CO2 to Value-Added Chemicals: Synthesis and Performance of Mono- and Bimetallic Nickel–Cobalt Nanofiber Catalysts
CO2 to Value-Added Chemicals: Synthesis and Performance of Mono- and Bimetallic Nickel–Cobalt Nanofiber Catalysts
复制标题
DOI：
10.3390/catal13061017
复制
发表时间：
2023-06
期刊：
影响因子：
3.9
通讯作者：
John Schossig;Akash Gandotra;Kevin Arizapana;Daniel Jochen Weber;Michael Wildy;Wanying Wei;Kai Xu;L. Yu;R. Chimenti;Islam M. Mantawy;D. Hyun;Wenshuai Chen;Cheng Zhang;Ping Lu
中科院分区：
文献类型：
--
作者：
John Schossig;Akash Gandotra;Kevin Arizapana;Daniel Jochen Weber;Michael Wildy;Wanying Wei;Kai Xu;L. Yu;R. Chimenti;Islam M. Mantawy;D. Hyun;Wenshuai Chen;Cheng Zhang;Ping Lu
在一个对气候变化的担忧不断升级和能源危机迫在眉睫的时代，设计能够促进二氧化碳(CO2)的封存和转化为有益化学品的高效催化剂是至关重要的。本研究通过一种简单的电纺丝技术，通过精确控制Ni/Co的摩尔比，成功地合成了单金属镍(Ni)和钴(Co)及其双金属混合物NiCo纳米纤维催化剂。应用扫描电子显微镜、热重分析、红外光谱、X射线衍射、拉曼光谱、X射线荧光光谱和电感耦合等离子体质谱等一系列先进的分析手段，验证了活性镍/钴催化剂在纳米纤维中的有效整合和均匀分布。系统考察了这些单金属和双金属Ni/Co纳米纤维催化剂在常压条件下对CO2加氢反应的催化性能。Ni/Co摩尔比为1：2的双金属NiO纳米纤维催化剂，经1050℃热处理后，CO选择性高(98.5%)，CO2转化率显著提高，分别是单金属Ni纳米纤维催化剂的16.7倍和单金属Co纳米纤维催化剂的10.8倍。催化性能的显著提高归功于活性中心可及性的改善、颗粒尺寸的最小化以及这些纳米纤维结构中强烈的Ni-Co-C相互作用。这些纳米纤维催化剂提供了一个独特的模型系统，阐明了负载型催化的基本方面，并强调了其在应对紧迫的环境挑战方面的关键作用。
In an epoch dominated by escalating concerns over climate change and looming energy crises, the imperative to design highly efficient catalysts that can facilitate the sequestration and transformation of carbon dioxide (CO2) into beneficial chemicals is paramount. This research presents the successful synthesis of nanofiber catalysts, incorporating monometallic nickel (Ni) and cobalt (Co) and their bimetallic blend, NiCo, via a facile electrospinning technique, with precise control over the Ni/Co molar ratios. Application of an array of advanced analytical methods, including SEM, TGA–DSC, FTIR-ATR, XRD, Raman, XRF, and ICP-MS, validated the effective integration and homogeneous distribution of active Ni/Co catalysts within the nanofibers. The catalytic performance of these mono- and bimetallic Ni/Co nanofiber catalysts was systematically examined under ambient pressure conditions for CO2 hydrogenation reactions. The bimetallic NiCo nanofiber catalysts, specifically with a Ni/Co molar ratio of 1:2, and thermally treated at 1050 °C, demonstrated a high CO selectivity (98.5%) and a marked increase in CO2 conversion rate—up to 16.7 times that of monometallic Ni nanofiber catalyst and 10.8 times that of the monometallic Co nanofiber catalyst. This significant enhancement in catalytic performance is attributed to the improved accessibility of active sites, minimized particle size, and the strong Ni–Co–C interactions within these nanofiber structures. These nanofiber catalysts offer a unique model system that illuminates the fundamental aspects of supported catalysis and accentuates its crucial role in addressing pressing environmental challenges.