Abstract:
A composition for use after reductive activation as a catalyst in the conversion of synthesis gas to hydrocarbons, the composition having formula: RuaAbCeOx, wherein A is an alkali metal, x is a number such that the valence requirements of the other elements for oxygen is satisfied, a is greater than zero and less than 5% w/w, based on the total weight of the composition, b is in the range from zero to 10% w/w, based on the total weight of the composition, and Ce and O constitute the remainder of the composition, is produced by the steps of: (A) adding a solution or solutions of soluble compounds of the metals ruthenium and cerium, and optionally also an alkali metal compound, to a solution of a precipitant comprising a carbonate and/or a bicarbonate and/or a hydroxide of an alkali metal or ammonium under conditions whereby there is formed a precipitate comprising ruthenium and cerium, and optionally also an alkali metal, in the form of compounds thermally decomposable to the metals and/or their oxides, and (B) recovering the precipitate obtained in step (A).
Abstract:
A manipulative device capable of remote operation has a nozzle head (1) having one or more nozzles adapted to eject a fluid stream having a component at right angles to the axis of the nozzle head. There is a flexible elongate hose (2) for connecting the nozzle head to a source of remote operation, such as a joystick arrangement (9). Also valves (6) capable of operation by tendons (3) parallel to the flexible elongate hose enables spatial positioning of the nozzle head by remote differential operation of the tendons. The device may be used in various applications for example borehole mining, paint spraying etc.
Abstract:
A solid carbonaceous fuel containing up to 10% wt of calcium compounds and 0.1 to 5% wt of added iron added as oxide, carbonate or elemental iron or as as substantially halogen and sulphate-free iron-containing substances forming iron oxide or carbonate under furnace conditions. The additives act synergistically to reduce NOx.
Abstract:
A composition for use after reductive activation as a catalyst for the conversion of synthesis gas to hydrocarbons having a carbon number greater than one, which composition has the formula: RuaAbCeOx wherein A is an alkali metal, x is a number such that the valence requirements of the other elements for oxygen is satisfied, a is greater than zero and less than 1% w/w, based on the total weight of the composition, b is in the range from zero to 10% w/w, based on the total weight of the composition, and Ce and O constitute the remainder of the composition, is produced by the process comprising the steps of: (A) bringing together in solution soluble salts of the metals ruthenium and cerium and a precipitant comprising a carbonate and/or bicarbonate and/or a hydroxide of an alkali metal or ammonium under conditions whereby there is formed a precipitate comprising ruthenium and cerium in the form of compounds thermally decomposable to their oxides, and (B) recovering the precipitate obtained in step (A). Also a process for the conversion of synthesis gas using the catalyst produced as aforesaid, optionally in combination with a zeolite.
Abstract:
Process for the production of synthesis gas and higher hydrocarbons in which a saturated hydrocarbon and an oxygen containing gas having a ratio of hydrocarbon to oxygen of greater than the stoichiometric ratio for complete combustion are introduced into a bed of an inert particulate material. The upward flow rate of the hydrocarbon/oxygen containing gas stream is sufficient to fluidise or to produce a spouting action of the bed material, whereby the particulate material is thrown up above the bed surface and subsequently falls back into the bed. The hydrocarbon and oxygen containing gas are ignited reacted together, and the products of the reaction withdrawn.
Abstract:
A composition suitable for use after activation as a catalyst or a support therefor in the conversion of synthesis gas to hydrocarbons comprising a porous, essentially amorphous framework matrix comprising at least one element present in the form of a hydrolysed compound thereof, for example silicon and aluminium, and distributed uniformly throughout the framework matrix at least one metal selected from Groups VIa and VIII of the Periodic Table, for example iron, cobalt, nickel and/or ruthenium. Also a process for the production of the composition involving a hydrolysis step and a process for converting synthesis gas to hydrocarbons using the activated composition as catalyst.
Abstract:
The hemicellulose content of a mixture of cellulose and hemicellulose is reduced by contacting the mixture with hemicellulase obtained by culturing the bacterium Saccharomonospora viridis in the abscence of a cellulase-producing organism.
Abstract:
A silanised layered clay comprising a layered clay chemically modified by incorporation therein of a silicon-containing residue inthe absence of a polymeric cationic hydroxy inorganic metal complex. The silanised layered clays are produced by hydrolysing a hydrolysable silicon compound, for example a tetraalkoxysilane, in the presence of the layered clay and in the absence of a polymeric cationic hydroxy inorganic metal complex. The resulting silanised layered clays are more thermally and/or hydrothermally stable than the layered clays from which they are derived.
Abstract:
Carboxylic acid esters are produced by reacting (i) carbon monoxide, (ii) a compound of the formula M(OR)x wherein M is either boron, silicon, aluminium, titanium or zirconium, x is the valency of M and R is a hydrocarbyl group and (iii) a hydrocarbyl halide, wherein the halide moiety is bromide, chloride or iodide, in the presence of a catalyst comprising one or more of the metals rhodium, iridium and cobalt in either elemental or compound form. When M is boron, silicon or aluminium and the halide moitey is cloride, there is preferably added a source of iodide.
Abstract:
Electric arc conversion process in which C1-C4 alkane is brought into contact with an electric arc and higher molecular weight carbonaceous material is brought into contact with the hot gas derived from the C1-C4 hydrocarbon in the vicinity of the arc.