Topologically immobilized catalysis centre for long-term stable carbon dioxide reforming of methane. Issue 13 (27th February 2019)

• Record Type: Journal Article
• Authors: Shoji, Shusaku; Peng, Xiaobo; Imai, Tsubasa; Murphin Kumar, Paskalis Sahaya; Higuchi, Kimitaka; Yamamoto, Yuta; Tokunaga, Tomoharu; Arai, Shigeo; Ueda, Shigenori; Hashimoto, Ayako; Tsubaki, Noritatsu; Miyauchi, Masahiro; Fujita, Takeshi; Abe, Hideki
• Is Part Of: Chemical science. Volume 10:Issue 13(2019)
• Page Start: 3701
• Page End: 3705
• Publication Date: 2019-02-27
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c8sc04965c
• Languages: English
• ISSNs: 2041-6520

Abstract

Abstract : A rooted catalyst, Ni#Y2 O3, successfully inhibits the growth of carbon nanotubes in DRM. Abstract : Methane reforming at low temperatures is of growing importance to mitigate the environmental impact of the production of synthesis gas, but it suffers from short catalyst lifetimes due to the severe deposition of carbon byproducts. Herein, we introduce a new class of topology-tailored catalyst in which tens-of-nanometer-thick fibrous networks of Ni metal and oxygen-deficient Y2 O3 are entangled with each other to form a rooted structure, i.e., Ni#Y2 O3 . We demonstrate that the rooted Ni#Y2 O3 catalyst stably promotes the carbon-dioxide reforming of methane at 723 K for over 1000 h, where the performance of traditional supported catalysts such as Ni/Y2 O3 diminishes within 100 h due to the precluded mass transport by accumulated carbon byproducts. In situ TEM demonstrates that the supported Ni nanoparticles are readily detached from the support surface in the reaction atmosphere, and migrate around to result in widespread accumulation of the carbon byproducts. The long-term stable methane reforming over the rooted catalyst is ultimately attributed to the topologically immobilized Ni catalysis centre and the synergistic function of the oxygen-deficient Y2 O3 matrix, which successfully inhibits the accumulation of byproducts.