CAJ | 학술논문

分别采用均匀沉淀法、沉淀法和浸渍法制备了Ni/Al_2O_3催化剂,在常压固定床反应器中评价了Ni/Al_2O_3催化剂在乙醇水蒸气重整制氢反应中的性能;采用X射线衍射和低温N_2物理吸附法对Al_2O_3载体和Ni/Al_2O_3催化剂进行了表征;考察了载体焙烧温度及时间、催化剂制备方法、Ni负载量和催化剂还原时间等制备条件对Ni/Al_2O_3催化剂性能的影响.实验结果表明,以600 ℃下焙烧2 h的Al_2O_3为载体、采用浸渍法负载质量分数10.0%的Ni、在500 ℃焙烧1 h且在650 ℃下还原1 h的Ni/Al_2O_3催化剂的活性和选择性最好.在500 ℃、重时空速9.6 h~(-1)、水与乙醇的摩尔比为3:1的反应条件下,乙醇转化率达100%,产气速率为83.0 mL/min,H_2选择性为63.6%.
분별채용균균침정법、침정법화침지법제비료Ni/Al_2O_3최화제,재상압고정상반응기중평개료Ni/Al_2O_3최화제재을순수증기중정제경반응중적성능;채용X사선연사화저온N_2물리흡부법대Al_2O_3재체화Ni/Al_2O_3최화제진행료표정;고찰료재체배소온도급시간、최화제제비방법、Ni부재량화최화제환원시간등제비조건대Ni/Al_2O_3최화제성능적영향.실험결과표명,이600 ℃하배소2 h적Al_2O_3위재체、채용침지법부재질량분수10.0%적Ni、재500 ℃배소1 h차재650 ℃하환원1 h적Ni/Al_2O_3최화제적활성화선택성최호.재500 ℃、중시공속9.6 h~(-1)、수여을순적마이비위3:1적반응조건하,을순전화솔체100%,산기속솔위83.0 mL/min,H_2선택성위63.6%.
Ni/Al_2O_3 catalysts were prepared separately by homogeneous precipitation, precipitation and impregnation. Hydrogen production from steam reforming of ethanol over Ni/Al_2O_3 catalyst was studied in a fixed bed reactor. The structures and surface characteristics of Al_2O_3 support and Ni/Al_2O_3 catalyst were determined by means of XRD and N_2 physical adsorption. Influences of calcination temperature and time of support, Ni loading,preparation method and reduction conditions of Ni/Al_2O_3 on catalyst activity were investigated. The preferable preparation conditions were as follows:Al_2O_3 support was calcined at 600 ℃ for 2 h, Ni/Al_2O_3 catalyst with Ni loading of 10.0%(mass fraction, based on Al_2O_3 support) was prepared by impregnation and calcination at 500 ℃ for 1 h, and then reduced by H_2 at 650 ℃ for 1 h. Under the conditions: reaction temperature 500 ℃, mole ratio of water to ethanol 3:1 and WHSV 9.6 h~(-1), selectivity to H_2 was 63.6%, output of gas was 83.0 mL/min and ethanol conversed completely.