CAJ | 학술논문

采用干混法、浸渍法、溶胶凝胶法3种制备方法制备ZrO2/SiO2,在固定床微型反应器中进行催化剂的活性评价.通过溶胶凝胶法制备的 ZrO2/SiO2 对丁二烯选择性最高,达到 64.77%.采用氨气程序升温脱附(NH3-TPD)、X 射线衍射(XRD)、透射电镜(TEM)等手段对催化剂表面酸性以及表面结构进行了表征,结果表明锆在二氧化硅表面均匀分布有利于乙醇乙醛转化率以及对1,3-丁二烯选择性的提高,同时1,3-丁二烯的生成需要合适的酸性位.以溶胶凝胶法制备的ZrO2/SiO2为催化剂,对其制备条件进行了优化,得出最佳制备条件为焙烧温度650℃、硝酸浓度2mol/L、混合温度30℃.
채용간혼법、침지법、용효응효법3충제비방법제비ZrO2/SiO2,재고정상미형반응기중진행최화제적활성평개.통과용효응효법제비적 ZrO2/SiO2 대정이희선택성최고,체도 64.77%.채용안기정서승온탈부(NH3-TPD)、X 사선연사(XRD)、투사전경(TEM)등수단대최화제표면산성이급표면결구진행료표정,결과표명고재이양화규표면균균분포유리우을순을철전화솔이급대1,3-정이희선택성적제고,동시1,3-정이희적생성수요합괄적산성위.이용효응효법제비적ZrO2/SiO2위최화제,대기제비조건진행료우화,득출최가제비조건위배소온도650℃、초산농도2mol/L、혼합온도30℃.
Three preparation methods,dry-mixed,impregnation and sol-gel methods,of ZrO2/SiO2 were introduced to study the formation of 1,3-butadiene from bioethanol and acetaldehyde. Catalyst testing device was introduced and the best selectivity of 1,3-butadiene is 64.77% which is obtained by sol-gel method. To study the quantity and quality of acid sites and surface structure of catalysts, thermogravimetry,temperature programmed desorption,X-ray diffraction and transmission electron microscopy were conducted. Zr-Si shows a high selectivity for 1,3-butadiene and corresponding reason was illustrated. NH3-TPD indicates the high intensity of strong acid sites and XRD indicates the high dispersed of ZrO2,while both attributes to the good activity of ZrO2-SiO2. The effects of preparation parameters on sol-gel Zr-Si were also investigated. The result shows that the best roasting temperature,concentration of nitric acid and temperature of agitation are 650℃,2mol/L,30℃, respectively.