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首页> 外文期刊>Catalysis science & technology >Direct conversion of syngas to dimethyl ether as a green fuel over ultrasound-assisted synthesized CuO-ZnO-Al2O3/HZSM-5 nanocatalyst: effect of active phase ratio on physicochemical and catalytic properties at different process conditions
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Direct conversion of syngas to dimethyl ether as a green fuel over ultrasound-assisted synthesized CuO-ZnO-Al2O3/HZSM-5 nanocatalyst: effect of active phase ratio on physicochemical and catalytic properties at different process conditions

机译：在超声辅助合成的Cuo-Zno-Al2O3/Hzsm-5纳米催化剂上，合成剂直接转化为二甲基醚作为绿色燃料：活动相比对不同过程条件下物理化学和催化特性的影响

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The effect of active phase (CZA: CuO-ZnO-Al2O3) to support (HZSM-5) ratio on the physicochemical and catalytic properties of CuO-ZnO-Al2O3/HZSM-5 nanocatalyst for direct conversion of syngas to DME (STP) has been investigated. Nanocatalysts were synthesized using a hybrid co-precipitation-ultrasound method in three ratios of CZA/HZSM-5 = 2, 3 and 4. The surface functional groups, phase evolution, morphology, reducibility and surface area of calcined nanocatalyst were investigated using FTIR, XRD, FESEM, PSD, EDX, H2-TPR and BET techniques. It was found that with varying of the CZA content, the physico-chemical properties of prepared nanocatalysts changed obviously. The analysis showed that applying ultrasound energy led to uniform coating of the HZSM-5 surface by CuO-ZnO-Al2O3. Moreover, it was found that each catalyst consisted of many small particles whose shapes are almost spherical. H2-TPR profiles indicated that reducibility of nanocatalysts was increased with enhancement of CZA ratio. The effect of CZA/HZSM-5 ratio on the catalytic performance was investigated at 200-300 °C, 10-40 bar, GHSV = 600 to 1500 cm~3 g h~(-1) and H2/CO = 2. The results showed that the CZA content has great influence on the activity of nanocatalysts and the sample with CZA/HZSM-5 = 4 showed highest catalytic activity. Furthermore, it was observed that the optimum operating condition for STD reaction is 275 °C and 40 bar. The durability of the nanocatalyst was investigated during syngas to DME conversion. The nanocatalyst loses negligible activity over the course of the reaction.
机译：活性相（CZA：CU-ZNO-AL2O3）对支持（HZSM-5）比对Cuo-Zno-Al2O3/HzSM-5纳米催化剂的物理化学和催化特性的影响（HZSM-5）的影响被调查。使用杂种共催化剂使用三种比例的CZA/HZSM-5 = 2、3和4合成纳米催化剂。 XRD，FESEM，PSD，EDX，H2-TPR和BET技术。发现随着CZA含量的不同，制备的纳米催化剂的物理化学特性显然发生了变化。分析表明，应用超声能通过Cu-Zno-Al2O3导致HZSM-5表面均匀涂层。此外，发现每个催化剂由许多小颗粒组成，其形状几乎是球形的。 H2-TPR轮廓表明，随着CZA比的增强，纳米催化剂的降低性增加。在200-300°C，10-40 bar，GHSV = 600至1500 cm〜3 g H〜（-1）和H2/CO = 2时，研究了CZA/HZSM-5比对催化性能的影响。结果。结果表明CZA含量对纳米催化剂的活性和CZA/HZSM-5 = 4的样品具有很大的影响，显示出最高的催化活性。此外，观察到，性病反应的最佳工作条件为275°C和40 bar。在合成剂与DME转换期间研究了纳米催化剂的耐用性。纳米催化剂在反应过程中失去可忽略的活性。

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