Read e-book online A text-book of practical organic chemistry, including PDF

By Arthur Israel Vogel

The most effective books there's educating useful natural chemistry. The 3rd variation of this booklet (first released in 1956) is absolutely of far better use to the pastime chemist, because it doesn't utilize any hideously dear glassware/apparatus or unique reagents or catalysts.

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Extra resources for A text-book of practical organic chemistry, including qualitative organic analysis

Example text

From this discussion, we can say that the sample AMPSb3 has more amount of Mo5+ species. The presence of reduced molybdenum species (Mo5+), which are known to be more active in redox-type reactions, is the reason for high conversions and yield of CP. 2 47 Influence of the Number of Transition Metal Atoms Incorporated to AMPA Incorporation of one V metal atom, which goes into the primary structure of Keggin ion of AMPA catalyst leads to enhancement of the redox properties of the catalysts. However, addition of further V may lead to the formation of amorphous material like [VO]2+ species in the secondary structure, which also helps enhance the redox behavior of the catalysts.

20 K. Narasimha Rao et al. disodium hydrogen phosphate was dissolved in water and mixed with required amount of sodium metavanadate that was already dissolved in boiling water. The mixture was cooled and acidified with concentrated sulfuric acid. An aqueous solution of sodium molybdate dihydrate was then added to this mixture. The addition of concentrated sulfuric acid with vigorous stirring resulted in a color change from dark red to light red. The VMPA formed was extracted with diethyl ether as the heteropoly acid was present in middle layer as heteropolyetherate, and the ether was removed by passing through air.

The hydrogen consumption was monitored using a thermal conductivity detector. TPD of ammonia was carried out on a laboratory built apparatus equipped with a Q-mass detector. In a typical experiment, about 500 mg of oven dried at 110 °C overnight sample was taken in a U-shaped quartz sample tube. 9 %, 50 ml/min). After pretreatment of the sample, it was saturated with anhydrous ammonia (in a flow of 10 % NH3-90 % He mixture) at 80 °C with a flow rate of 75 ml/min and was subsequently flushed at 105 °C for 2 h to remove any physisorbed ammonia.

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A text-book of practical organic chemistry, including qualitative organic analysis by Arthur Israel Vogel

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