Synthesis Of Porous Materials And Application On Hydrogen Stoarge Of Ammonia Borane

Porous materials have attracted the extensive attention due to its unique porestructure and separation, catalysis, adsorption, confinement properties. Especially, inrecent years, following the development of COFs, MOFs, PAFs materials, organicfunctional groups are introduced into the frameworks which provides widerdevelopment space to design and synthesis porous materials from inorganic moleculesieves to the organic porous material with practical applications.This paper mainly focuses on how to build up the porous framework which hasthe specific topology of molecule sieve using the organic-inorganic hybrid buildingunit. And we also discussed nano-confinement and catalytic performances of PAFs,MOFs on hydrogen storage in AB system. A series of techniques were employed toimprove the total hydrogen storage and hydrogen dynamics. In summery, the workhas achieved the following results:(1). Using silica double4-rings (D4R) functionalized cubic silane I8OPS[(IPhSiO3/2)8](octaphenylsilsesquioxanes, OPSs) as cubic nano building block,biphenyl groups were formed to alternate the T–O–T linkage between D4R in LTA orACO backbones of the new porous organic-inorganic hybrid framework of JUC-Z1.MAS, NMR and N2adsorption results show that the structure is likely to have LTAtopology. This strategy of utilizing I8OPS as a building block with Ullmann chemistryas a linking method may provide an approach for constructing a wide variety offunctionalized zeolitic porous organic frameworks that bridge COFs and zeolites.(2). Using porous aromatic framework PAF-1as substrate to nano-confine ABmolecules can improve the amount of hydrogen and decrease the release temperaturewith no volatile by-products in dehydrogenation process. It started to dehydrogenateat very low temperature (around50oC) with the peak of77oC. Furthermore, about4wt%(AB) of hydrogen was evolved in the first25minutes at75oC which is2wt%ofsystem. Compared with other porous supports such as MOFs, the PAF-1has a verylow framework density because it is built up by light C and H elements. This couldsignificantly improve the hydrogen systemic gravimetric capacity and thus more feasible in practical applications.(3). MOFs has good catalytic effect due to the metals in the structure relative tothe aromatic frameworks of PAFs materials in the thermal decomposition of AB. Weused NiCo-MOF-74as bi-metal catalyst and nano-confinement substrate. The amountof released hydrogen and rate were much higher than that of the single metalNi-MOF-74and Co-MOF-74systems. Studies have found that Ni is better catalyst toimprove hydrogen releasing speed, and Co is easier to keep the structural stability ofMOF-74. It provides a new method to selective utilize nano-confinement and catalyticproperties.