Tosoh Corporation

Yukio Ito

Yasushi Hara

Masao Nakano

Kazuhiko Sekizawa

Keiji Itabashi

Hiroshi Ogawa

Nobumasa Suzuki

Takanori Miyake

Toshio Hironaka

Satoshi Yoshida

Yasuyuki Takamitsu

Noritaka Nagasaki

Hidenori Yamada

Nobuyuki Kanai

[Problem] The purpose of the present invention is to provide: a pentasil-type zeolite that combines a higher BET specific surface area and a higher acid amount than previously; and a method for manufacturing said pentasil-type zeolite. [Solution] A pentasil-type zeolite characterized in that the BET specific surface area thereof is 450 m/g or more, and furthermore the acid amount thereof, measured by the ammonia-TPD method, is 0.38 mmol/g or more. This pentasil-type zeolite can be obtained by a manufacturing method which has a crystallization step for crystallizing a mixture containing tetrabutylphosphonium cations, a silica source, an alumina source, an alkali metal source, and water, and which is characterized in that the molar ratio of the alkali metal relative to the silica in the mixture is greater than 0.04 and less than 0.10.

Pentasil-type zeolite, and method for manufacturing same

A subject for the invention is to provide a highly heat-resistant SCR catalyst which has an NOx reduction percentage of 40% or higher at 200&#xb0; C. after a hydrothermal durability treatment. The invention relates to use of &#x3b2;-type zeolite which has an SiO/AlOmolar ratio of 20 or higher but less than 30 and a crystallite diameter before a hydrothermal durability treatment of 20 nm or larger, shows a change in crystallite through the hydrothermal durability treatment of less than 10%, and has a fluorine content lower than 0.1%. The &#x3b2;-type zeolite can be crystallized from a liquid reaction mixture containing a secondary and/or a tertiary alkylamine having 5 or more carbon atoms.

Highly heat-resistant &#x3b2;-type zeolite and SCR catalyst employing the same

A method for adsorbing and removing ethylene in an exhaust gas, comprises contacting with the gas an adsorbent comprising a zeolite which contains Ag and which has a ferrierite structure with a SiO,/Al,O,molar ratio being at least 15.

Method for adsorbing and removing ethylene and method for purifying an exhaust gas

A method for purifying an exhaust gas by contacting the exhaust gas with an exhaust gas-purifying catalyst comprising a nitrogen oxide-removing catalyst and an adsorbent for ethylene comprising a zeolite which contains Ag, and also Pd, optionally which has a ferrierite structure.

Adsorbent for ethylene, method for adsorbing and removing ethylene and

An adsorbent for ethylene, comprising a zeolite which contains Ag and which has a ferrierite structure with a SiO.sub.2 /Al.sub.2 O.sub.3 molar ratio being at least 15.

A process for producing an ethylenamine, which comprises reacting ammonia and/or an ethylenamine with an ethanolamine in the presence of hydrogen to obtain an ethylenamine having an increased number of ethylene chains over the ammonia and/or the ethyelenamine used as the starting material, wherein a catalyst comprising Ni and M elements wherein M is at least one rare earth element selected from the group consisting of scandium, yttrium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and lutetium, is used for the reaction.

Process for producing an ethylenamine

A process for producing an alkylenamine, which comprises reacting ammonia and/or an alkylenamine with an alkanolamine in the presence of niobium oxide treated with an acid, to obtain an alkylenamine having an increased number of alkylene chains over the ammonia and/or the alkylenamine as starting material.

Process for producing alkylenamine

A process for producing an alkylenamine, which comprises reacting ammonia and/or a polyalkylene polyamine with an alkanolamine to obtain an alkylenamine having an increased number of alkylene chains over the ammonia and/or the alkylenamine as starting material, wherein a catalyst having a niobium-containing substance supported on a carrier is used for the reaction.

Process for producing a polyalkylene polyamine

A mixed oxide catalyst comprising niobium oxide and a member selected from the group consisting of titania, alumina, silica, zirconia and oxides of elements in Groups IIA, VA, VIA, IB, IIB, IIIB, VB, VIB, VIIB and VIII of the Periodic Table. A process for producing an alkylenamine, which comprise reacting ammonia and/or an alkylenamine with an alkanolamine in the presence of such a mixed oxide.

Growing community of inventors

Kudamatsu, Japan

Yukio Ito