CATALYST MATERIAL PRODUCTION PROCESS AND CATALYST MATERIAL AS WELL AS EXHAUST GAS PURIFICATION CATALYST CONTAINING SAID CATALYST MATERIAL

• Main Authors: MATSUMURA MASUHIRO, KAWABATA HISAYA, SHIGETSU MASAHIKO
• Format: Patent
• Language: English; Japanese
• Published: 09.03.2017
• Subjects: BLASTING; CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; ENGINE PLANTS IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNALCOMBUSTION ENGINES; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES ORENGINES IN GENERAL; HEATING; LIGHTING; MACHINES OR ENGINES IN GENERAL; MECHANICAL ENGINEERING; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; STEAM ENGINES; THEIR RELEVANT APPARATUS; TRANSPORTING; WEAPONS

PROBLEM TO BE SOLVED: To provide a catalyst production process and catalyst for enhancing the contact property of catalyst metal with exhaust gas and for improving the catalytic performance of catalyst material by having the catalyst metal supported as much as possible not only within the pores of the support material but also over the whole surface.SOLUTION: Provided is a catalyst material production process in which first a solution containing a salt of a catalyst metal 5 and a dispersion liquid in which a carbon particle 4 having a porosity of 50% or more is dispersed are mixed to prepare a mixture, then it is supported on an inorganic oxide particle 3, followed by calcination in an Ar atmosphere. Said catalyst material production process in which the average primary particle size of the carbon particle is 30 to 50 nm, and the ratio of the mass of the catalyst metal to the mass of the carbon particle is 1/10≤[catalyst metal/carbon particle]≤1/2. Provided is a catalyst material produced by said process in which the catalyst metal is Pt, the crystal diameter of Pt after the calcination at 600°C for 2 hours in a non-oxidizing atmosphere is 30 to 50 nm; when the catalyst metal is Pd, it is 40 to 50 nm; and in the case of Rh, it is 5 to 20 nm.SELECTED DRAWING: Figure 1 【課題】サポート材の細孔内のみならず表面全体になるべく多くの触媒金属を担持させることにより、触媒金属の排気ガスとの接触性を高め、触媒材の触媒性能を向上させるための、触媒の製造方法及び触媒を提供。【解決手段】触媒金属５の塩を含む溶液と、５０％以上の空隙率を有するカーボン粒子４を分散させた分散液とを混合して混合液を調製してから、これを無機酸化物粒子３に担持させた後に、Ａｒ雰囲気中で焼成するようにした触媒材の製造方法。前記カーボン粒子の平均一次粒子径が３０〜５０ｎｍであり、カーボン粒子の質量に対する前記触媒金属の質量の割合は１／１０≦［触媒金属／カーボン粒子］１／２である触媒材の製造方法。前記触媒金属はＰｔであり、非酸化性雰囲気中６００℃で２時間の焼成を行った後のＰｔの結晶径が３０〜５０ｎｍであり、前記触媒金属がＰｄの場合、４０〜５０ｎｍであり、Ｒｈの場合、５〜２０ｎｍである触媒材。【選択図】図１