正丁烷水蒸气重整反应NiO/Si-Al催化剂制备  

Preparation of NiO/Si-Al catalysts for steam reforming of n-butane

作　　者：张钰[1] 徐绍平[1] 赵飞[2] 韩壮[1] 郭树才[1] 罗长齐[1] 

机构地区：[1]大连理工大学煤化工研究所,辽宁大连116012 [2]吉林化工学院化工系,吉林吉林132022

出　　处：《大连理工大学学报》2005年第3期330-334,共5页Journal of Dalian University of Technology

基　　金：大连市科委资助项目.

摘　　要：以开发液化石油气水蒸气重整催化剂为目的,利用沉淀法制备Si-Al系载体,并用浸渍法制备NiO/Si-Al催化剂.以正丁烷为模型化合物,在连续流动固定床反应器中考查了催化剂组成及制备方法对其性能的影响.通过XRD、TG-DTG、TEM、X荧光光谱等分析手段对催化剂进行了表征.实验结果表明,硅铝沉淀次序制备的催化剂优于铝硅沉淀次序;催化剂的焙烧温度对其活性有很大影响,773K焙烧时的催化剂活性要高于973K高温焙烧时的催化剂活性;催化剂失活的原因有催化剂积碳(片状积碳和须碳)和表面烧结而导致活性组分分散度下降.NiO/Si-Al催化剂适宜的催化剂床层温度为1023～1073K,并在水碳比为2.0的反应条件下仍保持较好的反应活性.NiO/Si-Al catalysts for liquefied petroleum gas (LPG) steam reforming were prepared by loading Ni through impregnation from nickel nitrate solutions on co-precipitated Si-Al supports. The catalytic steam reforming of n-butane was carried out in a continuous flow fixed-bed reactor to evaluate the catalysts. The conditions of supports preparation, Ni loading and the calcination temperature of the supported catalysts were investigated. XRD, TG-DTG, TEM, X-photoluminescence spectrum were used to characterize the catalysts. The self-prepared catalysts show excellent catalytic activity for n-butane steam reforming. The catalysts based on supports in Si-Al co-precipitation sequence are superior to those in Al-Si sequence. The catalysts calcined at 773 K show higher activity than those at 973 K. The deactivation of the catalysts is caused by coke formation (of both lattice and filament carbon forms) and the decrease of dispersity because of the agglomeration of the Ni crystals. The optimal reaction temperature is 1023-1073 K and the n(S)/n(C) can be as low as 2.0.

关 键 词：水蒸气重整反应 NIO 正丁烷 催化剂制备 催化剂活性 固定床反应器 重整催化剂 液化石油气 模型化合物 催化剂组成 X荧光光谱 催化剂失活 制备方法 连续流动 分析手段 焙烧温度 高温焙烧 床层温度 活性组分 反应活性 反应条件 

分 类 号：TQ511.6[化学工程] TB383[一般工业技术—材料科学与工程]