Application of Activated Alumina as Adsorbent

The primary industrial applications of activated alumina as an adsorbent include gas monotonicity, liquid monotonicity, water purification, selective adsorption in the petroleum industry, and color separation processes.

Due to its strong affinity for water, activated alumina has widely used in gas monotonicity. The gases that can be monotonically with activated alumina include acetylene, cracking gas, coke oven gas, hydrogen, oxygen, air, ethane, hydrogen chloride, propane, ammonia, ethylene, hydrogen sulfide, propylene, argon, methane, sulfur dioxide, carbon dioxide, natural gas, helium, nitrogen, etc. Due to the significant amount of heat released during the adsorption of water by activated alumina, it is necessary to plan its application based on factors such as monotonic ability, monotonic speed, heat transfer, and regeneration methods.

Activated alumina can be as a monotonic liquid, mainly including aromatic hydrocarbons, high molecular weight olefins, gasoline, kerosene, cyclohexane, propylene, butene, and many halogenated hydrocarbons. When these liquids come into contact with alumina, they do not react or polymerize. Additionally, the monotonous liquid does not contain components that simply adsorbed on the surface of alumina and difficult to remove during regeneration.

In terms of water purification, activated alumina is not only primarily to remove fluoride from drinking water, but also effective in eliminating the color and odor of industrial wastewater. In addition, activated alumina widely used in the recovery and selective adsorption of carbohydrates, as well as in the maintenance of power system oils.

Application as Catalyst and Carrier

Aluminum oxide used as a catalyst carrier can summarize into the following types based on its physical and chemical properties and the effects of aluminum oxide:

(1) High temperature alumina carrier. This type of alumina has a small specific surface area, high temperature resistance, chemical resistance, and high mechanical strength, making it suitable for harsh operating conditions. Due to the laziness of alumina, high-temperature alumina supports do not become potential sources of side reactions and decreased selectivity, nor do they become potential sources of toxicity to the catalyst system.

(2) Interactive carrier. This type of alumina is the most widely used, as it can react with the active components of the catalyst to disperse them into the carrier, providing useful specific surface area and suitable pore structure for the active components to enhance the thermal stability and anti toxicity performance of the catalyst.

(3) Create a synergistic effect or dual functional carrier. This type of alumina not only serves as the skeleton of the active component, but also provides a gain effect for the catalytic effect of the catalyst.