MgO改性CuZnAl催化剂上甲醇裂解制氢  

Methanol Decomposition on CuZnAl Catalysts with MgO Modified

作　　者：周性东 陈晓蓉[1,2] 梅华[1,2] 

机构地区：[1]南京工业大学化学化工学院,江苏南京210009 [2]南京(诺盟化工)催化氢化工程技术研究中心,江苏南京210009

出　　处：《精细化工》2016年第5期541-545,共5页Fine Chemicals

摘　　要：为了提高甲醇裂解制氢的气体收率,减少液相副产物的生成量,采用共沉淀法制备MgO改性CuZnAl催化剂,通过BET、XRD、SEM、H_2-TPR、CO2-TPD对催化剂结构和物化性能进行表征分析,固定床中考察MgO改性CuZnAl催化剂对甲醇裂解制氢催化性能。结果表明,引入适量的MgO可提高催化剂比表面积和CuO的分散度,改善催化剂氧化还原性,提高催化剂活性和选择性。得到优化的催化剂CuZnAlMg_2,其组分质量比为m(CuO)∶m(ZnO)∶m(Al_2O_3)∶m(MgO)=16∶13∶3∶2。在反应温度280℃、反应压力1.0MPa和空速0.6h-1条件下,CuZnAlMg_2催化剂上甲醇裂解转化率为99.1%,气体收率为97.0%。对液相产物进行分析表明,加入适量MgO提高催化剂碱性,能有效抑制液相副产物生成,提高气体收率。In order to improve the gas yield of methanol decomposition and reduce the production of the liquid byproduct,Mg O modified Cu Zn Al catalysts were prepared by coprecipitation method. The structure and physic-chemistry properties were characterized by BET,XRD,SEM,H2-TPR and CO2-TPD. The catalytic performance of Mg O modified Cu Zn Al catalysts for methanol decomposition to hydrogen was evaluated in a fixed-bed reactor. The results showed that the addition of Mg O to Cu Zn Al catalysts increased BET surface area of the catalysts and Cu O dispersity,modified the redox property of catalysts and enhanced the catalytic activity and selectivity. The optimization catalyst was achieved as Cu Zn Al Mg2,with mass ratio of m（ Cu O） ∶m（ Zn O） ∶m（ Al2O3） ∶m（ Mg O） = 16∶13∶3∶2. The conversion of methanol decomposition was 99. 1% and the gas recovery were 97. 0% over Cu Zn Al Mg2 under the reaction condition of reaction temperature 280 ℃,reaction pressure 1. 0 MPa and LHSV 0. 6 h- 1. The analysis to liquid products of methanol decomposition showed the adding suitable amount of Mg O improved the alkalinity of catalysts,effectively inhibited liquid by-products and increased the gas yield.

关 键 词：氧化镁 铜基催化剂 甲醇裂解 制氢 改性 催化与分离提纯技术 

分 类 号：O622.3[理学—有机化学] O643.38[理学—化学]