Qadeer Nazish, Jabeen Naila, Khan Latif U, Sohail Manzar, Zaheer Muhammad, Vaqas Muhammad, Kanwal Afia, Sajid Fatima, Qamar Samina, Akhter Zareen
Department of Chemistry, Quaid-i-Azam University (QAU) Islamabad 45320 Pakistan
Nano Sciences and Technology Division, National Centre for Physics QAU Campus, Shahdara Valley Road, P.O. Box 2141 Islamabad 44000 Pakistan
RSC Adv. 2022 May 23;12(24):15564-15574. doi: 10.1039/d2ra01954j. eCollection 2022 May 17.
The goal of this work was to synthesize new cerium oxide-based nano-additives to minimise emissions from spark ignition (SI) engines fueled with gasoline blends, such as carbon monoxide (CO), unburned hydrocarbons (HC) and oxides of nitrogen (NO ). To investigate the effect of transition metal dopants on their respective catalytic oxidation activity, nano-sized CeO catalysts co-doped with Mn, Fe, Cu and Ag ions were successfully produced by a simple hydrothermal technique. The synthesis of nano-catalysts with cubic fluorite geometry was confirmed by XRD data. The addition of transition metal ions to the CeO lattice increased the concentration of structural defects like oxygen vacancies and Ce ions, which are advantageous for the catalytic oxidation reaction, as also supported by XAFS and RAMAN analysis. Further, nano-gasoline fuel emission parameters are measured and compared to straight gasoline fuel. The results demonstrated that harmful exhaust pollutants such as CO, HC and NO were significantly reduced. The high surface area, better redox characteristics and presence of additional oxygen vacancy sites or Ce ions have been linked to the improved catalytic performance of the synthesized catalyst.
这项工作的目标是合成新型氧化铈基纳米添加剂，以减少使用汽油混合物作为燃料的火花点火（SI）发动机的排放，如一氧化碳（CO）、未燃烧的碳氢化合物（HC）和氮氧化物（NO ）。为了研究过渡金属掺杂剂对其各自催化氧化活性的影响，通过简单的水热技术成功制备了共掺杂Mn、Fe、Cu和Ag离子的纳米CeO催化剂。XRD数据证实了具有立方萤石结构的纳米催化剂的合成。向CeO晶格中添加过渡金属离子增加了诸如氧空位和Ce离子等结构缺陷的浓度，这有利于催化氧化反应，XAFS和拉曼分析也支持了这一点。此外，测量了纳米汽油燃料的排放参数并与纯汽油燃料进行了比较。结果表明，CO、HC和NO 等有害尾气污染物显著减少。高比表面积、更好的氧化还原特性以及额外氧空位或Ce离子的存在与合成催化剂的催化性能提高有关。
