Abstract:
A SCM-34 molecular sieve, preparation method therefor and use thereof are provided. The SCM-34 molecular sieve contains aluminum, phosphorus, oxygen and optionally silicon. In the XRD diffraction data of the molecular sieve, a 2θ degree of the strongest peak within the range of 5-50° is 7.59±0.2. The SCM-34 molecular sieve has a new skeleton structure and can be used to prepare a metal-containing AFI type molecular sieve or an SAPO-17 molecular sieve.
Abstract:
The application relates to processes and systems that use a furfural compound for producing five-membered carbocyclic rings that are unsaturated, such as cyclopentene and cyclopentadiene. Examples methods for conversion of furfural compounds may include converting a furfural compound to at least a five-membered, saturated carbocyclic ring, and converting the five-membered, saturated carbocyclic ring in a presence of a catalyst to at least a five-membered, unsaturated carbocyclic ring.
Abstract:
A process for preparing a fused-ring alkane fuel, wherein the fused-ring alkane fuel has the following structure: wherein n is 1 or 2; R1, R2, R3, R4 and R5 are H or —CH3 or —CH2CH3; the fused-ring alkane fuel has a density of greater than 0.870 g/cm3, a freezing point of not higher than −50° C., and a net mass heat value of not less than 42.0 MJ/kg; the process for preparing a fused-ring alkane fuel, wherein the process includes steps of: (1) in a presence of ultraviolet light and a photocatalyst, a Diels-Alder cycloaddition reaction between a substituted or unsubstituted cyclic enone and a substituted or unsubstituted furan molecule occurs to produce a fuel precursor molecule: (2) the fuel precursor molecule obtained in the step (1) is subjected to hydrodeoxygenation to produce the fused-ring alkane fuel.
Abstract:
A method for preparing a light olefin using an oxygen-containing compound, and a device for use thereof, more specifically, taking methanol and/or dimethyl ether as main starting materials, using a multi-stage (n≧2) dense phase fluidized bed reactor and a multi-stage (m≧2) catalyst regenerator, which solves the problem in the prior art of the uniformity of catalyst carbon deposition and the carbon content being difficult to control and the light olefin selectivity being low.
Abstract:
Disclosed is a method of preparing a calcium phosphate catalyst, which comprises reacting a calcium salt with a phosphoric acid salt in aqueous ammonia, separating the precipitate resulting from the reaction mixture thus obtained, suitably shaping said precipitate, drying it, and subjecting it to heat treatment within a temperature range of 450.degree. to 600.degree. C. in the presence of steam mixed with at least one of the components selected from the group consisting of an inert gas, air, phosphoric an acid, aldehyde, an oxygen-containing heterocyclic compound, an alcohol, and a diene hydrocarbon.The reaction of calcium salts with phosphoric acid salts in aqueous ammonia is effected with the starting reactants taken in the molar ratio of 1.5:1 if no phosphoric acid treatment is used, or with the starting reactants in a molar ratio within the range of 1.5:1 to 5.0:1 if the reaction mixture is treated with a phosphoric acid solution to a pH of from 5.0 to 7.0.
Abstract:
4,4-DIMETHYL-M-DIOXANE IS DECOMPOSED INTO ISOPRENE IN THE GASEOUS PHASE IN A FLUIDIZED BED OVER A CATALYST CONTAINING PHOSPHORIC ACID AND PREPARED BY SUSPENDING A SILICIC ACID FILLER HAVING A SPECIFIC SURFACE OF 30 TO 200 M.2/G. AND A KAOLINITE, MONTMORILLONITE OR ATTAPULGITE CLAY IN AN AQUEOUS STABLE SILICIC ACID SOL HAVING A SPECIFIC SURFACE AREA OF 150 TO 400 M.2/G. (DRY BASIS); ADDING TO THE RESULTING SUSPENSION A SUFFICIENT AMOUNT OF AN AQUEOUS SUSPENSION OF MAGNESIUM OXIDE TO SET THE SUSPENSION INTO BEADS; DRYING THE BEADS; HEATING THE BEADS TO 500 TO 1,000* C. FOR AT LEAST 10 MINUTES; ADDING THERETO 5 TO 30% PHOSPHORIC ACID; AND FURTHER HEATING THEM TO 300 TO 650*C.