Reaction Kinetics, Mechanisms and Catalysis ( IF 1.7 ) Pub Date : 2021-07-27 , DOI: 10.1007/s11144-021-02037-1 Evgeniya A. Martynenko 1 , Sergei V. Vostrikov 1 , Aleksey A. Pimerzin 1
|
Decalin dehydrogenation for efficient hydrogen production over platinum catalysts supported on different types of silica was studied. The catalytic properties of the prepared catalysts were tested under conditions of a flow installation. It was found that from a thermodynamic point of view, high temperatures will favor dehydrogenation, and low temperatures will favor the isomerization of cis-decalin to trans-decalin. It negatively affects the rate of decalin dehydrogenation; therefore, kinetic control is required. It was shown that the catalysts supported on mesoporous silica MCM-48 and SBA-15 showed a significantly higher catalytic activity during decalin dehydrogenation compared to catalysts supported on amorphous SiO2. The high surface area and small pore size of these supports positively affect Pt particles’ dispersion and result in the production of high-active catalysts for dehydrogenation of decalin to naphthalene. The maximum decalin conversion was observed over the 2% Pt/MCM-48 catalyst at a pressure of 0.5 MPa, a 325 °C temperature, and an LHSV of 20 h−1. This study provides a rationale for the proper support selection for efficient utilization of decalin as a LOHC.
Graphic abstract
中文翻译：
在二氧化硅负载的铂催化剂上从萘烷制氢：动力学和热力学研究
研究了在负载在不同类型二氧化硅上的铂催化剂上用于高效制氢的十氢化萘脱氢。在流动装置条件下测试制备的催化剂的催化性能。发现从热力学的角度来看，高温有利于脱氢，而低温有利于顺式萘烷异构化为反式萘烷。它对十氢化萘脱氢速率有负面影响；因此，需要动力学控制。结果表明，与负载在无定形 SiO 2上的催化剂相比，负载在介孔二氧化硅 MCM-48 和 SBA-15 上的催化剂在十氢化萘脱氢过程中表现出显着更高的催化活性. 这些载体的高表面积和小孔径对 Pt 颗粒的分散有积极影响，并导致生产用于将十氢化萘脱氢为萘的高活性催化剂。在 0.5 MPa 的压力、325°C 的温度和 20 h -1的 LHSV 下，在 2% Pt/MCM-48 催化剂上观察到最大十氢化萘转化率。该研究为有效利用十氢化萘作为 LOHC 的正确支持选择提供了基本原理。
京公网安备 11010802027423号