[Q&A Question 157] 2018.06.06

Dispersing active metal components on a carrier not only increases the surface area for catalytic activity but also reduces the cost of the catalyst; in many cases, it also enhances the catalyst’s stability. It is an important component of a catalyst’s structure, and its properties have a significant impact on the catalyst’s activity and selectivity

1. The carrier enables the active component to be dispersed on its surface, resulting in a higher specific surface area and thereby improving the catalytic efficiency per unit mass of the active component. 2. The carrier dilutes the active components in the catalyst to meet the thermal equilibrium requirements and maintain a high degree of dispersion of the active components ； 3. The carrier enables the resulting catalyst to have an appropriate shape, size, and mechanical strength to meet the operational requirements of industrial reactors ； 4. The carrier can also prevent the active components from sintering during use, thereby improving the heat resistance of the catalyst. Improve catalyst conductivity ； 5. Reduce the content of active components ； Provide additional active centers ； Improve the thermal stability of the catalyst. 【Catalyst carrier】, also known as a support, is one of the components of supported catalysts. The catalytically active components are supported on the surface of a carrier; the carrier is primarily used to support these active components and to endow the catalyst with specific physical properties, whereas the carrier itself generally does not possess catalytic activity. Most carriers are products from the catalyst industry; common ones include alumina carriers, silica gel carriers, activated carbon carriers, and certain natural substances such as pumice and diatomite. The composition of supported catalysts is commonly indicated as “name of active component – name of carrier”, such as nickel-alumina catalyst for hydrogenation and vanadium oxide-diatomite catalyst for oxidation.

Disperse the active metal component on the carrier

The highly dispersed catalyst active components have a strong tendency to aggregate under the influence of temperature, and are prone to agglomeration and sintering as the temperature rises； 1. Carriers that hold active components generally possess good thermal stability, and they can prevent the highly dispersed active components from coming into contact with each other, thereby raising the sintering temperature of the active components and enhancing the thermal stability of the catalyst ； 2. After the active components are dispersed on the carrier, ** increases the volume and surface area of the catalyst, thereby significantly improving its heat dissipation properties ； 3. Meanwhile, during the reaction process, the carrier increases the heat capacity of the catalyst, allowing the heat generated by the reaction to be dissipated promptly, thereby effectively suppressing the temperature rise in the catalyst bed.

Dispersing active metal components on a carrier not only increases the surface area for catalytic activity but also reduces the cost of the catalyst; in many cases, it also enhances the catalyst’s stability. It is an important component of a catalyst’s structure, and its properties have a significant impact on the catalyst’s activity and selectivity

1. The carrier enables the active component to be dispersed on its surface, resulting in a higher specific surface area and thereby improving the catalytic efficiency per unit mass of the active component. 2. The carrier dilutes the active components in the catalyst to meet the thermal equilibrium requirements and maintain a high degree of dispersion of the active components ； 3. The carrier enables the resulting catalyst to have an appropriate shape, size, and mechanical strength to meet the operational requirements of industrial reactors ； 4. The carrier can also prevent the active components from sintering during use, thereby improving the heat resistance of the catalyst. Improve catalyst conductivity ； 5. Reduce the content of active components ； Provide additional active centers ； Improve the thermal stability of the catalyst.

The carrier enables the resulting catalyst to have an appropriate shape, size, and mechanical strength to meet the operational requirements of industrial reactors； The carrier enables the active component to be dispersed on its surface, resulting in a higher specific surface area and thereby improving the catalytic efficiency per unit mass of the active component. The carrier can also prevent the active components from sintering during use, thereby improving the heat resistance of the catalyst. For certain highly exothermic reactions, a carrier dilutes the active components in the catalyst in order to meet the requirements of thermal equilibrium; a carrier with good thermal conductivity allows certain catalysts that were originally used in homogeneous reactions to be supported on a solid carrier, thereby forming solid catalysts.

1. The carrier enables the active component to be dispersed on its surface, resulting in a higher specific surface area and thereby improving the catalytic efficiency per unit mass of the active component. 2. The carrier dilutes the active components in the catalyst to meet the thermal equilibrium requirements and maintain a high degree of dispersion of the active components ； 3. The carrier enables the resulting catalyst to have an appropriate shape, size, and mechanical strength to meet the operational requirements of industrial reactors ； 4. The carrier can also prevent the active components from sintering during use, thereby improving the heat resistance of the catalyst. Improve catalyst conductivity ； 5. Reduce the content of active components ； Provide additional active centers ； Improve the thermal stability of the catalyst.

1. The carrier enables the active component to be dispersed on its surface, resulting in a higher specific surface area and thereby improving the catalytic efficiency per unit mass of the active component. 2. The carrier dilutes the active components in the catalyst to meet the thermal equilibrium requirements and maintain a high degree of dispersion of the active components ； 3. The carrier enables the resulting catalyst to have an appropriate shape, size, and mechanical strength to meet the operational requirements of industrial reactors ； 4. The carrier can also prevent the active components from sintering during use, thereby improving the heat resistance of the catalyst. Improve catalyst conductivity ； 5. Reduce the content of active components ； Provide additional active centers ； Improve the thermal stability of the catalyst.