Synthesis of chabazite-containing molecular sieves and their use in the conversion of oxygenates to olefins
A technology of molecular sieves and mixtures, which is applied in the direction of molecular sieve catalysts, hydrocarbon production from oxygen-containing organic compounds, silicoaluminophosphate with molecular sieve properties, etc. It can solve the problems of crystallization time difference and slow heating rate, etc.
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Embodiment approach 1
[0089] Embodiment 1. A method of preparing a silicoaluminophosphate molecular sieve having a desired crystal size comprising: (a) providing a synthesis mixture comprising an aluminum source, a phosphorus source, a silicon source, and at least one organic templating agent, The organic templating agent contains (i) a 4 to 8 membered cycloalkyl group optionally substituted by 1 to 3 alkyl groups having 1 to 3 carbon atoms, or (ii) a 4 to 8 membered cycloalkyl group having 1 to 3 heteroatoms A membered heterocyclic group, the heterocyclic group is optionally substituted by 1-3 alkyl groups having 1-3 carbon atoms, and the heteroatoms in the heterocyclic group are selected from O, N and S, wherein The synthetic mixture has a Si / Al of less than 0.33 2 (b) inducing crystallization of a silicoaluminophosphate molecular sieve exhibiting 90% or greater CHA framework type characteristics from said synthesis mixture by heating said synthesis mixture to a crystallization temperature at a h...
Embodiment approach 2
[0090] Embodiment 2. A method of converting hydrocarbons into olefins, comprising: (1) preparing a silicoaluminophosphate molecular sieve according to a method comprising the steps of: (a) providing a molecular sieve comprising an aluminum source, a phosphorus source, a silicon source and at least one Synthetic mixtures of organic templating agents containing (i) 4 to 8-membered cycloalkyl groups optionally substituted with 1-3 alkyl groups having 1-3 carbon atoms, or (ii) having 1-3 4 to 8-membered heterocyclic group of heteroatoms, the heterocyclic group is optionally substituted by 1-3 alkyl groups having 1-3 carbon atoms, and the heteroatoms in the heterocyclic group are selected from O, N, and S, (b) induce silicoaluminophosphate molecular sieves exhibiting 90% or greater CHA framework type characteristics to be formed from the crystallization of the synthesis mixture; and (c) crystallizing the silicoaluminophosphate molecular sieve at a crystallization temperature for 16...
Embodiment approach 3
[0091] Embodiment 3. A method of converting hydrocarbons to olefins comprising: (1) preparing a silicoaluminophosphate molecular sieve by a method comprising: (a) preparing a molecular sieve comprising an aluminum source, a phosphorus source, a silicon source and at least one A reaction mixture of an organic template containing (i) a 4 to 8-membered cycloalkyl group optionally substituted with 1-3 alkyl groups having 1-3 carbon atoms, or (ii) having 1-3 4 to 8-membered heterocyclic group of heteroatoms, the heterocyclic group is optionally substituted by 1-3 alkyl groups having 1-3 carbon atoms, and the heteroatoms in the heterocyclic group are selected from O, N and S, (b) heating the reaction mixture to a crystallization temperature in the range of 150°C to 225°C at a rate of less than 10°C / hour, (c) maintaining the reaction mixture in the crystallization temperature range A period of less than 10 hours to induce crystallization of the silicoaluminophosphate molecular sieve,...
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Abstract
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