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首页> 外文期刊>Applied Catalysis, A. General: An International Journal Devoted to Catalytic Science and Its Applications >Structure and activity of Ni/La_(0.7)Sr_(0.3)AlO_(3-δ) catalyst for hydrogen production by steam reforming of toluene
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Structure and activity of Ni/La_(0.7)Sr_(0.3)AlO_(3-δ) catalyst for hydrogen production by steam reforming of toluene

机译：Ni / La_（0.7）Sr_（0.3）AlO_（3-δ）催化剂的结构和活性，通过甲苯蒸汽重整制氢

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摘要

We investigated catalytic steam reforming of aromatic hydrocarbon using toluene as a model compound. Ni/La_(0.7)Sr_(0.3)AlO_(3-δ) catalyst showed high catalytic activity and low coke formation. Although the lattice oxygen in a perovski te-type support plays an important role for oxidizing CH_X and coke precursor, the role of interaction between Ni and the support has not been clarified. In this study, Ni/La_(0.7)Sr_(0.3) AlO_(3-δ) catalyst calcined at various temperatures (1073,1173,1273 and 1373 K) was prepared and used to elucidate the effect of Ni particle size on the lattice oxygen mobility. The Ni particle size increased concomitantly with increased calcination temperature, and the C1 yield decreased from 72.9 to 15.5%. Enhancement of lattice oxygen mobility by the decrease of Ni particle size was observed by transient response tests using H2~(18)O overNi/La_(0.7)Sr_(0.3)AlO_(3-δ) calcined at various temperatures. The interface between Ni and perovskite support played an important role for oxidizing coke precursor by lattice oxygen.
机译：我们研究了使用甲苯作为模型化合物的芳香烃的催化蒸汽重整。 Ni / La_（0.7）Sr_（0.3）AlO_（3-δ）催化剂具有较高的催化活性和较低的焦炭生成率。尽管钙钛矿te型载体中的晶格氧在氧化CH_X和焦炭前体方面起着重要作用，但Ni和载体之间的相互作用的作用尚不清楚。在这项研究中，制备了在各种温度（1073、1173、1273和1373 K）下煅烧的Ni / La_（0.7）Sr_（0.3）AlO_（3-δ）催化剂，并用于阐明Ni粒度对晶格的影响氧迁移率。 Ni的粒度随煅烧温度的升高而增加，而C1的产率从72.9降低到15.5％。通过在不同温度下煅烧的Ni / La_（0.7）Sr_（0.3）AlO_（3-δ）上的H2〜（18）O进行瞬态响应测试，观察到随着Ni粒径的减小，晶格氧迁移率增强。 Ni和钙钛矿载体之间的界面在通过晶格氧氧化焦炭前体中起重要作用。

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