Composite catalyst, method for producing composite catalyst, method for producing lower olefin and method for regenerating composite catalyst

Patent metadata

Field	Value
Publication number	US-10556229-B2
Application number	US-201515501088-A
Country	US
Kind code	B2
Filing date	Jul 31, 2015
Priority date	Aug 1, 2014
Publication date	Feb 11, 2020
Grant date	Feb 11, 2020

Abstract

A lower olefin by using a zeolite catalyst, a composite catalyst capable of further extending the lifetime of catalytic activity, a method for producing the composite catalyst, a method for producing a lower olefin by using the composite catalyst, and a method for regenerating a composite catalyst in the method for producing a lower olefin are provided. The composite catalyst is a catalyst for producing a lower olefin from a hydrocarbon feedstock. This composite catalyst is constituted of a zeolite being a crystalline aluminosilicate containing gallium and iron or iron and further having a framework with 8- to 12-membered ring, and of silicon dioxide. By using the composite catalyst, a lower olefin can be continuously produced over a long period of time.

First claim

The invention claimed is:

1. A composite catalyst for producing a lower olefin from a hydrocarbon feedstock, comprising:
a zeolite being a crystalline aluminosilicate containing gallium and iron or iron in the framework of the zeolite and further having a framework with 8- to 12-membered ring; and
silicon dioxide,
wherein
when the zeolite is a crystalline aluminosilicate containing iron and gallium, and
an acid density as a composition ratio of the number of moles of silicon to a sum of the number of moles of iron, gallium, and aluminum is 75.0 to 200.0, a composition ratio of the number of moles of gallium to a sum of the number of moles of iron, gallium, and aluminum is 0.1 to 0.4, and a composition ratio of the number of moles of iron to a sum of the number of moles of iron, gallium, and aluminum is 0.2 to 0.6,
and
when the zeolite is a crystalline aluminosilicate containing iron, and
an acid density as a composition ratio of the number of moles of silicon to a sum of the number of moles of iron and aluminum is 75.0 to 200.0, and a composition ratio of the number of moles of iron to a sum of the number of moles of iron and aluminum is 0.4 to 0.7.

2. The composite catalyst according to claim 1 , wherein
the zeolite is a crystalline aluminosilicate containing iron and gallium, and
an acid density as a composition ratio of the number of moles of silicon to a sum of the number of moles of iron, gallium, and aluminum is 75.0 to 200.0, a composition ratio of the number of moles of gallium to a sum of the number of moles of iron, gallium, and aluminum is 0.1 to 0.4, and a composition ratio of the number of moles of iron to a sum of the number of moles of iron, gallium, and aluminum is 0.2 to 0.6.

3. The composite catalyst according to claim 1 , wherein
the zeolite is a crystalline aluminosilicate containing iron, and
an acid density as a composition ratio of the number of moles of silicon to a sum of the number of moles of iron and aluminum is 75.0 to 200.0, and a composition ratio of the number of moles of iron to a sum of the number of moles of iron and aluminum is 0.4 to 0.7.

4. The composite catalyst according to claim 1 , wherein
a concentration of the silicon dioxide is 5 to 50 wt %.

5. A method for producing the composite catalyst according to claim 1 , comprising:
a hydrothermal synthesis process, a molding process, and an ion exchange process.

6. The method for producing the composite catalyst according to claim 5 , wherein
in the molding process, an alkaline aqueous solution containing starch is used in molding a mixture of a zeolite and silicon dioxide.

7. A method for producing a lower olefin, producing comprising contacting a hydrocarbon feedstock with the composite catalyst according to claim 1 , wherein
a gas containing 15 wt % or more of the hydrocarbon feedstock is supplied to the composite catalyst, and the producing of the lower olefin from the hydrocarbon feedstock proceeds in a temperature range of 530° C. to 650° C.

8. A method for producing a lower olefin, producing comprising contacting a hydrocarbon feedstock with the composite catalyst according to claim 1 , wherein
a gas containing 15 wt % or more of the hydrocarbon feedstock is supplied to the composite catalyst, and a contact time of the hydrocarbon feedstock with the composite catalyst is 0.08 to 1.0 h.

9. The method for producing a lower olefin according to claim 7 , further comprising a regenerating step, wherein
air diluted with inert gas is supplied to the composite catalyst, and deposited carbon is burned and removed in a temperature range of 450° C. to 600° C.

10. The composite catalyst according to claim 1 , wherein
the zeolite is an MFI zeolite.

11. The composite catalyst according to claim 1 , wherein
a concentration of the silicon dioxide is 5 to 40 wt %.

Assignees

• Chiyoda Corp

Inventors

• Hodoshima Shinya
• Yagi Fuyuki
• Motomiya Azusa
• Wakamatsu Shuhei

Classifications

• B01J2229/42

  Addition of matrix or binder particles · CPC title

• C07C2529/76

  Iron group metals or copper · CPC title

• C10G11/05

  Crystalline alumino-silicates, e.g. molecular sieves · CPC title

• B01J29/76 Primary

  Iron group metals or copper · CPC title

• B01J37/0018

  Addition of a binding agent or of material, later completely removed among others as result of heat treatment, leaching or washing,(e.g. forming of pores; protective layer, desintegrating by heat) · CPC title