Formula and manufacturing method of acid and alkali resistant automobile three-way catalytic converter

A three-way catalyst, acid and alkali resistance technology, applied in chemical instruments and methods, catalyst carriers, physical/chemical process catalysts, etc., can solve the problems of strong acid and alkali intolerance, low carrier porosity, and poor catalytic ability. , to achieve the effect of stable adsorption performance, uniform pore distribution and high porosity

Inactive Publication Date: 2016-03-16
SUZHOU LIANCHI ENVIRONMENTAL SCI & TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pore-forming agent of the current carrier is generally an organic pore-forming agent, such as natural fibers, high molecular polymers and organic acids, etc. The organic pore-forming agent decomposes at a temperature much lower than the sintering temperature of the carrier, and leaves pores after decomposition. These pores, Especially some small pores are easy to be closed during the subsequent high-temperature sintering molding, resulting in low porosity of the carrier and poor catalytic ability
[0004] In addition, the adsorbent in the current catalyst generally uses alumina, which can adsorb small molecular polar compounds, such as CO, HC and NOx, and after the adsorption, the catalyst will convert CO, HC and NOx into harmless carbon dioxide and water. and nitrogen; but alumina is not resistant to strong acid and strong alkali, and is prone to aging and failure in strong acid and strong alkali environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] An acid and alkali resistant three-way catalytic converter formula for automobiles, characterized in that: it includes: 80wt% porous ceramics, 10wt% adsorbent and 10wt% catalyst; the porous ceramics includes the following raw materials in parts by weight: aluminum sol 90 parts, micro-nano α-Al 2 o 3 40 parts, 20 parts of pore-forming agent, 0 part of binding agent, 2 parts of binding agent and pH are 250 parts of acid solution of 3; Described pore-forming agent is inorganic salt; Described binding agent comprises calcium sulfate; Said The adsorbent includes silica gel; the catalyst includes noble metal oxides and rare earth oxides.

[0034] The binder includes polyvinyl alcohol.

[0035] The pore-forming agent includes one or more of sodium sulfate, calcium sulfate, sodium chloride, and calcium chloride.

[0036] The noble metal oxides include Pt oxides, Pd oxides and Rh oxides.

[0037] The rare earth oxides include lanthanum La, cerium Ce, praseodymium Pr, neodymi...

Embodiment 2

[0055] An acid and alkali resistant three-way catalytic converter formula for automobiles, characterized in that: it includes: 90wt% porous ceramics, 5wt% adsorbent and 5wt% catalyst; the porous ceramics includes the following raw materials in parts by weight: aluminum sol 100 parts, micro-nano α-Al 2 o 3 60 parts, 30 parts of pore-forming agent, 5 parts of binding agent, 5 parts of binding agent and pH are 350 parts of acid solution of 4; Described pore-forming agent is inorganic salt; Described binding agent comprises calcium sulfate; Said The adsorbent includes silica gel; the catalyst includes noble metal oxides and rare earth oxides.

[0056] The binder includes polyvinyl alcohol.

[0057] The pore-forming agent includes one or more of sodium sulfate, calcium sulfate, sodium chloride, and calcium chloride.

[0058] The noble metal oxides include Pt oxides, Pd oxides and Rh oxides.

[0059] The rare earth oxides include lanthanum La, cerium Ce, praseodymium Pr, neodymi...

Embodiment 3

[0077] An acid and alkali resistant three-way catalytic converter formula for automobiles, characterized in that: it includes: 85wt% porous ceramics, 5wt% adsorbent and 10wt% catalyst; the porous ceramics includes the following raw materials in parts by weight: aluminum sol 95 parts, micro-nano α-Al 2 o 3 50 parts, 25 parts of pore-forming agents, 2 parts of binders, 3 parts of binders and 3 parts of acid solutions with a pH of 3; the pore-forming agents are inorganic salts; the binders include calcium sulfate; the The adsorbent includes silica gel; the catalyst includes noble metal oxides and rare earth oxides.

[0078] The binder includes polyvinyl alcohol.

[0079] The pore-forming agent includes one or more of sodium sulfate, calcium sulfate, sodium chloride, and calcium chloride.

[0080] The noble metal oxides include Pt oxides, Pd oxides and Rh oxides.

[0081] The rare earth oxides include lanthanum La, cerium Ce, praseodymium Pr, neodymium Nd, promethium Pm, samar...

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PUM

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Abstract

The invention discloses a formula and manufacturing method of an acid and alkali resistant automobile three-way catalytic converter. The formula is characterized in that the formula involves 80-90wt% of porous ceramic, 5-10wt% of an adsorbent and 5-10wt% of a catalyst; the porous ceramic comprises, by weight, 90-100 parts of alumina sol, 40-60 parts of micro-nano-scale alpha-Al2O3, 20-30 parts of a pore-forming agent, 0-5 parts of a binder, 2-5 parts of an adhesive and 250-350 parts of an acid solution with the pH value being 3-4; the adsorbent comprises silica gel. According to the formula and manufacturing method of the acid and alkali resistant automobile three-way catalytic converter, the silica gel is used for replacing traditional aluminum oxide to serve as the adsorbent, and the silica gel is resistant to acid and alkali, still capable of efficiently adsorbing automobile exhaust molecules under strong acid and strong alkali conditions, and stable in adsorption performance.

Description

technical field [0001] The invention relates to an acid and alkali resistant three-way catalytic converter formula and a preparation method thereof, belonging to the technical field of environmental protection catalysis. Background technique [0002] The three-way catalytic converter is the most important external purification device installed in the automobile exhaust system. It can convert harmful gases such as CO, HC and NOx emitted from automobile exhaust into harmless carbon dioxide, water and nitrogen. When the high-temperature automobile exhaust gas passes through the purification device, the purification agent in the three-way catalytic converter will enhance the activity of the three gases CO, HC and NOx, and promote them to undergo a certain oxidation-reduction chemical reaction, in which CO is oxidized at high temperature to become non-toxic. Color, non-toxic carbon dioxide gas; HC compounds are oxidized to water and carbon dioxide at high temperature; NOx is red...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/28B01J23/63
CPCB01J23/002B01J23/63F01N3/101F01N3/2825F01N2250/12F01N2330/08F01N2570/10F01N2570/14Y02A50/20Y02T10/12
Inventor 孟晓辉孟雷军
Owner SUZHOU LIANCHI ENVIRONMENTAL SCI & TECH DEV CO LTD
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