A kind of monolithic extruded nickel-based catalyst and its preparation method and application

A nickel-based catalyst, integral extrusion technology, applied in chemical instruments and methods, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc. It can solve the problems of machine power consumption and large pressure drop in the reactor bed, so as to achieve the effects of easy preparation and application, improved high temperature hydrothermal stability, and reduced power consumption.

Active Publication Date: 2019-06-18
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The granular catalyst is stacked, not only has a high heat capacity, is easy to wear and pulverize, but also has a large pressure drop in the reactor bed, which will inevitably increase the power consumption of the cycle compressor, resulting in an increase in the operating cost of the entire cycle process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1) Dry ball mill: Weigh γ-Al with particle size less than 10 mesh (0.25 mm) 2 o 3 860g of powder and 125g of ZrO 2 , 25g of SiO 2 Mixing and dry milling with a high-energy ball mill for 16 hours, the particle size of the mixed powder was measured to be 3.5 μm.

[0045] (2) Preparation of precursor solution: Ni(NO 3 ) 2 ·6H 2 O and La(NO 3 ) 3 ·6H 2 O is the precursor, Ni(NO 3 ) 2 solution and La(NO 3 ) 3 solution. Measure 5.00L Ni(NO 3 ) 2 solution and 0.31L La(NO 3 ) 3 The solution is ready for use.

[0046] (3) Preparation of extrusion aids: Measure 2.75L of 1M aluminum sol, 0.6L of 1M zirconium sol, and 0.4L of 1M silica sol as inorganic binder; 60g of methyl cellulose as organic binder; 50g Glycerin is used as a plasticizer; 50g of polyethylene glycol (PEG-4000) is used as a lubricant.

[0047] (4) Kneading process: move the certain ratio of extrusion aids obtained in step (3) together with the mixture obtained in steps (1) and (2) into a kneader...

Embodiment 2

[0052] (1) Dry ball mill: Weigh γ-Al with particle size less than 10 mesh (0.25 mm) 2 o 3 700g of powder and 125g of ZrO 2 Mixing and dry ball milling with a high-energy ball mill for 12 hours, the particle size of the mixed powder was measured to be 5.2 μm.

[0053] (2) Preparation of precursor solution: Ni(NO 3 ) 2 ·6H 2 O and La(NO 3 ) 3 ·6H 2 O is the precursor, Ni(NO 3 ) 2 solution and La(NO 3 ) 3 solution. Measure 9.33L Ni(NO 3 ) 2 solution and 0.31L La(NO 3 ) 3 The solution is ready for use.

[0054] (3) Preparation of extrusion aids: Measure 2.75L of 1M aluminum sol, 0.81L of 1M zirconium sol as inorganic binder; 50g of hydroxypropyl cellulose as organic binder; 30g of glycerol and 20g of Epoxidized linseed oil was used as a plasticizer; 50 g of scallop powder was used as a lubricant.

[0055] (4) The kneading process is the same as the step (4) of Example 1.

[0056] (5) Extrusion process is the same as embodiment 1 step (5).

[0057] (6) Drying an...

Embodiment 3

[0060] Step (1)-step (4) are the same as in Example 1.

[0061] (5) Extrusion process: Extrude the catalyst green body obtained in step (4) with an extruder and cut it into a cross-sectional shape of 40 × 40mm (length × width), a height of 60mm, and an interior of 400 holes per square inch. A catalyst intermediate with holes (400cpsi) and a through-hole wall thickness of 0.4mm.

[0062] (6) Drying and roasting: same as step (6) of Example 1. Obtain embodiment 3 catalyst, composition is 35.7%NiO-4.8%La 2 o 3 -9.5%ZrO 2 -2.3% SiO2 2 -47.7% γ-Al 2 o 3 (400cpsi).

[0063] The above catalyst is loaded into the middle of the methanation reactor, with 10vol.%H 2 -90vol.%N 2 The mixed gas is reduced at 500°C for 5 hours, and then the pressure is 3.0MPa, the temperature is 300°C, and the space velocity is 10000h -1 、H 2 / (3CO+4CO 2 ) was evaluated under the condition that the molar ratio was 1.13. Under the reaction conditions, the CO conversion rate was 99.2%, and the CO ...

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Abstract

The invention discloses an integrally extruded nickel-based catalyst as well as its preparation method and application. The catalyst is composed of an active component, a catalytic aid, an extrusion aid and a catalyst carrier; specifically, it includes the active component nickel, the catalytic aid lanthanum and the catalyst support γ-Al 2 o 3 with ZrO 2 、TiO 2 , SiO 2 A mixture of one or more of them; the above-mentioned components and extrusion aids such as binders, plasticizers and lubricants are mixed, ball milled, kneaded, extruded, dried, roasted and other processes to produce integral extrusion nickel base catalyst. The catalyst provided by the invention has parallel longitudinal channels, the pressure of the reaction bed is reduced, and the power consumption of the cycle compressor can be effectively reduced in the multi-stage cycle complete methanation reaction process of syngas; at the same time, the preparation process of the catalyst is simple, and it is modular in the use process Assembly, preparation and application are all easy to scale up.

Description

technical field [0001] The catalyst of the invention belongs to the technical field of syngas methanation, and in particular relates to an integral extruded nickel-based catalyst and its preparation method and application. Background technique [0002] Starting from the 3E principle, among the existing clean coal conversion technology routes, coal-to-natural gas has obvious advantages. Techno-economic analysis shows that coal-to-natural gas has the highest energy efficiency, up to 60%; water consumption is 0.69 kg / kcal, which is the least among all coal conversion technologies. In recent years, with the continuous growth of my country's demand for natural gas, it has also driven the development of my country's coal-to-natural gas related technologies. [0003] The main reactions in the process of producing natural gas from synthetic gas through methanation reaction are as follows: [0004] CO+3H 2 →CH 4 +H 2 O △ H 0 =-206kJ / mol (1) [0005] 2CO+2H 2 →CH 4 +CO 2 ΔH...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/83C07C1/04C07C9/04
Inventor 王树东孙天军袁中山张纯希周谨
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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