A kind of hierarchical porous molecular sieve and preparation method thereof
A molecular sieve and multi-stage pore technology, applied in the direction of crystalline aluminosilicate zeolite, octahedral crystalline aluminosilicate zeolite, borocarbane silicone crystalline aluminosilicate zeolite, etc. Complicated operation process, expensive templating agent, etc., to achieve good environmental and economic benefits, high yield, and effective utilization
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Embodiment 1
[0033] The enzymolysis residue used is enzymolysis corn stalk residue. The specific process is: after the corn stalk is pretreated by steam explosion, it is enzymatically hydrolyzed by cellulase to convert most of the cellulose and hemicellulose in the straw into hydrolyzed sugar. The enzymolysis residue was obtained after liquid separation. On a dry basis, the lignin content in the dry basis is 60wt%, the cellulose content is 8wt%, the hemicellulose content is 2wt%, the ash content is 18wt%, and the soluble component is 12wt%. After testing, the main components and contents in the ash are: C 7wt%, O37wt%, Si 32wt%, Fe, Ca, Na and other metal ions 22%, other 2%.
[0034] Concrete preparation process is as follows:
[0035] (1) Crush the residue of enzymatically hydrolyzed corn stalks to 100-200 mesh, and dry in vacuum at 80°C for 24 hours.
[0036](2) Take 1L of deionized water, 1L of ethanol, and 10g of NaOH to prepare a mixed solution, add 100g of pretreated corn stalk res...
Embodiment 2
[0042] The same enzymatic hydrolysis of corn stalk residue as in Example 1 was used.
[0043] (1) Crush the residue of enzymatically hydrolyzed corn stalks to 100-200 mesh, and dry in vacuum at 50°C for 24 hours.
[0044] (2) Take 0.5L deionized water, 0.5L ethanol, and 1g NaOH to prepare a mixed solution, add 100g of pretreated corn stalk residue, heat up to 180°C, stir for 3 hours, and filter after the reaction is completed. The filtrate was rotary evaporated to obtain 35 g of earth brown enzymatic lignin.
[0045] (3) Wash the filter residue with water until neutral, dry at 80°C for 5 hours, add 7mL of 7wt% NaOH lye per gram of filter residue, treat at 100°C for 12 hours, and filter to obtain solution A.
[0046] Step (4) is the same as in Example 1. The characteristics of the prepared hierarchical porous ZSM-5 molecular sieve are shown in Table 1.
Embodiment 3
[0048] The same enzymatic hydrolysis of corn stalk residue as in Example 1 was used.
[0049] (1) Crush the enzymatically hydrolyzed corn stalk residue to 100-200 mesh, and vacuum-dry at 100°C for 12 hours.
[0050] (2) Take 1.2L of deionized water, 1.8L of ethanol, and 27g of NaOH to prepare a mixed solution, add 100g of the residue of enzymatically hydrolyzed corn stalks after pretreatment, mix well, heat up to 220°C, stir for 1 hour, and filter after the reaction is completed. The filtrate was rotary evaporated to obtain 55 g of earth brown enzymatic lignin.
[0051] (3) Wash the filter residue with water until neutral, dry at 120°C for 2 hours, add 3 mL of 10wt% NaOH lye per gram of filter residue, treat at 120°C for 8 hours, and filter to obtain solution A.
[0052] Step (4) is the same as in Example 1. The characteristics of the prepared hierarchical porous ZSM-5 molecular sieve are shown in Table 1.
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