36results about "Aluminosilicate zeolite type-L" patented technology

The invention discloses Ba hetero atom-containing LTL molecular sieve and a preparation method thereof. The preparation method of the molecular sieve comprises the following steps: a barium source, inorganic base, an aluminium source, a silicon source, water and alcohol are mixed according to a mol ratio in order to obtain sol, aging and crystallization are carried out in order, obtained solid is separated, washing and drying are carried out, and after roasting, the molecular sieve is obtained. The molecular sieve is advantageous in that: 1. the synthetic method is simple, single kettle yield is high, and synthesis and operation cost are low; 2. the product has good degree of crystallization, purity, and structured morphology; 3. the Ba hetero atom-containing LTL molecular sieve is used in an aromatization reaction of normal paraffins, and can obviously improve yield of aromatic hydrocarbons, especially yield of C8 aromatic hydrocarbons, and the molecular sieve has good application prospects.

The invention provides L-zeolite. Chemical composition of the L-zeolite is (0.8-5)K2O:Al2O3:(5-20)SiO2, average diameter d of the L-zeolite crystal grains is 0.1-2.0 mu m, and morphology index R is 0.2-1; in crystal grain integrity distribution, crystal grains with the morphology index R being 0.2-0.3 account for 3%-30% by mass of total quantity of the crystal grains, crystal grains with the morphology index R being 0.3-0.7 account for 40%-65% by mass of the total quantity of the crystal grains, and crystal grains with the morphology index R being 0.7-1.0 account for 10%-57% by mass of the total quantity of the crystal grains. The zeolite has higher crushing strength after being molded, and a Pt supported catalyst has higher alkane aromatization activity and selectivity and good active stability.

This invention relates to a process for producing aluminum silicates in the form of zeolite L, as well as the intermediate and end products of this process. The invention further relates to the use of these aluminum silicates for the conversion or adsorption of hydrocarbons.

The invention discloses a hierarchical pore LTL molecular sieve as well as a synthetic method and application thereof. The preparation method of the LTL molecular sieve comprises the following steps:(1) preparing a mixed aqueous solution of an aluminum source and a potassium source; (2) sequentially adding a silicon source and aqueous solution of polyethylene glycol into the mixed aqueous solution, and aging to obtain an initial sieve sol mixture; and (3) sequentially performing constant temperature crystallization and calcination on the initial sieve sol mixture, thereby obtaining the product. The synthetic method of the hierarchical pore LTL molecular sieve disclosed by the invention is simple, and the synthetic process is non-toxic and harmless. The LTL molecular sieve has a hierarchical pore structure, and mesopores of the molecular sieve are concentrated at 2-7nm; and the hierarchical pore LTL molecular sieve disclosed by the invention has excellent catalytic performance in an N-octane aromatization reaction, and compared with the traditional micro-porous LTL catalyst, the hierarchical pore LTL molecular sieve is capable of improving the aromatic yield by 20% or higher and has excellent industrial application prospects.

The invention relates to a germanium-containing L-type molecular sieve and a preparation method thereof. The chemical composition of the molecular sieve is: (0.8‑1.3)M·(0.001‑0.007)GeO 2 ·Al 2 o 3 ·(4-7)SiO2 2 , where M is K 2 O or K 2 O and Na 2 A combination of O. The L-type molecular sieve provided by the invention is used for preparing an aromatization catalyst, and has good aromatization conversion rate, target aromatic hydrocarbon yield and stability.