IntroductionIn chemistry, the catalyst is a substance that increases the rate of reaction with itself and does not combine in the reaction. The purpose of this essay is to delve deeper into catalyst research, such as how catalyst works and example of catalyst. Furthermore, this research could be useful to students of international science foundations for review support. First, this essay will describe the Maxwell Boltzmann distribution diagram and give the meaning of collision theory, and then discuss the activation energy. Next, the activation complex will be explained using the enthalpy diagram and the catalyst pathway will be focused on. Subsequently, homogeneous and heterogeneous catalysts, their mechanisms and examples will be described. Finally, this essay will represent catalytic poisoning. Discussion The Maxwell-Boltzmann distribution According to Webchem (2005) the kinetic energy of atoms and molecules can be found using the formula Ke=1/2mv2, where m = mass and v= velocity. It can be seen that their kinetic energy depends on velocity, since all particles have the same mass. In the mixture of moving molecules, there are low particles that have very low energy, and also very fast particles that have high energy, as well as the speed of most particles is almost medium. However, there is no energy limit, and the energy is equal to zero, including particles that do not have much energy, as shown in Figure 1. Figure 1: Collision Theory From Figure 1, there is an activation energy that is a minimum kinetic energy that is necessary for the particles to participate in the reaction. According to (Ltd., 2014) The occurrence of a chemical reaction requires the collision of particles that have...... half of the paper......ontentid=1779[Accessed 3 April 2014].Clark, J., 2002. TYPES OF CATALYSIS. [Online]Available at: http://www.chemguide.co.uk/physical/catalysis/introduction.html[Accessed 3 April 2014].Ltd., TSRG, 2014. Review: Collision Theory. [Online]Available at: http://www.thestudentroom.co.uk/wiki/revision:collision_theory[Accessed 31 March 2014].Matthey, J., nd Johnson Matthey Catalysts. [Online]Available at: http://resources.schoolscience.co.uk/johnsonmatthey/page4.htm[Accessed 2 April 2014].University, P., nd Activation Energy. [Online]Available at: http://www.princeton.edu/~achaney/tmve/wiki100k/docs/Activation_energy.html[Accessed 1 April 2014].Webchem, 2005. The Maxwell-Boltzmann Distribution. [Online]Available at: http://www.webchem.net/notes/how_far/cinetica/maxwell_boltzmann.htm#The Maxwell-Boltzmann Distribution[Accessed 30 March 2014].