A Molecular CO2 Reduction Catalyst Based on Giant Polyoxometalate {Mo368}

Photocatalytic CO2 reduction in water is one of the most attractive research pursuits of our time. In this article we report a giant polyoxometalate {Mo368} based homogeneous catalytic system, which efficiently reduces CO2 to formic acid with a maximum turnover number (TON) of 27,666, turnover frequency (TOF) of 4,611 h−1 and external quantum efficiency of the reaction is 0.6%. The catalytic system oxidizes water and releases electrons, and these electrons are further utilized for the reduction of CO2 to formic acid. A maximum of 8.3 mmol of formic acid was observed with the loading of 0.3 μmol of the catalyst. Our catalyst material is also stable throughout the reaction. The starting materials for this experiment are CO2 and H2O and the end products are HCOOH and O2. The formic acid formed in this reaction is an important H2 gas carrier and thus significant in renewable energy research

Softoxometalate [{K_6.5Cu(OH)_8.5(H₂O)_7.5}_0.5@{K₃PW₁₂O₄₀}]_<i>n</i> (<i>n</i> = 1348–2024) as an Efficient Inorganic Material for CO₂ Reduction with Concomitant Water Oxidation

An immediate challenge for chemists is to devise different methods to trap chemical energy using light by reduction of carbon dioxide to a transportable fuel. To reach this goal the major obstacle lies in finding a suitable material that is abundant and possesses catalytic power to effect such reduction reaction and perform this reduction reaction without using any external photosensitizer. Here we report for the first time a softoxometalate based on a {[K_6.5Cu­(OH)_8.5(H₂O)_7.5]_0.5[K₃PW₁₂O₄₀]} metal oxide framework which is stable in reaction conditions that effectively performs photochemical CO₂ reduction reaction in water with a very high turnover number of 613 and TOF of 47.15 h^–1. We observe that during this reaction water gets oxidized to oxygen, while the electrons released directly go to CO₂ reducing it to formic acid. A detailed account of the characterization of the catalyst along with that of products of this reaction is reported

<span style="font-size:11.0pt;mso-bidi-font-size: 10.0pt;font-family:"Times New Roman";mso-fareast-font-family:"Times New Roman"; mso-ansi-language:EN-GB;mso-fareast-language:EN-US;mso-bidi-language:AR-SA" lang="EN-GB">Molybdenum oxide supported on COK-12: A novel catalyst for oxidative dehydrogenation of ethylbenzene using CO₂</span>

493-498P6m-type mesoporous silica (COK-12) prepared at quasi-neutral pH in a buffered medium using sodium silicate as a silica source has been used as a support to prepare a series of MoO3/COK-12 catalysts with variable MoO3 loadings by wet impregnation technique. Among these catalysts, 14 wt% MoO3/COK-12 with small particle size of MoO3 shows superior activity for the oxidative dehydrogenation of ethylbenzene to styrene in the presence CO2