Simple post-treatments of the porous titania monolith in varied concentrations of phosphoric acid solution provide a series of monolithic titanium phosphates(TiPs)with a hierarchically porous structure together with a...Simple post-treatments of the porous titania monolith in varied concentrations of phosphoric acid solution provide a series of monolithic titanium phosphates(TiPs)with a hierarchically porous structure together with an exquisite macropore surface.Depending on the reaction conditions,platy crystallites composed of either Ti_(2)O_(3)(H_(2)PO_(4))_(2)·2H_(2)O,Ti(HPO_(4))_(2)·H_(2)O(α-TiP),or Ti_(2)O(PO_(4))_(2)·2H_(2)O(π-TiP)are generated on the macropore skeleton via a dissolution and reprecipitation process,which forms distinct wrinkled surface morphologies.In addition,the treatments effectively suppress the shrinkage during drying,leading to lower bulk density.Post-calcination in air yields porous titanium pyrophosphates preserving the intricate porous architecture in some cases.Notably,the hierarchically porous TiP2O7 monoliths prepared from theα-TiP precursors have a good thermal robustness related to bulk density.展开更多
基金supported by the Advanced Low Carbon Technology Research and Development Program(ALCA,JST Japan)Japan Society for the Promotion of Science(JSPS)KAKENHI Grant Numbers JP26288106,16K05935 and 15J00156.
文摘Simple post-treatments of the porous titania monolith in varied concentrations of phosphoric acid solution provide a series of monolithic titanium phosphates(TiPs)with a hierarchically porous structure together with an exquisite macropore surface.Depending on the reaction conditions,platy crystallites composed of either Ti_(2)O_(3)(H_(2)PO_(4))_(2)·2H_(2)O,Ti(HPO_(4))_(2)·H_(2)O(α-TiP),or Ti_(2)O(PO_(4))_(2)·2H_(2)O(π-TiP)are generated on the macropore skeleton via a dissolution and reprecipitation process,which forms distinct wrinkled surface morphologies.In addition,the treatments effectively suppress the shrinkage during drying,leading to lower bulk density.Post-calcination in air yields porous titanium pyrophosphates preserving the intricate porous architecture in some cases.Notably,the hierarchically porous TiP2O7 monoliths prepared from theα-TiP precursors have a good thermal robustness related to bulk density.
