-line Hydrolysis Flow Injection Spectrophotometryfor Rapid Determination of Polysaccharides[OL].[ 2 March 2005] http://en.paper.edu.cn/en_releasepaper/content/1625 |
3. On the Reduction Mechanism for Glow Discharge Treatment of Pd/HZSM-5 | |||
Chao Chen,Dang-guo Cheng,Yong-bing Xie | |||
Chemistry 18 January 2005 | |||
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Abstract:Oxygen glow discharge has been used for treatment of Pd/HZSM-5 catalyst in order to investigate the catalyst reduction mechanism during gas discharge treatment. XRD and XPS characterizations demonstrate that the catalyst treatment using oxygen glow discharge leads to a reduction of Pd ions. This suggests that the electronic effect plays an important role in the treatment of catalyst using glow discharge. A highly durable catalyst for methane combustion has been obtained from the calcination of the glow discharge treated sample. The present investigation further confirms that the glow discharge treatment followed by calcination can lead to an excellent catalyst preparation with high dispersion, excellent low-temperature activity and enhanced stability for methane combustion catalytically. | |||
TO cite this article:Chao Chen,Dang-guo Cheng,Yong-bing Xie. On the Reduction Mechanism for Glow Discharge Treatment of Pd/HZSM-5[OL].[18 January 2005] http://en.paper.edu.cn/en_releasepaper/content/1467 |
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