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Engineering nanoscale H supply chain to accelerate methanol synthesis on ZnZrO_x.

ABSTRACT: Metal promotion is the most widely adopted strategy for enhancing the hydrogenation functionality of an oxide catalyst. Typically, metal nanoparticles or dopants are located directly on the catalyst surface to create interfacial synergy with active sites on the oxide, but the enhancement effect may be compromised by insufficient hydrogen delivery to these sites. Here, we introduce a strategy to promote a ZnZrO_x methanol synthesis catalyst by incorporating hydrogen activation and delivery functions through optimized integration of ZnZrO_x and Pd supported on carbon nanotube (Pd/CNT). The CNT in the Pd/CNT + ZnZrO_x system delivers hydrogen activated on Pd to a broad area on the ZnZrO_x surface, with an enhancement factor of 10 compared to the conventional Pd-promoted ZnZrO_x catalyst, which only transfers hydrogen to Pd-adjacent sites. In CO₂ hydrogenation to methanol, Pd/CNT + ZnZrO_x exhibits drastically boosted activity-the highest among reported ZnZrO_x-based catalysts-and excellent stability over 600 h on stream test, showing potential for practical implementation.

SUBMITTER: Lee K

PROVIDER: S-EPMC9925737 | biostudies-literature | 2023 Feb

REPOSITORIES: biostudies-literature

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Engineering nanoscale H supply chain to accelerate methanol synthesis on ZnZrO<sub>x</sub>.

Lee Kyungho K Mendes Paulo C D PCD Jeon Hyungmin H Song Yizhen Y Dickieson Maxim Park MP Anjum Uzma U Chen Luwei L Yang Tsung-Cheng TC Yang Chia-Min CM Choi Minkee M Kozlov Sergey M SM Yan Ning N

Nature communications 20230213 1

Metal promotion is the most widely adopted strategy for enhancing the hydrogenation functionality of an oxide catalyst. Typically, metal nanoparticles or dopants are located directly on the catalyst surface to create interfacial synergy with active sites on the oxide, but the enhancement effect may be compromised by insufficient hydrogen delivery to these sites. Here, we introduce a strategy to promote a ZnZrO<sub>x</sub> methanol synthesis catalyst by incorporating hydrogen activation and deliv ...[more]

PMID: 36781851

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Project description:In this paper, we study the topological properties of the global supply chain network in terms of its degree distribution, clustering coefficient, degree-degree correlation, bow-tie structure, and community structure to test the efficient supply chain propositions proposed by E. J.S. Hearnshaw et al. The global supply chain data in the year 2017 are constructed by collecting various company data from the web site of Standard & Poor's Capital IQ platform. The in- and out-degree distributions are characterized by a power law of the form of γin = 2.42 and γout = 2.11. The clustering coefficient decays [Formula: see text] with an exponent βk = 0.46. The nodal degree-degree correlations 〈knn(k)〉 indicates the absence of assortativity. The bow-tie structure of giant weakly connected component (GWCC) reveals that the OUT component is the largest and consists 41.1% of all firms. The giant strong connected component (GSCC) is comprised of 16.4% of all firms. We observe that upstream or downstream firms are located a few steps away from the GSCC. Furthermore, we uncover the community structures of the network and characterize them according to their location and industry classification. We observe that the largest community consists of the consumer discretionary sector based mainly in the United States (US). These firms belong to the OUT component in the bow-tie structure of the global supply chain network. Finally, we confirm the validity of Hearnshaw et al.'s efficient supply chain propositions, namely Proposition S1 (short path length), Proposition S2 (power-law degree distribution), Proposition S3 (high clustering coefficient), Proposition S4 ("fit-gets-richer" growth mechanism), Proposition S5 (truncation of power-law degree distribution), and Proposition S7 (community structure with overlapping boundaries) regarding the global supply chain network. While the original propositions S1 just mentioned a short path length, we found the short path from the GSCC to IN and OUT by analyzing the bow-tie structure. Therefore, the short path length in the bow-tie structure is a conceptual addition to the original propositions of Hearnshaw.

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Engineering nanoscale H supply chain to accelerate methanol synthesis on ZnZrO_x.

Publications

Engineering nanoscale H supply chain to accelerate methanol synthesis on ZnZrO<sub>x</sub>.

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Engineering nanoscale H supply chain to accelerate methanol synthesis on ZnZrOx.

Publications

Engineering nanoscale H supply chain to accelerate methanol synthesis on ZnZrO<sub>x</sub>.

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OmicsDI is part of the ELIXIR infrastructure

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Engineering nanoscale H supply chain to accelerate methanol synthesis on ZnZrO_x.