Effect of activated carbon pore size distribution on low-mercury catalyst performance for acetylene hydrochlorination

doi:10.11949/j.issn.0438-1157.20170982

Abstract

Abstract:

Activated carbon carriers with various pore size distributions were prepared by using pulverized coal as carbon source, dibasic sodium phosphate and potassium phosphate monobasic as adjuvant. The activated carbon carrier and catalyst were characterized by nitrogen adsorption and desorption, methylene blue adsorption, X-ray diffraction (XRD) and scanning electron microscopy (SEM). The effect of pore size distribution on catalyst performance was studied in an isothermal fixed-bed reactor, which simulated industry-scale single tubular conversion unit. The results showed that activated carbon of different specific surface area and pore size distribution can be prepared by adjusting amount of dibasic sodium phosphate, potassium phosphate monobasic and steam. Activated carbon with mesoporosity was obtained to 81%. Activated carbon carrier with high mesopores is beneficial to dispersion of active center, and the corresponding catalyst has excellent stabilized activity and long lifetime at high air velocity.

Key words: steam activation, pore size distribution, low-mercury catalyst, mesoporous activated carbon

摘要：

以煤粉为碳源，加入磷酸氢二钠、磷酸二氢钾为辅助剂，通过水蒸气活化的方法制备了具有不同孔径结构分布的活性炭载体。利用氮气吸脱附曲线、亚甲基蓝吸附曲线、X射线衍射（XRD）及扫描电子显微镜（SEM）分析技术对活性炭载体和催化剂进行表征。在等温固定床反应器中模拟实际生产转换器单管装置，考察了不同孔径分布的载体对催化剂催化性能的影响。结果表明：调节不同的磷酸氢二钠、磷酸二氢钾配比量和活化蒸汽量，可以制得不同比表面积和孔径分布活性炭载体，中孔率可达81%；高中孔含量的催化剂载体有利于活性中心的分散，且由其制备的催化剂在高空速下活性稳定性更好，寿命更长。

关键词: 水蒸气活化, 孔径分布, 低固汞催化剂, 中孔活性炭

CLC Number:

TQ124.4⁺2

JIANG Luo, CHEN Biaohua, ZHANG Jirui, FU Jiquan. Effect of activated carbon pore size distribution on low-mercury catalyst performance for acetylene hydrochlorination[J]. CIESC Journal, 2018, 69(1): 423-428.

江罗, 陈标华, 张吉瑞, 傅吉全. 活性炭孔径分布对乙炔氢氯化低固汞催化剂性能的影响[J]. 化工学报, 2018, 69(1): 423-428.

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