铌镧促进钨氧化锆酸性催化剂上正丁烷异构化的研究:正丁烷异构化活性

IF 0.6 Q4 CHEMISTRY, MULTIDISCIPLINARY
Zahira Mohamed Seghir, M. Djennad, R. Schomäcker, M. R. Ghezzar
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引用次数: 0

摘要

烷烃异构化对环境友好型催化剂的需求促使了对钨-氧化锆(WZ)体系的研究。本文研究了镧(La)促进的钨酸锆(LWZ)和铌(Nb)促进的钨酸锆(NWZ)催化剂的活性和选择性。研究了1% La促进WZ (1% LWZ)和1% Nb促进WZ (1% NWZ)催化剂在氢存在下的正丁烷异构化反应。采用氮气物理吸附、nh3程序升温解吸、热重分析和x射线衍射等方法对催化剂进行了表征。添加1% Nb后,催化活性和选择性显著提高。含nb催化剂(1% NWZ)的氧化还原过程发挥了核心作用,为反应物(正丁烷)的骨架重排提供了最高酸性位点(283.53µmol g−1)和合适的活化能。此外,本研究强调了吸附物质从zro2向W以及向Nb环境的转移过程的决定作用。NWZ对正丁烷的转化率(27.34%)和对正丁烷的选择性(92.34%)显著高于WZ和LWZ催化剂。实验结果表明,Nb是比La更有效的促进剂。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Study of n-Butane Isomerization on Acid Catalysts Niobium and Lanthanum Promoted Tungstated Zirconia: n-Butane Isomerization Activity
The requirement for environmentally friendly catalysts for the isomerization of alkanes has prompted research on the tung - state-zirconia (WZ) system. The present work examines the activity and selectivity of lanthanum (La) promoted tungstate-zir conia (LWZ) and niobium (Nb) promoted tungstate-zirconia (NWZ) catalysts. In this study, 1 % La promoted WZ (1 % LWZ) and 1 % Nb promoted WZ (1 % NWZ) catalysts were investigated in isomerization of n -butane in the presence of hydrogen. The studied catalysts were characterized by different methods: nitrogen physisorption, temperature programmed desorption of NH 3 , thermogravimetric analysis, and X-ray diffraction. The catalytic activity and selectivity were significantly improved by the addition of 1 % Nb. The redox process in the Nb-containing catalyst (1 % NWZ) played a central role by providing the highest acidic sites (283.53 µmol g −1 ) with appropriate activation energies for the skeletal rearrangement of the reactant ( n -butane). Furthermore, this study highlights the determining role of the transfer process of adsorbed species from ZrO 2 to W as well as to the Nb environment. The conversion of n -butane (27.34 %) and the selectivity to i -butane (92.34 %) for NWZ were signif icantly higher than WZ and LWZ catalysts. The experimental results revealed that Nb was a more effective promoter than La.
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来源期刊
自引率
28.60%
发文量
57
审稿时长
24 weeks
期刊介绍: Kemija u industriji (Chemistry in industry) is monthly journal which is being published already for almost 60 years continually and from very beginning it is a journal of chemists and chemical engineers. It is official journal of Croatian Society of Chemists and Engineers and of Croatian Chemical Society. It is edited by Croatian Society of Chemists and Engineers.
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