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Catalyst with CeZrK/rGO nano solid solution as main component

A solid solution and catalyst technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, machines/engines, etc., can solve the problem of high catalyst cost

Active Publication Date: 2021-03-19
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, the exhaust temperature of the diesel engine is between 150°C and 450°C. The temperature at which the soot oxidation in the above invention reaches the maximum rate is 416°C. Although it has fallen into the range of the exhaust temperature of the diesel engine, it is in a relatively high range, and the catalytic activity There is still room for improvement
Because it is a loaded alloy catalyst and the carrier is cerium-zirconium composite oxide and its light rare earth modification system, the alloy-type active component is a homogeneous palladium-silver alloy, resulting in a relatively high cost of the catalyst

Method used

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  • Catalyst with CeZrK/rGO nano solid solution as main component
  • Catalyst with CeZrK/rGO nano solid solution as main component
  • Catalyst with CeZrK/rGO nano solid solution as main component

Examples

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Embodiment 1

[0049] A kind of catalyst with CeZrK / rGO nanometer solid solution as main component, the active component of this catalyst is CeZrK / rGO nanometer solid solution, and described CeZrK / rGO nanometer solid solution catalyst has following general formula:

[0050] Ce A Zr B K C / rGO

[0051] In the general formula, A:B:C=5:1~3:1~3.

[0052] The CeZrK / rGO nanometer solid solution catalyst consists of cerium ions (Ce 4+ ), zirconium ions (Zr 4+ ) and potassium ions (K + ) of spherical metal oxide nanoparticles.

[0053] The reduced graphene oxide (rGO) has mesopore distribution characteristics, and the CeZrK / rGO nanometer solid solution catalyst has a nanopore structure (36.1-36.9nm).

[0054] The specific surface area of ​​the CeZrK / rGO nano solid solution catalyst is 117.2-152.4m 2 / g.

[0055] The crystallite size of the CeZrK / rGO nanometer solid solution catalyst is 6.7-8.3nm.

[0056] The average particle size of CeAZrBKC / rGO is smaller than that of CeZrOx catalyst (15...

Embodiment 2

[0077] Such as figure 2 As shown, the present embodiment describes the morphology and size of the CeZrK / rGO nanometer solid solution catalyst using transmission electron microscopy (TEM) technology. It can be seen that the base material of graphene takes the form of translucent flakes with wrinkles and folds. The metal oxide particles supported on graphene are uniform and highly dispersed. From figure 2 can be found in the TEM image, with Ce 5 Zr 1 K 1 / rGO and Ce 5 Zr 3 K 3 / rGO vs Ce 5 Z r2 k 2 / rGO has the most uniform dispersion of metal oxide particles. Ce can be obtained using nanometer measurement software 5 Zr 1 K 1 / rGO, Ce 5 Zr 2 K 2 / rGO and Ce 5 Zr 3 K 3 The average particle sizes of / rGO are 9.65nm, 7.42nm and 9.39nm, respectively, smaller than that of CeZrO x The average particle diameter of the catalyst is 15-20nm. This indicates that graphene inhibits the surface migration of metal oxide nanoparticles and reduces the size of metal oxide ...

Embodiment 3

[0081] This example uses N 2 The characteristics of CeZrK / rGO nano solid solution catalyst were analyzed by adsorption-desorption experiment. Figure 4 Shown is the N of the CeZrK / rGO nano-solid solution catalyst 2 Adsorption isotherm and pore size distribution line graph. Since adsorption and diffusion are key processes in heterogeneous catalytic reactions, the pore structure of CeZrK / rGO nano-solid solution catalysts has a great influence on its catalytic performance. In the IUPAC classification, the similar type IV isotherm with H3 type hysteresis loop indicates that the CeZrK / rGO nano-solid solution catalyst is characterized by mesoporous distribution. exist Figure 4 As can be seen from b, d and f of 5 Zr 1 K 1 / rGO, Ce 5 Zr 2 K 2 / rGO and Ce 5 Zr 3 K 3 The most likely pore diameters of / rGO are 36.9nm, 36.8nm, and 36.1nm, respectively, which are larger than soot (>20nm), which ensures that soot can enter the internal pores of the CeZrK / rGO nano-solid solution...

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Abstract

The invention provides a catalyst with a CeZrK / rGO nano solid solution as a main component. The active component of the catalyst is the CeZrK / rGO nano solid solution; wherein the CeZrK / rGO nano solidsolution is composed of spherical metal oxide nano particles of cerium ions (Ce4+), zirconium ions (Zr4+) and potassium ions (K+) which take graphene as a carrier. The catalyst provided by the invention has the characteristics of low reaction temperature, high catalytic activity, easy synthesis, low cost and good thermal stability, and can overcome the defects of catalysts in the prior art.

Description

technical field [0001] The invention specifically relates to a catalyst whose main component is CeZrK / rGO nanometer solid solution. [0002] technical background [0003] Diesel engines are widely used in transportation and various off-road construction machinery. However, the waste gas emitted by it will cause serious environmental pollution, and the carbon smoke emitted will have a great impact on the environment and human health due to insufficient combustion. Soot emission control technology of diesel engine has become the focus of governments and scholars in various countries. [0004] The exhaust temperature of a diesel engine is between 150°C and 450°C, while the oxidation temperature of soot exceeds 550°C. Therefore, in order to eliminate soot pollution, it is necessary to increase the exhaust temperature to intensify the soot oxidation reaction, but too high soot combustion temperature will damage the filter material. Therefore, a more feasible way is to use catal...

Claims

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Application Information

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IPC IPC(8): B01J23/10B01J35/10F01N3/28
CPCB01J23/10F01N3/2803B01J35/61
Inventor 李玉强吴钢
Owner CENT SOUTH UNIV
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