【Others Papers】The influence of carrier morphology and metal additives on Pd/Ga₂O₃ catalyst for the hydrogenation of CO₂ to methanol

      Researchers from the Kunming Institute of Precious Metals have published a dissertation titled " The influence of carrier morphology and metal additives on Pd/Ga₂O₃ catalyst for the hydrogenation of CO₂ to methanol”in Precious Metals.

Abstract

      Gallium nitrate (Ga(NO₃)₃·9H₂O) was used as the raw material to prepare gallium oxide (Ga₂O₃)carriers by the sol-gel method. The morphology of the carriers was designed directionally by adjusting thepH values of the reaction solution. SEM characterization indicated that short rod-shaped Ga₂O₃ was obtainedwhen pH of the reaction solution was 8, whlie spindle-shaped Ga₂O₃ was produced at a pH value of 10. Pdwas then loaded on the two different morphological carriers by using an impregnation method. HRTEMcharacterization revealed that Pd and Ga alloyed after loading, forming a stable alloy structure. The catalyticperformance of the catalysts was tested in the CO₂ hydrogenation reaction. The results showed that the shortrod-shaped Ga₂O₃ carrier was more favorable than spindle-shaped Ga₂O₃ for the CO₂ hydrogenation tomethanol. Under the reaction conditions of 2 MPa, 250 °C and a space velocity of 24 L·gcat^-1·h^-1, the methanol space-time yield was 172.06 mg·g^-1·h^-1 and the CO₂ conversion rate was 4.62% with 45.25% of the selectivity for methanol. Pt, In and Ni were, respectively, introduced into Pd/Ga₂O₃ catalyst to explore the effect of the second metal on the catalytic performance. As a result, the addition of Pt, In and Ni was unfavorable for the CO₂ hydrogenation to methanol, but facilitated the reduction of the by-products. And the reaction products were found only to be CO and CH₃OH. The present studies will provide an important reference for the subsequent optimization design of such a catalyst.

LINK：

https://kns.cnki.net/kcms2/article/abstract?v=zYSMMY9t1sePZa3ChT_4-vFq9KBLkm_godtkDvUlSqQFeDPPEJflikG_MlVKBSYxArS95GKjNDZr9k-TX4GcW6U2y-lU9GcEXW7nPcrCfMklelpbjmEWgUEZ_37Gw__sgyLNnFkTmBliPOBG2cIvCUyOxFz-kuHb_Xi4JlGmuMLsnUf3tZMnzw==&uniplatform=NZKPT&language=CHS