Hierarchical porous supported nickel-based catalyst, preparation method and application
A nickel-based catalyst, supported technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as carbon deposition, deactivation, and easy sintering, and achieve long catalyst life and enhanced Effects of interaction, excellent carbon deposition and sintering resistance
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[0047] Example 1 Preparation and characterization of catalyst samples CAT-1~CAT-11
[0048] A certain amount of nickel salt was dissolved in 10 ml of ethanol to make a solution, and 5 g of multi-porous alumina was added. After a period of ultrasonic immersion, the solvent and excess unabsorbed nickel salt were removed by filtration. After the aluminum oxide adsorbing nickel ions is vacuum dried at 80° C. for 8 hours, it is calcined in an air atmosphere, and finally reduced with hydrogen to obtain the multi-stage pore supported nickel-based catalyst.
[0049] ICP is used to determine the nickel content on the multi-stage pore supported nickel-based catalyst. The transmission scanning electron microscope was used to observe the size range of the nickel particles on the multi-porous supported nickel-based catalyst.
[0050] The relationship between the sample number and the specific experimental parameters, the mass percentage of nickel element in the multi-porous supported nickel-base...
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[0054] Example 2 Evaluation of catalyst reaction
[0055] Take 0.2g of the catalyst sample CAT-1 and place it in a fixed-bed reactor with an inner diameter of 1 cm. After performing online hydrogen reduction, the temperature is adjusted to the reaction temperature. Switch gas to CO 2 And CH 4 Mixed gas, N 2 As an internal standard. After the reaction, the gas is cooled and enters the gas chromatography to detect the concentration of each substance and calculate the CO 2 And CH 4 Conversion rate.
[0056] Reaction conditions and CO 2 And CH 4 The relationship of the conversion rate is shown in Table 2.
[0057] When the reaction condition is A, the chromatographic detection result of the reaction tail gas is as follows figure 2 Shown. It can be seen from the figure that the multi-stage pore supported nickel-based catalyst provided by this application has good selectivity, and the product is basically the main components of synthesis gas: hydrogen and carbon monoxide.
[0058] Table ...
Example Embodiment
[0066] Example 3 Evaluation of catalyst stability
[0067] Take 0.2g of the catalyst sample CAT-1 and place it in a fixed bed reactor with an inner diameter of 1 cm. Under the reaction condition A of Example 2, the catalyst stability was evaluated. The results are as follows image 3 Shown. by image 3 It can be seen that the multi-stage pore supported nickel-based catalyst provided by the present application has excellent stability under normal pressure and 800°C reaction conditions, and the conversion rate of carbon dioxide and methane remains basically unchanged within 100 hours of reaction time.
[0068] The TEM photos of the catalyst sample CAT-1 before and after the reaction are as follows Figure 4 Shown. Figure 4 (a) is a transmission electron microscope photo of the sample CAT-1 before the reaction; Figure 4 (b) is a transmission electron micrograph of sample CAT-1 after reacting at 800°C for 102 hours. It can be seen from the figure that the active component nickel part...
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