34results about How to "Good shape selectivity" patented technology

The invention discloses a toluene and methanol alkylation catalyst and a preparation method and application thereof. A catalyst carrier contains a hydrogen-type ZSM-48 molecular sieve and a modified element which comprises one or several of lanthanum, magnesium, phosphorus and silicon, the content (in percentage by weight ) of the hydrogen-type ZSM-48 molecular sieve in the carrier is 10wt%-90wt%, and preferably 20wt%-80wt%; the modified element contains one or several of lanthanum, magnesium, phosphorus and silicon and is calculated according to oxides, and the modified element accounts for 0.05%-60% of the weight of the carrier, and preferably 0.5%-40%. The catalyst is used for an alkylation reaction of toluene and methanol, and has the characteristics that the conversion rate of the toluene is high, the selectivity of paraxylene is high, and the like.

The invention provides a catalytic cracking catalyst and a preparation method thereof, wherein the catalyst comprises 15-65% of natural minerals, 10-60% of an oxide, and 25-75% of a Y type molecular sieve and a phosphorus-containing and supported-metal-containing MFI-structure molecular sieve, wherein the n(SiO2)/n(Al2O3) of the phosphorus-containing and supported-metal-containing MFI-structure molecular sieve is more than 18 and less than 70, the Al distribution parameter D is more than or equal to 0.6 and is less than or equal to 0.85, the volume of the mesopores accounts for 50-80% of the total pore volume, the volume of the mesopores with the pore size of 2-20 nm accounts for more than 85% of the total mesopore volume, the amount of the strong acid accounts for 50-80% of the total acidamount, a ratio of the acid B to the acid L is 7-30, the phosphorus content is 1-15 wt%, and the supported metal content is 0.1-5 wt%. The preparation method comprises: carrying out mixing beating onthe phosphorus-containing and supported-metal-containing MFI-structure molecular sieve, the Y type molecular sieve, the natural minerals and an inorganic oxide binder, and carrying out spray drying.According to the present invention, the catalytic cracking catalyst has the high low-carbon olefin yield in the catalytic cracking of petroleum hydrocarbons.

The invention provides a catalytic cracking catalyst and a preparation method thereof, wherein the catalyst comprises 15-65% of natural minerals, 10-60% of an oxide, and 25-75% of a Y type molecular sieve and a phosphorus-containing IMF-structure molecular sieve, wherein the n(SiO2)/n(Al2O3) of the phosphorus-containing IMF-structure molecular sieve is more than 18 and less than 70, the phosphoruscontent is 1-15 wt%, the Al distribution parameter D is more than or equal to 0.6 and is less than or equal to 0.85, the volume of the mesopores accounts for 40-70% of the total pore volume, the volume of the mesopores with the pore size of 2-20 nm accounts for more than 85% of the total mesopore volume, the amount of the strong acid accounts for 45-75% of the total acid amount, and a ratio of the acid B to the acid L is 8-30. According to the present invention, the catalytic cracking catalyst has high low-carbon olefin yield and high BTX yield in the catalytic cracking of petroleum hydrocarbons.

The invention belongs to an inorganic micropore new-material drying agent. The novel drying agent is a silicate A-type molecular sieve which has the diffracting strength value I of more than 75 but less than or equal to 100 on the 110 surface at an angle of 10 degrees of the 2 theta angle of the XRD diffracting peak . Besides the properties of the glass drying agent in a 3A-type molecular sieve, the inorganic micropore new-material molecular-sieve drying agent prepared by new chemical modification technology of the invention has the structural characteristics that the diffracting strength of the peak structure of the 110 surface at an angle of 10 degrees of the 2 theta angle in the XRD diffracting plot is obviously stronger than that of the glass drying agent in a 3A-type molecular sieve, thus, the novel drying agent only absorbs water and little O2 but not N2 and has the property of excellent type selectivity and selective absorption.

The invention relates to a method for preparing 1,3-butadiene, and a catalyst is a transition metal-containing MFI type molecular sieve. A raw material ethanol is in contact with the catalyst in a fixed bed manner, and is converted into butadiene in one step, wherein the reaction temperature is 250 to 550 DEG C. One of transition metal components X is one or more of transition metals Zn, Ni, Fe, Cu, Ag and Au, and the other component Y is one or more of acidic or basic metals Mg, Zr, Y, Hf, La, Ce, Sn and In. The catalyst according to the invention has the advantages of simple preparation process, low cost and easy availability. The method achieves the purpose of preparing butadiene from ethanol at high conversion and high selectivity and has an obvious industrial application value for theprocess of preparing butadiene from ethanol.

The present invention discloses a catalyst in an alkylation reaction of ethylbenzene and ethanol. The catalyst comprises the following raw materials in percentages by weight: 10%-30% of aluminum oxide, and 70%-90% of a modified hydrogen form eutectic crystallization ZSM-5/ZSM-11 molecular sieve; and the modified hydrogen form eutectic crystallization ZSM-5/ZSM-11 molecular sieve is a citric acid modified hydrogen form ZSM-5/ZSM-11 molecular sieve. Moreover, the present invention also discloses a preparation method of the catalyst. The method comprises the following steps: firstly, kneading the raw materials and baking the raw materials to obtain a mixture; and secondly, roasting the mixture in steam atmosphere to obtain the catalyst. The catalyst disclosed by the present invention is used in the alkylation reaction of ethylbenzene and ethanol to prepare p-diethylbenzene, a high ethylbenzene (ethanol) conversion rate can be obtained, side reactions such as transalkylation can be greatly suppressed, and the selectivity of reaction products diethylbenzene and p-diethylbenzene are improved.

The invention relates to a catalytic reforming catalyst for catalytic pyrolysis of waste plastic for preparing fuel oil and a preparation method thereof. The catalyst consists of oxides and an MCM-22, ZSM-35, Beta or MOR molecular sieve, wherein the oxides are any two of molybdenum oxide, cerium oxide, bismuth oxide, zirconium oxide, tin oxide or lead oxide in a weight ratio of 1/10 to 10/1; and secondary catalytic pyrolysis, isomerization and an aromatized reforming reaction are performed on crude oil formed by cracking the waste plastic, so that the ratio of cracked gasoline fractions to cracked diesel fractions is increased. The catalyst of the invention has the advantages of high activity, high selectivity and particular suitability for pyrolysis of mixed waste plastic in urban and rural household garbage with complex components for preparing oil, wherein the yield of the qualified fuel oil is over 70 percent based on the weight of the waste plastic.

The invention relates to a catalytic cracking catalyst as well as a preparation method and application thereof. Based on the dry basis weight of the catalytic cracking catalyst, the catalytic crackingcatalyst comprises the following components in percentage by dry basis weight: 1-25wt% of Y-type molecular sieve, 5-50wt% of mesoporous-rich MFI structure molecular sieve, 1-60wt% of inorganic binderand optionally 0-60wt% of second clay, wherein the inorganic binder comprises a phosphorus-aluminum inorganic binder and/or other inorganic binders. The catalytic cracking catalyst provided by the invention has relatively high ethylene selectivity in a petroleum hydrocarbon catalytic cracking reaction.

The invention discloses a catalyst for preparing dimethylbenzene by converting methanol. The catalyst disclosed by the invention consists of a ZSM-5/EU-1 composite molecular sieve and boron, wherein the ZSM-5/EU-1 composite molecular sieve is 95-99.5wt% of the weight of the catalyst; the weight ratio of a ZSM-5 molecular sieve to an EU-1 molecular sieve is 1:(0.1-10); and the loading amount of the boron is 0.05-5wt% by measuring according to the element. Due to the mutual synergistic effect of different types of molecular sieves and non-metallic elements, the catalyst disclosed by the invention has a higher activity; and meanwhile, the selectivity of a target product dimethylbenzene for the dimethylbenzene is greatly improved, so that the catalyst disclosed by the invention can be applied to a process of preparing dimethylbenzene by converting methanol and has the advantage of being high in methanol conversion rate and dimethylbenzene selectivity.

The invention discloses a lamellar TS-1 molecular sieve. The lamellar TS-1 molecular sieve has an MFI topological structure, the axis b of the lamellar TS-1 molecular sieve is shorter than the axis a and the axis c of the lamellar TS-1 molecular sieve, and the thickness of the lamellar TS-1 molecular sieve is 50-500 nm. The invention also provides a preparation method and application of the lamellar TS-1 molecular sieve. The lamellar TS-1 molecular sieve is relatively small in size in the b-axis direction, so diffusion of guest molecules is facilitated, and the lamellar TS-1 molecular sieve has excellent catalytic performance. The straight pore channel direction (b-axis) of the TS-1 molecular sieve is a main molecular diffusion path, so the diffusion efficiency of the product is improved due to the thinner b-axis thickness.

The invention provides a method for eliminating acidity of an external surface of a ZSM-5 molecular sieve catalyst. The method comprises the following steps that 3,5-dimethylbromobenzene, a magnesium rod, iodine and tetrahydrofuran as raw materials undergo a reaction without water and oxygen to produce a 3,5-dimethylphenylmagnesium bromide Grignard reagent; the 3,5-dimethylphenylmagnesium bromide Grignard reagent is added with a molecular sieve n-hexane turbid liquid in a nitrogen atmosphere; the mixed solution is subjected to reflux at a temperature of 80 DEG C for 4 hours and then is dried by evaporation; and a sample obtained by the previous step is calcinated at a temperature in air to form a MgO-modified ZSM-5 molecular sieve catalyst. The MgO-modified ZSM-5 molecular sieve catalyst obtained by the method can be used for reactions such as a toluene disproportionation reaction, an ethylbenzene disproportionation reaction, a toluene carbonylation reaction and an ethylbenzene carbonylation reaction, wherein the reactions can selectively produce a certain product because of shape selectivity. The method has simple processes, a low cost and a wide application prospect.

The invention discloses a preparation method of methyl methacrylate, wherein the method comprises the steps: adding methylacrolein and methanol into an airtight continuous reactor, and sufficiently mixing until the mass concentration of methanol in the mixture is 45-80%; and adding a gold-based catalyst into the reactor in a stirring state, introducing an oxidant into the bottom of the reactor, controlling the reaction temperature to be 110-160 DEG C and the reaction pressure to be 0.5-2 MPa, and carrying out catalytic oxidation esterification to prepare methyl methacrylate. The preparation cost of the catalyst is reduced, the wear resistance of the catalyst is improved, the preparation conditions are more environment-friendly, and the catalytic activity is good. The methyl methacrylate product synthesized by catalysis has high yield and is not easy to polymerize in a reaction system.

The invention relates to a catalytic cracking catalyst, a preparation method of the catalytic cracking catalyst and a hydrocarbon oil catalytic cracking method. The catalyst contains 1-30 wt% of a Y-type molecular sieve based on dry basis weight, 5-55 wt% of a mesoporous-rich phosphorus and metal-containing MFI structure molecular sieve based on dry basis weight, 1-60 wt% of an inorganic binder based on dry basis weight, and optionally 0-60 wt% of second clay based on dry basis weight, wherein the inorganic binder comprises a phosphorus-aluminum inorganic binder and/or other inorganic binders.The catalyst provided by the invention has better ethylene selectivity in a petroleum hydrocarbon catalytic cracking reaction, and can produce more propylene and BTX at the same time.

The invention discloses a TS-1 molecular sieve with a macroporous-microporous composite pore channel structure. According to the invention, macropores and micropores are embedded in the TS-1 molecular sieve, and the pore diameters of the macropores are in a range of 50-500 nm. The TS-1 molecular sieve obtained by the method has the same excellent stability as a single crystal and an interpenetrating macroporous-microporous composite pore channel structure, the titanium content of the produced TS-1 molecular sieve can be controlled and adjusted in a wide range, the TS-1 molecular sieve shows excellent catalytic performance in an olefin epoxidation reaction, and the defect of a single microporous system is relieved.