Microemulsion solventing-out co-precipitation strategy for fabricating highly active Cu–ZnO/Al2O3 dual site catalysts for reverse water gas shift,Catalysis Science & Technology

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Microemulsion solventing-out co-precipitation strategy for fabricating highly active Cu–ZnO/Al2O3 dual site catalysts for reverse water gas shift
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2020-03-05 , DOI: 10.1039/c9cy02608h
Ziheng Zhen _{1,

2,

3,

4} , Wenxiang Tang _{1,

2,

3,

4} , Wei (Willy) Chu _{1,

2,

3,

4} , Tao Zhang _{1,

2,

3,

4} , Li Lv _{1,

2,

3,

4} , Shengwei Tang _{1,

2,

3,

4}

Affiliation

The dispersity and the neighboring degree of different sites play crucial roles in the catalytic performance of dual site catalysts. The solution of precursors was encapsulated into microdroplets by forming a microemulsion. The average diameter of microdroplets was about 45 nm. This guaranteed that the dosage of precursors was at the attogram level and only about a thousand precursor molecules were encapsulated in each microdroplet. An anti-solvent extraction method was applied to extract water from the microdroplets with acetonitrile. The precursors co-precipitated in the microdroplets due to the loss of water. The encapsulated precursors in the microdroplets co-precipitated together in nanoscale space, so the neighboring degree of the two precursors was improved significantly. The prepared catalyst was characterized by ICP-OES, BET, XRD, H₂-TPR, TEM and XPS. Compared with the Cu–ZnO/Al₂O₃ (CZA) catalysts prepared by the conventional impregnation method, the CZA catalysts prepared by the proposed strategy had much stronger interaction and a better neighboring degree of the dual active sites. They also showed very good catalytic performance for the reverse water gas shift (RWGS) reaction. The CO₂ conversion of the designed CZA catalysts was about 1–2 times higher than that of the CZA catalysts prepared by the conventional impregnation method at 0.1 MPa, 300–400 °C and a CO₂/H₂ mole ratio of 1.

中文翻译：

微乳液溶剂析出共沉淀法制备高活性Cu-ZnO / Al2O3双位催化剂用于水煤气逆向转化

不同位点的分散度和邻近程度在双位点催化剂的催化性能中起关键作用。通过形成微乳液将前体溶液封装成微滴。微滴的平均直径为约45nm。这保证了前体的剂量处于ATT水平，并且在每个微滴中仅封装了约一千个前体分子。应用了一种抗溶剂萃取方法，用乙腈从微滴中萃取水。由于失水，前体在微滴中共沉淀。微滴中封装的前体在纳米级空间中共沉淀，因此两种前体的邻近度得到了显着提高。制备的催化剂通过ICP-OES，BET，XRD，H进行表征₂ -TPR，TEM和XPS。与通过常规浸渍方法制备的Cu-ZnO / Al₂ O₃（CZA）催化剂相比，通过本发明策略制备的CZA催化剂具有更强的相互作用和更好的双活性位点邻域度。他们还显示出非常好的逆水煤气变换（RWGS）反应催化性能。设计的CZA催化剂的CO₂转化率比在0.1 MPa，300-400°C和CO₂ / H₂摩尔比为1的情况下通过常规浸渍方法制备的CZA催化剂高约1-2倍。

更新日期：2020-03-05

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