摘要:
A catalyst is provided which is remarkably effective for catalyzing the oxidation of carbon monoxide to carbon dioxide at ambient conditions. This catalyst is prepared by contacting high surface area alumina with a solution of a cobalt compound (e.g., cobalt nitrate), adsorbing the cobalt compound on the alumina, removing the solvent, and thereafter heating the cobalt-treated alumina at a temperature of 400*C to 1,300*C in an oxygenproviding environment.
摘要:
A novel catalyst composition for vapor-phase oxidation of butenes which is active at a temperature in the range from 250* to 450*C and capable of converting n-butenes and iso-butene selectively into 1,3-butadiene and methacrolein, respectively. The said catalyst composition contains tungsten, molybdenum, tellurium, antimony and oxygen, one combination selected from among (a) nickel and cobalt, (b) nickel and iron, (c) nickel, cobalt and bismuth and (d) nickel, iron and bismuth, and at least one member selected from the group consisting of potassium, rubidium and cesium. Phosphorus and/or tin may also be added to the catalyst composition.
摘要:
Aromatic hydrocarbons are hydrogenated in the presence of hydrogen and a catalyst composite comprising at least two hydrogenating agents and an alumina support having a controlled bayerite concentration, average pore radius, and pore volume distribution and further having been calcined at a temperature in the range of 800.degree.- 1,600.degree. F. (427.degree. 871.degree. C.) prior to impregnation of the hydrogenating agent.
摘要:
A membrane catalyst for carrying out simultaneous processes involving evolution and consumption of hydrogen, which membrane catalyst is in the form of a cellular foil made of an alloy of palladium and at least one other element selected from the elements in group VIII of the Periodic System other than palladium, gold, copper, or boron, the foil having oppositely directed alternate projections of hemispherical or halfellipsoidal shapes, the ratio of the projection height to the foil thickness being within the range from 10 to 200:1. If more than one foil membrane is used in the process, the foils are positioned parallel to one another so that the projections of one foil oppose the projections of the neighboring one. A gap must be provided between the foils to allow the passage of the starting material and the discharge of the reaction products.
摘要:
Improved catalysts for oxidative dehydrogenation can be prepared by coprecipitating the metal containing catalysts from a solution of metal ions comprising iron and at least one other metal in the presence of a high molecular weight polyhydric material such as potato starch. The result of having the polyhydric material present is that the precipitate has the form of a gelatinous precipitate of improved processability. The catalyst itself is more active in dehydrogenations and physically stronger than comparable catalyst prepared by conventional methods.
摘要:
An improved process for hydrogenating organic compounds is provided in which a catalyst is employed that has a nickel surface area greater than about 70 m2/g and a sodium content less than 0.2 wt. % based on the total weight of catalyst. Significantly improved activity is obtained with the nickelsililca catalyst of this invention particularly in conversion of benzene to cyclohexane and in reducing oxo aldehydes to alcohols. The catalyst is prepared by coprecipitating nickel and silicate ions in the presence of a porous silica support under conditions of dilution that favor high surface areas and low inclusion of sodium in the catalyst.
摘要:
1. IN A PROCESS FOR PREPARING A CATALYST FOR THE DEHYDROGENATION OF ALKYL AROMATIC HYDROCARBONS TO VINYL AROMATIC HYDROCARBONS BY PREPARING A PASTE CONSISTING ESSENTIALLY OF FE2O3, CR2O3 OR AN ALKALI METAL CHROMATE OR DICHROMATE DECOMPOSIBLE TO CR2O3, AN ALKALI METAL OXIDE OR AN ALKALI METAL SALT DECOMPOSIBLE TO AN ALKALI METAL OXIDE, A BINDER AND SUFFICIENT WATER TO FORM SAID PASTE, FORMING SAID PASTE INTO PELLETS AND CALCINING SAID PELLETS INTO A FINISHED CATALYST, THE IMPROVEMENT WHICH COMPRISES EMPLOYING AS THE FE2O3 COMPONENT A MIXTURE OF HYDRATED FE2O3 AND ANHYDROUS FE2O3 WHEREIN THE HYDRATED FE2O3 IS PRESENT IN THE RANGE OF FROM ABOUT 79 PERCENT TO ABOUT 95 PERCENT OF THE TOTAL WEIGHT OF IRON OXIDES PRESENT.
摘要:
1. A METHOD OF REMOVING TRITIUM FROM AN INERT GAS COMPRISING THE STEP OF PASSNG SAID GAS INTO CONTACT WITH SOLID YTTRIUM PLATED WITH NICKEL AT A TEMPERATURE WITHIN THE RANGE OF 1000-1400:F., THE LATTER TO PREVENT INTERFERING CORROSION OF SAID YTTRIUM WHILE PERMITTING THE TRITIUM TO DIFFUSE THROUGH SAID REACT WITH SAID YTTRIUM.
摘要:
1. A PROCESS OF PREPARING A CATALYST SUITABLE FOR OXIDIZING METHANOL WITH AN OXYGEN CONTAINING GAS TO FORM FORMALDEHYDE, SAID CATALYST HAVING AN MOO3:FE2O3 WEIGHT RATIO OF BETWEEN 1:1 AND 10:1 COMPRISING COPRECIPITATING MOLYBDENUM AND IRON AS MOLYBDENUM OXIDE AND IRON OXIDE FROM AN AQUEOUS MIXTURE OF A MOLYBDENUM SALT CONTAINING MOLYBDENUM IN AN ORGANIC FORM AND AN IRON SALT WHICH IS WATER SOLUBLE FERROUS OR FERRIC SALT, MIXING TITANIUM DIOXIDE IN AN AMOUNT OF 1 TO 90 WEIGHT PERCENT OF THE TOTAL OXIDES WITH THE COPRECIPITATE AND TREATING THE MIXTURE AT 350 TO 600* C. IN AN OXIDIZING ATMOSPHERE.
摘要:
1. IN A PROCESS FOR MAKING A COBALT MOLYBDATE CATALYST, WHEREIN COBALT MOLYBDATE IS PRECIPITATED FROM THE COMBINED AQUEOUS SOLUTIONS OF A COBALT SALT, OF A MOLYBDENUM COMPOUND AND OF AMMONIA AT A TEMPERATURE OF ABOUT 60* C. AND AT A PH OF AT MOST 7, THE RESULTING PRECIPITATE IS FILTERED OFF, WASHED AND DRIED AT A TEMPERATURE OF AT LEAST 100* C., THE RESULTING DRY COBALT MOLYBDATE IS HEATED FOR SEVERAL HOURS AT ELEVATED TEMPERATURES, GROUND, SHAPED AND THE RESULTING SHAPES OF COBALT MOLYBDATE ARE SINTERED FOR SEVERAL HOURS, THE IMPROVEMENT WHICH COMPRISES COMBINING AN AQUEOUS SOLUTION OF THE COBALT SALT WITH THAT OF THE MOLYBDENUM COMPOUND IN THE ATOMIC ARTIO OF CO:MO OF ABOUT 1.05:1; ESTABLISHING IN THE COMBINED SOLUTIONS A PH BETWEEN 3.8 AND 6.0; DRYING THE PRECIPITATE AT 110-170* C; HEATING THE DRY COBALT MOLYBDATE TO TEMPERATURES BETWEEN 250 AND 550* C.; AND SINTERING THE COBALT MOLYBDATE SHAPES AT TEMPERATURES BETWEEN 500 AND 700* C WITH THE RESULTANT FORMATION OF A COBALT MOLYBDATE CATALYST HAVING AN INNER SURFACE ARE BETWEEN 4 AND 8 SQUARE METERS/G. AND A VOLUME OF PORES BETWEEN 0.1 AND 0.2 MILLILITERS/G.