Modified natural stilbite used as methane adsorbent, and preparation method thereof

Abstract

The invention belongs to the technical field of chemical adsorbent, and specifically relates to modified natural stilbite used as a methane adsorbent, and a preparation method thereof. According to the invention, natural STI zeolite is adopted as a raw material, and is subject to ammonium solution exchange, such that NH4-STI zeolite is obtained; the NH4-STI zeolite is subject to high-temperature steam processing, such that H-STI zeolite is obtained; the H-STI zeolite is subject to magnesium ion exchange, such that magnesium-type STI (Mg-STI) zeolite is obtained. Methane adsorption capacity of the absorbent can reach 21.5mL/g, and a methane/nitrogen separation coefficient of the absorbent is higher than 3, such that the adsorbent can be adopted as an excellent high-efficiency methane adsorbent. Natural mineral resources adopted in the invention are advantaged in high grade, abundant reserves, and low exploitation cost. Also, the STI zeolite methane adsorbent preparation method is advantaged in simple technology and relatively low cost. The absorbent has a wide application prospect in gas separation and extraction in coal mines.

Description

technical field [0001] The invention belongs to the technical field of chemical adsorbents, and in particular relates to a modified natural stilbite used as a methane adsorbent and a preparation method thereof. Background technique [0002] Gas is also called biogas, 95% of which is methane gas (CH 4 ), also contains a small amount of carbon monoxide, carbon dioxide, etc., which are the most common harmful gases in coal mines. The greenhouse effect produced by methane is 21 times that of carbon dioxide. It is also colorless, tasteless, odorless, and non-toxic; its density is lower than that of air, and it gathers above the coal mine roadway. When it is high in the air, it can reduce the oxygen content. , causing suffocation; it is explosive, and the explosive concentration is generally 5~16%. my country's coalbed methane reserves are 36.8 trillion cubic meters, which is equivalent to 45 billion tons of standard coal or 35 billion tons of standard oil, which is equivalent t...

AI Technical Summary

Problems solved by technology

But we know that activated carbon itself is a kind of porous carbon material, the surface is very easy to accumulate charges, and at the same time it is extremely flammable in the air. It is very easy to cause the system to burn or explode

In fact, a serious explosion occurred in a large coal mine in China in the model experiment of using activated carbon for gas enrichment, which shows that activated carbon is very dangerous in gas purification and cannot be used as a methane adsorbent for gas Enrichment and recovery of methane in gas

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