Oxidative steam reforming of HDPE pyrolysis volatiles on Ni catalysts:Effect of the support(Al_(2)O_(3),ZrO_(2),SiO_(2))and promoter(CeO_(2),La_(2)O_(3))on the catalyst performance  

镍催化剂上HDPE热解挥发物的氧化蒸汽重整:奉载体和助剂的影响

作　　者：Mayra Alejandra Suarez Laura Santamaria Gartzen Lopez Enara Fernandez Martin Olazar Maider Amutio Maite Artetxe Mayra Alejandra Suarez;Laura Santamaria;Gartzen Lopez;Enara Fernandez;Martin Olazar;Maider Amutio;Maite Artetxea(巴斯克地区大学化学工程系,西班牙毕尔巴鄂;巴斯克科学基金会,西班牙毕尔巴鄂)

机构地区：[1]Department of Chemical Engineering,University of the Basque Country UPV/EHU,P.O.Box 644-E48080 Bilbao,Spain [2]IKERBASQUE,Basque Foundation for Science,Bilbao,Spain

出　　处：《Chinese Journal of Catalysis》2025年第2期149-162,共14页催化学报(英文)

摘　　要：High density polyethylene(HDPE)pyrolysis and in-line oxidative steam reforming was carried out in a two-step reaction system consisting of a conical spouted bed reactor and a fluidized bed reactor.Continuous plastic pyrolysis was conducted at 550℃ and the volatiles formed were fed in-line to the oxidative steam reforming step(space-time 3.12 gcat min gHDPE−1;ER=0.2 and steam/plastic=3)operating at 700℃.The influence Ni based reforming catalyst support(Al_(2)O_(3),ZrO_(2),SiO_(2))and promoter(CeO_(2),La_(2)O_(3))have on HDPE pyrolysis volatiles conversion and H_(2) production was assessed.The catalysts were prepared by the wet impregnation and they were characterized by means of N_(2) adsorption-desorption,X-ray fluorescence,temperature-programmed reduction and X-ray powder diffraction.A preliminary study on coke deposition and the deterioration of catalysts properties was carried out,by analyzing the tested catalysts through temperature programmed oxidation of coke,transmission electron microscopy,and N_(2) adsorption-desorption.Among the supports tested,ZrO_(2) showed the best performance,attaining conversion and H_(2) production values of 92.2% and 12.8 wt%,respectively.Concerning promoted catalysts,they led to similar conversion values(around 90%),but significant differences were observed in H_(2) production.Thus,higher H_(2) productions were obtained on the Ni/La_(2)O_(3)-Al_(2)O_(3) catalyst(12.1 wt%)than on CeO_(2) promoted catalysts due to La_(2)O_(3) capability for enhancing water adsorption on the catalyst surface.在由锥形喷射床反应器和流化床反应器组成的两步反应体系中进行了高密度聚乙烯(HDPE)热解和在线氧化蒸汽重整(P-OSR)反应。将550C连续塑料热解形成的挥发物在线送入700℃的氧化蒸汽重整步骤(时空3.12g-cat min g-HDPE^(-)当量比=0.2,蒸汽/塑料比(S/P)=3).考察了镍基重整催化剂载体(Al_(2)O_(3),ZrO_(2)和SiO_(2))和助剂(CeO_(2)和La_(2)O)对HDPE热解挥发物转化和生成H_(2)的影响.采用湿浸渍法制备催化剂,并通过N,吸附-解吸、X射线荧光、程序升温还原和X射线粉末衍射对其进行了表征通过焦炭程序升温氧化、透射电镜和氮气吸附-解吸对催化剂上积炭及其失活性能进行了初步研究.所考察的载体中以ZrO2的性能最佳,转化率和H2产量分别为92.2%和12.8wt%.虽然添加了二种助剂的催化剂上转化率接近(约90%),但产氢性能差异显著.由于La_(2)O,能够增强催化剂表面上水的吸附,因此Ni/La_(2)O_(3)-Al_(2)O_(3)催化剂上产氢量(12.1 Wt%)高于CeO_(2)促进催化剂的.

关 键 词：PLASTIC PYROLYSIS Oxidative steam reforming Ni catalyst Hydrogen 

分 类 号：TQ426.94[化学工程]