Honeycomb catalyst for purifying exhaust gas discharged from automobile, method for producing the same, and exhaust gas purifying method using the catalyst
A honeycomb structure, exhaust gas purification technology, applied in catalyst activation/preparation, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc. The effect of superior performance
Inactive Publication Date: 2011-06-01
N E CHEMCAT
View PDF8 Cites 12 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
It should be noted that zirconium is a transition metal and its oxide has oxygen storage and release capabilities, so zirconia can be considered as an OSC, however, it is said that zirconia is not expected to be as capable as an OSC than ceria
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1 and 2
[0181] (Examples 1 and 2), (Comparative Examples 1 to 3)
[0182] Purification performance of HC, CO and NOx on the honeycomb structure type catalyst obtained above was measured for T50 and purification rate under the following conditions. Example 1 and Example 2 of Table 1 (composition table) correspond to Examples 1 and 2, and Examples 3 to 5 correspond to Comparative Examples 1 to 3.
[0183] T50 refers to the temperature at which 50% conversion performance is obtained in the components purified by the catalyst, and is widely known by those skilled in the art as an index indicating the light-off temperature (performance). The light-off temperature is the temperature at which the purification ability of HC, CO and NOx in the catalyst starts to function. The fact that the light-off temperature is low indicates that the purification ability begins to develop at low temperature, and the performance as a catalyst is high; the high light-off temperature indicates that the purifi...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
| Property | Measurement | Unit |
|---|---|---|
| specific surface area | aaaaa | aaaaa |
| thickness | aaaaa | aaaaa |
Login to View More
Abstract
Disclosed is a catalyst for purifying exhaust gas, which is composed of a relatively low-cost three-way catalyst containing a noble metal component and suppressed in sintering of the noble metal even at high temperatures. The catalyst for purifying exhaust gas can remove carbon monoxide (CO), hydrocarbon (HC) and nitrogen oxides (NOx), and particularly excels in removal of nitrogen oxides. An exhaust gas purifying method is also disclosed. Specifically disclosed is a honeycomb catalyst wherein a carrier composed of a honeycomb structure is coated with two or more layers of a catalyst composition for removing carbon monoxide, hydrocarbon and nitrogen oxides contained in exhaust gas. The upper catalyst layer (A) contains palladium supported by a heat-resistant inorganic oxide, an oxygen absorbing / desorbing material, and a barium component. The lower catalyst layer (B) contains rhodium supported by a cerium-zirconium complex oxide having a cerium / zirconium weight ratio of 0.05-0.2 in terms of oxides.
Description
technical field [0001] The present invention relates to a honeycomb structure type catalyst for purifying exhaust gas emitted by automobiles, a preparation method thereof and a method for purifying exhaust gas using the catalyst, and a catalyst for purifying exhaust gas, a preparation method thereof and a method for purifying exhaust gas, the catalyst being A relatively inexpensive three-way catalyst containing noble metal components, which can suppress the sintering of noble metals even at high temperatures, and can purify carbon monoxide (CO), hydrocarbons (HC) and nitrogen oxides (NOx), especially for the purification of nitrogen oxides good. Background technique [0002] Generally, various components have been used as catalyst compositions corresponding to their purposes to purify exhaust gas emitted from internal combustion engines of automobiles and the like. Among them, the platinum group metal used as the main catalyst component is supported in a highly dispersed st...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/58B01D53/94B01J37/02F01N3/10F01N3/28
CPCB01D2255/908B01D2255/407B01J35/04B01D2255/2042B01J35/0006B01D2258/012B01J23/58B01D2255/91B01D2255/1023B01D2255/1025B01J23/63B01D53/945Y02T10/22B01D2255/9022B01J21/066B01J37/0248B01D2258/014B01D2255/9207F01N3/2803B01J37/038Y10T29/49345Y02A50/20Y02T10/12B01J35/19B01J35/56
Inventor 中山裕基远藤浩幸黑川贵弘
Owner N E CHEMCAT