One of the most important problems affecting the quality of life is global warming related to dissemination of greenhouse gases. Among these gases, carbon dioxide is a major greenhouse gas (GHG). This problem is caused by two reasons, high volume emission and high residence time of carbon dioxide in the atmosphere. Continued uncontrolled gas emission can cause extreme changes in climate all over the world and threaten the life. Research on reducing greenhouse gases emissions, including developing non-carbon energy sources, improving energy efficiency, and carbon dioxide capture and sequestration, has increased in recent years. Improving energy efficiency and using non-carbon energy sources are the most effective in the short term (next 20 years) to reduce greenhouse gases emissions. However, these methods are not usually applied. Thus, carbon dioxide removal and trapping them essential to prevent its release, Since carbon dioxide capture is the most expensive step of burning fuel gas removing process, it is important to find the other effective way. Carbon dioxide is a greenhouse gas that is released into the environment due to burning of fossil fuels and it can cause global climate warming, which may be disastrous to the environment. Carbon dioxide can be removed from flue gas and waste gas streams by various methods such as membrane separation, absorption with a solvent, and adsorption using molecular sieves. These methods, however, are costly and consume a lot of energy. One of the improved techniques for the removal of carbon dioxide is chemical absorption with solid regenerable sorbents. The potassium based sorbents used in this study were prepared by impregnating potasium carbonate on porous supports. The aim of this study is to evaluate the laboratory process of carbon dioxide capture from flue gas using potassium carbonate on titanium nano-oxide. The potassium-based sorbents used in this study were prepared by impregnating potasium carbonate on nano titanium oxide support produced by sol-gel method in optimized conditions to maximize carbon dioxide capture capacity. For this purpose, in first step, different types of sorbents are produced by sol-gel technique. In the second step, a fixed bed reactor was used to determine the carbon dioxide removal efficiency by comparing the carbon dioxide content of the feed and product gases. It is composed of a reactor, a gas flow system, an applied test systems single zone split-tube furnace, and a gas chromatograph (GC). After the fixed bed reactor testing and optimization of absorber conditions, Sorbent special properties such as surface area, size distribution and chemical component are measured by appropriate tests Such as X-ray diffraction (XRD) and SEM, BET techniques.To optimize the condition of sorbent production, calcinations temperature was set at 550 degree celsius, gel residency duration for 12.75 hours and mixer speed equal to 30 rounds per minute. These parameters were set to maximize produced solid absorption equal to 86.36 mg/lit. The most important result of these tests (with optimal condition) represented that the size of sorbent particles are 6.13‌nm and the surface area is 36 m 2 /gr. Keyword : carbon dioxide, nano particle, chemical solid absorber, experimental design, sol-gel