The efect of CO2 on catalytic activity for CO oxidation on Cu-Ce-O fluorite-type complex oxides has been investigated. CO2 played an inhibiting role in CO oxidation on the cat-alyst simlar to what happened on CeO2. As...The efect of CO2 on catalytic activity for CO oxidation on Cu-Ce-O fluorite-type complex oxides has been investigated. CO2 played an inhibiting role in CO oxidation on the cat-alyst simlar to what happened on CeO2. As CO2 was introduced into the feed, the coliversion of CO to CO2 on the catalyst was reduced a little. At room temperature,the catalyst could easily adsorb CO2 in large amounts from the air to fbrm carbonate on its surtace.as well as from the yields at low reaction temperature As a restit,the catalyst could be poisoned by CO2 tentatively.The catalytic activity could be recovered to its imitial value on being heated at 300 ℃ or highertemperature.Cu-Ce-O catalyst showed high activity with CO conversion over 98% after being pretreated to desorb CO2 previously.展开更多
During the course of synthetic work on some thiazepins, we attempted to prepare 4-tolyl propenyl ketonc (I) from toluene and crotonic acid by the action of polyphosphoric acid according to the method of Sukh Dev. The ...During the course of synthetic work on some thiazepins, we attempted to prepare 4-tolyl propenyl ketonc (I) from toluene and crotonic acid by the action of polyphosphoric acid according to the method of Sukh Dev. The product obtained was a colourless liquid (II) with a distinct carbonyl reaction, but it was different from the substance展开更多
文摘The efect of CO2 on catalytic activity for CO oxidation on Cu-Ce-O fluorite-type complex oxides has been investigated. CO2 played an inhibiting role in CO oxidation on the cat-alyst simlar to what happened on CeO2. As CO2 was introduced into the feed, the coliversion of CO to CO2 on the catalyst was reduced a little. At room temperature,the catalyst could easily adsorb CO2 in large amounts from the air to fbrm carbonate on its surtace.as well as from the yields at low reaction temperature As a restit,the catalyst could be poisoned by CO2 tentatively.The catalytic activity could be recovered to its imitial value on being heated at 300 ℃ or highertemperature.Cu-Ce-O catalyst showed high activity with CO conversion over 98% after being pretreated to desorb CO2 previously.
文摘During the course of synthetic work on some thiazepins, we attempted to prepare 4-tolyl propenyl ketonc (I) from toluene and crotonic acid by the action of polyphosphoric acid according to the method of Sukh Dev. The product obtained was a colourless liquid (II) with a distinct carbonyl reaction, but it was different from the substance
