CATB改性SPAO-44分子筛吸附脱碱性氮研究

Study on Adsorption and Denitrification of CTAB Modified SAPO-44 Molecular Sieve

研究了十六烷基三甲基溴化铵(CTAB)改性SAPO-44分子筛对模拟油中的碱性氮化物吡啶的吸附特性。考察了CTAB物质的量对SAPO-44分子筛吸附碱性氮化物性能的影响,并对吸附脱碱性氮的吸附等温线、动力学、热力学进行了研究。结果表明,当添加的CTAB物质的量配比数值为0.06时,最大平衡吸附量达到7.24mg/g;与未改性SAPO-44分子筛相比,改性SAPO-44分子筛对碱性氮的吸附效果更好。改性SAPO-44分子筛对碱性氮的吸附等温线更符合Freundlich方程,该吸附过程符合拟二级动力学模型,吸附活化能为48.25kJ/mol。

The adsorption characteristics of the alkaline nitride pyridine in simulated oil onto sixteen alkyl three methyl bromide(CTAB)modified SAPO-44 molecular sieve were studied.The effects of the amount of CTAB on the adsorption of basic nitrides on SAPO-44 zeolites were investigated.Moreover,the adsorption isotherms,kinetics and thermodynamics of the adsorption of alkaline nitrogen were studied.The results showed that when the amount of CTAB added was 0.06,the maximum equilibrium adsorption capacity reached 7.24 mg/g.The CTAB modified SAPO-44 molecular sieve has better adsorption efficiency when compared with the unmodified SAPO-44 molecular sieve.The adsorption isotherm of alkaline nitride on CTAB modified SAPO-44 molecular sieve is more in line with the Langmuir equation.The adsorption process accords with the pseudo second-order kinetic model,and the adsorption activation energy is 48.25 kJ/mol.