Abstract: The present invention provides a catalyst composition and a process for reducing and removing nitrogen oxides with ammonia in the presence of molecular oxygen, said catalyst composition comprising at least three components of titanium, vanadium and magnesium and optionally tungsten, the titanium and tungsten being contained as oxides and the vanadium and magnesium being contained as oxides and/or sulfates. This catalyst composition is characterized by magnesium being substituted for all or part of expensive tungsten and has advantages of high activity with improved catalyst life and heat resistance.

Abstract: A process for producing an alkenyl-substituted aromatic compound which comprises catalytically reacting an alkyl-substituted aromatic compound in the vapor phase in the presence of molecular oxygen and a catalyst composed of palladium metal and a metal halide compound supported on an alumina carrier to convert it to the corresponding alkenyl-substituted aromatic compound, wherein said reaction is carried out in the presence of a catalyst composed of palladium metal and a metal halide compound supported on a carrier consisting substantially of .alpha.-alumina.

Abstract: A process for producing a halobiphenyl derivative represented by the following formula (I) comprises dehydrogenating a cyclohexylhalobenzene represented by the following formula (II) under such conditions that substantially no dehalogenation occurs. ##STR1## wherein X represents a halogen atom, and each of R.sup.1 and R.sup.2 independently represents a group represented by the formula ##STR2## wherein A represents carboxyl or an alkoxycarbonyl group and R represents a hydrogen atom or a lower alkyl group; an alkylcarbonyl; alkenyl; alkynyl; alkyl; aryl; arylcarbonyl; hydroxyalkyl; cyanoalkyl or cyanoalkenyl group.

Abstract: A process for producing olefin polymers comprising contacting an ethylenically unsaturated monomer comprising at least one olefin monomer with a catalyst system comprising a combination of a catalyst component I and a catalyst component II as described hereunder:Catalyst component IA solid product obtained by contacting the following constituents (a), (b) and (c) or (a), (b), (c) and (d) together:(a) A solid reaction product of a magnesium compound containing a hydroxyl group attached to magnesium and an organoaluminum compound represented by the formula R.sub.n AlX.sub.3-n wherein R represents a hydrocarbon residue having from 1 to 20 carbon atoms, X represents a halogen atom and n represents a number of greater than zero but not greater than 1.5, i.e. 0<n.ltoreq.1.

Abstract: A process for treating an exhaust gas containing nitrogen oxides, oxygen and ammonia gas with a catalyst consisting essentially of titanium oxide, copper oxide in an amount of 0.02 to 0.3 mole and molybdenum oxide or tungsten oxide in an amount of 0.01 to 0.5 mole per one mole of the titanium oxide. Because the catalyst exhibits good properties for decomposition of ammonia as well as for decomposition of nitrogen oxides it is possible to avoid secondary pollution due to unreacted ammonia.

Abstract: A catalyst compositions for reducing nitrogen oxide comprising, as its chief ingredient, an intimate mixture ofA. titanium (Ti) as component A, withB. at least one metal selected from the group consisting of molybdenum (Mo), tungsten (W), iron (Fe), vanadium (V), nickel (Ni), cobalt (Co), copper (Cu), chromium (Cr), and uranium (U), as component B,in the form of their oxides, and a process for reducing nitrogen oxides to nitrogen, which comprises contacting a gaseous mixture containing nitrogen oxides and molecular oxygen and a reducing gas with aforesaid catalyst compositions at an elevated temperature.

Abstract: A particulate composition composed of a core of active material and a protective sheath having communicating micro pores to permit access of reactants to the active materials is described as well as a method for preparing same.

Abstract: For production of acrolein by gas-phase catalytic oxidation of propylene with molecular oxygen, there is used a catalyst containing molybdenum, bismuth, cobalt, nickel, iron, tin, silicon, and a particular borate in a prescribed proportion. Sodium or manganese is employed for formation of the desired borate. For preparation of the catalyst, the borate of each of the metals is preferably supplied in the combined form of a sodium or manganese salt of various boric acids, such as borax, although it may be supplied separately as a boric acid and a decomposable compound of each metal.

Abstract: An ammonia gas to be determined, and an oxidative gas containing nitrogen oxides in moles more than those of the ammonia are brought into contact with an analytical catalyst capable of forming nitrogen and water from ammonia and nitrogen oxides.Concentrations of nitrogen oxides of the gas before and after the contact with the analytical catalyst are determined, and an ammonia concentration of the gas is determined by converting the difference between the concentrations of nitrogen oxides to the ammonia concentration by calculation.

Abstract: A catalyst composition for reducing nitrogen oxides, which is characterized in that the same contains, as its chief ingredient,A. tin (Sn) as the component A, andB. at least one metal selected from the group consisting of molybdenum (Mo), tungsten (W), and iron (Fe), as the component (B).in the form of their oxides, and a process for reducing nitrogen oxides to nitrogen, which comprises contacting a gaseous mixture containing nitrogen oxides and molecular oxygen and a reducing gas with aforesaid catalyst composition at elevated temperatures.

Abstract: In a process for methylation of phenols having at least one ortho-positioned hydrogen with methanol in the vapor phase, the methylation is catalytically carried out in the presence of a manganese oxide catalyst to produce ortho-methylphenols.

Abstract: A process for production of acrylic acid by vapor phase catalytic oxidation of acrolein comprising effecting the catalytic oxidation in the presence of a catalyst comprising1. oxides of molybdenum2. oxides of niobium3. oxides of silicon, and4. oxides of elements selected from the group consisting of copper, zinc, titanium, manganese, tungsten, iron, cobalt, nickel, cadmium, gallium, mercury, thorium and boron.