Dimethyl Ether Synthesis from CO 2 Hydrogenation on a CuO−ZnO−Al 2 O 3 −ZrO 2 /HZSM-5 Bifunctional Catalyst
Dimethyl Ether Synthesis from CO 2 Hydrogenation on a CuO−ZnO−Al 2 O 3 −ZrO 2 /HZSM-5 Bifunctional Catalyst
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DOI：
10.1021/ie800777t
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发表时间：
2008-07
影响因子：
4.2
通讯作者：
Xin An;Yizan Zuo;Qiang Zhang;Dezheng Wang;Jin-fu Wang
中科院分区：
文献类型：
--
作者：
Xin An;Yizan Zuo;Qiang Zhang;Dezheng Wang;Jin-fu Wang
将具有高二甲醚合成活性的CuO-ZnO-Al 2 O3-ZrO 2 + HZSM-5物理混合物双功能催化剂用于CO2加氢反应。考察了反应温度、压力、空速等因素对催化剂活性的影响。在523 K，5 MPa，空速6000 mL/（g cat·h），H2/CO2 = 3的条件下，CO2转化率达到0.309，DME和甲醇收率分别为0.212和0.059。分别采用甲醇合成和甲醇脱水反应的动力学模型对实验数据进行拟合，回归得到了二甲醚合成速率方程中的动力学参数。模拟的CO2加氢过程表明，CO循环可以获得更高的二甲醚产率，也将得到无CO的产品。
A CuO−ZnO−Al2O3−ZrO2 + HZSM-5 physical mixture bifunctional catalyst with a high activity for dimethy ether (DME) synthesis was used for CO2 hydrogenation. Various factors that affect catalyst activity, including the reaction temperature, pressure, and space velocity, were investigated. CO2 conversion reached 0.309, and DME and methanol yields were 0.212 and 0.059 with a stoichiometric ratio of H2 to CO2 of 3 at 523 K, 5 MPa, and a space velocity of 6000 mL/(g cat·h). Well-studied kinetic models for methanol synthesis and methanol dehydration, respectively, were used to fit the experimental data and the kinetic parameters in the rate equations for DME synthesis were obtained by regression. A simulated process for CO2 hydrogenation indicated that a higher DME yield can be obtained with CO recycle that will also give a CO-free product.