2016.10.11-Tungsten Copper Rod Price
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- Category: Tungsten Copper Price
- Published on Tuesday, 11 October 2016 11:00
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As reported by Chinatungsten Online, the current price of 80%W20%Cu tungsten copper rod of Ø6mmx150mm is $5.20 per piece EXW Xiamen, China on Oct.11, 2016.
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2016.10.09-Tungsten Carbide Bar Price
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- Category: Tungsten Carbide Price
- Published on Sunday, 09 October 2016 10:31
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As reported by Chinatungsten Online, the current price of tungsten carbide bar for 300mmx20mmx4mm is $33.00 per piece EXW Xiamen, China on Oct.9, 2016.
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2016.10.09-75W Ø40mmx100mm Tungsten Copper Rod Price
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- Category: Tungsten Copper Price
- Published on Sunday, 09 October 2016 10:26
- Hits: 1335
As reported by Chinatungsten Online, the current price of 75%W25%Cu tungsten copper rod of Ø6.35mmx300mm is $90.00 per piece EXW Xiamen, China on Oct.9, 2016.
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Silicon Dioxide Supported Ammonium Metatungstate Catalyst
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- Category: Ammonium Metatungstate
- Published on Saturday, 08 October 2016 14:55
- Hits: 2053
It is found that the supported ammonium metatungstate (AMT) catalysts with the carriers of silicon dioxide, titanium dioxide and aluminium oxide have exhibited good catalytic activity for the synthesis of ortho - light anisole by gas - phase reaction of catechol and methanol. Among them, the AMT / silicon dioxide catalyst with tungsten loading of 7.9% has the best catalytic performance; in addition, the species with weak acidity and alkalinity which formed by the partial decomposition of ammonium metatungstate in the calcination process has been indicated to be the active center of the catalytic reaction.
Preparation of silicon dioxide supported ammonium metatungstate catalyst is using the traditional impregnation method, which is dipping carrier of silicon dioxide with ammonium metatungstate (AMT) aqueous solution in equal volume, followed by drying at 363 K for 6 hours, and then calcining at a certain temperature for 3 hours under air atmosphere to obtain SiO2/AMT catalyst. The study found that the calcination temperature affects the catalytic activity of silicon dioxide supported ammonium metatungstate catalyst; while the catalysts obtained at calcination temperatures of 533K and 573K showed the highest catechol conversion rate and selectivity of adjacent hydroxyl benzene methyl ether within 10 hours, which is respectively maintaining at about 97% and 90%.
Moreover, with the extension of reaction time, the activity of silicon dioxide supported ammonium metatungstate catalyst is decreased slowly, which is mainly attributed to the carbon deposition on the catalyst. The study of regeneration of deactivated SiO2 / AMT catalyst has proved that both the alcohol washed purging and low temperature (533k) calcination could not obviously restore the activity of the catalyst, and also the regenerated catalyst has stability no better than the fresh catalyst. This may be due to the change of the properties (including the acidity and alkalinity) of active centers on catalyst surface after high temperature regeneration treatment, and to make the easier deactivation of regenerated catalyst.
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2016.09.30-Tungsten Carbide Blank Rod Ø6mmx330mm Price
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- Category: Tungsten Carbide Price
- Published on Friday, 30 September 2016 11:42
- Hits: 1559
As reported by Chinatungsten Online, the current price of YG10x tungsten carbide blank rod for Ø6mmx330mm is $8.60 per piece EXW Xiamen, China on Sep.30, 2016.
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2016.09.30-Tungsten Copper Sheet 1.5mmx30mmx80mm Price
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- Category: Tungsten Copper Price
- Published on Friday, 30 September 2016 11:35
- Hits: 1384
As reported by Chinatungsten Online, the current price of 80%W20%Cu tungsten copper sheet of 1.5mmx30mmx80mm is $5.50 per piece EXW Xiamen, China on Sep.30, 2016.
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Ammonium Metatungstate Hydrotalcite Catalyst
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- Category: Ammonium Metatungstate
- Published on Friday, 30 September 2016 11:32
- Hits: 2167
In recent years, solid acid alkali catalysis of gas-solid-phase reaction of alkylation of catechols has attracted attention due to the environmentally friendly economy and overcoming the environmental pollution, separation and recovery difficulties and equipment corrosion and other defects, compared to conventional synthesis methods, and has shown significant advantages in saving resources and improving economic efficiency. It is found that Al-Ti-P-O, Al-Ti-Si-P-O and silica-supported ammonium metatungstate (AMT/SiO2) catalyst exhibited high catalytic activity.
Hydrotalcite is a kind of anionic clay with layered structure, because of its special layered structure and high catalytic performance in acid-base catalysis, condensation, addition polymerization, hydrogenation and alcohol conversion reaction, hydrotalcite has attracted many concerns. The exchangeable property of hydrotalcite anions make all kinds of anions (such as metatungstate ion) can be introduced into the interlayer of hydrotalcite in succession, thus to form a large class of materials - pillared hydrotalcite layered material.
A study has pointed out a preparation method of ammonium metatungstate hydrotalcite catalyst, and studied its catalytic performance, while the preparation steps are as follows:
1. synthesis of hydrotalcite material, take the raw material of magnesium nitrate hexahydrate, aluminum nitrate and sodium hydroxide, and to control the final pH value among 8 ~ 10 of the system, then go on aging, filtration and washing to get hydrotalcite NO3-MgAl;
2. Weigh a certain amount of fresh prepared hydrotalcite NO3-MgAl to disperse in distilled water, stirring at room temperature for overnight to fully expand;
3. Add dilute nitric acid dropwise to adjust the pH value of hydrotalcite slurry among 5.5~6, then rise the temperature to 348K;
4. Rapidly add ammonium metatungstate solution under the condition of stirring, and to react at 348K for 2 to 3 hours, then pumping wash the sample and dry at 348K to get the ammonium metatungstate hydrotalcite catalyst, i.e. AMT-Mg2Al.
The results showed that after changed with AMT, hydrotalcite will exhibit activity to the reaction of gas-solid phase reaction of catechol and methanol, while the conversion of catechol is 75%, the selectivity of guaiacol is 90%, but the catalytic activity decays.
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Ammonium Metatungstate Price on Sep.30th, 2016
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- Category: Ammonium Metatungstate
- Published on Friday, 30 September 2016 11:03
- Hits: 1590
Ammonium metatungstate price with purity over 91.40% from Chinatungsten Online is 35.50 USD/KG, by Chinatungsten FOB Xiamen, Sep.30th, 2016.
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Ø1.6x150.0mm Cerium Tungsten Electrode Price on Sep. 29, 2016
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- Category: Tungsten Electrodes Price
- Published on Thursday, 29 September 2016 16:40
- Hits: 2337
WC10 Cerium tungsten electrode price with Ø1.6x150.0mm is 0.407USD/pc, EXW XIAMEN, CHINA, Sep. 29, 2016.
The MOQ for this diameter under such price is 5,000pcs.
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Ø500xØ460x400mm Tungsten Crucible Price on Sep. 29, 2016
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- Category: Tungsten Metal Price
- Published on Thursday, 29 September 2016 16:38
- Hits: 2007
Ø500xØ460x400mm tungsten crucible price with purity over 99.95% is 19,500.00USD/PC, EXW XIAMEN, CHINA, Sep. 29, 2016.
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