3 hybridized highly symmetric CH4 with strong C-H bonds (434 kJ mol -1 ) requires very high temperature and also low selectivity in products and CO2 emission. The primary challenge in photo catalysis is to design catalysts that can efficiently utilize visible light in solar spectrum and to reduce insufficient selectivity and increase the yield of the desired product ethane and reduce undesired products like CO2. There has been an intense interest to find a green reaction for C-H activation of CH4. The non-oxidative coupling of CH4 (NOCM) to higher hydrocarbons is one way for breaking the C-H bond in CH4. The transition metal nano clusters (Ti, W, Mo, Fe, Ni, etc.) act as robust catalysts of the activation of C-H bonds. Metal nano clusters are extremely small particles, 1 to 10 nanometers in size, and are composed of atoms of a single metal element (mono-metal) or multiple ele-ments (alloys). The nano clusters adopt special atomic arrangements to reduce their surface energy, and their electronic structures become discretized compared to the continuous electronic structure in bulk metals. These discretization electronic levels in the metal clusters exhibit striking properties and characteristics. For the above mentioned reasons, the metal nano clusters have attracted much attention as new functional nanomaterial and promising candidates for various applications in the science and technology like catalysis, photoluminescence, biomedical and magnetism. In photo catalysis, the nano clusters were found to be promising compared to their bulk counterparts. In the 1970s, Fujishima and Honda discovered that water splitting could occur over titanium dioxide (TiO₂) under UV light irradiation, which sparked intense research in the fields of photocatalysis, photovoltaics and sensors. TiO₂ has a bandgap of 3.0-3.2 eV, which limits its ability to absorb light only in the UV region of the spectrum. The current study involves methane to ethane conversion via solar energy driven process on TiO2 nano cluster as the photocatalyst The TiO2 nano cluster used in our study was taken from anatase TiO2. The anatase TiO2 with (001) facet has been shown to be more active