Iron-based composite catalyst for on-line upgrading of bio-oil and its preparation and application method
A composite catalyst, bio-oil technology, applied in chemical instruments and methods, preparation of liquid hydrocarbon mixtures, catalysts for physical/chemical processes, etc., can solve the problems of easy sintering deactivation, low catalytic activity, easy carbon deposition deactivation, etc. Achieve the effect of preventing catalyst deactivation, improving catalytic activity, and increasing calorific value
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Embodiment 1
[0027] Embodiment 1: a kind of preparation method of iron-based composite catalyst, it comprises the steps:
[0028] Preparation of LDHs precursors: according to Mg 2+ : Ca 2+ : Fe 3+ :Al 3+ Weigh 48.10g Mg(NO 3 ) 2 ∙6H 2 O, 44.27g Ca(NO 3 ) 2 ∙6H 2 O, 75.50g Fe(NO 3 ) 3 ∙9H 2 O and 70.89g Al(NO 3 )2 ∙9H 2 O was added to deionized water to form a 500 ml mixed solution, and 50.99g NaNO was weighed 3 Add deionized water to prepare a 500 ml mixed solution, and weigh 56g NaOH and add deionized water to prepare an 800 mL alkali solution with a concentration of 2M. NaNO 3 Pour the solution and NaOH solution into a four-necked flask, add the mixed salt solution dropwise to the above mixed alkali solution under mechanical stirring, so that the pH of the final solution is 11.2, crystallize the resulting slurry at room temperature for 24 hours, and use deionized water Wash and centrifuge 4 times, dry at 100°C for 12 hours, and grind to obtain the LDHs precursor.
[0029...
Embodiment 2
[0035] The preparation method of the catalyst in this embodiment is the same as that of Example 1 and will not be repeated, the difference is that the active component content is different, wherein Mg 2+ : Ca 2+ : Fe 3+ :Al 3+ The molar ratio is about 4:4:1:1. The composition and mass percentage of the prepared catalyst were Fe: 11.41%, CaO: 42.06%, Mg(Al)O: 46.53%, and no other impurity phases were found, and the average size of Fe nanoparticles was 5.2 nm.
[0036] On-line upgrading of the crude bio-oil product was performed under the same cracking conditions as in Example 1. Experimental research found that compared with the crude product of bio-oil, the acidic substances in the refined bio-oil were completely removed, the content of aldehydes and ketones was reduced to 5.46%, and the content of hydrocarbons increased to 33.52% (the content of aliphatic hydrocarbons was 18.89%, the content of aromatic hydrocarbons is 14.63%), the content of phenolic compounds slightly i...
Embodiment 3
[0038] The composition and mass percentage of the catalyst in this example are consistent with Example 1, being Fe: 27.78%, CaO: 28.06%, Mg(Al)O: 44.16%, no other impurity phases are found, and the average size of Fe nanoparticles 7.3nm. The preparation method is the same as in Example 1, and will not be repeated here.
[0039] The application method of using the above-mentioned iron-based composite catalyst for bio-oil online upgrading is the same as Example 1 and will not be repeated. The difference from Example 1 is that the catalyst and wood powder are loaded in different ways during the bio-oil upgrading process. Specifically In order to put 0.5mg of wood powder and 10mg of catalyst into the sample tube and shake them to mix them evenly. Experimental research found that the content of acidic substances in the upgraded bio-oil was 16.18%, the content of hydrocarbons was 20.58% (of which the content of aliphatic hydrocarbons was 4.32%, the content of aromatic hydrocarbons ...
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