Abstract:
Preshaped forms, e.g., pellets, of high-surface-area alumina are impregnated with a solution of a boron compound which upon calcination yields B2O3, then dried and calcined at temperatures between about 675* and 1400*C. The resulting product has a moderately high surface area and pore volume, and undergoes substantially no shrinkage when utilized for catalytic purposes at temperatures up to about 1600*C. For catalytic purposes, the thus stabilized alumina forms may be utilized as such, or they may be impregnated with salts of catalytic metals and again calcined to yield supported catalysts of similar physical stability.
Abstract translation:高表面积氧化铝的脱盐形式例如粒料用硼化合物的溶液浸渍,硼化合物在煅烧时产生B 2 O 3,然后在约675℃至1400℃的温度下干燥和煅烧。所得产物具有适度的 高表面积和孔体积,并且当在高达约1600℃的温度下用于催化目的时,基本上不收缩。对于催化目的,可以如此使用由此稳定的氧化铝形式,或者它们可以用催化剂的盐浸渍 金属并再次煅烧以产生具有相似物理稳定性的负载型催化剂。
Abstract:
The radial and axial compressive strength of an approximately cylindrical talyst carrier, for automotive exhaust gases which is a honeycomb structure of thin aluminum oxide walls bounding axial conduits, is greatly enhanced by an outer shell of cured aluminum phosphate cement even if the latter is only one millimeter thick. The resistance of the carrier to thermal shock is improved if the wall of the shell spacedly envelops the outer axial face of the honeycomb core, and the annular gap is at least partly occupied by ceramic fibers which provide thermal insulation.
Abstract:
Certain crystalline aluminum borate catalyst supports containing about 8-25 weight-percent of B2O3 are found to provide unusually stable and active catalysts for high-temperature chemical conversions, particularly exhaust gas conversion, when prepared by precalcining shaped composites of alumina and boria at temperatures between about 1,250* and 2,600*F., prior to the addition thereto of active metal or metals. Calcination at below 1,250*F. is found to yield amorphous catalysts of inferior activity, while at temperatures above 2,600*F. drastic reductions in surface area may occur.
Abstract:
A method for producing a catalyst on the basis of phosphates of metals belonging to Group II for selective rupturing of BONDS IN ORGANIC COMPOUNDS, AND, IN PARTICULAR, FOR SPLITTING 4,4-DIMETHYL-1,3-DIOXANE INTO ISOPRENE, BY THERMAL PASSIVATION OF PHOSPHATES OF METALS BELONGING TO Group II, at temperatures within the range of 550* to 700*C in an atmosphere of superheated steam or of mixtures thereof with air or with an inert gas.
Abstract:
AN ACTIVATED TIN PHOSPHATE CATALYST IS PREPARED BY REACTING A TIN COMPOUND WITH A PHOSPHORIC ACID AND ACTIVATING THE TIN PHOSPHATE FORMED BY ADDING THERETO ONE OR MORE COMPOUNDS OF METALS FROM THE GROUP OF MOLYBDENUM, BISMUTH, VANADIUM, IRON AND COBALT AND THEREAFTER HEATING THE RESULTING MASS. THE TIN PHOSPHATE CATALYST CONTAINS IN THE RANGE OF 10 TO 30 PARTS BY WEIGHT OF PHOSPHORUS AND IN THE RANGE OF 30 TO 50 PARTS BY WEIGHT OF TIN PER 100 PARTS BY WEIGHT OF TIN PHOSPHATE. THE ACTIVATED TIN PHOSPHATE CATALYST CONTAINS FROM 1 TO 10% BY WEIGHT OF THE ACTIVATING METALS BASED ON THE WEIGHT OF THE TIN PHOSPHATE.
Abstract:
A method is provided for irreversibly occluding compositions consisting of salts such as metal halides, nitrates and the like, in crystalline metal aluminosilicates, such as the type X and Y zeolites. The salt doped zeolites are useful in the field of adsorption and catalysis, particularly in areas where these contact materials are employed in an acidic environment or corrosive environment.
Abstract:
ORGANIC COMPOUNDS ARE DEHYDROGENATED TO COMPOUNDS HAVING A HIGHER DEGREE OF UNSATURATION BY CONTACTING THE FEEDSTOCK IN THE VAPOR PHASE IN THE PRESENCE OF AN OXYGEN-CONTAINING GAS WITH A CATALYST CONTAINING AT LEAST ONE OF THE ELEMENS NICKEL, COBALT OR IRON IN ASSOCIATION WITH TIN, PHOSPHORUS, AND ARSENIC TOGETHER WITH SUFFICIENT COMBINED OXYGEN TO SATISFY THE VALENCE REQUIREMENT OF THE COMPONENTS OF THE CATALYST. OPTIONALLY, THE CATALYST COMPOSITIONS CAN CONTAIN MINOR AMOUNTS OF ALKALI METAL SUCH AS POTASSIUM. REPRESENTATIVE OF SUCH CONVERSIONS IS THE OXIDATIVE DEHYDROGENATION OF BUTANE TO BUTENES AND BUTADIENE. THE CONVERSION PRODUCTS ARE VALUABLE COMPOUNDS PARTICULARY USEFUL AS INTERMEDIATES FOR THE PREPARATION OF POLYMERIC MATERIALS SUCH AS SYNTHETIC RUBBERS AND THE LIKE.
Abstract:
FLUOROHALOCARBONS ARE DEHALOGENATED BY CONTACT IN THE PRESENCE OF HYDROGEN WITH A CATALYTIC COMPOSITION CONTAINING ALUMINUM FLUORIDE AND AT LEAST ONE METAL PHOSPHATE.
Abstract:
POWDERED ACIDIC CATALYST FOR FURAN RESINS IS FORMED IN SITU ON POWDERED INERT FILLER MATERIAL WHICH MAY OR MAY NOT CONTAIN A POWDERED COCATALYST DISPERSED THEREIN. THE ACIDIC CATALYST IS A SALT OF A STRONG ACID. IN SITU FORMATION OF THE ACIDIC SALT IS OBTAINED BY BLENDING THE ACID AND BASE INTO THE FILLER, AND UNIFORM, HOMOGENOUS DISPERSION OF THE SALT IS EFFECTED BY BLENDING ONE OF THEM, AS A LIQUID, INTO THE FILLER WHEREAFTER THE OTHER IS ADDED, AS A LIQUID, INTO THE BLEND TO PRODUCE A DRY POWDER WHICH IS THE ACIDIC CATALYST FORMED ON AND DISPERSED UNIFORMLY THROUGHOUT THE FILLER.
Abstract:
Unsaturated acids and aldehydes, as acrylic acid and acrolein, are prepared together in excellent yields by the oxidation of an olefin as propylene in the presence of a catalyst containing a IIA metal molybdate, as strontium molybdate, tellurium oxide and phosphorus pentoxide.