发明名称 |
Highly hydrothermal-resistant SCR catalyst and manufacturing method therefor |
摘要 |
An SCR catalyst including iron-containing β-type zeolite has high NOx reducing performance at a high temperature in the presence of a reducing agent, but does not have the sufficient reducing performance at a low temperature (not higher than 200° C.). A high NOx reduction rate of at least 45% at a temperature not higher than 200° C. is achieved by an SCR catalyst containing iron-containing β-type zeolite having a full width at half maximum (FWHM) on the X-ray crystal diffraction (302) plane of from 0.28 to 0.34° and a weight loss on heating to 900° C. after hydration treatment of from 15.0 to 18.0% by weight. The SCR catalyst can be manufactured by calcining iron-containing β-type zeolite at 700 to 850° C. under an atmosphere of a water vapor concentration of not more than 5% by volume. |
申请公布号 |
US9138685(B2) |
申请公布日期 |
2015.09.22 |
申请号 |
US201013389975 |
申请日期 |
2010.08.25 |
申请人 |
TOSOH CORPORATION |
发明人 |
Tokunaga Keisuke |
分类号 |
B01J29/06;B01D53/94;B01J29/072;B01J29/76;B01J35/00;B01J35/02;B01J35/04;B01J37/02;B01J37/08;B01J37/10;B01J37/30;F01N3/20 |
主分类号 |
B01J29/06 |
代理机构 |
Greenblum & Bernstein, P.L.C. |
代理人 |
Greenblum & Bernstein, P.L.C. |
主权项 |
1. An SCR catalyst comprising iron-containing β-type zeolite having a full width at half maximum (FWHM) on the X-ray crystal diffraction (302) plane of from 0.28 to 0.34° and a weight loss on heating to 900 ° C. after standing for 12 hours or more in a desiccator which has a saturated aqueous solution of ammonium chloride filled in a lower part thereof and has an internal pressure of not more than 15 Torr of from 15.0to 18.0% by weight. |
地址 |
Yamaguchi JP |