Modified zeolite molecular sieve as well as preparation method and application thereof

Abstract

The invention provides a modified zeolite molecular sieve as well as a preparation method and application thereof. The modified zeolite molecular sieve is obtained through modification treatment on anX type molecular sieve, wherein the modification treatment refers to the modification on the X type molecular sieve in an organic acid alcoholic solution. The zeolite molecular sieve provided by theinvention can be used as an adsorption agent for hopance in a geological sample, and is used for enriching the hopance in the geological sample. The zeolite molecular sieve can be subjected to effective and controllable modification according to requirements.

Description

technical field [0001] The invention relates to an enrichment method, in particular to a method for enriching hopane in geological samples, and belongs to the technical field of petroleum exploration. Background technique [0002] As an important inorganic material, molecular sieves are widely used as catalysts, adsorbents, ion exchangers and new functional materials. The International Union of Pure and Applied Chemistry (IUPAC) divides molecular sieves into three categories according to the pore size: micropores (<2nm), mesoporous (2-50nm) and macropores (>50nm). Due to the shape selectivity and different pore sizes of molecular sieves, different compounds or even molecules of different configurations of the same compound may behave differently in molecular sieves, so that the separation of monomeric compounds can be achieved without significant isotope fractionation effect. [0003] Microporous molecular sieves have been used for the separation and enrichment of spe...

AI Technical Summary

Problems solved by technology

The retention time of 17αhopane in 22R configuration is relatively longer than that of 22S 17αhopane because it is easier to enter the interior of molecular sieves, and 17αhopane, norhopane and 17βhopane, which lack long chains, are also hindered in molecular sieves. Relatively difficult to elute, they are incompletely eluted by isooctane together with 17αhopane of 22R

However, for the enrichment targets whose size is larger than the pore size, on the one hand, it is difficult to enter the pores, and on the other hand, after adsorption in the pores, the diffusion resistance is relatively large, and it is not easy to escape, which leads to certain types of commercial molecular sieves being sensitive to certain compounds. Enrichment effect is not good (Zhang Yu, Wang Hongguo, and Song Lijuan, Progress in Synthesis of Microporous-Mesopore Composite Molecular Sieves. Chemical Science and Technology, 2010(03): p.60-64.)

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