Catalyst calcining furnace is the key equipment for catalyst calcination

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Catalyst calcining furnace is the key equipment for catalyst calcination

Catalyst roasting furnace is a key equipment for treating catalysts. The following is an analysis from the aspects of equipment type, technical characteristics, application scenarios, etc.:

I. Working principle:

The catalyst roasting furnace removes organic matter, moisture and other impurities in the catalyst through high-temperature heating, thereby improving the activity and stability of the catalyst. During the roasting process, the catalyst needs to be heated in a specific atmosphere (such as air, nitrogen or reducing atmosphere), and the temperature is usually between 400℃ and 700℃. In this process, impurities such as organic matter and moisture on the surface of the catalyst are oxidized or decomposed into gas and volatile substances, and desorbed and removed from the surface of the catalyst. At the same time, the roasting process can also promote the crystal growth and pore structure formation inside the catalyst.

II. Equipment type and process characteristics

A. Rotary kiln calcining furnace

1. Structure: It adopts an inclined rotating heating furnace tube, which is lined with refractory materials inside and realizes continuous rotation through gear drive.

Continuous rotary furnace Click on the picture for detailed introduction

2. Process advantages:

Uniform heating: The material realizes dynamic tumbling during the rotation process to avoid local overheating and ensure roasting uniformity.

Efficient mass transfer: countercurrent contact between airflow and material improves heat exchange efficiency and is suitable for large-scale continuous production.

Controllable atmosphere: supports air, nitrogen or reducing atmosphere to meet the roasting requirements of different catalysts.

Typical applications: crystal transformation and activation of molecular sieve catalysts and denitrification catalysts (such as honeycomb SCR catalysts) in petrochemicals.

B. Box-type/atmosphere muffle furnace

1. Structure: closed box design, electric heating or gas heating, equipped with a program temperature control system.

Experimental muffle furnace Click on the picture to view detailed introduction

2. Process advantages:

Precise temperature: suitable for laboratory small or pilot tests, with a temperature control accuracy of up to ±1°C.

Flexible atmosphere: inert gas or specific reaction atmosphere can be introduced to achieve oxidation, reduction or sulfidation treatment.

Batch processing: suitable for the research and development and production of multiple varieties and small batches of catalysts.

Typical applications: carrier pretreatment of precious metal catalysts (such as Pt/Al₂O₃), thermal setting after active component loading.

Production lift atmosphere furnace Click on the picture for detailed introduction

III. Key technical parameters and performance optimization

1. Temperature control

Range: Usually 400–1200℃, adjusted according to the catalyst type (such as molecular sieves require 550–650℃ crystal transformation, precious metal catalysts require 800–1000℃ sintering).

Precision: Industrial equipment requires within ±5℃, laboratory equipment needs to reach ±1℃.

Heating rate: One of the key parameters, too fast can easily lead to abnormal grain growth, too slow will increase energy consumption.

2. Atmosphere control

Oxidizing atmosphere (air/O₂): used to remove organic templates and decompose precursors.

Reducing atmosphere (H₂/N₂-H₂ mixed gas): prevent metal oxides from being over-oxidized, such as the reduction of loaded Ni catalysts.

Inert atmosphere (N₂/Ar): avoid volatilization or phase change of active components at high temperatures.

3. Residence time

Definition: The effective heating time of the material in the roasting zone directly affects the grain size and pore structure.

Optimization direction: Accurate control is achieved by adjusting the furnace length, mesh belt speed or rotary kiln speed.

IV. Application scenarios

Petrochemical:

Catalyst roasting furnaces are widely used in the petrochemical industry for catalyst activation, crystal transformation, oxidation, pyrolysis, reduction and other process.

Inorganic chemical industry:

Applicable to the roasting, calcination and drying of catalysts in the field of inorganic chemical industry.

Metallurgy:

In the metallurgical industry, it is used to process catalysts and related materials.

New energy materials

Fuel cell catalysts: Calcination promotes the combination of carbon carriers and Pt nanoparticles and improves durability.

Lithium-ion battery negative electrode materials: Calcination removes residual organic matter and improves the interlayer spacing and cycle performance of graphite.

Laboratory research:

Applicable to laboratories of universities and scientific research institutions for the preparation and performance research of catalysts.

The catalyst high temperature calcining furnace has a wide range of application scenarios and significant technical advantages. University laboratories and industrial production environments can effectively select and configure catalyst calcining furnace equipment suitable for their research and production needs.

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