ADSORBENT FOR HYDROCARBON AND CATALYST FOR EXHAUST GAS PURIFICATION

Title:

ADSORBENT FOR HYDROCARBON AND CATALYST FOR EXHAUST GAS PURIFICATION

Document Type and Number:

WIPO Patent Application WO/2000/024507

Kind Code:

A1

Abstract:

An adsorbent for hydrocarbon (HC) comprising a zeolite which contains none of monovalent metal elements and has an SiO¿2?/Al¿2?O¿3? molar ratio of 100 or higher and an average primary particle size of 1 $g(m)m or less. The adsorbent exhibits high adsorptivity for HC even after a durability test due to the absence of a monovalent metal element such as Na and, due to its small average primary particle size, have a large surface area for adsorbing HC and thus shows an increased amount of HC adsorbed relative to its weight. An adsorbent for HC comprising a first zeolite which comprises at least one of ZSM-5 and ferrierite and has an SiO¿2?/Al¿2?O¿3? molar ratio of 100 or lower, and carries at least one of Ag and Pd thereon, and a second zeolite which comprises Y type zeolite having an SiO¿2?/Al¿2?O¿3? molar ratio of 200 or higher is also disclosed. This adsorbent can efficiently adsorb both lower and higher HC. A catalyst for exhaust gas purification prepared by combining the above-mentioned adsorbent and an oxidizing catalyst exhibits a high percentage of purification with respect to HC in an exhaust gas.

Inventors:

ISHIKAWA NORIO (JP)
KANAZAWA TAKAAKI (JP)

Application Number:

PCT/JP1999/005925

Publication Date:

May 04, 2000

Filing Date:

October 26, 1999

Export Citation:

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Assignee:

TOYOTA MOTOR CO LTD (JP)
ISHIKAWA NORIO (JP)
KANAZAWA TAKAAKI (JP)

International Classes:

B01D53/04; B01D53/86; B01D53/94; B01J20/18; B01J29/068; B01J29/08; B01J29/12; B01J29/44; B01J29/80; B01J37/02; B01J29/40; F01N3/08; (IPC1-7): B01J20/18; B01J29/44; B01J29/80

Foreign References:

JPH06198164A	1994-07-19
JPH07213910A	1995-08-15
JPH0912540A	1997-01-14
JPS6136116A	1986-02-20
JPH07144128A	1995-06-06
JPS53125299A	1978-11-01
EP0304852A2	1989-03-01
JPH11228128A	1999-08-24
JPH11192427A	1999-07-21

Other References: