双金属Pd-Pt/HY催化剂的甲苯加氢和开环反应

IF 0.3 Q4 ENGINEERING, MULTIDISCIPLINARY UIS Ingenierias Pub Date : 2023-01-03 DOI:10.18273/revuin.v22n1-2023003
T. Romero, L. Melo, María Esparragoza, Rosarmy Ávila, A. Moronta, G. Carruyo, L. García, C. Donoso, Laura Sáenz, Carlos Yugcha-Pilamunga
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引用次数: 0

摘要

研究了用共浸渍法制备的Pd-Pt/HY双金属催化剂,其原子变化为Pd/Pd+Pt,以转化甲苯和甲基环己烷。通过BET法、脉冲法化学吸附CO、程序升温还原(H2-TPR)和程序氨热解吸(NH3TPD)对催化剂进行了表征。Pd-Pt/HY催化剂对CO和H2-TPR的化学吸附结果表明,Pd和Pt之间存在强烈的相互作用。NH3-TPD表明,金属的加入影响弱酸/强酸位点的相对分布百分比,其呈现出按酸度递减的顺序:Pd0Pt100/HY>Pd100Pt0/HY>Pd33Pt67/HY。原子组成Pd/Pd+Pt等于0.33,弱酸/强酸位点的相对分布等于2,有利于甲苯在金属位点氢化为甲基环己烷,随后通过二甲基环戊烷中间体在酸性位点进行骨架异构化,并在金属位点开环,导致正庚烷相对于异庚烷的形成增加。研究了用共浸渍法制备的Pd-Pt/HY双金属催化剂,其原子变化为Pd/Pd+Pt,以转化甲苯和甲基环己烷。通过BET法、脉冲法化学吸附CO、程序升温还原(H2-TPR)和程序氨热解吸(NH3TPD)对催化剂进行了表征。Pd-Pt/HY催化剂对CO和H2-TPR的化学吸附结果表明,Pd和Pt之间存在强烈的相互作用。NH3-TPD表明,加入金属会影响弱酸/强酸位点的相对分布百分比,其分布顺序为:Pd0Pt100/HY>Pd100Pt0/HY>Pd33Pt67/HY。原子组成Pd/Pd+Pt等于0.33,弱酸/强酸位点的相对分布等于2,有利于甲苯在金属位点氢化为甲基环己烷,随后通过二甲基环戊烷中间体在酸性位点进行骨架异构化,并在金属位点开环,导致正庚烷相对于异庚烷的形成增加。
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Toluene hydrogenation and ring-opening on bimetallic Pd-Pt/HY catalysts
Bimetallic Pd-Pt/HY catalysts prepared by the co-impregnation method with an atomic variation of Pd/Pd+Pt were studied to convert toluene and methylcyclohexane. The catalysts were characterized by the BET method, chemisorption of CO by the pulse method, programmed temperature reduction (H2-TPR), and programmed ammonia thermo-desorption (NH3TPD). Results of chemisorption of CO and H2-TPR for Pd-Pt/HY catalysts suggest the existence of a strong interaction between Pd and Pt. The NH3-TPD showed that incorporating metals influences the percentage of relative distribution of weak/strong acid sites presented in decreasing order of acidity: Pd0Pt100/HY>Pd100Pt0/HY>Pd33Pt67/HY. Atomic composition Pd/Pd+Pt equal to 0.33, and relative distribution of weak/strong acid sites equal to 2, favor hydrogenation of toluene to methylcyclohexane in metal sites and subsequent skeletal isomerization in the acidic sites through dimethylcyclopentane intermediate and ring-opening in the metal sites, leading to increased formation of n-heptane relative to iso-heptane. Bimetallic Pd-Pt/HY catalysts prepared by the co-impregnation method with an atomic variation of Pd/Pd+Pt were studied to convert toluene and methylcyclohexane. The catalysts were characterized by the BET method, chemisorption of CO by the pulse method, programmed temperature reduction (H2-TPR), and programmed ammonia thermo-desorption (NH3TPD). Results of chemisorption of CO and H2-TPR for Pd-Pt/HY catalysts suggest the existence of a strong interaction between Pd and Pt. The NH3-TPD showed that incorporating metals influences the percentage of relative distribution of weak/strong acid sites presented in decreasing order of acidity: Pd0Pt100/HY>Pd100Pt0/HY>Pd33Pt67/HY. Atomic composition Pd/Pd+Pt equal to 0.33, and relative distribution of weak/strong acid sites equal to 2, favor hydrogenation of toluene to methylcyclohexane in metal sites and subsequent skeletal isomerization in the acidic sites through dimethylcyclopentane intermediate and ring-opening in the metal sites, leading to increased formation of n-heptane relative to iso-heptane.
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UIS Ingenierias
UIS Ingenierias ENGINEERING, MULTIDISCIPLINARY-
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33.30%
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审稿时长
12 weeks
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