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Graphene/molecular sieve/metal oxide composite catalyst and preparation method thereof

A composite catalyst and graphene technology, which is applied in the direction of molecular sieve catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of preparation that have not been reported, achieve excellent performance, and expand the effect of application fields

Active Publication Date: 2017-03-08
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the combination of graphene, molecular sieve and transition metal oxide has never been reported, nor has there been any report on the preparation of a ternary composite system with a quasi-two-dimensional sheet structure and its application in electrochemical catalysis.

Method used

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  • Graphene/molecular sieve/metal oxide composite catalyst and preparation method thereof
  • Graphene/molecular sieve/metal oxide composite catalyst and preparation method thereof
  • Graphene/molecular sieve/metal oxide composite catalyst and preparation method thereof

Examples

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Effect test

Embodiment 1

[0071] In this example, mesoporous ZSM-5 / graphene composites were prepared in the following manner, and the steps are as follows.

[0072]Weigh 120 mg of graphene, add 6 ml of deionized water, ultrasonically disperse evenly, weigh 1 g of tetrapropylammonium hydroxide and add it to the graphene aqueous solution, stir for 30 min to mix evenly, and record it as A solution; Add 60 mg of aluminum isopropoxide and 2 ml of tetraethyl orthosilicate in turn and stir evenly, and record it as solution B; firstly stir solution B at 30°C for 1 h, then raise the temperature to 90°C and stir for 24 h; then use this solution B with After repeated washing with ethanol and deionized water for 2 to 3 times, it was transferred to a polytetrafluoroethylene-lined autoclave for crystallization at 180 °C for 3 days to obtain ZSM-a / graphene composites. After the product was washed with ethanol and deionized water for 3–5 times, it was vacuum-dried at 100 °C for 12 h, calcined at 600 °C for 5 h, and th...

Embodiment 2

[0074] This example prepares Co in the following manner 3 o 4 / ZSM-5 / graphene composite, the steps are as follows.

[0075] Take by weighing 50 mg of ZSM-5 / graphene prepared in Example 1, add 10 g of water and 6 g of ethanol for ultrasonic dispersion, then slowly add dropwise 3 ml of ethanol solution containing 0.02 gTPHAC (drop rate 2 ml / min), after stirring for 5 h, slowly add 1 ml (0.03 M) of Co(NO 3 ) 2 solution, then continued to stir for 2 h, and finally slowly added 1 ml (1.2M) of NH 3 h 2 O solution, stirred for 12 h, centrifuged and washed several times until the effluent was close to neutral, dried in vacuum at 60 °C for 12 h, and finally calcined at 500 °C for 3 h to obtain Co 3 o 4 / ZSM-5 / Graphene. Its SEM and TEM photos are attached figure 1 , EDS results see figure 2 And table 1, XRD result sees image 3 , XPS results see Figure 4 , the results of electrocatalytic oxidation of methanol are shown in Figure 5 .

[0076] Table 1

[0077] .

Embodiment 3

[0079] Take by weighing 50 mg of ZSM-5 / graphene prepared in Example 1, add 20 g water and 12 g ethanol ultrasonic dispersion, and then slowly add dropwise the ethanol solution 6 ml containing 0.04 g TPHAC (drop rate 2 ml / min), after stirring continuously for 5h, slowly add 2 ml (0.03 M) of Co(NO 3 ) 2 solution, then continued to stir for 2 h, and finally slowly added 2 ml (1.2 M) of NH 3 h 2 O solution, stirred for 12 h, centrifuged and washed several times until the effluent was close to neutral, dried in vacuum at 60 °C for 12 h, and finally calcined at 500 °C for 3 h to obtain Co 3 o 4 / ZSM-5 / Graphene. The results of electrocatalytic oxidation of methanol are shown in Figure 6 .

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Abstract

The invention discloses a graphene / molecular sieve / metal oxide composite catalyst and a preparation method thereof. The catalyst comprises graphene, molecular sieve and metal oxide. The weight ratio of the three materials is 3-38% of the graphene, 40-91% of molecular sieve and 4-37% of metal oxide. The prepared composite material has quasi -2D laminated structure. The metal oxide particle size is 10-20 nanometers. The preparation method comprises the steps of 1, mixing the graphene, silicon source, aluminum source and surface active agent, separating the part containing graphene, conducting crystallization, at last conducting purification and removing the surface active agent to acquire the graphene / molecular sieve composite material, 2, loading the metal oxide on the graphene / molecular sieve. The three element composite material can be used for the methanol electro-catalysis and oxidation, oxygen reduction (ORR), OER, CO2 electro-catalysis reduction, and exert very good catalytic activity. The stability and the poison resistance are enormously elevated, thus having promising application prospect.

Description

technical field [0001] The invention relates to a graphene / molecular sieve / metal oxide composite catalyst and a preparation method thereof, belonging to the technical field of catalysts and preparation thereof. Background technique [0002] Molecular sieve catalysts are widely used in many fields such as industrial petroleum refining, catalysis and separation. ZSM-5 has a three-dimensional network microporous structure. It has become an indispensable solid acid catalyst with its unique pore structure, good catalytic performance, excellent hydrothermal stability and thermal stability, and has good shape selectivity. However, traditional molecular sieves are microporous, with 90% of the pores smaller than 2 nm. The pore size of conventional ZSM-5 is only 0.5 nm. Molecular sieves are disadvantageous in catalytic applications due to the limited transport pathways for molecules due to their microporous structure. In addition, the traditional ZSM-5 only has a microporous struct...

Claims

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Application Information

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IPC IPC(8): B01J29/46C25B3/02C25B3/00C25B1/04C25B1/00C25B3/23
CPCC25B1/00C25B1/04C25B3/00B01J29/46B01J2229/20B01J2229/18C25B3/23B01J35/33B01J35/40Y02E60/36
Inventor 王俊中王俊英张会念
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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