Chemical reaction engineering is a claim to fame in chemical engineering or industrial science managing chemical reactors. Every now and again the term relates specifically to catalytic response systems where either a homogeneous or heterogeneous catalyst is available in the reactor. Here and there a reactor is not present by itself, but instead is integrated into a procedure, for example in receptive separations vessels, answers, certain energy cells, and photocatalytic surfaces. The issue of solvent effects for response energy is additionally considered as an integral part.