Method for preparing ZSM-5 molecular sieve by using solid wastes

A solid waste, ZSM-5 technology, applied in molecular sieve catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problem of reducing the space utilization rate of molecular sieve synthesis equipment, cannot completely avoid the use of solvents, and is not suitable for large-scale applications. and other problems, to achieve the effect of improving catalytic production efficiency, high crystallinity, and shortening the diffusion path

Active Publication Date: 2018-01-30
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above methods cannot completely avoid the use of solvents in the process of preparing ZSM-5 molecular sieves, resulting in a large amount of alkali-containing wastewater and reducing the space utilization of molecular sieve synthesis equipment
Solvent-free method means that no solvent is used in the molecular sieve preparation process. At present, the solvent-free method mainly uses pure chemical reagents as raw materials. After simple mixing

Method used

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  • Method for preparing ZSM-5 molecular sieve by using solid wastes
  • Method for preparing ZSM-5 molecular sieve by using solid wastes

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0033] Example 1:

[0034] Take 200 mesh rice husk ash as raw material, take 2g rice husk ash, add 0.2g sodium aluminate, 2.5g Na in turn 2 CO 3 ·10H 2 O and 0.2g TPABr were placed in a mortar to grind and mix for 5 minutes, and the mixture was placed in a sealed stainless steel reactor and heated to 100° C. and allowed to stand for crystallization for 72 hours. After the crystallization is completed, the filter cake is rapidly cooled, washed, and dried to obtain a crystalline product. After X-ray diffraction (XRD) test, the product belongs to ZSM-5 molecular sieve. The crystal size of ZSM-5 molecular sieve is 40-200nm. Fe and Mn impurities in the raw material enter the molecular sieve framework. The obtained ZSM-5 molecular sieve product contains both micropores and Mesoporous. See the XRD phase diagram figure 1 .

Example Embodiment

[0035] Example 2:

[0036] Take iron tailings as raw material, SiO 2 The content is 67%. Take 10g of iron tailings and activate them in a muffle furnace at 500°C for 3 hours, soak the activated product in water for 1 hour, adjust the pH of the filtrate to 9, stand for 12 hours, and dry to obtain the powder as the ZSM-5 molecular sieve synthesis material . Combine 2g filter residue, 0.2g sodium aluminate, 2.5g Na 2 CO 3 ·10H 2 O and 0.2g TPABr were placed in a mortar for grinding and mixing for 5 minutes, and the mixture was placed in a sealed stainless steel reactor and heated to 100° C. and allowed to stand for crystallization for 72 hours. After the crystallization is completed, the filter cake is rapidly cooled, washed, and dried to obtain a crystalline product. The crystal size of the ZSM-5 molecular sieve is 40-200 nm. The Fe and Mn impurities in the raw material enter the molecular sieve framework. The obtained ZSM-5 molecular sieve product also contains micro Pores and me...

Example Embodiment

[0037] Example 3:

[0038] Take iron tailings as raw material, SiO 2 The content is 67%. Take 10g of iron tailings and activate them in a muffle furnace at 500°C for 3 hours, soak the activated product in water for 1 hour, adjust the pH of the filtrate to 9, stand for 12 hours, and dry to obtain the powder as the ZSM-5 molecular sieve synthesis material . Combine 2g filter residue, 0.2g sodium aluminate, 2.5g Na 2 CO 3 ·10H 2 O and 0.2 g of the ZSM-5 molecular sieve obtained in the first embodiment were placed in a mortar for grinding and mixing for 5 minutes, and the mixture was placed in a sealed stainless steel reactor and heated to 100° C. and allowed to stand for crystallization for 72 hours. After the crystallization is completed, the filter cake is rapidly cooled, washed, and dried to obtain a crystalline product. The crystal size of the ZSM-5 molecular sieve is 40-200 nm. The Fe and Mn impurities in the raw material enter the molecular sieve framework. The obtained ZSM-5 ...

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Abstract

The invention relates to a method for preparing a ZSM-5 molecular sieve by using solid wastes, in particular to a preparation technology for synthesizing the ZSM-5 molecular sieve by using rice husk ash, iron tailings, gold tailings and other solid wastes as raw materials to provide all or part of silicon sources and aluminum sources required by the synthesizing of the ZSM-5 molecular sieve without solvent and NaOH (sodium hydroxide). The method comprises the following steps of mixing the silicon sources, the aluminum sources, Na2CO3-10H2O, a template agent or crystal grains, directly puttinginto a reaction kettle, and crystallizing at constant temperature, so as to obtain the ZSM-5 molecular sieve. The method has the advantages that by applying the Na2CO3-10H2O into the technology usingthe solid wastes as the raw material to synthesize the ZSM-5 molecular sieve, the secondary pollution is avoided in the synthesizing process; by using the rice husk ash, the iron tailings, the gold tailings and other solid wastes as the raw materials to synthesize the ZSM-5 molecular sieve by a non-solvent method, the technology is simple, and the application range is wide; the problem of environment due to solid wastes is relieved, and the utilization of solid wastes with high added value is realized.

Description

technical field [0001] The invention belongs to the fields of molecular sieve preparation and environmental protection. Specifically, it involves using rice husk ash, iron tailings and gold tailings to provide all or part of the silicon and aluminum sources required for the synthesis of ZSM-5 molecular sieves, and at the same time synthesize ZSM-5 containing hierarchical pores without the participation of solvent and NaOH A method for preparing ZSM-5 molecular sieves by using solid waste. Background technique [0002] Since ZSM-5 molecular sieve was first reported by Mobil Corporation of the United States (USP3702886) in 1972, due to its unique pore structure and shape-selective catalysis, it has been applied in many oil refining and chemical processes, and its preparation method is also constantly improving. From the initial synthesis using organic amine templates to the subsequent amine-free synthesis, the manufacturing cost of ZSM-5 has been significantly reduced, and th...

Claims

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Application Information

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IPC IPC(8): C01B39/38B82Y40/00B01J29/40
Inventor 李素芹张昌泉
Owner UNIV OF SCI & TECH BEIJING
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