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Heterogeneous catalytic wet oxidation catalyst and preparation method thereof

A technology of wet oxidation and heterogeneous catalysis, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the problems of low COD removal rate and poor stability, Achieve high-efficiency processing, good binding, and good stability

Active Publication Date: 2015-11-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] One of the technical problems to be solved by the present invention is the problem of low COD removal rate and poor stability in the heterogeneous catalytic wet oxidation reaction in the prior art, and a new heterogeneous catalytic wet oxidation catalyst is provided

Method used

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  • Heterogeneous catalytic wet oxidation catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Prepare 0.8mol / lTi(SO 4 ) 2 , 0.4mol / l ZrOCl 2 ·8H 2 O and 0.2mol / l Ce(NO 3 ) 3 ·6H 2 O mixed solution 100ml and 0.6mol / l ammonia water 500mL. The mixed solution of cerium salt, zirconium salt and titanium salt is co-precipitated with ammonia water to form a gel substance, which is vacuum filtered, washed, dried, and roasted at 800°C for 4 hours to make TiO 2 -ZrO 2 -CeO 2 carrier.

[0024] 1.98gCeO 2+ Immersed in 0.052gRuCl 3 in aqueous solution. Impregnated at room temperature for 15 hours, then dried in an oven at 110°C for 8 hours, then calcined in a muffle furnace at 450°C for 5 hours to obtain a catalyst precursor, and finally reduced with hydrogen at 400°C for 4 hours to obtain a finished catalyst.

[0025] In the foregoing examples, the same evaluation conditions for the above-mentioned heterogeneous catalytic wet oxidation reaction are:

[0026] Reactor: fixed bed reactor, inner diameter 22 mm, reactor length 800 mm

[0027] Filling volume: 300ml ...

Embodiment 2～8

[0035] The steps in Examples 2-8 are the same as in Example 1, except that the molar ratio of the composite carrier elements, the type and ratio of precious metals and the type of waste water are different. The specific conditions and results are listed in Table 1.

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Abstract

The invention relates to a heterogeneous catalysis wet-type oxidation catalyst for treatment by a heterogeneous catalysis wet-type oxidation process and a preparation method of the heterogeneous catalysis wet-type oxidation catalyst, and mainly aims to solve the problems of low COD (chemical oxygen demand) removal rate and poor stability in the prior art. The heterogeneous catalysis wet-type oxidation catalyst disclosed by the invention comprises the following components in parts by weight: (A) 98.0-99.7 parts of a composite carrier and (B) 0.3-2.0 parts of at least one type of noble metal which is selected from Ru, Pd, Pt or Au and is carried on the composite carrier, wherein the composite carrier comprises the following components in percentage by weight: (a) 35-55% of TiO2, (b) 25-45% of ZrO2 and (c) 15-35% of CeO2. By adopting the technical scheme of the heterogeneous catalysis wet-type oxidation catalyst and the preparation method thereof, the problems are well solved, and the heterogeneous catalysis wet-type oxidation catalyst can be used for treating industrial wastewater.

Description

technical field [0001] The invention relates to a heterogeneous catalytic wet oxidation catalyst and a preparation method thereof. Background technique [0002] In the late 1970s, on the basis of wet oxidation technology, catalytic wet oxidation was developed to decompose organic matter and harmful substances containing N and S in sewage into CO 2 , N 2 , SO 4 = and H 2 O and other harmless substances. Catalytic wet oxidation technology can treat wastewater alone or as a pretreatment of biochemical treatment. Through wet oxidation, the COD of wastewater can be reduced, toxic and harmful substances to biochemical bacteria can be removed, and the biodegradability of wastewater can be improved. On the other hand, with the increasing pressure of energy saving and consumption reduction, environmental protection control is becoming more and more stringent. Wastewater with high concentration of organic matter will be incinerated by incinerators, which will cause double pressur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/63C02F1/74
Inventor 郑育元汪国军郭宗英陈航宁
Owner CHINA PETROLEUM & CHEM CORP