メタン分解による水素と炭素生成のための析出ニッケルサイト
Exsolved nickel sites for methane decomposition to hydrogen and carbon (原題)
Song Rong Chua, Ruinan Wang, Zhihua Deng, Guoping Xiao, Jian‐Qiang Wang, Hongquan He, Xun Cao, Chee Kok Poh, Lili Zhang, Lan Zhang, Meng Ni, Siew Hwa Chan
🤖 gxceed AI 要約
日本語
ペロブスカイト型Ni-LCCM触媒を用い、メタン接触分解（CDM）によるCO2フリー水素と固体炭素の同時生成を検討した。750℃・還元前処理なしで高い炭素生産性を示し、活性は総Ni量よりも局所的なNi配置・還元性・サイトアクセス性に強く依存することがDFT計算と構造解析から示唆された。生成炭素は主にナノ結晶黒鉛質で、希硝酸処理により無機残留物を1.41〜4.20%まで低減し、高純度固体炭素回収が可能であることを実証した。
English
Ni-promoted perovskite (Ni-LCCM) catalysts were evaluated for catalytic methane decomposition (CDM) to co-produce CO2-free hydrogen and solid carbon. At 750 °C without pre-reduction, 050Ni-LCCM reached up to 11.53 gC·gNi-1, with activity governed by local Ni configuration, reducibility, and site accessibility rather than total Ni loading (supported by DFT). Mild HNO3 purification yielded graphitic carbon products with ~95.8–98.6% carbon content.
Unofficial AI-generated summary based on the public title and abstract. Not an official translation.
📝 gxceed 編集解説 — Why this matters
日本のGX文脈において
日本は水素基本戦略とGX推進法の下でCO2フリー水素供給網の構築を進めており、本論文のCDM技術は副生固体炭素の産業利用と組み合わせた水素製造オプションとして、国内の水素・素材産業の脱炭素ロードマップに資する。
In the global GX context
CDM offers a turquoise-hydrogen pathway that avoids CO2 emissions while producing saleable solid carbon, relevant to global hydrogen strategy and industrial decarbonization debates. It complements electrolysis-based green hydrogen by providing a fossil-gas-based but CO2-free route, with implications for carbon-product valorization and lifecycle accounting.
👥 読者別の含意
🔬研究者:触媒設計におけるNi配置と還元性の役割を実験とDFTで結びつけた、CDM触媒開発の基礎的知見を提供する。
🏢実務担当者:水素製造と固体炭素副産物の同時回収に関心のある素材・エネルギー企業にとって、触媒選定と生成物精製の実務的示唆を与える。
🏛政策担当者:CO2フリー水素の供給オプションとしてCDMを位置づける際の技術的根拠と、副生炭素の資源化による経済性向上の可能性を示す。
📄 Abstract（原文）
Hydrogen production via catalytic decomposition of methane (CDM) offers a CO2-free route for simultaneous hydrogen and solid carbon generation. However, practical implementation remains limited by catalyst deactivation, metal contamination in the carbon product, and inefficient post-reaction purification. In this work, Ni-promoted (La0.75Ca0.25)(Cr0.5Mn0.5)O3-δ (Ni-LCCM) perovskite catalysts prepared via a nitrate-based route were evaluated for CDM. Under thermal CDM at 750 °C without pre-reduction, 050Ni-LCCM achieved a Ni-normalized carbon productivity of up to 11.53 gC·gNi-1. A non-monotonic dependence of intrinsic carbon productivity on Ni loading was observed, with local maxima for 050Ni-LCCM and 150Ni-LCCM. These two experimental compositions were represented by the 2Ni-LCCM and 6Ni-LCCM models in the density functional theory (DFT) calculations. The 2Ni-LCCM and 6Ni-LCCM models showed lower relative rate-limiting activation barriers than those of neighboring configurations. Together with structural characterization, these results suggest that methane decomposition activity is strongly influenced by local Ni configuration, Ni reducibility, and site accessibility rather than by total Ni loading alone. Carbon characterization showed the formation of predominantly nanocrystalline graphitic carbon, including mixed carbon nanostructures such as carbon nanotubes, carbon nanofibers, and carbon nano-onions. Post-reaction purification using 5 M HNO3 reduced the residual inorganic content to 4.20% and 1.41% for carbon products from 050Ni-LCCM and 150Ni-LCCM, respectively, corresponding to thermogravimetric analysis (TGA)-based carbon contents of approximately 95.8% and 98.6%. Overall, the results demonstrate that Ni-LCCM is an effective catalyst system for CDM, in which composition-dependent Ni configurations influence intrinsic carbon productivity while enabling recovery of high-carbon-content solid products after mild acid treatment.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.20517/energymater.2026.229first seen 2026-09-25 04:45:52
🔔 こうした論文の新着を逃したくない方は キーワードアラート に登録（無料・3キーワードまで）。
gxceed は公開メタデータに基づく研究支援データセットです。要約・翻訳・解説は AI 支援で生成されています。 最終的な解釈・検証は利用者が原典資料に基づいて行うことを前提とします。