Abstract: A horizontal drive circuit employed in CRT displays which uses a switch-mode power supply operating in a boost topology to generate the appropriate supply voltage needed by the horizontal drive circuit is provided. The boost power supply is integrated into the horizontal drive circuit which allows for low printed circuit board area, low cost, and good performance over many different horizontal frequencies.

Abstract: In accordance with an exemplary embodiment of the present invention, a cathode ray tube convergence circuit includes a low voltage power supply and a high voltage power supply. The cathode ray tube convergence circuit further includes a switching network which is adapted to switch between the low voltage power supply and the high voltage power supply. The switching network dissipates substantially no power during operation of the convergence circuit.

Abstract: A horizontal drive circuit employed in CRT displays which uses a switch-mode power supply operating in a boost topology to generate the appropriate supply voltage needed by the horizontal drive circuit is provided. The boost power supply is integrated into the horizontal drive circuit which allows for low printed circuit board area, low cost, and good performance over many different horizontal frequencies.

Abstract: An apparatus, for generating a power OFF/ON signal for a microprocessor which receives operating power from a secondary winding of a transformer, includes a detector for detecting the input voltage of the transformer. When this input voltage drops below a given threshold level, a low voltage detection circuit provided by the apparatus generates the power OFF/ON signal for the microprocessor. By detecting the input voltage as opposed to the operating power of the microprocessor, the apparatus allows the microprocessor sufficient time to perform its shut-down functions before the operating power drops below a minimum level.

Abstract: A horizontal deflection circuit includes circuitry for protecting the horizontal output transistor from failure due to an over-current condition. The circuitry includes a current detector for detecting the current in the collector-emitter path of the horizontal output transistor, and a interrupter for interrupting the drive signal to the horizontal output transistor when the detected current exceed a predetermined level.

Abstract: A gas stream from a reaction in which ethylene oxide is produced by reacting ethylene with oxygen which gas stream comprises oxides of nitrogen and steam the gas stream is cooled to condense water, condensed water is removed, and ethylene oxide is then recovered from the gas stream. A substantial amount of the oxides of nitrogen is removed from the gas stream during the condensation.

Abstract: A gas stream from a reaction in which ethylene oxide is produced by reacting ethylene with oxygen which gas stream comprises oxides of nitrogen and steam the gas stream is contacted with an aqueous alkaline quench solution and ethylene oxide is then recovered from the gas stream. A substantial amount of oxides of nitrogen is removed from the gas stream during the treatment with the quench solution.

Abstract: Methanol synthesis over a catalyst derived from an alloy of copper and/or a platinum group metal and a highly oxidizable metal such as a rare earth metal can be carried out at unusually low temperatures such as 70.degree. C. and using synthesis gas deficient in hydrogen. The process life of the catalyst is no longer if the starting alloy contains a further metal such as aluminum or manganese. The synthesis gas should preferably be very pure and substantially free of carbon dioxide and water vapor. The process can be advantageously carried out using the catalyst suspended in an inert liquid.

Abstract: A catalyst suitable for a carbon oxides conversion process comprises metallic copper and oxides of zinc and/or magnesium and has a copper metal surface area of at least 70 m.sup.2 per g of copper.Whereas conventional catalysts are normally made by forming an intimate mixture of discrete particles of compounds of copper, and zinc and/or magnesium, and optionally at least one other element such as aluminum, calcining the composition to convert the constituents to oxides and then subjecting the calcined composition to reduction conditions so that the copper compounds therein are converted to copper, the high copper area catalysts are made by a process in which the calcination stage is omitted so that the copper compounds in the intimate mixture are reduced to metallic copper without the intimate mixture being heated to a temperature above 250.degree. C.Where the catalyst is required in pelleted form, it is preferably pelleted after reduction.

Abstract: High surface area, e.g. precipitated, ammonia catalyst precursors are promoted with an alkali metal salt of a transition metal acid, e.g. potassium ferrate, ferrite, permanganate, ruthenate, chromate, or ferrocyanide. The use of such promoters in place of potassium carbonate enables the catalyst to be activated at lower temperatures thus reducing the risk of sintering of the active metal.

Abstract: An ammonia synthesis catalyst precursor having a high BET surface area and containing oxides of iron, cobalt, aluminum, and an alkali metal of atomic number equal to, or greater than, 19. On reduction the precursor gives a catalyst having a high initial activity relative to that of a catalyst obtained by reduction of a standard fused, cobalt-free, precursor.The precursor may be made by precipitation followed by calcination.

Abstract: A video display apparatus includes a diode modulator for correcting side pincushion raster distortion. The diode modulator drive circuit produces a vertical deflection rate parabolic voltage that modulates the horizontal deflection current to effect pincushion correction. The drive circuit includes a transistor that has its base bias established by the combination of a width control resistor and a diode. The diode has the same thermal characteristics as the transistor to provide accurate temperature compensation. A resistor is connected between the emitter of the transistor and a supply voltage to change the transistor bias point in order to enable the transistor to be cutoff.

Abstract: An iron oxide containing precursor to a catalyst, for e.g. ammonia synthesis having a surface area above 10 m.sup.2.g.sup.-1 also containing alumina and cobalt oxide. The latter serves to increase the catalytic activity and/or reduce the rate of decline of catalytic activity. For use as an ammonia synthesis catalyst precursor, an alkali metal, e.g. potassium, is preferably incorporated into the composition to promote catalytic activity. The composition may be made by precipitation followed by calcination.

Abstract: A pelleted iron oxide catalyst precursor wherein the iron oxide has an O/Fe atomic ratio in the range 1.2 to 1.4, a high surface area and a density of at least 2.6 g.cm.sup.-3. The precursor may be made by de-oxidizing, by heating in the presence of a steam/hydrogen mixture, an iron oxide composition made by precipitation and calcination, followed by pelleting after-de-oxidation.

Abstract: An iron oxide containing precursor to a catalyst for e.g. ammonia synthesis, having a surface area above 10 m.sup.2 .multidot.g.sup.-1 also containing alumina and an alkaline earth. The alkaline earth may be present as an alkaline earth aluminate. The composition may be made by precipitation followed by calcination. For use as an ammonia synthesis catalyst precursor, an alkali metal, e.g. potassium, is preferably incorporated into the composition to promote catalytic activity. The presence of "free" alkaline earth, as opposed to alkaline earth aluminate reduces the amount of alkali metal required.

Abstract: A substantially iron-free copper nitrate solution is made by dissolving a copper-containing solid catalyst composition such as a used copper-zinc oxide-alumina methanol synthesis catalyst in nitric acid and controlling the acid concentration at a level such that any iron oxide present in the composition remains substantially undissolved. The acid concentration during dissolution is preferably under 4 molar. Alternatively or additionally the terminal pH is greater than 1.0. The resulting solution is pure enough for reconversion to catalyst by co-precipitation.

Abstract: The Abstract of the Invention is a method of making a solution of the nitrates of iron and chromium from a spent catalyst containing oxides of iron and chromium, which method comprises:(a) dissolving the catalyst in sulphuric acid;(b) reacting the resulting sulphates solution with a source of nitrate ions and of cations of which the sulphate is of low solubility, whereby to precipitate such sulphate;(c) separating the sulphate, whereby to give a nitrates solution of low sulphate content.

Abstract: An oxychlorination catalyst contains a copper compound, magnesium oxide and aluminium oxide, and the copper compound is present as a distinct phase on a support in which at least part of the magnesium oxide is in combined form with alumina.

Abstract: The Abstract of the Invention is a method of making a solution of the nitrates of iron and chromium from a spent catalyst containing oxides of iron and chromium, which method comprises:(a) dissolving the catalyst in sulphuric acid;(b) reacting the resulting sulphates solution with a source of nitrate ions and of cations of which the sulphate is of low solubility, whereby to precipitate such sulphate;(c) separating the sulphate, whereby to give a nitrates solution of low sulphate content.

Abstract: A solution containing nitrates of iron and chromium is produced by reacting metallic iron or an iron alloy with nitric acid in the presence of a hexavalent chromium compound. The solution is the starting material for making an iron-chrome oxide catalyst for the shift reaction of carbon monoxide with steam.