Catalyst for purifying exhaust gas
一种排气净化、催化剂的技术，应用在排气净化用催化剂领域，能够解决贵金属浪费、对NOx净化性能不充分等问题，达到净化性能提高、成本的增大抑制的效果
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Embodiment 1
[0044] figure 1 A schematic cross-sectional view showing the exhaust gas purification catalyst of this embodiment. This exhaust gas purification catalyst includes a cordierite honeycomb substrate 1 (130 mm in length), an upstream coating 2 formed in a range of 65 mm from the upstream end face of the honeycomb substrate 1, and a The downstream-side coating layer 3 is formed in a range of 65 mm from the downstream-side end surface. On the upstream coating layer 2 and the downstream coating layer 3, Pt and Ph are loaded at different loading densities, respectively. A method for producing the exhaust gas purification catalyst will be described below instead of a detailed description of the configuration.
[0045] Use the specified concentration of dinitrodiamine platinum solution to adsorb and load on CeO 2 -ZrO 2 Solid solution powder (by weight, CeO 2 :ZrO 2 =60:40), dried at 120°C and fired at 500°C for 2 hours to prepare Pt / CeO loaded with 1.6% by weight of Pt 2 -ZrO 2...
Embodiment 2～5、 comparative example 1～10
[0054] Using the same CeO as in Example 1 2 -ZrO 2 The same catalyst powder as in Example 1 was prepared except that Pt or Rh was loaded on the solid solution powder, and the loading amount was different. Then, a coating layer was formed on the same honeycomb substrate as in Example 1, and catalysts having different supported amounts and supported distributions of Pt and Rh as shown in Table 1 were prepared. In any case, 1.5 g / L of Pt and 0.4 g / L of Rh were supported on the entire catalyst.
[0055] (conventional example)
[0056] Using the same CeO as in Example 1 2 -ZrO 2 The same catalyst powder as in Example 1 was prepared except that Pt or Rh was loaded on the solid solution powder, and the loading amount was different. Then, a coating layer was formed on the same honeycomb substrate as in Example 1, and as shown in Table 1, 1.5 g / L of Pt was uniformly loaded as a whole, and Pt was uniformly loaded as a whole as shown in Table 1. 0.4g / L Rh catalyst.
Embodiment 6
[0057] (Example 6, Comparative Examples 11-18)
[0058] Using the same CeO as in Example 1 2 -ZrO 2 The same catalyst powder as in Example 1 was prepared except that Pt or Rh was loaded on the solid solution powder, and the loading amount was different. Then, form the upstream side coating layer 2 in the range of 30 mm from the upstream side end surface of the same honeycomb substrate as in Example 1, and form the downstream side coating layer in the remaining 100 mm range, in the same manner as in Example 1 Coatings were formed in such a way that catalysts with different supported amounts and supported distributions of Pt and Rh as shown in Table 2 were prepared. In either case, 1.5 g / L of Pt and 0.4 g / L of Rh were supported on the entire catalyst, respectively.
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