Showing papers on "Bimetallic strip published in 1976"

Chemisorption Complexes on Alloy Surfaces

Abstract: Three factors have greatly promoted the recent revival of interest in catalysis by alloys. The first was the finding that in industrial catalysis certain bimetallic systems are superior to monometallic catalysts. Sinfelt [1–5] had a particularly important share in the pioneering work supporting this finding. He showed that the selectivity for catalyzing nondestructive hydrocarbon reactions is often significantly tighter for a bimetallic catalyst than for its most active monometallic constituent. Even more important was the finding that bimetallic catalysts are frequently less susceptible to poisoning by, e.g., carbonaceous residues [1–6], As a consequence, their steady-state activity will be superior to that of monometallic catalysts even if the initial activity was lower.

Production of metal strip from powder

Abstract: Metal strip is continuously produced by compacting metal powder to form a green strip, feeding the green strip to a sinter furnace and supporting the strip on a gaseous cushion as it is transported through the furnace, the strip transport being controlled to maintain the tensile stress applied to the strip as it passes through the furnace substantially zero. The strip may be fed through the furnace by means of pinch rolls located at entry to and exit from the furnace, the respective speeds of rotation of the pinch rolls being interrelated to accommodate shrinkage of the strip as it passes through the furnace.

Benzene hydrogenation on platinum-tin bimetallic catalysts

Abstract: Various catalysts were prepared by impregnating a commercial alumina with solutions containing the complex dichlorobis(trichlorostannato)platinate (II). [Pt Cl2 (SnCl3)2]2−. After reduction, 1–20 fold variations in the catalytic activity in benzene hydrogenation were observed in direct proportion to the stability of the complex in the impregnating solution.

Mössbauer Spectroscopy of Supported Bimetallic Catalysts

Abstract: In recent years there has been renewed interest in catalysis by alloys from both the fundamental and practical points of view. Much of this interest has been stimulated by the advent of bimetallic catalysts in catalytic reforming. Recent studies of Sinfelt and co-workers (1) have demonstrated that alloying can have a marked effect on catalytic specificity. For example, the specific activity of bulk CuNi alloys for carbon-hydrogen bond breaking (dehydrogenation) is nearly independent of composition up to ~80 atomic percent Cu whereas the specific activity for carbon-carbon bond breaking (hydrogenolysis) is decreased by about four orders of magnitude when ~30 atomic percent Cu is added to Ni. Similar results obtained by Sinfelt (2) for SiO2-supported CuRu and CuOs catalysts strongly point to the formation of bimetallic clusters in these well-dispersed metal catalysts. The term bimetallic cluster is preferred to alloy for well-dispersed particles where surface effects dominate since catalytic evidence indicates that bimetallic clusters may be formed even for cases where no corresponding bulk alloy is known (2).

Diprotonated Bimetallic Complex between Copper(II) with 3,3′-Bis[N,N-bis(carboxymethyl)aminomethyl]-o-cresolsulfonphthalein

Abstract: The solution chemistry for complexes of copper(II) with 3,3′-bis[N,N-bis(carboxymethyl)aminomethyl]-o-cresolsulfonphthalein(XO) is studied by spectrophotometric measurement. Copper(II) is found to form a diprotonated bimetallic complex with XO in weakly acidic medium. Stability constant and molar absorptivity of the complex are evaluated to be logKCu2LH2=9.86±0.05 and e574nm=3.73×104 M−1 cm−1, respectively, at 25.0 °C and I=0.1 M. Thermodynamic parameters are calculated to be ΔH=4.3 kcal·mol−1 and ΔS=64 eu at 25.0 °C and I=0.1 M.

Continuous heat treatment of cold rolled steel strip

Abstract: Cold-rolled steel strip is heated to a temperature higher than its recrystallization temperature, preferably faster than 4° C/s. The strip is then held for more than 30 seconds. The strip is then cooled by immersion in an aqueous bath maintained at substantially its boiling temperature within a temperature range of 80°-150° C.

Detection of the temperature of sheet or strip material

Abstract: For detecting the temperature profile of a moving strip, strip is caused to pass in contact with a series of hollow rotors which are spaced across the strip width, and each of which is supported by a gas bearing. A thermal detector is located within each rotor to respond to the temperature of that part of the strip in contact with the rotor. The rotors may also be used to detect the variation in tension across the strip width. In that case, the thermal detectors can modify the tension measurements to compensate for thermal errors.

Conversion of hydrocarbons with a superactive acidic bimetallic catalytic composite

Abstract: A superactive acidic bimetallic catalytic composite, comprising a combination of catalytically effective amounts of a platinum group component, a tin component and a computed amount of a halogen component with a porous carrier material, is disclosed. The platinum group and tin component are present in the composite in amounts, calculated on an elemental basis, of about 0.01 to about 2 wt. % platinum group metal and about 0.01 to about 5 wt. % tin. The amount of the halogen component is selected as a function of the surface area of the porous carrier material and of the moles of tin contained in the composite in accordance with a hereinafter disclosed relationship. Moreover, the tin component is uniformly dispersed throughout the porous carrier material in a particle size having a maximum dimension less than 100° A, substantially all of the platinum group component is present as the elemental metal and substantially all of the tin component is present in an oxidation state above that of the elemental metal. The principal utility of this superactive acidic bimetallic composite is in the conversion of hydrocarbons, particularly in the reforming of a gasoline fraction to produce a high octane and aromatic rich reformate. A specific example of the superactive acidic bimetallic catalyst disclosed is a combination of a platinum group metal, tin and chlorine with an alumina carrier material, wherein the tin component is uniformly dispersed throughout the alumina carrier material in a positive oxidation state and in a relatively small particle size and wherein the composite contains, on an elemental basis, about 0.01 to 2 wt. % platinum metal, about 0.01 to 5 wt. % tin and chlorine in an amount determined as a function of the surface area of the alumina and of the mole content of tin in accordance with an equation herein specified.

Process for electrolytic removal of lubricants from steel strip

Abstract: A process for the electrolytic removal of lubricants from steel strip which significantly reduces the amount of power required while enhancing the degree of lubricant removal. The process comprises (i) electrolyzing the strip in an alkaline electrolyte by applying a current density within the range of 350 to 4,000 amps per square foot, and (ii) passing the strip lengthwise, at a speed of 450 to 3,000 feet per minute, between at least one pair of horizontally arranged electrodes in parallel spaced relation wherein the distance between a planar surface of the strip and its respective facing electrode is from one-fourth of an inch and no greater than 11/2 inches. The amount of power required is significantly reduced by flowing the electrolyte co-current with the direction of strip travel at a flow velocity which is from 50 to 100 percent of the strip speed.

Platinum-Rhenium-Alumina Catalysts. Variation of Physicochemical and Catalytic Properties with the Method of Preparation.

Abstract: Summary A study of the reduction with hydrogen of H 2 PtCl 6 and Re 2 O 7 codeposited on α or γAl 2 O 3 shows that the final state of the active components is mainly the metallic state. This result is also obtained when the coimpregnated solids are calcined before reduction. The activity per unit area of the metallic phase in the conversion of n-heptane seems nearly constant in a large composition range of the bimetallic catalysts while the selectivity for the formation of toluene is increased.

Thermostat switch for domestic appliances - has a bimetal element in the circuit to be switched as the temperature sensor

Abstract: The thermostat switch includes a drag spring carrying a contact in the load circuit It is sprung movable relative to the bimetallic strip Together with the bimetallic strip and controlled by a magnet, it carries out a snappy movement to or from a fixed contact The drag spring (10) is mounted in the side of the long bimetallic element (7) clamped at one end, facing the fixed contact When the contact is open, the drag spring end carrying the contact (13) is at a distance from the bimetallic strip and when the contacts (6, 13) are closed, it is parallel to the bimetal and pressed to it