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OALib Journal期刊
ISSN: 2333-9721
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含有多级孔复合分子筛的复合催化剂上合成气一步制二甲醚
, PP. 875-882
Keywords: 复合分子筛,二甲醚,复合催化剂,多级孔结构,合成气,甲醇脱水
Abstract:
？以beta分子筛为核、y型分子筛为壳层的多级孔复合分子筛(bfz)作为甲醇脱水催化剂用于固定床中合成气一步法制备二甲醚,并与纯y型分子筛进行了比较,研究了二甲醚合成催化反应活性与甲醇脱水催化剂孔道结构和酸性之间的关系.结果表明,复合分子筛hbfz具有中等强度的酸性和中孔孔道结构,有利于提高合成气制备二甲醚的催化反应活性.二甲醚直接合成催化剂由工业cuo/zno/al2o3催化剂(cza)与分子筛(hbfz、hy)采用机械混合方法制备;催化评价结果显示,cza/hbfz比cza/hy具有更优的催化活性和稳定性.在250℃,5.0mpa和1500h-1的反应条件下,cza/hbfz催化剂上co的转化率和dme的选择性分别达到94.2%和67.9%.
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