摘要
采用等体积浸渍法,通过改变浸渍顺序制备了Cr_(2)O_(3)/CuO-CeO_(2),CuO/Cr_(2)O_(3)-CeO_(2),CuO-Cr_(2)O_(3)-CeO_(2)催化剂,评价了催化剂在甲醇水蒸气重整制氢反应中的催化性能;结合XRD、N2吸附-脱附和H_(2)-TPR等表征方法,研究了Cr浸渍顺序对CuO-CeO_(2)催化剂结构及其催化性能的影响。实验结果表明,CuO晶粒粒径、Cu比表面积和还原性质主要受Cr浸渍顺序的影响;Cr_(2)O_(3)/CuO-CeO_(2)催化剂的CuO晶粒粒径较小、Cu比表面积较大、表相CuO的还原温度较低,因此具有较好的催化活性。在反应温度为260℃、水与甲醇的摩尔比为1.2、甲醇水蒸气气态空速为1760 h^(-1)的条件下,Cr_(2)O_(3)/CuO-CeO_(2)催化剂的甲醇转化率达100%,较未掺杂助剂Cr的催化剂高9.97百分点。
Cr_(2)O_(3)/CuO-CeO_(2),CuO/Cr_(2)O_(3)-CeO_(2)and CuO-Cr_(2)O_(3)-CeO_(2)catalysts were prepared by equal volume impregnation method by changing impregnation sequences.The catalysts were applied on steam reforming of methanol to hydrogen.The influence of impregnation sequences of Cr on the structural properties and catalytic performance of CuO-CeO_(2)based catalyst was investigated by XRD,N2 adsorptiondesorption and H_(2)-TPR.The results show that the impregnation sequences of Cr plays a key role on the average particle size of CuO,the specific surface area of Cu and reduction property of the catalyst.Cr_(2)O_(3)/CuO-CeO_(2)shows excellent catalytic activity in that the particle size of CuO in the catalyst is smaller,the specific surface area of Cu being larger and the reduction temperature of CuO on surface being much lower.Under the conditions of reaction temperature 260℃,mole ratio of water to methanol 1.2 and GHSV 1760 h^(-1),the conversion of methanol over Cr_(2)O_(3)/CuO-CeO_(2)catalyst is up to 100%,which is 9.97 percentage point higher than that obtained over CuO-CeO_(2)catalyst without doping of Cr.
作者
冯旭
赵瑛祁
张娜
王东哲
张磊
高志贤
Feng Xu;Zhao Yingqi;Zhang Na;Wang Dongzhe;Zhang Lei;Gao Zhixian(School of Petrochemical Engineering,Liaoning Petrochemical University,Fushun Liaoning 113001,China;Department of Chemical Engineering,Fushun Vocational and Technical College,Fushun Liaoning 113122,China)
出处
《石油化工》
CAS
CSCD
北大核心
2021年第3期205-209,共5页
Petrochemical Technology
基金
国家自然科学基金项目(21673270)
辽宁省教育厅科学研究经费项目(L2019038)
辽宁省自然科学基金面上项目(2019-MS-221)。
