【摘 要】
：
采用等体积浸渍法制备了活性炭球(CS)负载Ti(SO4)2的双功能催化剂,考察了焙烧温度对Ti(SO4)2/CS催化剂选择氧化二甲醚(DME)直接合成聚甲氧基二甲醚(DMMx)催化性能的影响.结果
【机 构】
：
中国科学院山西煤炭化学研究所煤转化国家重点实验室,山西太原 030001;中国科学院大学,北京 100049;中国科学院洁净能源创新研究院,辽宁大连 116023
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采用等体积浸渍法制备了活性炭球(CS)负载Ti(SO4)2的双功能催化剂,考察了焙烧温度对Ti(SO4)2/CS催化剂选择氧化二甲醚(DME)直接合成聚甲氧基二甲醚(DMMx)催化性能的影响.结果表明,不同焙烧温度制备的Ti(SO4)2/CS催化剂表现出明显的催化活性差异,280℃焙烧的30％Ti(SO4)2/CS催化剂具有最佳性能,DME转化率为11.7％,DMM1-3的选择性达到75.8％,其中,DMM2,3选择性在30％以上.采用SEM、XRD、Raman、TG、NH3-TPD及XPS等表征手段研究了催化剂的结构及表面性质.焙烧温度改变了活性炭球表面官能团的分布,进而影响了Ti(SO4)2的分散状态,调变了酸中心种类和数量,尤其是弱酸和中强酸的比例,使催化剂表面酸性强弱呈现不同梯度,催化剂的酸性和氧化还原性位达到比较合理的匹配,进一步促进了C-O链的增长..
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