Solvent Free Synthesis of PdZn/TiO2 Catalysts for the Hydrogenation of CO2 to Methanol
Solvent Free Synthesis of PdZn/TiO2 Catalysts for the Hydrogenation of CO2 to Methanol
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DOI：
10.1007/s11244-018-0885-6
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发表时间：
2018-04-01
影响因子：
3.6
通讯作者：
Jones, Wilm
中科院分区：
文献类型：
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作者：
Bahruji, Hasliza;Esquius, Jonathan Ruiz;Jones, Wilm
将二氧化碳催化升级为增值化学品是化学科学领域的一个重要挑战。特别令人感兴趣的是对二氧化碳加氢为甲醇既具有活性又具有选择性的催化剂。通过无溶剂化学气相浸渍法负载在 TiO2 上的 PdZn 合金纳米颗粒被证明对该反应有效。该合成技术被证明可以最大程度地减少不利于催化剂活性的表面污染物。研究了还原热处理对 PdZn/TiO2 催化剂结构性能和催化 CO2 加氢速率的影响。还原形成的PdZn纳米颗粒在高还原温度下对颗粒烧结表现出高稳定性，平均直径为3-6 nm，产生1710 mmol kg(-1) h甲醇。高温还原处理导致 ZnTiO3 和 PdZn 的形成，并产生最高的甲醇产率。
Catalytic upgrading of CO2 to value-added chemicals is an important challenge within the chemical sciences. Of particular interest are catalysts which are both active and selective for the hydrogenation of CO2 to methanol. PdZn alloy nanoparticles supported on TiO2 via a solvent-free chemical vapour impregnation method are shown to be effective for this reaction. This synthesis technique is shown to minimise surface contaminants, which are detrimental to catalyst activity. The effect of reductive heat treatments on both structural properties of PdZn/TiO2 catalysts and rates of catalytic CO2 hydrogenation are investigated. PdZn nanoparticles formed upon reduction showed high stability towards particle sintering at high reduction temperature with average diameter of 3-6 nm to give 1710 mmol kg(-1) h of methanol. Reductive treatment at high temperature results in the formation of ZnTiO3 as well as PdZn, and gives the highest methanol yield.