摘要:
Materials of oxygen ion conductors comprising CeO.sub.2 -CaO type oxides wherein 5-60 mol % of CaO is mixed with CeO.sub.2 having a fluorite structure, and composite oxides wherein CeO.sub.2 of said CeO.sub.2 -CaO type oxides is replaced by oxide of magnesium or aluminum by 5-10 mol %.
摘要:
A heat-resistant noble metal catalyst having both of exceedingly superior heat-resistant property and a remarkable high activity at any temperature ranges of low, middle, and high, is provided having a heat-reistant noble metal catalyst consisting essentially of a composition having a formula A.sub.1-z C.sub.z B.sub.x D.sub.u Al.sub.12-y-u O.sub.19-.alpha., wherein A is at least one element selected from the group consisting of Ba, Ca and Sr, C is at least one element selected from the group consisting of K, Rb and rare earth elements, B is at least one element selected from the group consisting of Mn, Co, Fe, Ni, Cu and Cr, D is at least one element selected from the group consisting of Au, Ag and platinum group noble metals, z is a value in a range of 0-about 0.4, x is a value in a range of 0-about 4, y is a value in a range of x-2x, u is a value of not less than about 0.01, x+u is a value of not more than about 4, and .alpha. is a value which is determined by the values X, Y, Z and U of the respective elements, A, C, B and D and the values of x, y, z and u and is expressed as.alpha.=1-1/2{X-z(X-Y)+xZ+uU-3y-3u}.A method of producing such a catalyst is also provided.
摘要:
A deflection apparatus arranged on the outer circumference of a funnel of a cathode ray tube includes a deflection yoke having vertical deflection coils and horizontal deflection coils. A compensation coil is provided on the outer circumference of a front end opening portion of the deflection yoke. An electrostatic capacitance element is connected between both end terminals of the compensation coil. The capacity of the electrostatic capacitance element is set such that an inducing voltage generated between both end terminals of the compensation coil is equal to or lower than a predetermined value.
摘要:
An excellent steam reforming catalyst for hydrocarbons is provided having at least one of nickel oxide, cobalt oxide and platinum group noble metals supported on a carrier consisting essentially of aluminum oxide Al.sub.2 O.sub.3 and a metal oxide expressed by MeO, comprising about 3-35 mols of metal oxide MeO to 100 mols of aluminum oxide Al.sub.2 O.sub.3 in the carrier, Me being at least one metal selected from the group consisting of calcium Ca, barium Ba and strontium Sr. The catalyst exhibits high activity, superior mechanical strength, good heat resistant property, splendid chemical stability, and remarkable thermal shock resistant property, retains a high specific surface area at high temperatures, and does not form detrimental nickel aluminate or cobalt aluminate in steam reforming reactions of hydrocarbons.A method of producing the catalyst is also provided.
摘要:
Excellent heat resistant compositions suitable for catalyst carries or catalysts are provided, which retain specific surface area thereof at high temperatures of not less than about 1200.degree. C. far better than conventional most superior .gamma.-alumina.
摘要:
The invention provides a carbon monoxide conversion method for hydrogen-containing gas. The method comprises selective CO conversion in hydrogen-containing gas through contact of CO with steam and oxygen in the presence of a catalyst containing copper, alumina and zinc oxide.
摘要:
Excellent heat resistant high activity catalyst which retains catalyst activity at high temperatures of not less than about 1,200.degree. C. is provided.
摘要:
Crude sodium hexafluorosilicate containing gypsum and various metal phosphates is refined into highly pure and sufficiently large crystals. First, the crude fluorosilicate is treated with a sodium chloride solution to dissolve gypsum. Then the solid phase is reconstituted into an aqueous slurry in which the concentration of Na is limited. This slurry is acidified and maintained at temperatures not lower than 80.degree. C. with continued stirring to cause recrystallization of sodium hexafluorosilicate.