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IRON-BASED COMPOSITE OXIDE CATALYST FOR EXHAUST GAS PURIFICATION AND METHOD FOR PRODUCING SAME

Foreign code F180009612
File No. 5516
Posted date Nov 19, 2018
Country WIPO
International application number 2017JP036679
International publication number WO 2018070381
Date of international filing Oct 10, 2017
Date of international publication Apr 19, 2018
Priority data
  • P2016-202201 (Oct 14, 2016) JP
Title IRON-BASED COMPOSITE OXIDE CATALYST FOR EXHAUST GAS PURIFICATION AND METHOD FOR PRODUCING SAME
Abstract The present invention provides an iron-based composite oxide catalyst for exhaust gas purification, which is represented by formula (I). M/M1xOy/FeNbO4 (I) (In the formula, M, M1, x and y are as defined in the description.)
Outline of related art and contending technology BACKGROUND ART
In the automotive exhaust gas purification, a noble metal Pt, Rh, Pd and the main catalyst containing oxygen storage material is CeO2 -based composite oxide has been required of the co-catalyst (Non-Patent Document 1 and 2).The role of the main catalyst contained in the CO in the exhaust gas, NO, and the residue hydrocarbon fuel (HC) of harmful substances such as CO2, H2 O,N2 is to purify.That is, the exhaust gas, HC and CO oxidation reaction caused by the combustion of the N and the NO2 is converted into a necessary reduction reaction to proceed simultaneously.Therefore, depending on the concentration of oxygen in exhaust, the purification efficiency of the hazardous material will vary greatly.Among them, in order to efficiently purify harmful substances, and complete combustion of the fuel, and, oxygen does not remain in the vicinity of the stoichiometric air-fuel ratio (Theoretical Air Fuel ratio: A/F=14.6) are desired to be (non-patent document 3).This is because, under the conditions of the air-fuel ratio (A/F 14.6<) is, under reducing conditions and the atmosphere of the exhaust gas, HC and CO cannot be completely cleaned.On the other hand, the air-fuel ratio in a condition of a large (A/F 14.6>), an oxidizing atmosphere of NO and becomes difficult to purify.On the basis of such a background, an excess oxygen atmosphere (under a lean atmosphere) a high catalytic activity in the development of reducing NO, from the viewpoint of improvement of fuel consumption is a very important problem.
Scope of claims (In Japanese)請求の範囲 [請求項1]
下記式(I)
 M/M 1 xO y/FeNbO 4   (I)
(式中、MはPd、Rh及びPtからなる群から選ばれる少なくとも1種の貴金属を示す。M 1は、MnもしくはFeを示す。xは1~3の整数を示し、yは2~4の整数を示す。xが1のときはyが2であり,xが2のときはyが3であり,xが3のときはyが4である。M 1 xO yの質量はFeNbO 4の質量の0~50%である。Mは、M 1 xO y/FeNbO 4に担持されている。)
で表わされる、排ガス浄化用鉄系複合酸化物触媒。

[請求項2]
MがRhである、請求項1に記載の排ガス浄化用鉄系複合酸化物触媒。

[請求項3]
M 1 xO yがFe 2O 3である、請求項1又は2に記載の排ガス浄化用鉄系複合酸化物触媒。

[請求項4]
Fe 2O 3の質量はFeNbO 4の質量の15~25%である、請求項3に記載の排ガス浄化用鉄系複合酸化物触媒。

[請求項5]
M 1 xO y/FeNbO 4(M 1は、MnもしくはFeを示す。xは1~3の整数を示し、yは2~4の整数を示す。xが1のときはyが2であり,xが2のときはyが3であり,xが3のときはyが4である。M 1 xO yの質量はFeNbO 4の質量の0~50%である。)で表わされる複合酸化物担体をPd化合物、Pt化合物及びRh化合物の少なくとも1種を含む溶液に接触し、焼成する工程
を含む、下記式(I)
 M/M 1 xO y/FeNbO 4   (I)
(式中、MはPd、Rh及びPtからなる群から選ばれる少なくとも1種の貴金属を示す。M 1 xO yは前記に定義されるとおりである。M 1 xO yの質量はFeNbO 4の質量の0~50%である。Mは、Fe 2O 3/FeNbO 4に担持されている。)
で表わされる、排ガス浄化用鉄系複合酸化物触媒の製造方法。

  • Applicant
  • ※All designated countries except for US in the data before July 2012
  • KYOTO UNIVERSITY
  • Inventor
  • TANAKA, Tsunehiro
  • HOSOKAWA, Saburo
  • TERAMURA, Kentaro
IPC(International Patent Classification)
Specified countries National States: AE AG AL AM AO AT AU AZ BA BB BG BH BN BR BW BY BZ CA CH CL CN CO CR CU CZ DE DJ DK DM DO DZ EC EE EG ES FI GB GD GE GH GM GT HN HR HU ID IL IN IR IS JO KE KG KH KN KP KR KW KZ LA LC LK LR LS LU LY MA MD ME MG MK MN MW MX MY MZ NA NG NI NO NZ OM PA PE PG PH PL PT QA RO RS RU RW SA SC SD SE SG SK SL SM ST SV SY TH TJ TM TN TR TT TZ UA UG US UZ VC VN ZA ZM ZW
ARIPO: BW GH GM KE LR LS MW MZ NA RW SD SL SZ TZ UG ZM ZW
EAPO: AM AZ BY KG KZ RU TJ TM
EPO: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
OAPI: BF BJ CF CG CI CM GA GN GQ GW KM ML MR NE SN ST TD TG
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