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Consequence of microwave irradiation on reforming catalysts

机译：微波辐射对重整催化剂的影响

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摘要

The aim of this paper is to point out the effects of microwave irradiation on the reforming catalysts reactivity and particularly on the selectivity in hexanes isomerization of a 0.2%Pt/AhOn3ncatalyst. The in situ thermal treatments of the catalysts and the catalytic reactions are performed in a plug-flow system working under isothermal and isobaric conditions. The catalytic bed can uniformly heated by microwave irradiation by using a magnetron and wave guide. In an other way, the catalytic bed can be heated in a classical electrical oven. Before thermal treatments, the initial step of preparation is done by impregnation of y-Aln2nOn3nwith hexachloroplatinic acid. Metal particles diameters are estimated from hydrogen chemisorption and particles distributions are obtained using electron microscopy. The catalytic tests (hexanes isomerization) either under classical heating or under microwave irradiation, are performed in such way that the total conversion is lower than 20%. When the catalyst's thermal treatment and the catalytic reactions are performed in a classical oven, the selectivity in isomers is 50%. When the thermal treatment of the catalyst and /or the reaction are performed under the electromagnetic field, the selectivity in isomers is increased to 80%. The isomer selectivity remains high even when catalysts are subsequently tested under classical heating conditions.
机译：本文的目的是指出微波辐射对重整催化剂反应性的影响，特别是对0.2％Pt / AhOn 3 ncatalyst。催化剂的原位热处理和催化反应在等温和等压条件下工作的活塞流系统中进行。可以使用磁控管和波导通过微波辐射将催化床均匀加热。以另一种方式，可以在经典的电烤箱中加热催化床。在热处理之前，准备工作的第一步是通过y-Aln 2 nOn 3n用六氯铂酸。通过氢化学吸附来估计金属粒径，并使用电子显微镜获得粒径分布。在经典加热下或在微波辐射下进行催化测试（己烷异构化），使总转化率低于20％。当在经典烘箱中进行催化剂的热处理和催化反应时，异构体的选择性为50％。当在电磁场下进行催化剂的热处理和/或反应时，异构体的选择性增加到80％。即使随后在经典加热条件下测试催化剂，异构体的选择性仍然很高。

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