Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Preparation method of composite catalyst for hydrogenation of coal tar

A technology of composite catalyst and coal tar, applied in the field of coal chemical industry, can solve problems such as low recycling efficiency, and achieve the effects of convenient filling, good activity and high catalytic efficiency

Inactive Publication Date: 2012-10-03
韩钊武
View PDF2 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a preparation process of a composite catalyst for coal tar hydrogenation in order to solve the disadvantages of low recycling efficiency of traditional coal tar hydrogenation catalysts and must be replaced after a period of reaction

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] At room temperature, 5.69g of nickel nitrate (Ni(NO 3 ) 2 ·6H 2 O) and 1.38g ammonium molybdate (NH 4 ) 6 Mo 7 o 24 4H 2 O) be made into solution, add the diammonium hydrogen phosphate (NH of 3.45g ) 2 HPO 4 ), and adjust the pH value to about 2-3 with concentrated nitric acid. Then 8.1 g of MCM-41 molecular sieves were added to the solution, impregnated for 12 h, dried at 120° C. for 5 h, and then calcined at 500° C. in air for 8 h to obtain an oxide precursor. The phosphide oxide precursor was prepared by temperature-programmed reduction in a U-shaped tube. The heating program was as follows: from room temperature to 120°C and kept for 1h, then raised to 400°C at a rate of 5°C / min, kept for 1h, then raised to 500°C at a rate of 1°C / min, kept for 3h. h 2 The flow rate was 150 mL / min. The temperature of the catalyst prepared by the temperature-programmed reduction method was lowered to room temperature, with O 2 O with a content of 0.5-1.0% (volume fraction...

Embodiment 2

[0017] At room temperature, 5.69g of nickel nitrate (Ni(NO 3 ) 2 ·6H 2 O) and 1.5g ammonium molybdate (NH 4 ) 6 Mo 7 o 24 4H 2 O) make solution, add 2.079 diammonium hydrogen phosphate (NH4) 2 HPO 4 ), and adjust the pH value to about 2-3 with concentrated nitric acid. Then, 6.09 g of γ-type molecular sieves were added into the solution, impregnated for 18 h, dried at 110° C. for 8 h, and then calcined at 700° C. in air for 6 h to obtain an oxide precursor. The phosphide oxide precursor was prepared by temperature-programmed reduction in a U-shaped tube. The heating program is as follows: from room temperature to 100°C and maintain for 2h, then increase the temperature at a rate of 3°C / min to 450°C, maintain for 1h, then increase the rate of temperature to 600°C at a rate of 1°C / min, and maintain for 3h. h 2 The flow rate was 120 mL / min. The temperature of the catalyst prepared by the temperature-programmed reduction method was lowered to room temperature, and the ...

Embodiment 3

[0020] At room temperature, 5.6g of nickel nitrate (Ni(NO 3 ) 2 ·6H 2 O) and 1.8g ammonium molybdate (NH 4 ) 6 Mo 7 o 24 4H 2 O) make solution, add 2.079 diammonium hydrogen phosphate (NH4) 2 HPO 4 ), and adjust the pH value to about 2-3 with concentrated nitric acid. Then 6.75g of mordenite was added into the solution, impregnated for 12h, dried at 130°C for 2h, and then calcined at 800°C in air for 4h to prepare the oxide precursor. The phosphide oxide precursors were prepared by temperature-programmed reduction in a fixed-bed reactor. The heating program was as follows: from room temperature to 120°C and kept for 1 h, then raised to 400°C at a rate of 4°C / min, kept for 1h, then raised to 650°C at a rate of 2°C / min, and kept for 3h. h 2 The flow rate was 100 mL / min. The temperature of the catalyst prepared by the temperature-programmed reduction method was lowered to room temperature, and pure NH 3 The nickel phosphide catalyst was passivated for 5h to obtain th...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a preparation method of a composite catalyst for hydrogenation of coal tar, belonging to the technical field of coal chemical industry. The preparation method provided by the invention comprises the steps of: mixing nickel nitrate, ammonium molybdate and diammonium hydrogen phosphate to prepare a solution and adjusting pH value of the solution to be 2-3, and adding a molecular sieve into the solution, dipping, drying and baking the molecular sieve in air and obtaining an oxide precursor; raising the temperature of the oxide precursor from room temperature to 100-120 DEG C and keeping the temperature for 1-3h, raising the temperature to 400-500 DEG C and keeping the temperature for 0.5-2h, then raising the temperature to 550-650 DEG C and keeping the temperature for 1-5h, and reducing the temperature to room temperature in the H2 (hydrogen gas) atmosphere; and passivating the catalyst obtained in the second step by passivation gas at the flow rate of 1-5mL / min to obtain the target product. The catalyst prepared by the method has the characteristics of good activity, strong resistance to sulphur and high catalysis efficiency, and is recycled repeatedly.

Description

technical field [0001] The invention relates to a method for preparing a coal tar hydrogenation composite catalyst, which belongs to the technical field of coal chemical industry. Background technique [0002] Using coal tar as raw material oil and adopting suitable hydrorefining methods to produce clean fuels or petroleum products equivalent to petroleum products has obvious social benefits in the context of my country's growing demand for gasoline and diesel. CN200610028263.9, CN1464031A, CN1772846A, CN1147575C, US4855037 all disclose a coal tar hydrogenation upgrading process and catalyst, the process generally adopts a two-stage gradation catalyst loading scheme, the catalyst is divided into two layers, the upper part is equipped with a protective agent, The lower part is the hydrorefining catalyst. Or adopt a three-stage gradation catalyst loading scheme, the catalyst is divided into three layers, the upper part is the protective agent, the middle is the hydrofining ca...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/78B01J29/16B01J29/26B01J29/80C10G67/02
Inventor 韩钊武
Owner 韩钊武
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com