TiO_(2)催化剂改性方法对光热催化麻疯树籽油制备生物燃油的影响  

Effects of TiO_(2) catalyst modification methods on preparation of bio-fuel from Jatropha oil via photothermal catalysis

作　　者：杨依婕 刘莹 张伟 刘娜 桂超 蔡正达 孙鲁闽 陈玉保[1] YANG Yijie;LIU Ying;ZHANG Wei;LIU Na;GUI Chao;CAI Zhengda;SUN Lumin;CHEN Yubao(School of Energy and Environmental Science,Yunnan Normal University,Kunming 650500,China;School of Environmental Science and Engineering,Tan Kah Kee College,Xiamen University,Zhangzhou 363105,Fujian,China;Yunnan Provincial Academy of Science and Technology,Kunming 650228,China)

机构地区：[1]云南师范大学能源与环境科学学院,昆明650500 [2]厦门大学嘉庚学院环境科学与工程学院,福建漳州363105 [3]云南省科学技术院,昆明650228

出　　处：《中国油脂》2023年第1期53-59,65,共8页China Oils and Fats

基　　金：云南省低碳发展引导专项(云财资环[2021]135号);云南省基础研究计划重点项目(2019FA004);云南中烟工业有限责任公司科技重点项目(2022GY03);云南省科技人才与平台计划(202105AC160058);云南省院士专家工作站(202205AF150024);云南省国际科技合作专项(202003AF140001);昆明市国际(对外)科技合作基地(GHJD-2020026)。

摘　　要：为改善TiO_(2)在光热催化过程中催化效率不高及回收困难等问题,分别使用固体分散法和溶胶凝胶法将TiO_(2)与HZSM-5分子筛结合,并负载活性金属Pt制备Pt/TiO_(2)-HZSM-5催化剂,对两种催化剂进行X射线衍射(XRD)、N_(2)吸附-脱附、高分辨率透射电镜(HRTEM)、紫外-可见光(UV-Vis)、X射线荧光(XRF)及吡啶-红外(Py-IR)表征,并用于光热催化麻疯树籽油加氢制备生物燃油中,考察两种改性催化剂的催化效果。结果表明:两种制备方法均可使TiO_(2)成功分散在HZSM-5分子筛表面,TiO_(2)的比表面积增加,HZSM-5分子筛孔容和孔径改变;改性后的催化剂衍射峰出现明显红移,对可见光的吸收能力提高,酸性位点增加;相比溶胶凝胶法,固体分散法制备的Pt/TiO_(2)-HZSM-5活性金属Pt分散度较好且无团聚现象,粒径更小,催化性能更优;在反应温度100℃、氢压0.4 MPa、反应时间12 h条件下,使用固体分散法制备的Pt/TiO_(2)-HZSM-5光热催化麻疯树籽油制备生物燃油的原料转化率达93.20%、C_(8)~C_(17)烷烃选择性达54.92%,该催化剂的重复利用实验结果表明,催化剂再生后C_(8)~C_(17)烷烃选择性随着再生次数的增加而下降,可再生能力有待加强。To improve the problems of low catalytic efficiency and difficult recovery of TiO_(2)in the photothermal catalysis process, the Pt/TiO_(2)-HZSM-5 catalysts were prepared by combining TiO_(2)with HZSM-5 molecular sieve using solid dispersion method and sol-gel method, respectively, and loaded with active metal Pt.The two catalysts were characterized by X-ray diffraction(XRD), N2adsorption-desorption, high-resolution transmission electron microscopy(HRTEM), ultraviolet-visible light(UV-Vis), X-ray fluorescence(XRF) and pyridine-infrared(Py-IR), and used in the photothermal catalytic hydrogenation of Jatropha oil for the preparation of bio-fuel to investigate the catalytic effects of the two modified catalysts.The results showed that TiO_(2)was successfully dispersed on the surface of the HZSM-5 molecular sieve, the specific surface area of TiO_(2)increased, and the pore volume and pore size of the HZSM-5 molecular sieve changed.The modified catalyst showed a significant red shift in the diffraction peak with improved absorption of visible light, and the acidic sites increased.Compared with sol-gel method, Pt/TiO_(2)-HZSM-5 prepared by solid dispersion method had better Pt dispersion and no agglomeration phenomenon, smaller particle size and better catalytic performance. With this catalyst, the material conversion andC_(8)-C_(17)alkanes selectivity reaching 93.20%and 54.92%respectively in the photothermal catalytic hydrogenation of Jatropha oil for the preparation of bio-fuel under the conditions of reaction temperature 100℃,H2pressure 0.4 MPa and reaction time 12 h. The results of the reuse experiments of this catalyst showed that the C_(8)-C_(17)alkanes selectivity decreased with the increase of regeneration times, and the regeneration capacity should be strengthened.

关 键 词：固体分散法 溶胶凝胶法 催化剂改性 光热催化 生物燃油 麻疯树籽油 

分 类 号：S216.2[农业科学—农业机械化工程] TQ645.1[农业科学—农业工程]