【作者】 张莉； 应翔； 徐宏；

【Author】 ZHANG Li;YING Xiang;XU Hong;East China University of Science and Technology;

【机构】 华东理工大学；

【摘要】 对于催化剂壁载型微反应器来说,制备具有高结合力、均匀的催化剂涂层至关重要。提出了不含铝的316不锈钢基体预处理新技术,在预处理表面涂覆的Al2O3催化剂载体均匀、无裂纹。超声震荡实验结果表明,涂层质量损失率为未处理板片的1/8。BET结果显示催化剂涂层具有高的比表面积,可达234m2/g。将上述催化剂制备方法应用于费托合成微反应器,实验结果表明,Co/Al2O3催化剂具有较优的选择性,反应温度220℃,压力20atm条件下,空速为10000h-1~30000h-1时,随着空速增大,CO转化率下降而C5+选择性上升,C5+选择性平均为78%左右,CH4选择性保持在10%左右。本文为低成本不锈钢基体表面制备牢固可靠的氧化铝载体开辟了新的方向,提高了催化剂壁载型微反应器商业应用潜力。更多还原

【Abstract】 In this paper, the formation of a uniform and well-adherent catalytic coating layer in the wall-coated microreactors is crucial. A new pretreatment method of aluminium-free 316 stainless steel substrate was proposed for alumina supporters. The catalyst coating on the pretreated substrate has homogeneous microstructures with no cracks. Ultrasonic vibration test results showed that the average weight loss of the coating on the pretreated substrate was only one-eighth of that on the untreated plate.The BET results show the catalyst coating has a high specific area of 234 m2/g. The Co/Al2O3 catalyst was tested for Fischer-Tropsch synthesis in the microreator. The results showed that the catalyst has good selectivity of products. CO conversion decreased when gas hourly space velocity increased from 10000h-1 to 30000h-1 at 220℃ and 20 atm. CH4 selectivity was around10% and the average of C5+ selectivity was about 78%. This study opens up a new direction towards development of wall-coated technology of Al2O3 supporter with strong adhesion on cost-effective stainless steel substrates, thus could increase the commercialization potential for wall-coated type FTS microreactors.更多还原