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Effect of pH on Co‐precipitated Cu‐ZnO‐ZrO 2 Catalysts Used in CO 2 Hydrogenation: the Role of Zn‐malachite in the Precursors ▴
Author(s) -
Gao W.,
Qu G.,
Xu M,,
Chang S.,
Na W.
Publication year - 2021
Publication title -
fuel cells
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.485
H-Index - 69
eISSN - 1615-6854
pISSN - 1615-6846
DOI - 10.1002/fuce.202000032
Subject(s) - malachite , catalysis , calcination , methanol , inorganic chemistry , selectivity , chemistry , precipitation , particle size , coprecipitation , phase (matter) , nuclear chemistry , copper , organic chemistry , physics , meteorology
A series of Cu–ZnO–ZrO 2 catalysts were prepared at different pH by co‐precipitation method and tested for the synthesis of methanol by CO 2 hydrogenation. The influence of pH on the phase formation of precursor, the average Cu particle size and the interaction among different elements were discussed in detail. The activity and selectivity of the catalysts were tested for hydrogenation of carbon dioxide to methanol. When the precipitation was conducted at pH = 8.0, in addition to aurichalcite, Zn‐malachite was obviously present in the precursor and the resulting catalysts were more active. It was found that the pH exerts its effect through altering the phase composition of the precursors. The present of Zn‐malachite in the precursors facilitates the formation of more intimate interdispersion of CuO and ZnO, and the smallest Cu particle after calcination and reduction.