A hierarchically porous carbon stabilized atomically dispersed Au catalyst for acetylene hydrochlorination,Inorganic Chemistry Frontiers

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A hierarchically porous carbon stabilized atomically dispersed Au catalyst for acetylene hydrochlorination
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2024-07-16 , DOI: 10.1039/d4qi00756e
Guojun Lan ₁ , Jinlong Zhou ₁ , Qingfeng Ye ₁ , Di Lin ₁ , Yiyang Qiu ₁ , Zaizhe Cheng ₁ , Xiucheng Sun ₁ , Ying Li ₁

Affiliation

Carbon-supported gold catalysts serve as sustainable alternatives to the toxic mercuric chloride catalyst in the industrial hydrochlorination of acetylene. The porosity and surface defects of catalytic materials have a significant impact on the performance of heterogeneous catalysts. Herein, a sheet-like carbon stabilized atomically dispersed Au catalyst (Au-CSC-850) with a hierarchically porous nanostructure and extensive surface void defects has been synthesized by a one-step pyrolysis method using cationic starch as a carbon precursor. The irregular dispersion of surface void defects within the Au-CSC-850 catalyst effectively interconnects the nanochannels and enhances the adsorption capacity for acetylene molecules. The activity of the Au-CSC-850 catalyst is significantly enhanced by the hierarchically porous structure derived from cationic starch, in comparison with that of the microporous Au-SC-850 catalyst obtained from pristine starch. The Au-CSC-850 catalyst demonstrated exceptional stability in durability tests, as evidenced by the absence of any significant activity loss over a 200-hour long-term reaction period. This work elucidates the profound influence of porous nanostructures and void defects on the catalytic activity of acetylene hydrochlorination catalysts, offering a convenient approach to fabricate highly efficient carbon supported metal catalysts.

中文翻译：

用于乙炔氢氯化的分级多孔碳稳定原子分散金催化剂

碳载金催化剂可作为乙炔工业氢氯化中有毒氯化汞催化剂的可持续替代品。催化材料的孔隙率和表面缺陷对多相催化剂的性能有显着影响。在此，利用阳离子淀粉作为碳前体，通过一步热解方法合成了一种具有分级多孔纳米结构和广泛表面空隙缺陷的片状碳稳定原子分散金催化剂（Au-CSC-850）。 Au-CSC-850催化剂内表面空隙缺陷的不规则分散有效地互连了纳米通道并增强了对乙炔分子的吸附能力。与从原始淀粉获得的微孔 Au-SC-850 催化剂相比，由阳离子淀粉衍生的分级多孔结构显着增强了 Au-CSC-850 催化剂的活性。 Au-CSC-850 催化剂在耐久性测试中表现出卓越的稳定性，在 200 小时的长期反应期内没有任何明显的活性损失就证明了这一点。这项工作阐明了多孔纳米结构和空隙缺陷对乙炔氢氯化催化剂催化活性的深远影响，为制备高效碳负载金属催化剂提供了一种便捷的方法。

更新日期：2024-07-16

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