摘要
采用共沉淀法制备了Cu-Fe催化剂,用XRD、XPS、TPR和BET等研究了老化时间对催化剂前驱体和催化剂性能的影响。采用固定床加压微反装置,在5.0 MPa、250℃和空速5 000 h-1条件下评价催化剂合成低碳醇的催化活性。XRD研究表明,老化时间对催化剂前驱体的组成和结构以及催化剂中CuO和Fe2O3的分散度有影响;XPS和TPR研究表明,催化剂中CuO和Fe2O3间存在相互作用,强度随老化时间的延长而改变。催化活性受催化剂比表面积和Cu-Fe间相互作用强度的影响;选择性主要受Cu-Fe间相互作用强度影响。高级醇C3+OH的选择性随着老化时间的延长而增大,总醇中C2+OH选择性大于75%。
Cu-Fe catalysts were made by co-precipitation method and the influence of aging time on the properties of the precursors and catalysts was investigated by using XRD,XPS,TPR and BET. The catalytic activity of the catalysts for higher alcohols synthesis was evaluated in a pressurized fixed-bed flow reactor under the condition of 5.0 MPa,250 ℃ and space velocity 5 000 h^-1. The results of XRD characterization demonstrated that the aging time had effect on the composition and the structure of the precursor and the dispersion of CuO and Fe2O3 in the catalysts. The results of XPS and TPR characterization illustrated that there was the interaction between CuO and Fe2O3 in the samples and its strength varied with the prolon- ging of aging time. The catalytic activity was affected by the surface area and the interaction of Cu-Fe of the catalyst, while the selectivity was mainly affected by the interaction strength of Cu-Fe. The selectivity to higher alcohols Ca ＋ OH was enhanced with increase of aging time and the selectivity to C2 ＋ OH in the total alcohols was more than 75 % for all the samples.
出处
《工业催化》
CAS
2013年第7期39-44,共6页
Industrial Catalysis
基金
山东省科学发展计划(2012G0020224)资助项目
