Method for preparing acetic acid by one-step conversion of CH4 and CO2 through cooperation of low-temperature plasma and modified molecular sieve catalyst

Abstract

The invention relates to a method for preparing acetic acid by one-step conversion of CH4 and CO2 through cooperation of low-temperature plasma and a modified molecular sieve catalyst, and belongs tothe field of CH4 and CO2 conversion and utilization. The preparation method comprises the following steps: (1) modifying a molecular sieve by at least one of a water vapor passivation method, an acidtreatment method, an alkali treatment method, an alkali metal modification method, an alkaline earth metal modification method and a rare earth metal modification method; and (2) roasting the productobtained in the step (1) in a plasma atmosphere at 350-500 DEG C for 0.5-3 hours. According to the method, CH4 and CO2 are converted into acetic acid with high additional value by using a one-step method under the conditions of low temperature and normal pressure, the process is simple, the method is green, the atom economy is high, the problem that the conventional catalytic CH4 and CO2 reactionneeds high temperature (generally higher than 700 DEG C) is solved, and meanwhile, the additional value of the product converted from CH4 and CO2 is increased.

Description

technical field [0001] The invention relates to a low-temperature plasma and a modified molecular sieve catalyst for synergistic one-step conversion of CH 4 and CO 2 The method of producing acetic acid belongs to CH 4 and CO 2 transform the field of use. Background technique [0002] CH 4 and CO 2 It is the two main greenhouse gases in the atmosphere, and it is the main cause of aggravating the greenhouse effect and global warming. It is also an important raw material for one-carbon chemistry. CH 4 Widely distributed in nature, it is the main component of natural gas, biogas, oilfield gas and coal mine tunnel gas, and it is also a cheap, easy-to-obtain and abundant carbon and hydrogen source. Atmospheric CO 2 It mainly comes from human activities such as fossil fuel combustion, and its concentration and average annual emissions show an increasing trend year by year. It is estimated that by 2040, CO 2 Global emissions are about 35.7 billion tons. Therefore, CH 4 an...

AI Technical Summary

Problems solved by technology

[0018] Obviously, the above-mentioned transformation of CH using plasma technology 4 and CO 2 In the reports of one-step synthesis of acetic acid, the research focuses on the plasma reaction parameters, plasma reactor and added gas, and no molecular sieve and plasma synergistic conversion of CH 4 and CO 2 One-step Synthesis of Acetic Acid