Tuesday, March 9, 2010

Finding the Green in the Gold color.

A new nanoporous gold material prepared by removing the silver from the gold-silver alloy that selectively catalyze the production of an important industrial compounds under mild conditions, according to a research team in Germany and the United States (Science 2010, 327, 319).

Further studies to expand the list of katalik reaction grows faster than gold. This also can help businesses - an effort to replace the chemical industry processes with some dangerous substances and "more green".

Only a few years, gold's reputation as an inert metal nonkatalis have a complete change, as several groups of researchers have discovered a number of reactions that include various types of oxidation on catalyst by gold nano structures. However, commercial applications have been hampered by the slowness gold itself to dissociate the oxygen in which a key step oxidation and the tendency of particles - to classify nano particles under typical reaction conditions. The process shortens the age rapidly catalyst supports such as gold, which normally circulate in the solid oxide surface.

New catalyst provides a way in some of these problems. By treating the gold-silver alloy denagn nitric acid, the researchers established a gold catalyst that does not support monolotik and stable network that consists of three-dimensional nano structures ligaments. This team, including Arne Wittstock, Volkmar Zielasek, and Marcus Bäumer from the University of Bremen, in Germany; Cynthia M. Friend of Harvard University and his colleagues have found that at low temperature and oxygen 1, nanoporous materials catalyze the oxidative duplication of methanol to produce methyl formate. Compounds are used commercially as a solution and blower agent and as a pioneer for formic acid and dimethylformamide. This was prepared in an industrial process that uses carbon monoxide, methanol, caustic alkali, and metallic sodium.

At room temperature, the reaction of gold with a 100% selective catalyst but working in inert, the report of this team. Increasing the temperature by only 80 ° C to accelerate the reaction, methanol conversion increased several-fold, and only slightly reduced selectively manufacture approximately 3% of CO2, according to the researchers. They explained that the catalyst remains stable and active during the test worked continuously for a period of several days to weeks. In addition, the basic experiment with a series different example - an example was de-alloy, the team concluded that a small fraction of the residual silver increases with rekatifitas gold catalyst showed oxygen dissociation.

A new nanoporous gold material prepared by removing the silver from the gold-silver alloy that selectively catalyze the production of an important industrial compounds under mild conditions, according to a research team in Germany and the United States (Science 2010, 327, 319).

Further studies to expand the list of katalik reaction grows faster than gold. This also can help businesses - an effort to replace the chemical industry processes with some dangerous substances and "more green".

Only a few years, gold's reputation as an inert metal nonkatalis have a complete change, as several groups of researchers have discovered a number of reactions that include various types of oxidation on catalyst by gold nano structures. However, commercial applications have been hampered by the slowness gold itself to dissociate the oxygen in which a key step oxidation and the tendency of particles - to classify nano particles under typical reaction conditions. The process shortens the age rapidly catalyst supports such as gold, which normally circulate in the solid oxide surface.

New catalyst provides a way in some of these problems. By treating the gold-silver alloy denagn nitric acid, the researchers established a gold catalyst that does not support monolotik and stable network that consists of three-dimensional nano structures ligaments. This team, including Arne Wittstock, Volkmar Zielasek, and Marcus Bäumer from the University of Bremen, in Germany; Cynthia M. Friend of Harvard University and his colleagues have found that at low temperature and oxygen 1, nanoporous materials catalyze the oxidative duplication of methanol to produce methyl formate. Compounds are used commercially as a solution and blower agent and as a pioneer for formic acid and dimethylformamide. This was prepared in an industrial process that uses carbon monoxide, methanol, caustic alkali, and metallic sodium.

At room temperature, the reaction of gold with a 100% selective catalyst but working in inert, the report of this team. Increasing the temperature by only 80 ° C to accelerate the reaction, methanol conversion increased several-fold, and only slightly reduced selectively manufacture approximately 3% of CO2, according to the researchers. They explained that the catalyst remains stable and active during the test worked continuously for a period of several days to weeks. In addition, the basic experiment with a series different example - an example was de-alloy, the team concluded that a small fraction of the residual silver increases with rekatifitas gold catalyst showed oxygen dissociation.

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