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Supported catalyst used in selective synthesis, and preparation method and purpose thereof

A supported catalyst and catalyst technology, which can be used in the preparation of organic compounds, the preparation of carbon monoxide or formate reaction, chemical instruments and methods, etc., and can solve problems such as small surface area.

Active Publication Date: 2011-10-19
PUJING CHEM IND SHA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The catalyst supports currently used for the synthesis of dimethyl oxalate are basically α-Al 2 o 3 , the selectivity of dimethyl oxalate in the reaction product is higher, but its surface area is smaller

Method used

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  • Supported catalyst used in selective synthesis, and preparation method and purpose thereof
  • Supported catalyst used in selective synthesis, and preparation method and purpose thereof
  • Supported catalyst used in selective synthesis, and preparation method and purpose thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Selected (θ,α)-Al 2 o 3 The specific surface area of ​​the carrier is 65m 2 / g, of which theta phase accounted for 7.4%.

[0033] Take by weighing 20g carrier, prepare catalyst according to the content of Pd metal weight fraction 0.15wt% and Co metal weight fraction 0.2%, its steps are as follows: the aqueous solution that pH is 9 is prepared by ammonium bicarbonate and ammoniacal liquor and deionized water, by equal volume Immersion method Weigh a certain amount of the aqueous solution, then weigh a certain amount of palladium nitrate and cobalt nitrate and dissolve it in the aqueous solution. After completely dissolving without precipitation, spray and impregnate it on the carrier at room temperature, take out the carrier after 10 minutes, After drying at ℃ for 8 hours and then firing at 300℃ for 5 hours, Pd-Co / Al can be prepared 2 o 3 catalyst. The active ingredient content is measured by ICP, see Table 1.

[0034] Before the evaluation of the catalyst, the cat...

Embodiment 2

[0036] Weigh 25g (θ,α)-Al 2 o 3 Carrier, prepare catalyst according to the content of Pd metal weight fraction 0.05% and Bi metal weight fraction 0.15wt%, its steps are as follows: prepare the aqueous solution that pH is 9 by mixing ammoniacal liquor and ammonium bicarbonate and deionized water, weigh a certain amount by equal volume Then weigh a certain amount of palladium nitrate and bismuth nitrate and dissolve in the aqueous solution. After completely dissolving without precipitation, spray and impregnate it on the carrier at room temperature. After 10 minutes, take out the carrier and dry it at 125°C for 12 Hours, and then baked at 350°C for 6 hours, Pd-Bi / Al can be prepared 2 o 3 catalyst. The contents of the active ingredients are shown in Table 1.

[0037] With the evaluation conditions of Example 1, the catalyst activity evaluation results are shown in Table 2.

Embodiment 3

[0039] Weigh 20g (θ,α)-Al 2 o 3 Carrier, prepare catalyst according to the content of Pd metal weight fraction 0.8% and iron metal weight fraction 0.05wt%, its steps are as follows: prepare the aqueous solution that pH is 8.3 by mixing ammonium bicarbonate and ammoniacal liquor and deionized water, weigh by equal volume A certain amount of this aqueous solution, then weigh a certain amount of palladium nitrate and ferric nitrate and dissolve it in the aqueous solution. After completely dissolving without precipitation, spray and impregnate it on the carrier at room temperature. After 15 minutes, take out the carrier and dry it at 135°C. 8 hours, and then baked at 350°C for 5 hours, the Pd-Fe / (θ,α)-Al can be prepared 2 o 3 catalyst. The contents of the active ingredients are shown in Table 1.

[0040] With the evaluation conditions of Example 1, the catalyst activity evaluation results are shown in Table 2.

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Abstract

The invention relates to a supported catalyst used in selective synthesis. The catalyst comprises a main active component, an auxiliary active component, and a catalyst carrier. The main active component is Pd and / or its oxide, wherein the weight percentage content of the main active component is 0.01% to 1.0%. The auxiliary active component is at least one of the metals of Fe, Ni, Co, and Bi, and / or at least one of the oxides of the metals of Fe, Ni, Co, and Bi, wherein the weight percentage content of the auxiliary active component is 0.01% to 0.5%. The left component is Al2O3, which is thecatalyst carrier. The invention also relates to a preparation method and a purpose of the catalyst. As an experiment result, with the adding of the catalyst, relative selectivity of mesoxalic dimethyl ester and dimethyl carbonate in reaction products can be modulated.

Description

technical field [0001] The invention relates to a supported catalyst for selective synthesis, a preparation method of the catalyst, and the use of the catalyst for the selective synthesis of dimethyl oxalate and dimethyl carbonate by CO and methyl nitrite gas-phase catalytic reaction process . Background technique [0002] As an important chemical raw material, dimethyl oxalate can be used to prepare oxalic acid, ethylene glycol, etc. or pharmaceutical intermediates. Among them, ethylene glycol is an important organic chemical raw material, which is mainly used to react with terephthalic acid (PTA) to produce polyethylene terephthalate (PET). In recent years, due to the strong demand for synthetic fibers, the growth rate of my country's ethylene glycol demand is much higher than that of my country's output growth rate. According to research by relevant institutions, my country's ethylene glycol imports exceeded 5.8 million tons in 2009, an increase of 12% over 2008. In 2011...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J23/644C07C69/36C07C67/36C07C69/96C07C68/00
Inventor 计扬骆念军毛彦鹏张博
Owner PUJING CHEM IND SHA
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