化工进展 ›› 2020, Vol. 39 ›› Issue (4): 1357-1362.DOI: 10.16085/j.issn.1000-6613.2019-0933

• 工业催化 • 上一篇    下一篇

Ni-CeO2-K/γ-Al2O3催化剂上沼气联合重整制合成气

盖希坤1,2(),杨丹1,2,吕鹏1,2,邢闯1,2,吕成学1,2,杨瑞芹1,2   

  1. 1.浙江科技学院生物与化学工程学院,浙江 杭州 310023
    2.浙江省农产品化学与生物加工技术重点实验室,浙江 杭州 310023
  • 收稿日期:2019-06-10 出版日期:2020-04-05 发布日期:2020-04-28
  • 通讯作者: 盖希坤
  • 作者简介:盖希坤(1982—),男,博士,副教授,硕士生导师,研究方向为生物质能利用。E-mail:gaixikun@163.com
  • 基金资助:
    浙江省自然科学基金一般项目(LY2017B060002);浙江科技学院交叉预研项目(2015JC05Y);浙江科技学院科研成果奖培育项目(2019JL09)

Mixed-reforming of biogas to syngas over the Ni-CeO2-K/γ-Al2O3 catalyst

Xikun GAI1,2(),Dan YANG1,2,Peng LÜ1,2,Chuang XING1,2,Chengxue LÜ1,2,Ruiqin YANG1,2   

  1. 1.College of Biological and Chemical Engineering, Zhejiang University of Science and Technology, Hangzhou 310023, Zhejiang, China
    2.Zhejiang Provincial Key Lab for Chem & Bio Processing Technology of Farm Product, Hangzhou 310023, Zhejiang, China
  • Received:2019-06-10 Online:2020-04-05 Published:2020-04-28
  • Contact: Xikun GAI

摘要:

采用超声波辅助等体积浸渍法制备Ni-CeO2-K/γ-Al2O3催化剂用于沼气联合重整反应,采用 BET、XRD、TG/DTG等技术对催化剂性质进行了表征,在微型固定床反应装置中研究了反应温度、体积空速、原料气组成等对沼气联合重整反应特性的影响,并对催化剂的稳定性进行了研究。结果表明,助剂CeO2的加入,提高了催化剂中Ni的分散度,降低了催化剂还原温度。升高反应温度和减小体积空速,能够提高沼气中CH4和CO2的转化率;原料气中加入水蒸气,能够明显提高H2/CO体积比;加入的O2容易与H2、CO发生反应,CH4转化率稍有提高。在常压、反应温度850℃、体积空速为100000h-1、摩尔比CH4∶CO2∶H2O∶O2∶Ar=1∶0.5∶0.5∶0.1∶0.01的优化条件下,沼气中CH4转化率超过95%,CO2转化率超过75%,生成合成气H2/CO体积比约为1.6,反应48h后,催化剂未见积炭,保持稳定的活性。与沼气干重整相比,沼气联合重整不利于沼气中CO2的转化。

关键词: 沼气, 重整, Ni基, 催化剂, 固定床, 合成气

Abstract:

The Ni-CeO2-K/γ-Al2O3 catalyst used for biogas reforming reaction was prepared by the ultrasonic assisted incipient wetness impregnation method. The catalyst was characterized by BET, XRD and TG/DTG techniques. In addition, the effects of reaction temperature, space velocity, composition on the raw gas to biogas mixed reforming reaction were studied in a micro fixed-bed reactor. The results showed that the addition of CeO2 increased the dispersion of Ni in the catalyst, and decreased the reduction temperature. The conversion of CH4 and CO2 in biogas could be improved by increasing the reaction temperature and reducing the gas space velocity. The addition of water vapor to the raw gas could significantly increase H2/CO so that the added O2 reacted easily with H2 and CO, and the CH4 conversion rate was slightly improved. The CH4 conversion was over 95%, the CO2 conversion was more than 75%, and the ratio of H2/CO of the generated syngas was about 1.6 in conditions of normal pressure, reaction temperature of 850℃, volume space velocity of 100000h-1, and CH4∶CO2∶H2O∶O2∶Ar=1∶0.5∶0.5∶0.1∶0.01. There was no obvious carbon deposition on the catalyst after continuous reaction over 48h, and the activity remained stable. Compared with the dry reforming of methane, the mixed-reforming of biogas is not conducive to the transformation of CO2.

Key words: biogas, reforming, Ni based, catalyst, fixed-bed, syngas

中图分类号: 

京ICP备12046843号-2;京公网安备 11010102001994号
版权所有 © 《化工进展》编辑部
地址:北京市东城区青年湖南街13号 邮编:100011
电子信箱:hgjz@cip.com.cn
本系统由北京玛格泰克科技发展有限公司设计开发 技术支持:support@magtech.com.cn