Low pressure conversion of CO2 to methanol over Cu/Zn/Al catalysts. The effect of Mg, Ca and Sr as basic promoters

FUEL

卷:274

Article

Previtali, D.¹  Longhi, M.²  Galli, F.³  Di Michele, A.⁴  Manenti, F.¹  Signoretto, M.⁵  Menegazzo, F.⁵  Pirola, C.² 

[1] Politecn Milan, Dipartimento Chim Mat & Ingn Chim Giulio Natta, Piazza Leonardo da Vinci 32, Milan 20133, Italy

[2] Univ Milan, Dipartimento Chim, Via Golgi 19, Milan 20133, Italy

[3] Polytech Montreal, Dept Chem Engn, CP 6079,Succ CV, Montreal, PQ H3C 3A7, Canada

[4] Univ Perugia, Dipartimento Fis & Geol, Via Pascoli 1, Perugia 06123, Italy

[5] Univ Ca Foscari Venezia, Dipartimento Sci Mol & Nanosistemi, Via Torino 155, Venice 30170, Italy

关键词: Methanol;    CZA;    Ca doped CZA;    CO2;    Low pressure;   

DOI  :  10.1016/j.fuel.2020.117804

来源: Elsevier

【 摘 要 】

Carbon dioxide concentration level is reaching a non-returning point. Carbon capture technologies are immature and short-term actions are necessary. The conversion of CO2 into methanol is a technical challenge. Commercial copper-zinc-alumina catalysts convert maximum 7% carbon dioxide in syngas at high pressures (5 MPa to 10 MPa) and moderate temperatures (473 K to 573 K) into methanol. However, there are not records on the synthesis of methanol at low pressure (P < 2.5 MPa) and without a large excess of hydrogen in the feed. Here, we tested three new catalysts prepared by co-precipitation of copper, zinc and aluminum nitrates (CZA), with strontium, magnesium or calcium as basic promoters to enhance CO2 conversion to methanol. We discussed the microstructure of the catalysts according to the supersaturation of the relative carbonates formed during the coprecipitation synthesis. Compared to the benchmark, the sample doped with Ca showed higher carbon conversion with all the feed compositions tested (syngas, synthetic biosyngas and CO2 with H-2). CZA doped with Sr is inactive in this reaction.

【 授权许可】

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