Hokkaido University

Sumitomo Chemical Company, Limited

Ryu Abe

Bunsho Ohtani

Yoshiaki Sakatani

Makoto Murata

Hiroaki Nishimine

Miho Yamauchi

Osamu Tomita

Disclosed are: a catalyst which is capable of reducing and converting nitrate ions into ammonia without adding a hydrogen gas thereto; a method for synthesizing ammonia using the catalyst, wherein nitrate ions are reduced without adding a hydrogen gas thereto; and a method for decreasing nitrogen oxide in water by reducing nitrate ions contained in the water. Disclosed is a photocatalyst composition that is obtained by loading a photocatalyst, which is capable of photoreducing protons into a hydrogen gas, with CuPd alloy nanoparticles. The photocatalyst composition is used for the purpose of producing ammonia by photoreducing nitrogen that is coexistent with water and nitrogen oxide. The CuPd alloy nanoparticles are (1) CuPd alloy nanoparticles having a B2 type crystal structure and represented by CuxPd(1-x) (wherein 0.3&#x2266;x&#x2266;0.7), (2) CuPd alloy nanoparticles having a bcc type crystal structure and represented by CuxPd(1-x) (wherein 0.3&#x3c;x&#x3c;0.7), (3) CuPd alloy nanoparticles having a fcc type crystal structure and represented by CuxPd(1-x) (wherein 0.01&#x2266;x&#x2266;0.99), (4) CuPd alloy nanoparticles having an L12 type crystal structure and represented by CuxPd(1-x) (wherein 0.7&#x2266;x&#x2266;0.98), or (5) CuPd alloy nanoparticles having a crystal structure wherein at least two of a B2 type portion, a bcc type portion, an fcc type portion, an L12 type portion and a phase separation type portion are mixed. Disclosed are a method for synthesizing ammonia using the photocatalyst composition, and a method for decreasing nitrogen oxide in water using the photocatalyst composition.

Photoreduction catalyst, and method for synthesizing ammonia and method for decreasing nitrogen oxides in water using the same

To provide a tungsten oxide photocatalyst which shows a high photocatalytic activity by irradiating with visible light even under the environment where ultraviolet light is not irradiated, the tungsten oxide photocatalyst has tungsten oxide particles and Pt particles having a primary particle size of 3 to 20 nm supported on the surface of the tungsten oxide particles in an amount of 0.03 to 5 parts by weight based on 100 parts by weight of the tungsten oxide particles.

Tungsten oxide photocatalyst comprising platinum particles

According to the present invention, two hydroxyl groups can be introduced into the 1-position and the 4-position of the benzene ring of an aromatic compound highly efficiently and highly selectively by a one step process to give the corresponding aromatic hydroxide. The present invention provides a production method of an aromatic hydroxide represented by the formula (2) wherein R, R, R, and, Rare each independently a hydrogen atom or an alkyl group having a carbon atom number of 1-20, and R, Rand/or Rand Rare optionally bonded to each other to form a ring, which comprises irradiating light to a photoelectrode comprised of metal oxide while applying a given potential in the presence of an aromatic compound represented by the formula (1) wherein R, R, R, and Rare as defined above.

Production method of aromatic hydroxide

Growing community of inventors

Sapporo, Japan

Ryu Abe