CuO-Fe2O3-CeO2/HZSM-5 bifunctional catalyst Hydrogenated CO2 for enhanced dimethyl ether synthesis
CuO-Fe2O3-CeO2/HZSM-5 bifunctional catalyst Hydrogenated CO2 for enhanced dimethyl ether synthesis
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DOI：
10.1016/j.ces.2016.07.007
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发表时间：
2016-10-22
影响因子：
4.7
通讯作者：
Guo, Zhanhu
中科院分区：
文献类型：
--
作者：
Zhou, Xinhui;Su, Tongming;Guo, Zhanhu
采用均相沉淀法制备了一系列CeO 2掺杂的CuO-Fe 2 O3-CeO 2催化剂，并对其进行了表征和机械共混。评价了它们用于CO2加氢一步法合成二甲醚的可行性和性能。CeO 2改性CuO-Fe 2 O3-CeO 2催化剂后形成的稳定固溶体促进了CuO的分散，减小了CuO的晶粒尺寸，降低了高分散CuO的还原温度，改变了CuO-Fe 2 O3-CeO 2催化剂的比表面积，提高了CuO-Fe 2 O3-CeO 2催化剂的活性。CeO 2的加入增加了CuO-Fe 2 O3催化剂的刘易斯酸中心和Bronsted酸中心的数量，提高了弱酸中心的酸强度，从而提高了催化剂的CO2加氢制DME性能。确定了催化剂中Ce的最佳引入量为3wt%。在260 ℃、3.0 MPa、1500 mL·g（cat）（-1）·h（-1）的气时空速下，CO2加氢制DME的转化率为20.9%，DME选择性为63.1%。(C)2016爱思唯尔有限公司版权所有
A series of CuO-Fe2O3-CeO2 catalysts with various CeO2 doping were prepared via the homogeneous precipitation method, characterized and mechanically mixed with HZSM-5. Their feasibility and performance for the synthesis of dimethyl ether (DME) via CO2 hydrogenation in a one-step process were evaluated. The formed stable solid solution after the CuO-Fe2O3 catalyst modified with CeO2 promoted the CuO dispersion, reduced the CuO crystallite size, decreased the reduction temperature of highly dispersed CuO, modified the specific surface area of the CuO-Fe2O3-CeO2 catalyst, and improved the catalytic activity of the CuO-Fe2O3-CeO2 catalyst. The addition of CeO2 to CuO-Fe2O3 catalyst increased the amount of Lewis acid sites and Bronsted acid sites, and enhanced the acid intensity of the weak acid sites, which in turn promoted the catalytic performance of CO2 hydrogenation to DME. The optimal introduced amount of Ce in the catalyst was determined to be 3 wt%. The CO2 conversion and DME selectivity were 20.9%, and 63.1%, respectively, when the CO2 hydrogenation to DME was carried out at 260 degrees C, and 3.0 MPa with a gaseous hourly space velocity of 1500 mL.g(cat)(-1).h(-1). (C) 2016 Elsevier Ltd. All rights reserved.