Organic Reactions Of The Functionalized Mesoporous Materials And Their Cleaning Applications

With the development of the society, the environmental pollution has become one of the most concerns. In order to solve the problem, it is critical to find a high efficient green catalyst since more than 90 percent of the chemical reaction was realized through catalysis. Though high efficiency, the homogeneous catalyst inevitably causes great pollution to the environment. While the heterogeneous catalyst is easy to separate from the system and reuse for several times, it can greatly reduce the cost and pollution as well, therefore it is reasonable to immobilize the homogeneous catalyst onto an inert support like mesoporous material because of its high surface area, ordered pore channel.In the light of green chemistry, a series of mesoporous catalysts were synthesized with different structure and morphology, which were applied in different c-c coupling reactions. By analyzing the result of activity and materials, we are able to investigate the relationship between the efficiency and structure.1 A new organometallic heterogeneous catalyst with crystal-like wall was synthesized through surfactant induced self assembly under acid condition using Pd(II) organometallic silane and 4,4'-Bis(triethoysiyl)-1,1'-biphenyl as the precursors. When used in the water-medium Barbier reaction, the catalyst exhibited both high activity and strong stability due to the strong hydrophobicity and crystal-like wall structure.2 Under basic condition, the diphenylphosphine functionalized mesoporous sphere catalyst with short pore channel was obtained using CTAB as the surfactant. Through post-grafting, the Pd(PPh3)2Cl2 or Rh(PPh3)3Cl were successfully immobilized onto the sphere. Under reaction condition, compared with MCM-41 type catalyst which has the same pore structure, the sphere catalyst showed both higher activity and selectivity because of the fast diffusion of the reactants and pore structure.3 Functionalized SBA-15 was first gained by using P123 as the surfactant under acid condition. After grafting the proline onto the SBA-15, the catalyst highlighted compared activity to the homogeneous catalyst and could be reused for several times without great lose of the activity.