Mechanism for catalytic cracking of coal tar over fresh and reduced LaNi_(1-x)Fe_xO_3 perovskite

Cui Xin; Wu Tong; Cao Jing-Pei; Tang Wen; Yang Fei-Long; Zhu Bai-An; Wang Zheng

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Mechanism for catalytic cracking of coal tar over fresh and reduced LaNi_(1-x)Fe_xO_3 perovskite

机译：煤焦油催化破裂的机制在新鲜和减少的LANI_（1-X）FE_XO_3 PEROVSKITE

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Efficient removal of tar at gas outlet is a challenge during COREX ironmaking process. The differences between fresh and reduced LaNi1-xFexO3 pemvskite were investigated via catalytic cracking of coal tar at 700 degrees C. The total gas yield of fresh catalysts is generally higher than that of reduced ones. The reduced catalyst produced more tar and carbon deposition. While the fresh LaNi0.8Fe0.2O3 gave the highest total gas yield (34.8 mmol/g(coal)) and H-2 yield (20.9 mmol/g(coal)) p, and the lowest tar production (0.05%) and carbon deposition (10.9%). The pemvskite structure was destroyed after reduction and the metal in pemvskite was reduced to load on the catalyst surface. Partial oxidation which produces CO and H-2 mainly occurs in the catalysis of reduced perovskite. Complete oxidation which generates CO2 and water is the major catalytic route for fresh perovskite. Oxygen in pemvskite will transfer from the bulk to the surface. Water in the product supplements oxygen for the perovskite to construct an oxygen transition cycle which can maintain the catalyst activity. Tar is decomposed by the oxygen in fresh perovskite structure. The high nickel content in perovskite could promote the oxidation of tar.

机译：高效除去在气体出口时焦油是核心炼铁过程中的挑战。通过在700℃下通过煤焦油的催化裂化研究了新鲜和减少的Lani1-Xfexo3Pemvskite之间的差异。新鲜催化剂的总气体产率通常高于降低的气体产率。降低的催化剂产生了更多的焦油和碳沉积。新鲜的Lani0.8Fe0.2O3获得最高的总煤矿产量（34.8mmol / g（煤））和H-2产率（20.9mmol / g（煤））p，并且焦油产量最低（0.05％）和碳沉积（10.9％）。在还原后破坏了Pemvskite结构，并将蛋白质中的金属降低到催化剂表面上的负荷。产生CO和H-2的部分氧化主要发生在钙钛矿的催化中。产生CO 2和水的完全氧化是新鲜钙钛矿的主要催化途径。 Pemvskite中的氧气将从散装转移到表面。产品中的水用于钙钛矿的氧气，以构建可维持催化剂活性的氧过渡循环。焦油由新鲜钙钛矿结构中的氧分解。钙钛矿的高镍含量可以促进焦油的氧化。

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来源
《Fuel》 |2021年第15期|119683.1-119683.10|共10页
作者
Cui Xin; Wu Tong; Cao Jing-Pei; Tang Wen; Yang Fei-Long; Zhu Bai-An; Wang Zheng;
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作者单位

China Univ Min & Technol Sch Elect & Power Engn Xuzhou 221116 Jiangsu Peoples R China;

China Univ Min & Technol Sch Elect & Power Engn Xuzhou 221116 Jiangsu Peoples R China;

China Univ Min & Technol Key Lab Coal Proc & Efficient Utilizat Minist Educ Xuzhou 221116 Jiangsu Peoples R China;

China Univ Min & Technol Key Lab Coal Proc & Efficient Utilizat Minist Educ Xuzhou 221116 Jiangsu Peoples R China;

China Univ Min & Technol Key Lab Coal Proc & Efficient Utilizat Minist Educ Xuzhou 221116 Jiangsu Peoples R China;

China Univ Min & Technol Sch Elect & Power Engn Xuzhou 221116 Jiangsu Peoples R China;

China Univ Min & Technol Sch Elect & Power Engn Xuzhou 221116 Jiangsu Peoples R China;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种 eng
中图分类
关键词
LaNi1-xFexO3 perovskite; Coal tar cracking; Catalyst state; Catalytic mechanism;

机译：LANI1-XFEXO3 PEROVSKITE;煤焦油裂解;催化剂状态;催化机制;

Mechanism for catalytic cracking of coal tar over fresh and reduced LaNi_(1-x)Fe_xO_3 perovskite

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