成果報告書詳細
管理番号20160000000617
タイトル*平成26年度中間年報 「二酸化炭素原料化基幹化学品製造プロセス技術開発」
公開日2016/7/22
報告書年度2014 - 2014
委託先名人工光合成化学プロセス技術研究組合
プロジェクト番号P14002
部署名環境部
和文要約
英文要約The purpose of the project is to develop innovative technologies to produce basic chemical substances, such as raw materials of plastics, from water and carbon dioxide using the solar energy.
(1) Research and development of photocatalysts, cocatalysts, and modules using these materials for water splitting
(i) Extension of the absorption edge wavelength and reduction of defects in photocatalysts
Many kinds of semiconductors with absorption edge wavelengths of 600-700 nm were researched in terms of the composition and synthesis method. We found some high-performance photocatalysts for hydrogen generation and oxygen generation. We also researched ammonothermal and flux methods to reduce densities of defects in photocatalysts.
(ii) Design of the interface between photocatalysts and cocatalysts
Nanoparticle cocatalysts and metal complex co-catalysts were researched in order to use the solar energy effectively for water splitting. Processes to form an ideal interface between photocatalysts and cocatalysts were studied. The water splitting activity was improved by these studies.
We achieved the FY2014 target for the energy-conversion efficiency of photocatalysts (1%) by combination of the technologies written above.
(2) Research and development of hydrogen separation membranes and modules
(i) Thin porous membranes and modules for separation of hydrogen and oxygen
Three kinds of materials (zeolite, silica, and carbon) were researched in terms of their compositions and structures for hydrogen separation. We achieved the FY2014 informal targets of the permeability and gas selectivity.
(ii) Design of modules that allows for safe separation of hydrogen
The diluent gas system that dilutes hydrogen below the explosion limit by the inert gas have been proposed for safe separation of hydrogen from a gaseous mixture of hydrogen and oxygen produced by the water-splitting reaction using photocatalysts.
(3) Development of technologies for converting carbon dioxide into lower olefins
(i) Research and development of catalysts for synthesis of lower olefins
Three types of synthetic process were developed.
a) FT process directly producing lower olefins in high yields
Improvements of Fe-based catalyst were sought in order to directly manufacture lower olefins from syngas by the Fischer-Tropsch process. The effects of co-catalysts, conditions for preparing catalysts, and reaction conditions such as pressure, temperature and the kind of solvents were studied to enhance the lower olefins yield.
b) FT/cracking combined process
We tried to decrease the selectivity for CO2 as by-product and simultaneously to increase the selectivity for light olefins in the FT reaction. We found that addition of CO2 to syngas resulted in a decrease in the CO2 formation. For the cracking of olefin-rich FT products, novel methods of metal modification of zeolite catalysts led to the increase in the lower olefins selectivity.
c) Methanol synthesis/MTO (Methanol to Olefin) combined process
We tried to improve membrane-sealing technology to be used in MeOH synthesis membrane reactors. For the MTO reaction, optimization of zeolite structure and composition and reaction conditions successfully suppressed the formation of by-products. From these findings described above, we have achieved the interim (2014FY) goal of 70% in the lower olefins yield.
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