Mixed metal oxide formaldehyde decomposition catalyst filter and manufacturing method thereof
A mixed metal and oxide technology, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as outdoor air pollution and high installation costs
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Embodiment 1
[0066] Example 1: MnO used to form a load X -CeO 2 -Ag 2 One-step method for O catalyst filters
[0067] In Example 1, the MnO X -CeO 2 -Ag 2 The O catalyst is formed substantially within the pores of the channel walls of the honeycomb support. Specifically, 22.84 g of manganese (II) nitrate tetrahydrate, 39.52 g of cerium (III) nitrate hexahydrate, and 3.09 g of silver nitrate were dissolved in 100 ml of DI water to form a mixed metal salt solution. A cordierite honeycomb support (1.0" diameter x 4.0" length) with 65% porosity was immersed in the mixed metal salt solution for approximately one minute. After cleaning the channels of the carrier, the samples were dried in an inline oven at 130°C. Finally, the samples were heated at 400 °C for 2 h in an inline furnace to form mixed metal oxide particles in the channels and pores of the support.
[0068] In a fixed bed reactor, the catalytic activity (ie, formaldehyde removal efficiency) test of the supported catalyst of ...
Embodiment 2
[0069] Example 2: MnO used to form a load X -CeO 2 -Ag 2 Two-step in situ method for O catalyst filters.
[0070] In Example 2, a two-step in situ method was used to convert Ag-containing MnO X -CeO 2 The catalyst coating was formed substantially within the pores of the channel walls of a cordierite honeycomb support (1.0" diameter x 4.0" length) with 65% porosity. In a first step, 25.81 g of manganese (II) nitrate tetrahydrate, 49.12 g of cerium (III) nitrate hexahydrate were dissolved in 100 ml of DI water to form a mixed metal salt solution. The honeycomb support is immersed in a mixed metal salt solution so that the solution fills the pores of the channel walls. Drying and thermal decomposition were performed in the same manner as in Example 1 to form MnO in the pores of the channel walls of the carrier X -CeO 2 Catalyst coating.
[0071] In the second step, the coated MnO X -CeO 2 The catalyst support was impregnated with 2.17 wt% AgNO 3 solution so that the so...
Embodiment 3
[0072] Example 3: Effect of carrier porosity on formaldehyde removal performance of supported catalyst filter
[0073] In Example 3, the effect of the porosity of the honeycomb support on the formaldehyde removal performance of the supported mixed metal oxide catalyst was determined by applying almost the same amount of catalyst to honeycomb supports with different porosities. The catalyst loading process of each carrier is the same as in Example 2. Supports include high porosity filter (HPF) substrates, thin-walled filter (TWF) substrates, asymmetric cell filter (ACT) substrates, and honeycomb filter (HC) substrates. The properties of these carriers are shown in Table 1 below.
[0074] Table 1
[0075]
[0076] Figure 7A and 7B is a graph showing the formaldehyde removal ability of the mixed metal oxide catalyst supported on the honeycomb support having the porosity stated in Table 1. The formaldehyde removal ability of the supported catalyst was measured in the same...
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