A kind of rare earth Y-type molecular sieve and preparation method thereof

Abstract

A rare earth Y-type molecular sieve, characterized in that (i) there are at least two kinds of mesopore pore size distributions at 2-3nm and 3-4nm; (ii) in the BJH pore size distribution curve, the peak area of ​​the 2-3nm mesopore pore size distribution is the same as the The peak area ratio of the 3-4nm mesopore pore size distribution is greater than 0.05. The molecular sieve has higher hydrothermal structure stability and cracking activity stability, and low coke selectivity.

Description

technical field

[0001] The invention relates to a rare earth Y-type molecular sieve and a preparation method thereof. Background technique

[0002] Catalytic cracking is the most important production technology in today's refineries, and catalytic cracking units are used to convert heavy oils and residues into gasoline, diesel and light gas components. In industry, the catalytic cracking unit must include two parts: reaction and catalyst high-temperature regeneration. Therefore, the catalyst needs to consider factors such as catalytic activity and selectivity. Compared with other types of molecular sieves, Y-type molecular sieves are more used in cracking reactions. As the active component of catalytic cracking catalyst, its main role in catalytic cracking catalyst is responsible for the production of gasoline range molecular products.

[0003] Rare earth exchanged rare earth Y molecular sieve is a highly active component of catalytic cracking catalyst. The rare earth ions...

Examples

Embodiment 1

[0026] Take 100g NaY molecular sieve (Changling Branch of Sinopec Catalyst Company, 74.1% by weight on ignition, 89.3% crystallinity, the same below) and 1800g deionized water to mix and beat, add 20ml of concentration to 357gRE 2 O 3 / L rare earth chloride salt solution and 2g ammonium chloride solid, stir evenly, heat up to 70°C, adjust the pH value of the slurry to 4.5 with dilute hydrochloric acid, and stir at constant temperature for 1h. After filtration, washing and drying, external pressure was applied and water was added to make it calcined at 500°C, apparent pressure 0.3Mpa, and 100% water vapor atmosphere for 2h to obtain the product, which is denoted as PAY-1.

[0027] In the chemical composition of PAY-1, rare earth oxide is 10.1% by weight.

[0028] figure 1 The pore size distribution curve calculated according to the BJH model for PAY-1. from figure 1 It can be seen that there are at least two kinds of mesopore size distributions, which are at 2-3 nm and 3-4 nm...

Embodiment 2

[0040] Take 100g NaY molecular sieve and 1000g deionized water, mix and beat, add 16ml concentration to 357gRE 2 O 3 / L rare earth chloride salt solution and 8g ammonium chloride solid, stir evenly, heat up to 60°C, adjust the pH value of the slurry to 4.0 with dilute hydrochloric acid, and stir at constant temperature for 1.5h. After filtration, washing and drying, external pressure was applied and water was added to make the sample hydrothermally calcined at 430°C, apparent pressure 0.8Mpa, and 50% water vapor for 0.5h to obtain a sample, which was designated as PAY-2.

[0041] In the chemical composition of the PAY-2 molecular sieve, the rare earth oxide is 8.2% by weight.

[0042] The BJH pore size distribution curve and XRD pattern of PAY-2 are the same as figure 1 , 2 Characteristics.

[0043] In the BJH pore size distribution curve, the ratio of the peak area of ​​the 2-3 nm pore size distribution to the peak area of ​​the 3-4 nm pore size distribution is 0.3.

[0...

Embodiment 3

[0046] Take 100g of NaY molecular sieve and 2200g of deionized water to mix and beat, add 24ml of concentration to 357gRE 2 O 3 / L rare earth chloride salt solution, stir evenly, heat up to 70 °C, adjust the pH value of the slurry to 3.5 with dilute hydrochloric acid, and stir at constant temperature for 1 h. After filtration, washing and drying, external pressure was applied and water was added to make it hydrothermally calcined at 520°C, apparent pressure 0.4Mpa, and 100% steam atmosphere for 1.5h to obtain the product, denoted as PAY-3.

[0047] In the chemical composition of PAY-3, rare earth oxide is 11.4% by weight.

[0048] The BJH pore size distribution curve and XRD pattern of PAY-3 are the same as figure 1 , 2 Characteristics.

[0049] In the BJH pore size distribution curve, the ratio of the peak area of ​​the 2-3 nm pore size distribution to the peak area of ​​the 3-4 nm pore size distribution is 0.25.

[0050] XRD spectrum test the intensity I of its 2θ=11.8±...

technical field

[0001] The invention relates to a rare earth Y-type molecular sieve and a preparation method thereof. Background technique

[0002] Catalytic cracking is the most important production technology in today's refineries, and catalytic cracking units are used to convert heavy oils and residues into gasoline, diesel and light gas components. In industry, the catalytic cracking unit must include two parts: reaction and catalyst high-temperature regeneration. Therefore, the catalyst needs to consider factors such as catalytic activity and selectivity. Compared with other types of molecular sieves, Y-type molecular sieves are more used in cracking reactions. As the active component of catalytic cracking catalyst, its main role in catalytic cracking catalyst is responsible for the production of gasoline range molecular products.

[0003] Rare earth exchanged rare earth Y molecular sieve is a highly active component of catalytic cracking catalyst. The rare earth ions...

Examples

Embodiment 1

[0026] Take 100g NaY molecular sieve (Changling Branch of Sinopec Catalyst Company, 74.1% by weight on ignition, 89.3% crystallinity, the same below) and 1800g deionized water to mix and beat, add 20ml of concentration to 357gRE 2 O 3 / L rare earth chloride salt solution and 2g ammonium chloride solid, stir evenly, heat up to 70°C, adjust the pH value of the slurry to 4.5 with dilute hydrochloric acid, and stir at constant temperature for 1h. After filtration, washing and drying, external pressure was applied and water was added to make it calcined at 500°C, apparent pressure 0.3Mpa, and 100% water vapor atmosphere for 2h to obtain the product, which is denoted as PAY-1.

[0027] In the chemical composition of PAY-1, rare earth oxide is 10.1% by weight.

[0028] figure 1 The pore size distribution curve calculated according to the BJH model for PAY-1. from figure 1 It can be seen that there are at least two kinds of mesopore size distributions, which are at 2-3 nm and 3-4 nm...

Embodiment 2

[0040] Take 100g NaY molecular sieve and 1000g deionized water, mix and beat, add 16ml concentration to 357gRE 2 O 3 / L rare earth chloride salt solution and 8g ammonium chloride solid, stir evenly, heat up to 60°C, adjust the pH value of the slurry to 4.0 with dilute hydrochloric acid, and stir at constant temperature for 1.5h. After filtration, washing and drying, external pressure was applied and water was added to make the sample hydrothermally calcined at 430°C, apparent pressure 0.8Mpa, and 50% water vapor for 0.5h to obtain a sample, which was designated as PAY-2.

[0041] In the chemical composition of the PAY-2 molecular sieve, the rare earth oxide is 8.2% by weight.

[0042] The BJH pore size distribution curve and XRD pattern of PAY-2 are the same as figure 1 , 2 Characteristics.

[0043] In the BJH pore size distribution curve, the ratio of the peak area of ​​the 2-3 nm pore size distribution to the peak area of ​​the 3-4 nm pore size distribution is 0.3.

[0...

Embodiment 3

[0046] Take 100g of NaY molecular sieve and 2200g of deionized water to mix and beat, add 24ml of concentration to 357gRE 2 O 3 / L rare earth chloride salt solution, stir evenly, heat up to 70 °C, adjust the pH value of the slurry to 3.5 with dilute hydrochloric acid, and stir at constant temperature for 1 h. After filtration, washing and drying, external pressure was applied and water was added to make it hydrothermally calcined at 520°C, apparent pressure 0.4Mpa, and 100% steam atmosphere for 1.5h to obtain the product, denoted as PAY-3.

[0047] In the chemical composition of PAY-3, rare earth oxide is 11.4% by weight.

[0048] The BJH pore size distribution curve and XRD pattern of PAY-3 are the same as figure 1 , 2 Characteristics.

[0049] In the BJH pore size distribution curve, the ratio of the peak area of ​​the 2-3 nm pore size distribution to the peak area of ​​the 3-4 nm pore size distribution is 0.25.

[0050] XRD spectrum test the intensity I of its 2θ=11.8±...

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