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Synthesis and application of ultrahigh-dispersion high-load Pd/alpha-MoC supported catalyst

A supported catalyst and catalyst technology, applied in the field of catalysis, can solve the problems of CO poisoning, poor thermal stability, and high cost, and achieve the effects of wide application prospects, improved CO selectivity, and improved activity.

Active Publication Date: 2020-06-09
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Cu-based catalysts have disadvantages such as easy sintering at high temperature and poor thermal stability.
Another commonly used Ni-based catalyst is more stable than Cu-based catalysts, but Ni-based catalysts can further promote the continuous hydrogenation of CO generated by RWGS reaction to CH 4 , which is not conducive to the selectivity of CO, especially under the condition of rich hydrogen and the temperature range of 200-400 °C, the methanation phenomenon is more obvious
Although noble metal catalysts have high activity, they are prone to CO poisoning and the cost is high

Method used

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  • Synthesis and application of ultrahigh-dispersion high-load Pd/alpha-MoC supported catalyst
  • Synthesis and application of ultrahigh-dispersion high-load Pd/alpha-MoC supported catalyst
  • Synthesis and application of ultrahigh-dispersion high-load Pd/alpha-MoC supported catalyst

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Experimental program
Comparison scheme
Effect test

Embodiment l

[0031] Synthesis of 1wt%Pd / α-MoC catalyst (MoO 3 670mg).

[0032] Dissolve 0.0125 g of palladium nitrate hydrate, the precursor of palladium, in an appropriate amount of water, and impregnate the palladium nitrate solution into MoO by supersaturated impregnation method 3 On the carrier, where MoO 3 Ultrasonic dispersion in appropriate amount of distilled water. Then the mixture was stirred at room temperature for 4 hours, and then the solvent was removed by a rotary evaporator, dried in a vacuum oven at 60°C, and then the catalyst was fired in a muffle furnace, and the temperature was programmed to 500°C And keep it for 120min. Last at 20% CH 4 / H 2 The carbonization temperature was programmed to 700°C in an atmosphere and kept for 120min.

[0033] The 1wt% Pd / α-MoC supported catalyst synthesized in the present invention is characterized by its structure and crystal phase by X-ray diffractometer (XRD), and its morphology characteristics are observed by transmission elec...

Embodiment 2

[0037] Synthesis of 2wt%Pd / α-MoC catalyst (MoO 3 670mg)

[0038] Dissolve 0.025 g of palladium nitrate hydrate, the precursor of palladium, in an appropriate amount of water, and impregnate the palladium nitrate solution into MoO by supersaturated impregnation method 3 On the carrier, where MoO 3 Ultrasonic dispersion in appropriate amount of distilled water. Then the mixture was stirred at room temperature for 4 hours, then the solvent was removed by a rotary evaporator, dried in a vacuum oven at 60°C, and then the catalyst was fired in a muffle furnace, and the temperature was programmed to 500°C And keep it for 120min. Last at 20% CH 4 / H 2 The carbonization temperature was programmed to 700°C in an atmosphere and kept for 120min.

Embodiment 3

[0040] Synthesis of 5wt%Pd / α-MoC catalyst (MoO 3 670mg)

[0041] Dissolve 0.065 g of the palladium precursor palladium nitrate hydrate in an appropriate amount of water and impregnate the palladium nitrate solution into MoO by supersaturated impregnation method 3 On the carrier, where MoO 3 Ultrasonic dispersion in appropriate amount of distilled water. Then the mixture was stirred at room temperature for 4 hours, then the solvent was removed by a rotary evaporator, dried in a vacuum oven at 60°C, and then the catalyst was fired in a muffle furnace, and the temperature was programmed to 500°C And keep it for 120min. Last at 20% CH 4 / H 2 The carbonization temperature was programmed to 700°C in an atmosphere and kept for 120min.

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Abstract

The invention discloses a method for synthesizing an ultrahigh-dispersion and stable Pd-loaded molybdenum carbide (alpha-MoC) catalyst. The preparation method comprises the following steps: loading aPd-containing precursor solution on a MoO3 carrier, removing a solvent by using a rotary evaporator, drying at 40-60 DEG C, roasting in a muffle furnace at 200-700 DEG C, and finally carbonizing in acarbonization gas atmosphere to obtain the ultrahigh-dispersion Pd / alpha-MoC catalyst, wherein the mass percentage content of Pd is 0.1-10 wt%, the carbonization atmosphere is mixed gas of alkane gasand hydrogen, the alkane gas comprises methane, ethane, ethylene and the like, the alkane gas accounts for 10-25% of the volume of the mixed gas (alkane gas and hydrogen), the carbonization temperature is 500-800 DEG C, and the temperature rising speed ranges from 1 DEG C / min to 15 DEG C / min. The Pd / alpha-MoC supported catalyst has good catalytic activity in a reverse water gas shift reaction system, and can be applied to preparation of synthesis gas under a hydrogen-rich condition.

Description

technical field [0001] The invention belongs to the field of catalysis, and relates to a Pd / α-MoC supported catalyst and its synthesis and application, in particular to the synthesis of an ultra-highly dispersed and high-loaded Pd / α-MoC supported catalyst with an efficient reverse water gas shift reaction with application. Background technique [0002] With the development of industry, the greenhouse gas CO 2 content continues to increase, how to reduce CO 2 Efficient conversion into fuels or high-value chemicals has become an urgent problem for scientists. Study vs. CO 2 CO in different reaction pathways for hydrogenation to liquid fuels 2 Utilization efficiency, indicating that CO is converted by the reverse water vapor shift (RWGS) reaction 2 The conversion to intermediate CO followed by Fischer-Tropsch synthesis for fuel generation has the optimal CO 2 usage efficiency. In addition, CO can not only be used as a feedstock for the Fischer-Tropsch process, but also d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/22C01B3/04
CPCB01J27/22C01B3/04C01B2203/0277C01B2203/0283C01B2203/1064Y02E60/36
Inventor 刘岳峰马颖苏党生
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI