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Nanogold catalyst as well as preparation method and application thereof

A technology of catalyst and oxidative esterification, which is applied in the direction of catalyst activation/preparation, catalyst carrier, chemical instrument and method, etc., and can solve problems such as unfavorable industrial production

Active Publication Date: 2021-03-09
SHANGHAI HUAYI GRP CO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Chinese patent CN105722816A discloses the method that can use oxygen and methanol to directly oxidize and esterify methacrolein to prepare methyl methacrylate. The catalyst is selected as supported on SiO 2 -Al 2 o 3 -Gold catalyst on MgO, but this method needs to add additional alkali to control the pH value of the reaction solution to achieve the purpose of promoting esterification, and there is a certain operational risk
[0010] Chinese patent CN107899575A discloses a method for preparing a nano-gold catalyst for one-step oxidative esterification of alcohol and aldehyde to generate ester. The carrier of the catalyst is a cerium-based composite solid solution, which requires hydrothermal synthesis to obtain cerium oxide with a high specific surface area. And the method of loading gold by sol precipitation requires additional use of a large amount of PVA protective agent and NaBH 4 , not conducive to industrial production

Method used

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  • Nanogold catalyst as well as preparation method and application thereof
  • Nanogold catalyst as well as preparation method and application thereof

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preparation example Construction

[0040] The invention also relates to a method for the preparation of the catalyst. The preparation method of catalyst of the present invention comprises the steps:

[0041] a) dissolving the aluminum source, zinc source, cobalt source and / or lanthanum source into a solution according to the required molar ratio

[0042] The solvent suitable for forming the solution is not particularly limited, but water is preferred from the viewpoints of cost and environmental protection.

[0043] The aluminum source, zinc source, cobalt source and / or lanthanum source suitable for the method of the present invention are not particularly limited, as long as they can form a solution in water. In one example of the present invention, the aluminum source is selected from aluminum nitrate, aluminum chloride, aluminum sulfate or a mixture thereof, preferably aluminum nitrate.

[0044] In one example of the present invention, the zinc source is selected from zinc nitrate, zinc chloride, zinc sulfate...

Embodiment 1

[0084] Weigh 23.80g of zinc nitrate hexahydrate, 30.01g of aluminum nitrate nonahydrate and 1.04g of cobalt nitrate hexahydrate and dissolve them in 80mL of deionized water, stir for 15 minutes to form solution A, and weigh 12.80g of Sodium and 6.78g of sodium carbonate were dissolved in 80mL of deionized water and stirred for 15-30 minutes to form solution B. Slowly add solution B to solution A, and age at 70°C for 10 hours, filter, wash and dry, and bake in a muffle furnace at 600°C for 5 hours to obtain about 10.8g of the carrier, which is ground and sieved to obtain 100-200 mesh granules are ready for use.

[0085] Weigh 0.0659g of chloroauric acid and 3.66g of urea and dissolve them in 30mL of deionized water, stir for 15 minutes, then add 3g of carrier, stir and age in a water bath at 80°C for 6 hours, filter, and wash until there is no chloride ion After detection, oven at 110° C. overnight, and muffle furnace at 300° C. in air for 5 hours, the catalyst was obtained. ...

Embodiment 2

[0089] With embodiment 1, sodium carbonate consumption 20.35g, do not use sodium hydroxide, the results are shown in Table 1.

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Abstract

The invention discloses a nanogold catalyst as well as a preparation method and application thereof. The catalyst comprises a solid solution carrier with the general formula of ZnaAlMbOx and a gold element loaded on the carrier, and according to the total weight of the catalyst, the loading amount of gold is 0.5-3.0 wt%; in the carrier, M is selected from Co, La or a mixture thereof; and a is equal to 0.1-4.0, b is equal to 0.01-0.30, and x is the amount of oxygen element satisfying the chemical value of the compound.

Description

technical field [0001] The invention relates to a supported nano-gold catalyst, which has high selectivity and conversion rate when it is used for oxidative esterification of methacrolein to prepare methyl methacrylate. The invention also relates to the preparation method of the catalyst and its use in the preparation of methyl methacrylate through oxidative esterification of methacrolein. Background technique [0002] Methyl methacrylate (MMA) is an important organic chemical raw material, mainly used in the production of plexiglass, plastics, coatings, adhesives, modifiers and other fine chemicals. Since the 1980s, the application field of MMA has continued to develop, and has been widely used in aviation, aerospace, electronics and chemical machinery and other fields. Moreover, the production capacity of domestic MMA is far less than the actual demand, and a large amount of imports are relied on, so the contradiction between supply and demand is prominent. [0003] At p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/80B01J23/10B01J32/00B01J23/89B01J23/52B01J37/03C07C67/39C07C69/54
CPCB01J23/80B01J23/10B01J23/8953B01J37/03B01J23/002B01J23/52C07C67/39B01J2523/00B01J35/394B01J35/23C07C69/54B01J2523/27B01J2523/31B01J2523/845Y02P20/584
Inventor 王正宝宁春利宋彦任马建学佘海英庄岩张俊佳娄报华龙奕华
Owner SHANGHAI HUAYI GRP CO
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