Catalyst for synthesizing methanol by direct hydrogenation of carbon dioxide and preparation method thereof

A carbon dioxide and methanol synthesis technology, which is applied in the preparation of organic compounds, catalyst activation/preparation, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of poor methanol selectivity and low conversion rate of carbon dioxide, and achieve high performance Stabilize and overcome the effect of low conversion rate

Inactive Publication Date: 2010-04-07
XIAMEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a catalyst for the direct hydrogenation of carbon dioxide to methanol and its preparation method in view of the shortcomings of existing carbon dioxide hydrogenation methanol synthesis catalysts, such as low conversion rate of carbon dioxide and poor selectivity of methanol.

Method used

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  • Catalyst for synthesizing methanol by direct hydrogenation of carbon dioxide and preparation method thereof
  • Catalyst for synthesizing methanol by direct hydrogenation of carbon dioxide and preparation method thereof

Examples

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Embodiment 1

[0017] Copper nitrate, chromium nitrate, lanthanum nitrate and citric acid were formulated into a 0.5M mixed solution at a ratio of 0.1:0.9:1.0:1.5. It becomes a sol under the irradiation of an infrared lamp, and is quickly ignited on an electric furnace. The obtained solid powder is calcined at 400°C for 2 hours, and then calcined at 800°C for 4 hours. The resulting perovskite LaCr 0.9 Cu 0.1 o 3 Precursor, compressed into 40-60 mesh. Take 0.5g of the precursor and reduce it at 350°C under normal pressure for 6h (flow rate 60ml / min) and switch to the reaction raw material gas for reaction. The reaction conditions are: pressure 2.0MPa, temperature 250°C, V(H 2 ) / V(CO 2 ) / V(N 2 )=64:31:5, GHSV=9000ml / (h.g), the product is detected and analyzed by TCD and FID detectors, and the conversion rate of carbon dioxide, methanol selectivity and other by-product selectivity are shown in Table 1.

Embodiment 2

[0019] Copper nitrate, chromium nitrate, lanthanum nitrate and citric acid were formulated into a 0.4M mixed solution at a ratio of 0.3:0.7:1.0:1.0. It becomes a gel under the irradiation of infrared lamp, calcined at 350°C for 2h, and then calcined at 750°C for 4h. The obtained perovskite LaCr 0.7 Cu 0.3 o 3 It is the oxidation state precursor of the catalyst, and the catalytic activity evaluation is the same as in Example 1, and the results are shown in Table 1.

Embodiment 3

[0021] Copper nitrate, chromium nitrate, lanthanum nitrate and citric acid have been formulated into a 0.5M mixed solution at a ratio of 0.5:0.5:1.0:2.0. It becomes a gel under the irradiation of infrared lamp, calcined at 350°C for 2h, and then calcined at 750°C for 4h. The obtained perovskite LaCr 0.5 Cu 0.5 o 3 It is an oxidized state precursor, and the catalyst activity evaluation is the same as in Example 1, and the evaluation results are shown in Table 1.

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Abstract

The invention discloses a catalyst for synthesizing methanol by direct hydrogenation of carbon dioxide and a preparation method thereof and relates to the catalyst. The invention provides the catalyst for synthesizing the methanol by direct hydrogenation of the carbon dioxide and the preparation method thereof. The catalyst is LaCr1-xCuxO3, wherein x is the relative mole fraction of a main component of Cu, x is equal to 0.1-0.9, and La: Cr: Cu is equal to 1: (1-x): x. The preparation method comprises the steps of preparing copper nitrate, chromium nitrate, lanthanum nitrate and citric acid into water solution, forming a sol under the radiation of an infrared lamp, heating, decomposing nitrogen oxides and organic acids, pre-baking in an atmosphere furnace at the temperature of 350-450 DEG C for 2-4h, baking at the temperature of 700-800 DEG C, and obtaining the catalyst for synthesizing the methanol by direction hydrogenation of the carbon dioxide. The citric acid complexation-rapid combustion method is adopted for overcoming the disadvantages of lower conversion rate, poorer selectivity of the methanol and the like during the catalysis of the carbon dioxide by using the existing catalyst for synthesizing the methanol by hydrogenation of the carbon dioxide, and the prepared catalyst has stable performances.

Description

technical field [0001] The invention relates to a catalyst, in particular to a catalyst for directly hydrogenating carbon dioxide to synthesize methanol and a preparation method thereof. Background technique [0002] my country's energy structure is dominated by fossil fuels such as coal and petroleum, and the carbon dioxide greenhouse gas produced during the combustion process is the main cause of global warming. At present, the conversion and utilization of carbon dioxide is one of the effective methods to reduce the total amount of greenhouse gas emissions. The direct catalytic hydrogenation of carbon dioxide into methanol not only enables the utilization of carbon dioxide, but also provides oxygen-containing low-carbon and clean fuels and chemical raw materials, which has become the direction of carbon dioxide conversion and utilization. Utilizing by-product hydrogen from chlor-alkali and other enterprises to carry out catalytic hydrogenation of carbon dioxide to produc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/86B01J37/00B01J37/34C07C31/04C07C29/154
CPCY02P20/52
Inventor 贾立山高敬李清彪方维平
Owner XIAMEN UNIV
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