摘要:
A process is disclosed for the catalytic hydroxylation of aromatic hydrocarbons which comprises contacting aromatic feedstock with oxidant comprising molecular oxygen, under suitable reaction conditions, in the presence of a catalyst comprising three essential components: a support; transition metal selected from the group consisting of vanadium, niobium, copper, palladium, nickel and silver, or combinations thereof, and a promoter comprising a multidentate chelating, binucleating ligand. The catalysts may further comprise additional metal ions. The process is particularly suited, for example, to the one-step conversion of benzene to phenol.
摘要:
A modified supported noble metal catalyst is disclosed for the selective hydrogenation of aromatic halonitro compounds to form aromatic haloamines. The support consists of active carbon. The active component is platinum modified with copper. The new catalyst is distinguished by good selectivity and a high yield.
摘要:
The present invention relates to a method for producing a hydrogen-containing chloromethane such as chloroform at high selectivity in good yield by reducing a polychloromethane such as carbon tetrachloride in the presence of a reduction catalyst.In the present invention, it is important to conduct the reduction reaction in a liquid phase, whereby formation of impurities such as polymers which deactivate the catalyst, can effectively be suppressed, and the high selectivity and high activity of the reduction catalyst can adequately be obtained.As the reduction catalyst, at least one member selected from elements of Groups 8, 9 and 10, such as ruthenium, rhodium, palladium and platinum, may suitably be employed. Also a catalyst comprising, as the main component, such an element and having at least one member of Group 11 elements such as copper, silver and gold added thereto, may also suitably be employed.In a case where the liquid phase reduction reaction is conducted continuously, it is preferred to adopt a fixed bed system, particularly a trickle bed system.The method of the present invention is valuable also as a method for converting carbon tetrachloride which is regulated from the standpoint of global environmental protection, to chloroform which is useful as raw material for various fluorine-containing compounds.
摘要:
The invention relates to a process for the conversion of synthesis gases into a mixture of essentially linear and saturated hydrocarbons, characterized by the use of a catalyst prepared by a gelling procedure, incorporating cobalt, copper and ruthenium, the cobalt, copper and ruthenium being dispersed on a support having at least one oxide of a metal chosen from within the group formed by silica and alumina, the cobalt content, expressed by cobalt weight based on the catalyst weight, being between 1 and 60% by weight, the ruthenium content, expressed by ruthenium weight based on the cobalt weight, being between 0.1 and 20%, and the copper weight, expressed by copper weight based on the cobalt weight, being between 0.1 and 10%.
摘要:
A carbonic acid diester is stably and safely produced at a high selectivity and at a high yield by catalytically reacting carbon monoxide with a nitrous acid ester in a gas phase in the presence of a solid catalyst comprising a catalytic solid material carried on a solid carrier and comprising:(a) a platinum group metal and/or a compound thereof,(b) a compound of Fe, Cu, Bi, Co, Ni and/or Sn, and(c) a vanadium compound, molybdenum compound, tungsten compound, sulfuric acid and/or phosphoric acid.
摘要:
A metallic oxide catalyst, containing cupric oxide and an amount of one or more of AgO, HgO or CdO effective for enhancing the ability of the catalyst for removing gaseous hydrides from a gas stream.
摘要:
A supported platinum alloy electrocatalyst for an acid electrolyte fuel cell, said electrocatalyst consisting essentially of an electrically conductive powdery carbon carrier and dispersed in, and deposited on, the carrier, an ordered platinum-iron-copper ternary alloy comprising 40 to 60 atomic percent of platinum, 13 to 40 atomic percent of iron and 13 to 40 atomic percent of copper. The electrocatalyst has much better initial activity and lifetime than conventional platinum alone or multi-components alloy electrocatalysts. A process for producing the supported platinum alloy electrocatalyst which comprises depositing copper on a previously formed platinum-iron supported binary ordered alloy, again subjecting the product to an alloying treatment, or depositing iron on the platinum-copper supported binary alloy and then again subjecting the product to an alloying treatment. An electrode for an acid electrolyte fuel cell having an excellent output performance and a long operating life is also provided which comprises the above supported platinum alloy electrocatalyst and a water-repellent binder which are bonded to an electrically conductive and acid-resistant supporting member.
摘要:
The invention relates to a novel supported catalyst comprising (a) copper, (b) a metal having an atomic weight greater than 100 and selected from Groups VIIB and VIII of the Periodic Table and (c) an alkali metal in a weight ratio of about 8-40:0.05-5:1.5-10 and to the use of the catalyst in the hydrogenation of butyrolactone to 1,4-butanediol.
摘要:
Provided is an improved catalyst and a process employing same in the treatment of exhaust gases generated by internal combustion engines. The catalyst comprises a support and an active phase comprising copper, cerium and/or iron, at least one metal selected from the group consisting of platinum and palladium, and at least one metal selected from the group consisting of iridium and rhodium. The catalyst is particularly active in the removal of carbon monoxide, unburned hydrocarbons and nitrogen oxides generally present in the exhaust gases of an internal combustion engine.
摘要:
A process for simultaneously producing an epoxide and a carboxylic acid from an olefin and an aldehyde, respectively, by co-oxidation over a catalyst in the presence of oxygen is described. The catalyst is made by precipitating silver oxide in the presence of copper(II) oxide, copper(II) borate or a mixture thereof. These novel heterogeneous catalysts provide higher selectivities to the epoxide than those obtainable with commercial catalysts.